< Назад | Содержимое | Далее >

‌SPECIFICATIONS‌

FASTENER SPECIFICATIONS

RESTRAINTS

Seat Belts - Volt

Reusable Threaded Fastener Tightening Specifications

SCHEMATIC WIRING DIAGRAMS

SEAT BELT WIRING SCHEMATICS

Seat Belts

Fig. 1: Seat Belts

Courtesy of GENERAL MOTORS COMPANY

DIAGNOSTIC INFORMATION AND PROCEDURES

SEAT BELT SYSTEM OPERATIONAL AND FUNCTIONAL CHECKS

NOTE: If the vehicle has been in a collision, refer to Repairs and Inspections Required After a Collision for additional information.

Perform the following inspection from the driver seat:

1. Turn the ignition switch to the ON position. Verify proper operation of the seat belt reminder lamp with the belt buckled and with the belt unbuckled.

2. Inspect the shoulder belt guide in order to ensure that the following conditions are met: The shoulder belt guide swivels freely.

The seat belt webbing is seated flat in the guide slot. The seat belt webbing does not bind.

3. Verify that the seat belt buckle faces inboard and is accessible.

4. Verify that the seat belt retractor units are securely attached.

5. Verify that the seat belt anchor bolts are secure.

6. Fully extend the seat belt webbing. Verify that the seat belt webbing does not have any twists or tears.

7. Allow the seat belt webbing to retract. Verify that the seat belt webbing returns freely and completely back into the retractor. If the seat belt webbing will not retract, refer to Seat Belt Does Not Retract.

8. Snap the seat belt latch plate into the buckle.

9. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle remain locked when tugged.

10. Push the button on the buckle:

Verify that the seat belt latch plate releases easily from the buckle. Verify that the button returns to its original position.

Perform the following inspection procedure from the passenger seat.

1. Verify the automatic locking retractor (ALR) feature operates properly by performing the following checks:

1. Pull the seat belt all the way out of the retractor until it stops.

2. Slowly allow the belt to retract partially, while listening for a ratcheting sound.

3. Sharply tug on the belt ensuring that the retractor lock sets and does not allow the belt to be pulled from the retractor.

4. After performing steps 1.1 through 1.3 ensure the belt fully retracts.

2. Repeat the inspection procedure steps 2 through 10 from the passengers seat.

Perform the following steps in order to inspect the left and right rear seat belts:

1. Inspect the shoulder belt guide in order to ensure that the following conditions are met: The seat belt webbing is seated flat in the guide slot.

The seat belt webbing does not bind.

2. Verify that the seat belt buckle is accessible.

3. Verify that the seat belt retractor units are securely attached.

4. Verify that the seat belt anchor bolts are secure.

5. Fully extend the seat belt webbing. Verify that the seat belt webbing does not have any twists or tears.

6. Allow the seat belt webbing to retract. Verify that the seat belt webbing returns freely and completely back into the retractor.

7. Snap the seat belt latch plate into the buckle.

8. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle remain locked when tugged.

9. Push the button on the buckle:

Verify that the seat belt latch plate releases easily from the buckle. Verify that the button returns to its original position.

Emergency Locking Retractors

WARNING: Perform this test in an area clear of other vehicles or obstructions. Do not conduct this test on the open road. A large, empty parking lot is suitable. Failure to observe this precaution may result in damage to the vehicle and

possible personal injury.

1. Fasten the seat belts, an assistant is needed when the retractor under test is not part of the driver seat belt.

2. Accelerate the vehicle slowly to 16 km/h (10 mph) and apply the brakes firmly.

3. Verify that the seat belt locks when braking firmly.

NOTE: When performing this check, note the position that the retractors are mounted. Some retractors are not mounted at a zero degree inclination.

4. If the belt does not lock, proceed with the following steps:

1. Remove the seat belt retractor assembly.

2. Tilt the seat belt retractor slowly.

Fig. 2: Checking Seat Belt Retractor Inclination Courtesy of GENERAL MOTORS COMPANY

3. Ensure that the seat belt webbing can be pulled from the retractor at an inclination of 15 degrees forward or less, from the retractors mounted position.

4. Ensure the retractor cannot be pulled from the retractor at an inclination of 45 degrees forward or more.

5. If a seat belt retractor does not operate as described, replace the retractor assembly.

DTC B0072 OR B0073: DRIVER/PASSENGER SEAT BELT SWITCH

Diagnostic Instructions

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

Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC Descriptors

DTC B0072

Driver Seat Belt Switch

DTC B0073

Passenger Seat Belt Switch

For symptom byte information refer to Symptom Byte List .

Diagnostic Fault Information

Circuit/System Description

The inflatable restraint seat belt buckle switch is within the seat belt buckle and provides an input to the Inflatable Restraint Sensing and Diagnostic Module (SDM). The Inflatable Restraint Sensing and Diagnostic Module supplies a low reference circuit and a seat belt switch signal circuit to determine a buckled or unbuckled condition. The Inflatable Restraint Sensing and Diagnostic Module monitors the seat belt switch circuits and if a fault is detected a DTC will be set.

Conditions for Running the DTC Ignition voltage is between 9 - 16 V. Conditions for Setting the DTC B0072 01 or B0073 01

The seat belt switch circuit is shorted to voltage.

B0072 02 or B0073 02

The seat belt switch circuit is shorted to ground.

B0072 04 or B0073 03

The seat belt switch circuit is open.

B0072 05 or B0073 05

The seat belt switch circuit is shorted to voltage or open.

B0072 06 or B0073 06

The seat belt switch circuit is shorted to ground or open.

B0072 08 or B0073 08

The seat belt switch signal is invalid.

B0072 0B or B0073 0B

The seat belt switch signal is above threshold.

B0072 0C or B0073 0C

The seat belt switch signal is below threshold.

Action Taken When the DTC Sets

The inflatable restraint sensing and diagnostic module will store a DTC and illuminate the Air Bag indicator in the instrument cluster.

Conditions for Clearing the DTC

The condition for setting the DTC no longer exists.

Reference Information

Schematic Reference

Seat Belt Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Supplemental Inflatable Restraint System Description and Operation

Electrical Information Reference

Circuit Testing

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Vehicle ON.

2. Verify the appropriate scan tool Seat Belt Status parameter changes between Buckled and Unbuckled when the seat belt is buckled and unbuckled.

If the parameter does not change

Refer to Circuit/System Testing.

If the parameter changes

3. All OK.

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

B153D Seat Belt Buckle-Driver

B153P Seat Belt Buckle-Passenger

K36 Inflatable Restraint Sensing and Diagnostic Module

1. Vehicle OFF, disconnect the harness connector at the appropriate B153 Seat Belt Buckle.

2. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.

If 5 Ω or greater

1. Vehicle OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Test for less than 2 Ω in the low reference circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If less than 5 Ω

3. Vehicle ON.

4. Verify the appropriate scan tool Seat Belt Status parameter is Buckled.

If not Buckled

1. Vehicle OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Test for infinite resistance between the signal circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If Buckled

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.

6. Verify the appropriate scan tool Seat Belt Status parameter is Unbuckled.

If not Unbuckled

1. Vehicle OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, Vehicle ON.

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

If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V

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

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If Unbuckled

7. Test or replace the B153 Seat Belt Buckle.

Component Testing

1. Vehicle OFF, disconnect the harness connector at the B153 Seat Belt Buckle.

2. Test for infinite resistance between the signal terminal 2 and the low reference terminal 1.

If less than infinite resistance

Replace the B153 Seat Belt Buckle.

If infinite resistance

3. Insert the seat belt into the buckle.

4. Test for less than 5 Ω between the signal terminal 2 and the low reference terminal 1.

If 5 Ω or greater

Replace the B153 Seat Belt Buckle.

If less than 5 Ω

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Front Seat Belt Buckle Replacement

SIR/SRS Wiring Repairs

Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, setup, and programming

DTC B059A: PASSENGER SEAT BELT INDICATOR CIRCUIT

Diagnostic Instructions

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

Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC Descriptors

DTC B059A 01

Passenger Seat Belt Indicator Circuit Short to Battery

DTC B059A 02

Passenger Seat Belt Indicator Circuit Short to Ground

DTC B059A 04

Passenger Seat Belt Indicator Circuit Open

Diagnostic Fault Information

Circuit/System Description

The Inflatable Restraint Sensing and Diagnostic Module (SDM) monitors the passenger seat status and the passenger seat belt buckle switch and provides an output to the passenger seat belt indicator. When the Inflatable Restraint Sensing and Diagnostic Module detects the passenger seat is occupied and the seat belt is not fastened, the Inflatable Restraint Sensing and Diagnostic Module supplies a pulse width modulated signal to control the passenger seat belt indicator circuit. The Inflatable Restraint Sensing and Diagnostic Module monitors the passenger seat belt indicator circuits and if a fault is detected a DTC will be set.

Conditions for Running the DTC Ignition voltage is between 9 - 16 V. Conditions for Setting the DTC B059A 01

The passenger seat belt indicator circuit is shorted to voltage.

B059A 02

The passenger seat belt indicator circuit is shorted to ground.

B059A 04

The passenger seat belt indicator circuit is open.

Action Taken When the DTC Sets

The Inflatable Restraint Sensing and Diagnostic Module will store the DTC.

Conditions for Clearing the DTC

The condition for setting the DTC no longer exists.

Reference Information

Schematic Reference

Seat Belt Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

Circuit Testing

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

S48B Multifunction Switch - Overhead Console.

K36 Inflatable Restraint Sensing and Diagnostic Module

1. Ignition OFF, disconnect the harness connector at the S48B Multifunction Switch - Overhead Console.

2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.

If 10 Ω or greater

1. Ignition OFF.

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

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Connect a test lamp between the control circuit terminal 13 and ground, ignition ON.

4. Verify the test lamp turns OFF and ON when the passenger seat belt is buckled and unbuckled with occupant in seat.

If the test lamp is always on

1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.

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

If 1V or greater, repair the short to voltage on the circuit.

If less than 1V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If the test lamp is always off

1. Disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Test for infinite resistance between the seat belt switch signal circuit terminal 45 and ground. If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance

3. Test for less than 2 Ω in each control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If test lamp turns on and off while changing between the commanded states

5. Test or replace the S48B Multifunction Switch - Overhead Console.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Roof Console Replacement for S48B Multifunction Switch - Overhead Console Replacement

Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, programming, and setup

SYMPTOMS - SEAT BELTS

NOTE: Review the seat belt system description and operation in order to familiarize yourself with the system and how it functions. Refer to Seat Belt System Description and Operation.

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the seat belt system. Refer to

Checking Aftermarket Accessories .

Inspect the easily accessible or visible system components for obvious damage or conditions which could 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 the following symptom diagnostic procedure in order to diagnose the symptom:

Seat Belt Indicator Malfunction - Driver

Seat Belt Indicator Malfunction - Passenger Seat Belt Indicator Malfunction - Rear

SEAT BELT DOES NOT RETRACT

1. Grab the seat belt webbing and slowly and firmly extract 15 - 25 mm (5/8 - 1 in) of webbing from the seat belt.

2. Release the seat belt and allow the webbing to slowly retract back into the retractor.

3. Check to see if the seat belt is released. If the seat belt is not released, repeat steps 1 and 2, two times more.

4. If the retractor does not release after repeating the steps, replace with a new retractor.

SEAT BELT INDICATOR MALFUNCTION - DRIVER

Diagnostic Instructions

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

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The driver seat belt switch is a 2-wire switch wired to the Inflatable Restraint Sensing and Diagnostic Module (SDM) using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed,

and when the seat belt is buckled the switch is open. The SDM sends the status of the driver seat belt via serial data to the instrument panel cluster. After receiving the message, the instrument panel cluster controls the illumination of the driver seat belt indicator.

Reference Information

Schematic Reference

Seat Belt Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Command the instrument cluster all indicators ON and OFF with a scan tool. The driver seat belt indicator should turn ON and OFF as commanded.

If the driver seat belt indicator does not turn ON and OFF as commanded

Replace the P16 Instrument Cluster.

If the driver seat belt indicator does turn ON and OFF as commanded

2. Monitor the scan tool Driver Seat Belt Switch parameter while buckling and unbuckling the seat belt. The parameter should display Buckled and Unbuckled when changing seat belt states.

If the scan tool Driver Seat Belt Switch parameter does not display Buckled and Unbuckled when changing seat belt states

Refer to Circuit/System Testing.

If the scan tool Driver Seat Belt Switch parameter does display Buckled and Unbuckled when changing seat belt states

3. All OK.

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

B153D Seat Belt Buckle - Driver

Seat belt switch harness connector

K36 Inflatable Restraint Sensing and Diagnostic Module

Inflatable Restraint Sensing and Diagnostic Module wiring harness connector

1. Vehicle OFF.

2. Disconnect the harness connector at the B153D Seat Belt Buckle - Driver.

3. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

If 5 Ω or greater

1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Test for less than 2 Ω in each control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If less than 5 Ω

4. Vehicle in Service Mode.

5. Verify the scan tool Driver Seat Belt Status parameter displays Buckled.

If the scan tool Driver Seat Belt Status parameter does not display Buckled

1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Test for infinite resistance between the seat belt switch signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If the scan tool Driver Seat Belt Status parameter does display Buckled

6. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.

7. Verify the scan tool Driver Seat Belt Status parameter displays Unbuckled.

If the scan tool Driver Seat Belt Status parameter does not display Unbuckled

1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Vehicle in Service Mode.

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

If 1 V or greater, repair the short to voltage on the circuit.

4. Test for less than 2 Ω in each circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If the scan tool Driver Seat Belt Status parameter does display Unbuckled

8. Replace the B153D Seat Belt Buckle - Driver.

Component Testing

1. Vehicle OFF.

2. Disconnect the harness connector at the B153D Seat Belt Buckle - Driver, buckle the driver seat belt.

3. Test for infinite resistance between the signal circuit terminal 1 and the ground terminal 2 at the B153D Seat Belt Buckle - Driver.

If there is not infinite resistance

Replace the B153D Seat Belt Buckle - Driver.

If there is infinite resistance

4. Unbuckle the driver seat belt.

5. Test for less than 1 Ω between the signal circuit terminal 1 and the ground terminal 2 at the B153D Seat Belt Buckle - Driver.

If 1 Ω or greater

Replace theB153D Seat Belt Buckle - Driver.

If less than 1 Ω

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Front Seat Belt Buckle Replacement

Control Module References for Inflatable Restraint Sensing and Diagnostic Module and Instrument Cluster replacement, programming and setup

SEAT BELT INDICATOR MALFUNCTION - PASSENGER

Diagnostic Instructions

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

Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC Descriptors

DTC B059A 01

Passenger Seat Belt Indicator Circuit Short to Battery

DTC B059A 02

Passenger Seat Belt Indicator Circuit Short to Ground

DTC B059A 04

Passenger Seat Belt Indicator Circuit Open

Diagnostic Fault Information

Circuit/System Description

The Inflatable Restraint Sensing and Diagnostic Module (SDM) monitors the passenger seat status and the passenger seat belt buckle switch and provides an output to the passenger seat belt indicator. When the Inflatable Restraint Sensing and Diagnostic Module detects the passenger seat is occupied and the seat belt is not fastened, the Inflatable Restraint Sensing and Diagnostic Module supplies a pulse width modulated signal to control the passenger seat belt indicator circuit. The Inflatable Restraint Sensing and Diagnostic Module monitors the passenger seat belt indicator circuits and if a fault is detected a DTC will be set.

Conditions for Running the DTC Ignition voltage is between 9 - 16 V. Conditions for Setting the DTC B059A 01

The passenger seat belt indicator circuit is shorted to voltage.

B059A 02

The passenger seat belt indicator circuit is shorted to ground.

B059A 04

The passenger seat belt indicator circuit is open.

Action Taken When the DTC Sets

The Inflatable Restraint Sensing and Diagnostic Module will store the DTC.

Conditions for Clearing the DTC

The condition for setting the DTC no longer exists.

Reference Information

Schematic Reference

Seat Belt Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

Circuit Testing

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

S48B Multifunction Switch - Overhead Console.

K36 Inflatable Restraint Sensing and Diagnostic Module

1. Ignition OFF, disconnect the harness connector at the S48B Multifunction Switch - Overhead Console.

2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.

If 10 Ω or greater

1. Ignition OFF.

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

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, repair the open/high resistance in the ground connection.

If less than 10 Ω

3. Connect a test lamp between the control circuit terminal 13 and ground, ignition ON.

4. Verify the test lamp turns OFF and ON when the passenger seat belt is buckled and unbuckled with occupant in seat.

If the test lamp is always on

1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.

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

If 1V or greater, repair the short to voltage on the circuit.

If less than 1V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If the test lamp is always off

1. Disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Test for infinite resistance between the seat belt switch signal circuit terminal 45 and ground. If less than infinite resistance, repair the short to ground on the circuit.

If infinite resistance

3. Test for less than 2 Ω in each control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If test lamp turns on and off while changing between the commanded states

5. Test or replace the S48B Multifunction Switch - Overhead Console.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Roof Console Replacement for S48B Multifunction Switch - Overhead Console Replacement

Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, programming, and setup

SEAT BELT INDICATOR MALFUNCTION - REAR

Diagnostic Instructions

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

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The two rear seat belt switches are 2-wire switch wired to the Inflatable Restraint Sensing and Diagnostic Module using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The Inflatable Restraint Sensing and Diagnostic Module sends the status of the rear seat belt via serial data to the driver information center (DIC). After receiving the message, the driver information center controls the illumination of the rear seat belt indicators.

Second row seating positions monitored for safety belt use are represented by a colored symbol on the

instrument cluster indicating safety belt status.

When the vehicle is started, two safety belt symbols come on and stay on for several seconds to alert the driver that passengers may need to fasten their safety belts. After the passenger safety belt is buckled, the corresponding safety belt symbol in the instrument cluster turns green. If a safety belt is not initially buckled, the instrument cluster displays a gray safety belt symbol.

While the vehicle is moving, if a second row passenger who was previously buckled becomes unbuckled, the corresponding safety belt symbol will change to flashing red for several seconds and a chime may sound.

Diagnostic Aids

The mechanical stop in the buckle may prevent latching but the switch in the buckle may momentarily open and the Inflatable Restraint Sensing and Diagnostic Module would interpret this as an occupant in the rear seat position and that the buckle was attempting to latch.

If a rear occupant attempts to latch the seat belt into the wrong buckle, the indicator may illuminate and the system assumes there is an occupant not buckled in that seat position.

An unseated connector can appear as a buckled seat belt connection.

Reference Information

Schematic Reference

Seat Belt Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify that all connectors are fully seated.

2. With a scan tool, monitor the appropriate 2nd Row Seat Belt Status parameter and P16 Instrument Cluster rear seat belt indicator while buckling and unbuckling the seat belt. The parameter should display Buckled when the rear seat belt is buckled and Unbuckled when the rear seat belt is unbuckled.

If the scan tool does not display the parameters as specified, refer to Circuit System Testing.

If the scan tool displays the parameters as specified but the P16 Instrument Cluster does not display the correct corresponding rear seat belt indicator, replace the P16 Instrument Cluster.

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

B153 Seat Belt Buckle

B153 Seat Belt Buckle harness connector

K36 Inflatable Restraint Sensing and Diagnostic Module

Inflatable Restraint Sensing and Diagnostic Module wiring harness connector

1. Vehicle OFF.

2. Disconnect the harness connector at the appropriate B153 Seat Belt Buckle.

3. Test for less than 5 Ω between the low reference circuit terminal 2 and ground.

If 5 Ω or greater

1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Test for less than 2 Ω in each control circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If less than 5 Ω

4. Vehicle in Service Mode.

5. Verify the scan tool 2nd Row Seat Belt Status parameter displays Buckled.

If the scan tool 2nd Row Seat Belt Status parameter does not display Buckled

1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Test for infinite resistance between the seat belt switch signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If the scan tool 2nd Row Seat Belt Status parameter does display Buckled

6. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.

7. Verify the scan tool 2nd Row Seat Belt Status parameter displays Unbuckled.

If the scan tool 2nd Row Seat Belt Status parameter does not display Unbuckled

1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.

2. Vehicle in Service Mode.

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

If 1 V or greater, repair the short to voltage on the circuit.

4. Test for less than 2 Ω in each circuit end to end.

If 2 Ω or greater, repair the open/high resistance in the circuit.

If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If the scan tool 2nd Row Seat Belt Status parameter does display Unbuckled

8. Replace the B153 Seat Belt Buckle.

Component Testing

1. Vehicle OFF.

2. Disconnect the harness connector at the appropriate B153 Seat Belt Buckle.

3. Buckle the B153 Seat Belt Buckle.

4. Test for infinite resistance between the signal circuit terminal 1 and the low reference terminal 2 at the B153 Seat Belt Buckle.

If there is not infinite resistance

Replace the B153 Seat Belt Buckle.

If there is infinite resistance

5. Unbuckle the B153 Seat Belt Buckle.

6. Test for less than 1 Ω between the signal circuit terminal 1 and the low reference terminal 2 at the B153 Seat Belt Buckle.

If 1 Ω or greater

Replace the B153 Seat Belt Buckle.

If less than 1 Ω

7. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Rear Seat Belt Buckle Replacement

Control Module References for Inflatable Restraint Sensing and Diagnostic Module and instrument cluster replacement, programming and setup

SEAT BELT SERVICE PRECAUTIONS

IMPORTANT: If the vehicle has been in a collision, refer to Repairs and Inspections Required After a Collision for additional information.

Do not bleach or dye the seat belt webbing. Use only the following items in order to clean the seat belt webbing:

A mild soap and water solution A soft brush or cloth

Keep sharp edges and damaging objects away from the seat belts. Avoid bending or damaging any part of

the seat belt buckle or the latch plate. Replace any seat belts which are cut or damaged in any way.

Use only the correct seat belt anchor bolts/screws and tighten the anchor bolts/screws to the correct torque value. Refer to Fastener Specifications . When installing seat belt anchor bolts, start the bolt by hand to ensure that the bolt is threaded straight.

Some seat belts and retractors require service as a set, with service replacement parts only. Do not attempt to repair to individual components that require service as a set.

Verify that the replacement part number is correct for the vehicle at that seating position. Do not substitute a seat belt from a different seating position.

REPAIR INSTRUCTIONS

REPAIRS AND INSPECTIONS REQUIRED AFTER A COLLISION

WARNING: Restraint systems can be damaged in a collision. To help avoid injury and ensure that all parts in need of replacement are replaced:

Replace any seat belt system that was in use during the collision serious enough to deploy any automatic restraint device such as air bags and seat belt pretensioners. This not only includes seat belt systems in use by people of adult size, but seat belt systems used to secure child restraints, infant carriers and booster seats, including LATCH system and top tether anchorages.

Replace any seat belt system that has torn, worn, or damaged components. This not only includes adult seat belt systems, but built-in child restraints and LATCH system components, if any.

Replace any seat belt system if you observe the words "REPLACE" or "CAUTION", or if a yellow tag is visible. Do not replace a seat belt if only the child seat caution label is visible.

Replace any seat belt system if you are doubtful about its condition. This not only includes adult seat belt systems, but built-in child restraints, LATCH system components, and any restraint system used to secure infant carriers, child restraints, and booster seats.

Do NOT replace single seat belt system components in vehicles that have been in a collision as described above. Always replace the entire seat belt system with the buckle, guide and retractor assembly, which includes the latch and webbing material.

After a minor collision where no automatic restraint device was deployed, seat belt system replacement may not be necessary, unless some of the parts are torn, worn, or damaged.

SEAT BELT LATCH STOP INSTALLATION

Fig. 3: View Of Seat Belt Latch Stop Components Courtesy of GENERAL MOTORS COMPANY

FRONT SEAT BELT BUCKLE REPLACEMENT

Fig. 4: Front Seat Belt Buckle

Courtesy of GENERAL MOTORS COMPANY

REAR SEAT BELT BUCKLE REPLACEMENT

Fig. 5: Rear Seat Belt Buckle

Courtesy of GENERAL MOTORS COMPANY

REAR CENTER SEAT BELT RETRACTOR REPLACEMENT

Fig. 6: Rear Center Seat Belt Retractor Courtesy of GENERAL MOTORS COMPANY

REAR SEAT SHOULDER BELT GUIDE REPLACEMENT

Fig. 7: Rear Seat Shoulder Belt Guide Courtesy of GENERAL MOTORS COMPANY

REAR SEAT BELT RETRACTOR REPLACEMENT

Fig. 8: Rear Seat Belt Retractor

Courtesy of GENERAL MOTORS COMPANY

DESCRIPTION AND OPERATION

SEAT BELT SYSTEM DESCRIPTION AND OPERATION

Fig. 9: Seat Belt With P14 B60 And K85 Two Rear Belts Block Diagram Courtesy of GENERAL MOTORS COMPANY

Restraint System

NOTE: If the vehicle has been in a collision, refer to Repairs and Inspections Required

After a Collision for additional information.

The vehicle has front and rear seat belts that are the primary means of occupant restraint. Seat belts help to keep the occupants inside the passenger compartment and to gradually reduce the impact forces during the following events:

Frontal impact type crashes Rear impact type crashes

Side impact type crashes Roll-over type crashes

All seat belt retractors have emergency locks. The retractors remain unlocked during normal operation and under normal driving conditions. The retractors remain unlocked during normal conditions in order to allow free movement of the upper body of each occupant. A pendulum locks the seat belt webbing into position. The pendulum causes a locking bar to engage a cog on the spool of the retractor mechanism when the following conditions occur:

A rapid extraction of the seat belt webbing from the retractor An abrupt change in vehicle speed

An abrupt change in vehicle direction

Operation of the vehicle on a steep upgrade Operation of the vehicle on a downgrade

The seat belts have an automatic locking (cinch) feature. The cinch feature is activated when the seat belt webbing is completely extended from the retractor. The cinch feature prevents the webbing from extending beyond the position from which it is allowed to retract. Use of the cinch feature is recommended for securing a child seat. The cinch feature may be cancelled by allowing the webbing to wind back completely into the retractor. After the cinch feature is cancelled, the webbing is unlocked. After the cinch feature is cancelled, the webbing will extend from the retractor. This vehicle is also equipped with a supplemental inflatable restraint (SIR) system. Refer to Supplemental Inflatable Restraint System Description and Operation .

Front Seat Belt System

The front seat belt system includes a driver and passenger seat belt pretensioner retractor and anchor. Both front seat belt pretensioners includes a seat belt switch in the seat buckle which controls a reminder lamp and a tone alarm.

NOTE: The front passenger seat is equipped with a passenger presence detection sensor, which detects an occupant. If the passenger presence detection sensor detects an empty front passenger seat, then the passenger fasten safety belt indicator will be disabled.

When the driver seat belt is buckled and the vehicle mode switch is in Vehicle ON mode, the following events will occur:

The tone alarm will not operate.

The reminder lamp will not operate.

When the passenger seat belt is buckled with an occupant sitting in the passenger front seat, Vehicle ON,

the following events will occur:

The tone alarm will not operate.

The reminder lamp, which is located within the Passenger Air Bag Disable Indicator, will not be turned ON.

When the driver seat belt is not buckled and Vehicle ON, the following events will occur: The tone alarm will operate for 4 - 8 seconds and then go OFF.

The fasten safety belt indicator will turn ON for 20 seconds, until the driver seat belt is buckled.

When the passenger seat belt is not buckled with an occupant sitting in the passenger front seat, then the Vehicle ON, the following events will occur:

The tone alarm will operate for 4 - 8 seconds and then go OFF.

The reminder lamp, which is located within the Passenger Air Bag Disable Indicator, will be turned ON.

Rear Seat Belt System

The Rear Seat Belt System includes the following components:

The rear seat belt retractor is located at the wheelhouse panel and attached to the floor panel by the rear seat shoulder belt retractor bracket.

The rear seat belt buckles are attached to each seat.

Each of the rear seat belts include a seat belt switch in the seat buckle which controls a reminder lamp and a tone alarm.

If both rear seat belts are unbuckled when the vehicle is started the rear seat belt indicators show as red indicators in the Driver Information Center.

If any rear seat belts are buckled when the vehicle is started, the corresponding indicators will be green for that seat.

When in Vehicle ON mode, a rear seat belt is buckled, the rear doors are closed and the speed exceeds 10 kph (6.5 mph) for a continuous 35 seconds the following events will occur:

The tone alarm will not operate.

The green rear seat belt indicators in the Driver Information Center will illuminate for 35 seconds.

When in Vehicle ON mode, a rear seat belt is not buckled for the duration of the ignition cycle, the rear doors are closed and the speed exceeds 10 kph (6.5 mph) for a continuous 35 seconds the following events will occur:

The tone alarm will not operate.

The red rear seat belt indicator in the Driver Information Center will remain illuminated.

When in Vehicle ON mode, a rear seat belt is buckled and during that ignition cycle is unbuckled with the rear doors closed at all times and the speed exceeding 10 kph (6.5 mph) for a continuous 35 seconds the following events will occur:

The tone alarm will operate for 3 seconds.

The red rear seat belt indicator in the Driver Information Center will illuminate and remain on for a continuous 35 seconds until the seat belt is buckled again or the ignition cycle ends.

Child Seat Restraint System

WARNING: A child in a rear-facing child restraint can be seriously injured if the right-front

A child in a rear-facing child restraint can be seriously injured if the right-front passengers air bag inflates. This is because the back of a rear-facing child restraint would be very close to the inflating air bag. NEVER use a rear-facing child restraint in this vehicle. If a forward-facing child restraint is suitable for your child, ALWAYS move the front passenger seat as far back as it will go and then install the child restraint. Be sure the child restraint position does not conflict with any additional requirements provided by the manufacturer. For more information, refer to the vehicle owners manual and the instruction that came with the child restraint.

The child seat may only be used in a forward facing seating location. The child seat should be installed and secured according to the manufacturer's directions. If the child seat has a top strap, the seat will need to be anchored. Passengers should not be allowed to sit at locations where the seat belts are being used to secure the child seat.

All vehicles are equipped with a dual-mode type retractor with emergency and automatic locking features. The automatic locking feature is for restraint of a child seat. The child seat can be secured by pulling the seat belt all the way out to lock it. Then tighten the seat belt around the child seat.

If a child seat is to be used in the second seat position, a special dealer-installed anchor must be used in order to anchor the child seat top strap. This only applies to the seats designed with the top strap provision and for the vehicles sold in Canada. In order to ensure the correct top strap angle, the child seat is only to be used at the seating position for which the top strap anchor is installed.

Fasten Safety Belt Indicators

There are three fasten safety belt indicators for this vehicle. The driver fasten safety belt reminder is displayed in the Instrument Cluster, the passenger fasten safety belt reminder is displayed in the passenger air bag disable indicator, and the rear fasten safety belt reminder is displayed in the driver information center. The fasten safety belt indicator may only be ON during RUN. The fasten safety belt indicator illuminates under the following conditions:

During the bulb check

The Inflatable Restraint Sensing and Diagnostic Module (SDM) sends the status of the driver seat belt to the instrument cluster via serial data. The passenger seat belt status is sent to the passenger air bag disable indicator via serial data. The rear seat belt status is sent to the driver information center via serial data. If any of the seat belts are unfastened, the instrument cluster will send a message requesting a chime sound to be turned ON after a bulb check.

< Назад | Содержимое | Далее >