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‌SPECIFICATIONS

FASTENER SPECIFICATIONS

ACCESSORIES & EQUIPMENT

Cruise Control - Volt

Reusable Threaded Fastener Tightening Specifications

NOTE:

All fasteners listed in this table can be reused after removal.


Application

Specification

Metric (English)

Steering Wheel Spoke Cover Fastener

1.5 N.m (13 lb in)

SCHEMATIC WIRING DIAGRAMS

CRUISE CONTROL WIRING SCHEMATICS

Cruise Control


image

Fig. 1: Cruise Control

Courtesy of GENERAL MOTORS COMPANY

DIAGNOSTIC INFORMATION AND PROCEDURES

DTC P0571: CRUISE CONTROL BRAKE SWITCH CIRCUIT

Diagnostic Instructions


image Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. image Review Strategy Based Diagnosis for an overview of the diagnostic approach.

image Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.


DTC Descriptor


DTC P0571

Cruise Control Brake Switch Circuit

Circuit/System Description


The engine control module (ECM) monitors the brake pedal position sensor. When the brake pedal is applied, the ECM detects a predetermined voltage signal. The ECM sends a serial data message to the body control module (BCM) indicating the status of the stop lamps.

This diagnostic test functions on the assumption that a sudden decrease in vehicle speed is caused by a brake pedal application. When the ECM detects that there is a 4.2 km/h (2.6 mph) or greater decrease in vehicle speed within 0.25 s without a transition of the stop lamp switch, the ECM sets DTC P0571.

Conditions for Running the DTC


image The engine speed is greater than 700 RPM.

image The traction control system or the antilock brake system are not active and have not malfunctioned. image The vehicle speed is greater than 48 km/h (30 mph).

image The diagnostic will disable when the wheel speed is less than 16 km/h (10 mph).


Conditions for Setting the DTC


The BCM detects either a low voltage signal on the stop lamp switch signal circuit when the serial data message from the ECM indicates the brakes are applied, or a high voltage signal on the stop lamp switch signal circuit when the serial data message from the ECM indicates the brakes are not applied.

Actions Taken When the DTC Sets


image The cruise control system is disabled.

image The malfunction indicator lamp (MIL) will not illuminate.


Conditions for Clearing the DTC


image The condition responsible for setting the DTC no longer exists.

image A history DTC will clear after 40 malfunction-free ignition cycles have occurred.


Reference Information


Schematic Reference

image Cruise Control Schematics image Exterior Lights Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

image Circuit Testing

image Connector Repairs

image Testing for Intermittent Conditions and Poor Connections image Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Verify that the stop lamps operate properly and that no B22 Brake Pedal Position Sensor related DTCs are set.

image If brake pedal position sensor related DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle

image If no brake pedal position sensor related DTCs are set

2. Verify that no DTCs are set, except DTC P0571.

image If any other DTC is set, except DTC P0571

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

image If only DTC P0571 is set

3. Replace the K20 Engine Control Module.

4. Verify DTC P0571 does not set when operating the vehicle within the conditions for running the DTC.

image If the DTC sets

Replace the K9 Body Control Module.

image If the DTC does not set

5. All OK.


Repair Instructions


Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for BCM or ECM replacement, programming and setup.

DTC P0572 OR P0573: BRAKE SWITCH CIRCUIT 1 LOW/HIGH VOLTAGE

Diagnostic Instructions


image Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. image Review Strategy Based Diagnosis for an overview of the diagnostic approach.

image Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.


DTC Descriptors


DTC P0572

Brake Switch Circuit 1 Low Voltage

DTC P0573

Brake Switch Circuit 1 High Voltage

Diagnostic Fault Information



Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Stop Lamp Switch Signal

C0297, P0572

P0572

P0573

P0703

Circuit/System Description


The brake pedal position sensor signal circuit is a B+ input from the body control module (BCM) to the engine control module (ECM). The BCM and ECM monitor the brake pedal position sensor signal circuit to detect when the brake pedal has been applied. When the brake pedal is applied, the BCM supplies B+ on the stop lamp signal circuit and also sends a serial data message to the ECM indicating that the brake pedal has been applied.

Conditions for Running the DTC


image The engine is running.

image Battery voltage is greater than 11.5 V. image Brakes applied.

Conditions for Setting the DTC


P0572

This DTC will set when the ECM detects a short to ground or an open on the discrete brake signal circuit when

the serial data message from the BCM indicates the brakes are applied. This diagnostic will run when the serial data message and the voltage signal on the brake switch signal circuit do not match for 8 out 10 times, and the condition is present for greater than 2 s.

P0573

This DTC will set when the ECM detects a short to voltage on the discrete brake signal circuit when the serial data message from the BCM indicates the brakes are not applied. This diagnostic will run when the serial data message and the voltage signal on the brake switch signal circuit do not match for 8 out 10 times, and the condition is present for greater than 2 s.

Actions Taken When the DTC Sets


image The malfunction indicator lamp (MIL) will not illuminate. image The cruise control system is disabled.

Conditions for Clearing the DTC


image The condition responsible for setting the DTC no longer exists.

image A history DTC will clear after 40 malfunction-free ignition cycles have occurred.


Reference Information


Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

image Circuit Testing

image Connector Repairs

image Testing for Intermittent Conditions and Poor Connections image Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition On/Vehicle in Service Mode.

2. Verify that the stop lamps operate properly and that no B22 Brake Pedal Position Sensor related DTCs are

set.

image If brake pedal position sensor related DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle

image If no brake pedal position sensor related DTCs are set

3. Refer to Circuit/System Testing.


Circuit/System Testing


NOTE: All components may need to be disconnected on the cruise control brake signal circuit to isolate a short to voltage, short to ground or an open/high resistance condition. Use the schematic to identify the proper brake signal terminal (circuit 6311) at the K20 Engine Control Module.


1. Ignition/Vehicle Off, disconnect the harness connector at the K20 Engine Control Module, Ignition On/Vehicle in Service Mode.

2. Connect a test lamp between the signal circuit terminal and ground.

3. Verify the test lamp turns ON and OFF when pressing and releasing the brake pedal.

image If the test lamp is always OFF

1. Ignition/Vehicle Off, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the signal circuit and ground.

image If not infinite resistance, repair the short to ground on the circuit. image If infinite resistance.

3. Test for less than 2 Ω in the signal circuit end to end.

image If 2 Ω or greater, repair the open/high resistance in the circuit. image If less than 2 Ω, replace the K9 Body Control Module.

image If the test lamp is always ON

1. Ignition/Vehicle Off, disconnect the harness connector at the K9 Body Control Module, Ignition On/Vehicle in Service Mode.

2. Test for less than 1 V between the signal circuit and ground.

image If 1 V or greater, repair the source of voltage on the circuit. image If less than 1 V replace the K9 Body Control Module.

image If the test lamp turns ON and OFF

4. Replace the K20 Engine Control Module.


Repair Instructions


Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for control module replacement, programming, and setup.

DTC P0575: CRUISE CONTROL SWITCH SIGNAL MESSAGE COUNTER INCORRECT

Diagnostic Instructions

image Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. image Review Strategy Based Diagnosis for an overview of the diagnostic approach.

image Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.


DTC Descriptor


DTC P0575

Cruise Control Switch Signal Message Counter Incorrect

Circuit/System Description


When a cruise control function switch is activated, the body control module (BCM) detects a predetermined voltage. The BCM sends a serial data message to the engine control module (ECM) indicating the function that has been requested.

Conditions for Running the DTC


image The ignition is ON.

image The vehicle speed is greater than 40 km/h (25 MPH) and the cruise control is engaged.


Conditions for Setting the DTC


image The ECM receives an invalid cruise control switch status serial data message from the BCM. image This diagnostic runs continuously.

Actions Taken When the DTC Sets DTC P0575 is a type C DTC. Conditions for Clearing the DTC DTC P0575 is a type C DTC. Reference Information

Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

image Circuit Testing

image Connector Repairs

image Testing for Intermittent Conditions and Poor Connections image Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Verify that no DTCs are set, except DTC P0575.

image If any other DTC is set, except DTC P0575

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

image If only DTC P0575 is set

2. Replace the K9 Body Control Module.

3. Verify DTC P0575 does not set when operating the vehicle within the Conditions for Running the DTC.

image If the DTC sets

Replace the K20 Engine Control Module.

image If the DTC does not set

4. All OK.


Repair Instructions


Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for BCM or ECM replacement, programming, and setup.

DTC P0703: BRAKE SWITCH SIGNAL MESSAGE COUNTER INCORRECT

Diagnostic Instructions


image Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. image Review Strategy Based Diagnosis for an overview of the diagnostic approach.

image Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.


DTC Descriptor


DTC P0703

Brake Switch Signal Message Counter Incorrect

Circuit/System Description


The body control module (BCM) monitors the brake pedal position sensor. When the brake pedal is applied, the

BCM detects a predetermined voltage signal. The BCM sends a serial data message to the engine control module (ECM) indicating the status of the stop lamps.

Conditions for Running the DTC


The engine is ON.

Conditions for Setting the DTC


image The ECM receives an invalid brake pedal status serial data message from the BCM. image This diagnostic runs continuously.

Actions Taken When the DTC Sets


image The malfunction indicator lamp (MIL) will not illuminate. image The cruise control system is disabled.

Conditions for Clearing the DTC


image The condition responsible for setting the DTC no longer exists.

image A history DTC will clear after 40 malfunction-free ignition cycles have occurred.


Reference Information


Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

image Circuit Testing

image Connector Repairs

image Testing for Intermittent Conditions and Poor Connections image Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify that no DTCs are set, except DTC P0703.

image If any other DTC is set, except DTC P0703

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

image If only DTC P0703 is set

2. Replace the K9 Body Control Module.

3. Verify DTC P0703 does not set when operating the vehicle within the conditions for running the DTC.

image If the DTC sets

Replace the K20 Engine Control Module.

image If the DTC does not set

4. All OK.


Repair Instructions


Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for BCM or ECM replacement, programming, and setup.

DTC P158A: CRUISE CONTROL CALIBRATION INCORRECT

Diagnostic Instructions


image Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. image Review Strategy Based Diagnosis for an overview of the diagnostic approach.

image Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.


DTC Descriptor


DTC P158A

Cruise Control Calibration Incorrect

Circuit/System Description


The type of cruise control system the vehicle has is programmed into the body control module and the engine control module. If this information is not the same in both modules DTC P158A will set.

Conditions for Running the DTC This diagnostic runs continuously. Conditions for Setting the DTC

The type of cruise control system programmed into the body control module does not match what is programmed into the engine control module.

Actions Taken When the DTC Sets DTC P158A is a Type C DTC. Conditions for Clearing the DTC

DTC P158A is a Type C DTC. Reference Information Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

image Circuit Testing

image Connector Repairs

image Testing for Intermittent Conditions and Poor Connections image Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify that no DTCs are set, except DTC P158A.

image If any other DTC is set, except DTC P158A

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

image If only DTC P158A is set

2. Reprogram the K9 Body Control Module and the K20 Engine Control Module one after the other. Do not place the Ignition On/Vehicle in Service Mode between each programming event.

3. Verify DTC P158A does not set when operating the vehicle within the conditions for running the DTC.

image If the DTC does not set

4. All OK.


Repair Instructions


Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for control module replacement, programming, and setup.

SYMPTOMS - CRUISE CONTROL


NOTE: The following steps must be completed before using the symptom tables.


1. Before using the symptom diagnostic table, perform the Diagnostic System Check - Vehicle in order to verify the following conditions:

image There are no DTCs set.

image The module can communicate via the serial data.

2. Review the system operation in order to understand the system functions. Refer to Cruise Control Description and Operation.

Visual/Physical Inspection


image Inspect for aftermarket devices which can affect the operation of the Cruise Control System. Refer to

Checking Aftermarket Accessories .

image Inspect the accessible system components or the visible system components for obvious damage or for obvious conditions which can cause the symptom.

Intermittent


Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List


Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

image Cruise Control Malfunction - DTC B3794, P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A-P155C, or P162C

image Cruise Control Indicator Malfunction

CRUISE CONTROL INDICATOR MALFUNCTION

Diagnostic Instructions


image Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. image Review Strategy Based Diagnosis for an overview of the diagnostic approach.

image Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.


Circuit/System Description


The instrument cluster illuminates the cruise control engaged indicator based on serial data messages received from the engine control module (ECM). The indicator is commanded ON when the cruise control system is controlling vehicle speed, and turned OFF with the system disengaged.

Reference Information


Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

image Circuit Testing

image Connector Repairs

image Testing for Intermittent Conditions and Poor Connections image Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Verify the cruise control indicator turns ON and OFF when commanding the All Indicators ON and OFF with a scan tool.

image If the indicator does not turn ON and OFF

Replace the P16 Instrument Cluster.

image If the indicator turns ON and OFF

2. All OK.


Repair Instructions


Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for instrument cluster replacement, programming and setup.

CRUISE CONTROL MALFUNCTION - DTC B3794, P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A-P155C, OR P162C

Diagnostic Instructions


image Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. image Review Strategy Based Diagnosis for an overview of the diagnostic approach.

image Refer to Diagnostic Procedure Instructions to provide an overview of each diagnostic category.


DTC Descriptors


DTC B3794

Cruise Control Function Request Circuit

DTC P0564

Cruise Control Multifunction Switch Circuit

DTC P0565

Cruise Control Switch Circuit

DTC P0567

Cruise Control Resume Switch Circuit

DTC P0568

Cruise Control Set Switch Circuit

DTC P056C

Cruise Control Cancel Switch Circuit

DTC P0580

Cruise Control Multifunction Switch Circuit Low Voltage

DTC P0581

Cruise Control Multifunction Switch Circuit High Voltage

DTC P155A

Cruise Control Switch State Undetermined

DTC P155B

Cruise Control Set/Coast Switch 2 Circuit

DTC P155C

Cruise Control Resume/Acceleration Switch 2 Circuit

DTC P162C

Vehicle Speed Limiting/Warning Switch Circuit

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information



Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Ignition

1

1

-

-


Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Signal

1

P0564

B3794 08, P0567, P0568

B3794 61, P0564

1. Cruise Control Malfunction


Circuit/System Description


The cruise control switch is an input to the body control module (BCM). The BCM monitors the cruise control on/off, set/coast, resume/accelerate and cancel switches via the cruise control switch signal circuit in order to detect when the driver has requested to perform a cruise control function. The BCM detects a specific voltage signal on the cruise control switch signal circuit when a switch is applied. The engine control module (ECM) receives the requested cruise control switch function from the BCM via a serial data message.

Conditions for Running the DTC


image The cruise control switch is ON.

image Ignition On/Vehicle in Service Mode


Conditions for Setting the DTC


B3794 08

The BCM detects an invalid voltage signal on the cruise control switch signal circuit for 1 s.

B3794 61

Stuck switch for either Resume/Accel or Set/Coast button for 60 s.

P0564, P0565, P0567, P0568, P056C

image The BCM detects an invalid voltage signal on the cruise control switch signal circuit for greater than 2 s and sends a serial data message to the ECM. The ECM sets these DTCs when the message is received.

image The ECM runs this diagnostic continuously.

P0580, P0581

image The ECM detects an invalid voltage signal on the cruise control switch signal circuit. image The above condition is present for greater than 2 s.

image The ECM runs this diagnostic continuously.

P155A

The ECM is unable to determine the state of the cruise control switch.

P162C

The ECM is unable to determine the state of the vehicle speed limiting switch.

Actions Taken When the DTC Sets

B3794

image The malfunction indicator lamp (MIL) will not illuminate. image The cruise control system is disabled.

P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A, P162C

DTCs P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A and P162C are type C DTCs

Conditions for Clearing the DTC


B3794

image The condition responsible for setting the DTC no longer exists.

image A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A, P162C

DTCs P0564, P0565, P0567, P0568, P056C, P0580, P0581, P155A and P162C are type C DTCs.

Reference Information


Schematic Reference

Cruise Control Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Cruise Control Description and Operation

Electrical Information Reference

image Circuit Testing

image Connector Repairs

image Testing for Intermittent Conditions and Poor Connections image Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition On/Vehicle in Service Mode.

2. Verify that the stop lamps operate properly and that no B22 Brake Pedal Position Sensor related DTCs are set.

image If brake pedal position sensor related DTCs are set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle

image If no brake pedal position sensor related DTCs are set

3. Verify the scan tool K9 Body Control Module Cruise Control Switch Status parameter changes between Off and On, Resume and Set when switching between each position on the cruise control switch.

image If the parameter does not change

Refer to Circuit/System Testing.

image If the parameter changes

4. Verify that no conditions that may inhibit cruise control operation are present. Refer to the K20 Engine Control Module scan tool data list Cruise Control Inhibit Reason parameter. Refer to the Cruise Control Description and Operation for a list of inhibit reasons.

image If the cruise control system has a reason why it is inhibited

Repair the condition that is causing the inhibit reason.

image If the cruise control system does not have any reasons why it may be inhibited

5. Verify that no cruise control related DTCs are set.

image If any cruise control related DTCs are set

Refer to Circuit/System Testing.

image If no cruise control related DTCs are set

6. All OK.


Circuit/System Testing


NOTE: image An open ignition circuit or fuse before the control module will cause communication DTCs or power mode mismatch DTCs to set against or in the control module. This failure mode will be diagnosed in the no communications diagnostic procedure or power mode mismatch.

image This test assumes the ignition circuit has a module driver that will open under a high current condition before the fuse opens.

image The module driver can open under normal conditions such as battery run down protection or a retained accessory power mode.

image The ignition circuit referred to below is the 12 V reference/lighting control switch reference/voltage supply circuit from the K9 Body Control Module to the S70L Steering Wheel Controls Switch-Left.

image The signal circuit referred to below is the cruise control set/coast/resume

/accelerate switch signal from the S70L Steering Wheel Controls Switch- Left to the K9 Body Control Module.


1. Ignition/Vehicle Off, disconnect the harness connector at the S70L Steering Wheel Controls Switch-Left,

Ignition On/Vehicle in Service Mode.

2. Verify a test lamp illuminates between the ignition circuit and ground.

image If the test lamp does not illuminate

1. Ignition/Vehicle Off, disconnect the harness connector at the K9 Body Control Module.

2. Test for greater than 100 Ω between the ignition circuit and ground. image If 100 Ω or less, repair the short to ground on the circuit.

image If greater than 100 Ω

3. Test for less than 2 Ω in the ignition circuit end to end.

image If 2 Ω or greater, repair the open/high resistance in the circuit. image If less than 2 Ω, test or replace the K9 Body Control Module.

image If the test lamp illuminates

3. Verify the scan tool K9 Body Control Module Cruise Control Switch Status parameter is Open/Short to Ground or Undetermined State.

image If not Open/Short to Ground or Undetermined State

1. Ignition/Vehicle Off, disconnect the harness connector at the K9 Body Control Module, Ignition/Vehicle On.

2. Test for less than 1 V between the signal circuit and ground.

image If 1 V or greater, repair the short to voltage on the circuit. image If less than 1 V, replace the K9 Body Control Module.

image If Open/Short to Ground or Undetermined State

4. Install a 3 A fused jumper wire between the signal circuit and the ignition circuit.

5. Verify the scan tool K9 Body Control Module Cruise Control Switch Status parameter is Short to Battery or Undetermined State.

image If not Short to Battery or Undetermined State

1. Ignition/Vehicle Off, disconnect the harness connector at the K9 Body Control Module.

2. Test for infinite resistance between the signal circuit and ground.

image If less than infinite resistance, repair the short to ground on the circuit. image If infinite resistance

3. Test for less than 2 Ω in the signal circuit end to end.

image If 2 Ω or greater, repair the open/high resistance in the circuit. image If less than 2 Ω, replace the K9 Body Control Module.

image If Short to Battery or Undetermined State

6. Test or replace the S70L Steering Wheel Controls Switch-Left.


Repair Instructions


Perform the Diagnostic Repair Verification after completing the repair.

Refer to Control Module References for control module replacement, programming and setup.

REPAIR INSTRUCTIONS

CRUISE CONTROL SWITCH REPLACEMENT


image


Fig. 2: Cruise Control Switch

Courtesy of GENERAL MOTORS COMPANY


Callout

Component Name

Preliminary Procedure

Remove Steering Wheel Spoke Cover. Refer to Steering Wheel Spoke Cover Replacement


1

Steering Wheel Spoke Cover Fastener (Qty: 2)


CAUTION:

Refer to Fastener Caution .


Tighten

1.5 N.m (13 lb in)


2

Cruise Control Switch

Procedure

Remove the cruise control switch from the steering wheel spoke cover.

DESCRIPTION AND OPERATION

CRUISE CONTROL DESCRIPTION AND OPERATION

image


Fig. 3: Cruise Control System Block Diagram Courtesy of GENERAL MOTORS COMPANY


Callout

Component Name

K20

K20 Engine Control Module

S70L

S70L Steering Wheel Controls Switch - Left

P16

P16 Instrument Cluster

K9

K9 Body Control Module

Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions at speeds above 40 km/h (25 mph). Steep grades may cause variations in the selected vehicle speeds.

The following are the main components of the Cruise Control System: image The accelerator pedal

image The brake pedal position (BPP) sensor image The body control module (BCM)

image The cruise on/off switch

image The cruise control cancel switch

image The + RES switch (equivalent to resume/accelerate switch) image The - SET switch (equivalent to set/coast switch)

image The engine control module (ECM)

image The throttle actuator control (TAC) motor (gasoline engines only) image The vehicle speed sensor

The body control module (BCM) monitors the signal circuit of the cruise control switches, which are located on the steering wheel. The BCM relays the cruise control switch status to the engine control module (ECM) via the serial data circuit. The ECM uses the status of the cruise control switch to determine when to capture and maintain the vehicle speed. The ECM monitors the vehicle speed signal circuit in order to determine the desired vehicle speed.

Voltage is supplied to the cruise control switch via the steering wheel control switch reference voltage circuit supplied by the BCM. The cruise control function switches are arranged in a resistive ladder design, with each cruise control function switch having a different resistance value. The BCM detects a specific voltage value that is associated with the cruise control function switch being activated. The BCM sends a serial data message to the ECM indicating that the on/off switch is active. Similarly, when the normally open + RES switch or the normally open - SET switch are pressed, the switch closes and the BCM detects the predetermined voltage signal on the cruise control resume/accel and set/coast switch signal circuit. The BCM sends a serial data message to the ECM indicating that the + RES switch or the - SET switch is active.

Cruise Control Engaged


The Cruise Control System will engage and adjust vehicle speeds, based on the activation of the following cruise control switches, which are located on the steering wheel:

image On/Off image + RES

image

- SET

To engage the Cruise Control System, ensure that the vehicle speed is above 40.2 km/h (25 mph), turn the cruise On/Off switch ON and momentarily press the - SET switch. The ECM will engage the Cruise Control System and record the vehicle speed. The ECM sends a serial data message to the instrument panel cluster (IPC) in order to illuminate the Cruise Engaged indicator in the IPC. Refer to the vehicle owner's manual for the location and operation of the cruise control On/Off indicators and driver information center (DIC) messages.

Pressing the accelerator pedal while the Cruise Control System is engaged, allows the driver to override the Cruise Control System in order to accelerate the vehicle beyond the current set vehicle speed. When the accelerator pedal is released, the vehicle will decelerate and resume the current set vehicle speed.

The driver can also override the current set vehicle speed via the - SET switch and the + RES switch. When the Cruise Control System is engaged, pressing and holding the - SET switch will allow the vehicle to decelerate from the current set vehicle speed without deactivating the Cruise Control System. When the - SET switch is released, the ECM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed.

When the Cruise Control System is engaged, momentarily pressing the - SET switch will allow the vehicle to decelerate at a vehicle specific calibratable increment, commonly 1 km/h or 1 mph, each time that the - SET is momentarily pressed, with a minimum vehicle speed of 38 km/h (24 mph). Refer to the vehicle Owner's Manual for more information.

Pressing and holding the + RES switch, when the Cruise Control System is engaged, will allow the vehicle to accelerate to a greater vehicle speed than the current set vehicle speed. When the + RES switch is released, the ECM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the Cruise Control System is engaged, momentarily pressing the + RES switch will allow the vehicle to accelerate at a vehicle specific calibratable increment, commonly 1 km/h or 1 mph, each time that the + RES switch is momentarily pressed. Momentarily activating the + RES switch will recall the previous vehicle speed, after the

cruise control system has been disengaged by pressing the brake pedal, or CANCEL switch. Refer to the vehicle Owner's Manual for more information.

Cruise Control Disengaged


The engine control module (ECM) disengages the cruise control operation based on the signals from the following switches:

image The brake pedal position (BPP) sensor image The On/Off switch

image The cruise control cancel switch

The Cruise Control System will disengage when the brake pedal is applied. The body control module (BCM) monitors the BPP sensor via the BPP sensor signal circuit as the voltage signal increases while the pedal is further applied. The ECM monitors the BPP signal through a discrete input and a serial data message signal from the BCM indicating the brake status. When either signal indicates the brake pedal is applied, the ECM will disengage the cruise control system.

The Cruise Control System will also disengage when the cruise control on/off switch is switched OFF, or the cruise control cancel switch is activated. The body control module (BCM) determines when the cruise control cancel switch is activated. When the normally open cancel switch is closed, the BCM detects the predetermined voltage signal on the cruise control function switch circuit. The vehicle speed stored in the memory of the engine control module will be erased when the cruise control On/Off switch is turned OFF, or the ignition switch is turned OFF. The BCM sends a serial data message to the ECM in order to disengage the cruise control system. When the Cruise Control System has been disengaged, the ECM sends a serial message to the instrument panel cluster (IPC) in order to turn OFF the Cruise Engaged indicator.

Every time the Cruise Control System is disengaged, the ECM will keep track of the reason for system disengagement. The last 8 disengagement reasons will be recorded within the ECM memory. The scan tool will display the last 8 Cruise Disengage History parameters, in which one out of approximately 50 possible reasons will be displayed in each of these 8 parameters. For the disengagement reason to be displayed within the scan tool parameter the Cruise Control System is active and disengagement is requested.

When engagement of the system is requested but an engagement inhibit is present, the most recent inhibit reason is recorded in the ECM history. The scan tool will display the most recent inhibit reason, in which one out of approximately 50 possible reasons will be displayed.

Cruise Control Inhibited


The engine control module (ECM) inhibits the cruise control operation when any of the following conditions exist:

image The ECM has not detected a brake pedal activation from the body control module (BCM) this ignition cycle.

image A Cruise Control System DTC has been set.

image The vehicle speed is less than 38.6 km/h (24 mph). image The vehicle speed is too high.

image The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.

image The engine RPM is low. image The engine RPM is high.

image The system voltage is not between 9 volts and 16 volts.

image The Antilock Brake System (ABS)/Traction Control System (TCS) is active for more than a calibratable time (typically 0.3 to 0.7 seconds).

Cruise Control Inhibit Reasons


This is a general list of inhibit reasons. Not every inhibit reason is applicable to all vehicles. Refer to the scan tool inhibit reason list for the last 8 reasons that have been recorded during the current ignition cycle.


Scan Tool Name

Description

Long Description

Acceleration Rate too High

High acceleration

The vehicle acceleration rate is too high.

Acceleration Time

Rate limiting fault

Cruise torque request rate limiting active too long.


Adaptive Cruise Control Configuration Incorrect


Adaptive cruise control option mismatch

The cruise control type (adaptive cruise or conventional cruise) is mismatched between the engine control module (ECM) and the body control module (BCM).

Antilock Braking System Active


Antilock Braking System Active

The antilock braking system was active. Only reported on enhanced cruise control vehicles.

Automatic Braking Engine Torque Request Signal Communication Malfunction

Automatic braking engine torque request signal communication malfunction

An engine control module to electronic brake control module (EBCM) serial data fault is active or communication has been lost between the modules.


Automatic Braking Malfunction


Brake system malfunction

The electronic brake control module has detected a failure that does not allow automatic braking to be performed.


Axle Torque Serial Communication Malfunction


Axle Torque Serial Communication Malfunction

The adaptive cruise control is being inhibited by the ECM because a serial data signal timeout error has occurred with the hybrid max/min torque signals.


Battery Voltage Too High

Voltage above high voltage threshold

The ignition voltage is too high at the engine control module (typically 18 volts).


Battery Voltage Too Low

Voltage below low voltage threshold

The ignition voltage is low at the engine control module (typically 9 volts).

Brake Pedal Applied

Brake pedal apply

The brake pedal was applied.


Scan Tool Name

Description

Long Description


Brake Pedal Not Initialized


Brake before cruise

The brake pedal has not been seen as applied prior to driver request to engage cruise with set switch. A brake pedal apply must be seen before allowing cruise engagement during each key cycle. On a vehicle equipped with a manual transmission, a clutch pedal apply may satisfy the brake pedal apply criteria.

Brake Pedal Position Malfunction

Brake pedal position signal invalid

A brake pedal apply circuit fault has been detected.


Brake Pedal Position Signal Malfunction

DTC P0703 is active or maximum time elapsed without receiving a valid Brake Pedal Position signal.

A serial data fault is active or communication has been lost with the module sending the brake pedal apply state.


Brake Pedal Pressure Detected


Brake pedal driver applied pressure detected

A brake pedal apply has been detected based on brake pedal pressure as measured by the electronic brake control module.

Brake Pedal Released Position Not Learned

Brake apply sensor home position not learned

The brake pedal position sensor released position is not learned.

Brake System Malfunction

Adaptive cruise control automatic braking failed

Adaptive cruise control automatic braking inoperative.

Calculated Torque

Calculated engine torque

The engine torque calculation is incorrect.

Clutch Pedal Applied

Clutch switch active

The clutch pedal was applied.


Coast Below Minimum Speed


Coast below low speed inhibit

The Set/Coast switch was depressed and the vehicle slowed below the minimum cruise control operating speed.


Coast Mode


Coast disengage

Cruise control is in coast mode with the Set/Coast switch depressed and is requesting no throttle.

Control Function Active

DLC override

A scan tool is plugged into the Data Link Connector (DLC) connector.

Control Module Memory Malfunction

Memory failure

A control module memory failure has been detected.

Control Module Processor Malfunction

Processor integrity fault (random access memory corruption)

An engine control module software error has occurred.

Crawl Mode Active

Crawl Mode Active

Crawl mode is active and inhibiting cruise control.

Cruise Control Cancel Switch Active

Cancel switch active

The cruise control cancel switch was depressed.


Scan Tool Name

Description

Long Description

Cruise Control Software Malfunction

Sequence of completion checks

A cruise control software execution error has occurred.

Cruise Control Switch Inactive

On/Off switch in Off state

The cruise control On/Off switch is turned off.

Cruise Control Switch Invalid

Analog cruise switch input out of range

The cruise control switch voltage signal is in an invalid range.


Cruise Control Switch Serial Communication Malfunction


Serial data fault (cruise switch serial communication fault)

The cruise control switch serial data fault is active or communication has been lost with the module sending cruise control switch states.

Deceleration Rate Too High

High deceleration

The vehicle deceleration rate is too high.

Diagnostic Trouble Code (DTC) Set

Malfunction in PCM/ECM (DTC active)

A DTC is active or in history that inhibits cruise control operation.

Distance Sensing Cruise Control Brake Pedal Applied

Distance Sensing Cruise Control Brake Pedal Applied

Adaptive cruise control is being inhibited by the ECM because a brake pedal apply has occurred.

Distance Sensing Cruise Control Cancel Switch Active

Distance Sensing Cruise Control Cancel Switch Active

Adaptive cruise control is being inhibited by the ECM because the driver applied the cancel switch.


Distance Sensing Cruise Control Data

Serial data fault for adaptive cruise control throttle control and brake control signals sent by the distance sensing cruise control module

A distance sensing cruise control module serial data fault is active or communication has been lost between the distance sensing cruise control module and the engine control module.

Distance Sensing Cruise Control Inhibit

Distance sensing cruise control inhibited

The distance sensing cruise control system is inhibited.


Distance Sensing Cruise Control Invalid Engage


Distance Sensing Cruise Control Invalid Engage

Adaptive cruise control is being inhibited by the ECM because an invalid sequence of cruise control applies, brake pedal applies, or an invalid speed range has been detected.


Distance Sensing Cruise Control Off


Distance Sensing Cruise Control Off

Adaptive cruise control is being inhibited by the ECM because the driver has turned off the cruise on/off switch.

Distance Sensing Cruise Control Reduced Engine Power

Distance Sensing Cruise Control Reduced Engine Power

Adaptive cruise control is being inhibited by the ECM due to a fault resulting in "Reduced Engine Power".

Driven Wheel Speed Higher Than Non Driven Wheel Speed

Driven wheel speed greater (wheel slip detection)

The driven wheel speed is greater than the non driven wheel speed (slip detection).

Engine Control Module

PCM/ECM inhibit (RAM corruption)

Engine control module internal communication error.


Scan Tool Name

Description

Long Description

Engine Control Module (ECM) Reset

ECM running reset

An engine control module running reset has occurred.

Engine Overspeed Protection Active

Injectors disabled (engine overspeed fuel cut-off active)

Engine RPM limiter active with fuel cut off active.

Engine Overtemperature Protection Active

Engine metal overtemp active

The engine is over temperature. The engine is overheated.

Engine Run Time

Engine run time not elapsed

The engine has not been running long enough, typically five seconds.


Engine Speed


Engine speed too low or too high

The engine RPM is too low (near stall) or too high (near engine RPM fuel shutoff).


Excessive Accelerator Position Override


Pedal greater than cruise (override)

The driver has overridden cruise control set speed with accelerator pedal for greater than an allowable time.

1st Gear

First Gear

Transmission is engaged in 1st gear.

Gear Change without Applied Clutch Pedal

Manual transmission out of gear with no clutch pedal apply

Manual transmission shifted to Neutral without clutch pedal being applied.

Hill Descent Control Active

Hill Descent Control System Active

The hill descent control system has gone active.


Hill Descent Control Serial Communication Malfunction


Hill Descent Control Serial Communication Malfunction

An electronic brake control module serial data fault is active or communication has been lost between the EBCM and ECM.


Hybrid/EV System


Hybrid Cruise Disengage

Cruise control is inhibited on hybrid applications when "Regen on Demand" is requested by the driver via the tap- up/tap-down paddles.

Illegal Mode

Illegal cruise mode

The cruise control mode is incorrect based on switch states.


Lane Center Control Serial Data Error


Lane Center Control Serial Communication Malfunction

Adaptive cruise control is being inhibited by the ECM because a serial data error has been detected on a vehicle with Lane Center Control.

Non Driven Wheel Speed Higher Than Drive Wheel Speed


Non-driven wheel speed greater

The non driven wheel speed is greater than the driven wheel speed.


None


None

This disengagement reason may be displayed after a dead battery repair or module replacement.

Park Brake Applied

Park brake switch signal active

The parking brake is applied.

Power Take-Off Active

Power Take Off active

The Power Take Off (PTO) system is active.

Rear Axle in Low Range

Rear axle in low

The rear axle is in low range.


Scan Tool Name

Description

Long Description

Set/Coast and Resume/Accelerate Switches Active Simultaneously

SET and RESUME switches simultaneously active

The Set/Coast and Resume/Accelerate switches were pressed simultaneously.

Set/Coast Switch Active With Vehicle Speed Higher Than Set Point


Over schedule tap-down

The Set/Coast switch is selected, vehicle speed is above set speed and does not decrease. May be due to traveling down hill.


Speed Limiting/Warning System On


Speed limiter/warning On/Off switch turned on

Driver has turned on the Speed Limiter/Warning on/off switch. Cruise is disabled/inhibited and cruise on/off switch will be set to Off.

Throttle Actuator Control System

Electronic throttle control prevents cruise operation

The electronic throttle control system has detected a failure in the throttle control hardware.

Traction Control Active

Traction control active

The traction control system was active.

Traction Control System Malfunction

Traction Control System Malfunction

A fault is present in the traction control system.

Traction Control System Off

Traction Control System Off

The traction control system has been turned off by the driver.

Transfer Case in 4WD Low Range

Transfer case in 4WD Low

The transfer case is in low range.

Transmission Gear Ratio Malfunction


Transmission gear fault

A transmission DTC is active or in history, that inhibits cruise control operation.

Transmission Not in Forward Gear

Transmission in neutral, reverse or park

The transmission gear selector is not in a forward gear.

Vehicle Overspeed Protection Active

MPH limited fuel (vehicle overspeed fuel cut-off active)

The vehicle overspeed protection is active with fuel cut off active.


Vehicle Speed Higher Than Set Point


Over schedule

Vehicle speed has exceeded driver selected set speed by more than an allowable amount. This may occur while driving down a significant grade or driver overriding cruise while performing a passing maneuver.

Vehicle Speed Lower Than Set Point


Under schedule

The vehicle speed is below cruise control set speed by more than an allowable amount.

Vehicle Speed Too High

Vehicle speed exceeds high speed threshold

Vehicle speed has exceeded maximum cruise operating speed.


Vehicle Speed Too Low


Vehicle speed drops below low speed threshold

Vehicle speed dropped below the cruise control minimum operating speed. May be due to hilly terrain and low vehicle speed. Manual transmission gear selection and engine

Scan Tool Name

Description

Long Description



torque may contribute to this disengagement reason.

Vehicle Stability System Active

Vehicle stability control active

The vehicle stability control system was active.

Vehicle Stability System Malfunction

Vehicle Stability System Malfunction

A fault has been detected in the vehicle stability control system.

Vehicle Stability System Off

Vehicle Stability System Off

The vehicle stability control system has been turned off by the driver.


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