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TRANSMISSION
Shift Lock Control - Volt
SCHEMATIC WIRING DIAGRAMS
SHIFT LOCK CONTROL WIRING SCHEMATICS
Shift Lock
Fig. 1: Shift Lock
Courtesy of GENERAL MOTORS COMPANY
DIAGNOSTIC INFORMATION AND PROCEDURES
DTC B270A: PARK LOCK SOLENOID CONTROL CIRCUIT SHORT TO BATTERY/GROUND
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 B270A 01
Park Lock Solenoid Control Circuit Short to Battery
DTC B270A 02
Park Lock Solenoid Control Circuit Short to Ground
Diagnostic Fault Information
|
Circuit |
Short to Ground |
Open/High Resistance |
Short to Voltage |
Signal Performance |
|
Fuse B+ |
B270A 01, 1 |
B270A 01, 1 |
- |
- |
|
Control |
B270A 02, 1 |
1 |
B270A 01, 2 |
- |
|
Ground |
- |
1 |
- |
- |
|
1. Transmission shift lever will not move from PARK with the brake pedal applied. 2. Transmission shift lever will move from PARK without the brake pedal applied. |
||||
Circuit/System Description
The body control module (BCM) controls the transmission shift lock control solenoid actuator by providing a battery positive voltage to the solenoid when the brake pedal is applied. The BCM monitors the voltage and current flow of the control circuit.
Conditions for Running the DTC
The ignition switch is in the ON position.
The brake pedal is applied.
The transmission is in the PARK position.
The DTC runs continuously once the above conditions are met.
Conditions for Setting the DTC
B270A 01
The body control module detects a short to voltage in the transmission shift lock control solenoid actuator control circuit for 1 s.
B270A 02
The body control module detects a short to ground in the transmission shift lock control solenoid actuator control circuit for 1 s.
Action Taken When the DTC Sets
The body control module will not attempt to enable the voltage supply circuit of the automatic transmission park lock control solenoid until the next power switch cycle.
Conditions for Clearing the DTC
A current DTC B270A will clear when the malfunction is no longer present and the power switch is cycled.
A history DTC will clear after 100 ignition cycles with no current DTC active during the 100 power switch cycles.
Reference Information
Schematic Reference
Body Control System Schematics
Shift Lock Control Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Automatic Transmission Shift Lock Control 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. Vehicle in Service Mode.
2. Verify the scan tool Brake Transmission Shift Interlock Solenoid Actuator Command parameter changes from Inactive to Active when the brake pedal is applied.
If the Brake Transmission Shift Interlock Solenoid Actuator Command does not change
Refer to Stop Lamps Malfunction
If the Brake Transmission Shift Interlock Solenoid Actuator Command changes
3. Verify the S3 Transmission Shift Lever moves out of the PARK position when the brake pedal is applied.
If the S3 Transmission Shift Lever does not move out of the PARK position
Refer to Circuit/System Testing.
If the S3 Transmission Shift Lever does move out of the PARK position
All OK.
Circuit/System Testing
1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, Vehicle in Service Mode.
2. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
If the test lamp does not illuminate and the circuit fuse is good
1. Vehicle OFF.
2. Test for less than 2 Ω in the B+ circuit end to end.
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
If the test lamp does not illuminate and the circuit fuse is open
1. Vehicle OFF.
2. Test for infinite resistance between the B+ circuit and ground.
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance
3. Disconnect the harness connector at the S3 Transmission Shift Lever.
4. Test for infinite resistance between the control circuit terminal 4 and ground.
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S3 Transmission Shift Lever.
If the test lamp illuminates
3. Vehicle OFF and all vehicle systems OFF, connect the X1 harness connector at the K9 Body Control Module. Disconnect the harness connector at the S3 Transmission Shift Lever. It may take up to 2 minutes for all vehicle systems to power down.
4. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
If 10 Ω or greater
1. Vehicle 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
5. Vehicle in Service Mode, connect a test lamp between the control circuit terminal 4 and the ground circuit terminal 2.
6. Verify the test lamp turns ON and OFF when commanding the Brake Transmission Shift Interlock Solenoid Actuator ON and OFF with a scan tool.
If the test lamp is always OFF
1. Vehicle OFF, remove the test lamp, disconnect the X7 harness connector at the K9 Body Control Module.
2. Test for less than 2 Ω in the 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 K9 Body Control Module.
If the test lamp is always ON
1. Vehicle OFF, remove the test lamp, disconnect the X7 harness connector at the K9 Body Control Module, Vehicle in Service Mode.
2. Test for less than 1 V between the control circuit and ground.
If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, replace the K9 Body Control Module.
If the test lamp turns ON and OFF
7. Test or replace the S3 Transmission Shift Lever.
Component Testing
1. Install a 10 A fused jumper wire between the control terminal 4 and 12 V. Momentarily install a jumper wire between the ground terminal 2 and ground.
2. Verify the solenoid turns on & off/clicks, etc.
If the solenoid does not turn on & off/clicks, etc.
Replace the S3 Transmission Shift Lever.
If the solenoid does turn on & off/clicks, etc.
3. All OK
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Transmission Control Replacement (With Base) Transmission Control Replacement (Without Base)
Control Module References
for control module replacement, programming, and setup.
SYMPTOMS - AUTOMATIC TRANSMISSION SHIFT LOCK CONTROL
NOTE: The following steps must be completed before using the symptom tables.
1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following are true:
There are no DTCs set.
The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to
Automatic Transmission Shift Lock Control Description and Operation.
Visual/Physical Inspection
Inspect for aftermarket devices which could affect the operation of the automatic transmission shift lock control. 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 a symptom diagnostic procedure in order to diagnose the symptom:
Transmission Control Lever Malfunction TRANSMISSION CONTROL LEVER MALFUNCTION
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 |
Short to Ground |
Open/High Resistance |
Short to Voltage |
Signal Performance |
|
Fuse B+ |
B270A 01, 1 |
B270A 01, 1 |
- |
- |
|
Control |
B270A 02, 1 |
1 |
B270A 01, 2 |
- |
|
Ground |
- |
1 |
- |
- |
|
1. Transmission shift lever will not move from PARK with the brake pedal applied. 2. Transmission shift lever will move from PARK without the brake pedal applied. |
||||
Circuit/System Description
The body control module (BCM) controls the transmission shift lock control solenoid actuator by providing a battery positive voltage to the solenoid when the brake pedal is applied. The BCM monitors the voltage and current flow of the control circuit.
Reference Information
Schematic Reference
Body Control System Schematics
Shift Lock Control Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Automatic Transmission Shift Lock Control 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. Vehicle in Service Mode.
2. Verify the scan tool Brake Transmission Shift Interlock Solenoid Actuator Command parameter changes from Inactive to Active when the brake pedal is applied.
If the Brake Transmission Shift Interlock Solenoid Actuator Command does not change
Refer to Stop Lamps Malfunction
If the Brake Transmission Shift Interlock Solenoid Actuator Command changes
3. Verify the S3 Transmission Shift Lever moves out of the PARK position when the brake pedal is applied.
If the S3 Transmission Shift Lever does not move out of the PARK position
Refer to Circuit/System Testing.
If the S3 Transmission Shift Lever does move out of the PARK position
All OK.
Circuit/System Testing
1. Vehicle OFF, disconnect the X1 harness connector at the K9 Body Control Module, Vehicle in Service Mode.
2. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
If the test lamp does not illuminate and the circuit fuse is good
1. Vehicle OFF.
2. Test for less than 2 Ω in the B+ circuit end to end.
If 2 Ω or greater, repair the open/high resistance in the circuit.
If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
If the test lamp does not illuminate and the circuit fuse is open
1. Vehicle OFF.
2. Test for infinite resistance between the B+ circuit and ground.
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance
3. Disconnect the harness connector at the S3 Transmission Shift Lever.
4. Test for infinite resistance between the control circuit terminal 4 and ground.
If less than infinite resistance, repair the short to ground on the circuit.
If infinite resistance, replace the S3 Transmission Shift Lever.
If the test lamp illuminates
3. Vehicle OFF and all vehicle systems OFF, connect the X1 harness connector at the K9 Body Control Module. Disconnect the harness connector at the S3 Transmission Shift Lever. It may take up to 2 minutes for all vehicle systems to power down.
4. Test for less than 10 Ω between the ground circuit terminal 2 and ground.
If 10 Ω or greater
1. Vehicle 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
5. Vehicle in Service Mode, connect a test lamp between the control circuit terminal 4 and the ground circuit terminal 2.
6. Verify the test lamp turns ON and OFF when commanding the Brake Transmission Shift Interlock Solenoid Actuator ON and OFF with a scan tool.
If the test lamp is always OFF
1. Vehicle OFF, remove the test lamp, disconnect the X7 harness connector at the K9 Body Control Module.
2. Test for less than 2 Ω in the 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 K9 Body Control Module.
If the test lamp is always ON
1. Vehicle OFF, remove the test lamp, disconnect the X7 harness connector at the K9 Body Control Module, Vehicle in Service Mode.
2. Test for less than 1 V between the control circuit and ground.
If 1 V or greater, repair the short to voltage on the circuit.
If less than 1 V, replace the K9 Body Control Module.
If the test lamp turns ON and OFF
7. Test or replace the S3 Transmission Shift Lever.
Component Testing
1. Install a 10 A fused jumper wire between the control terminal 4 and 12 V. Momentarily install a jumper wire between the ground terminal 2 and ground.
2. Verify the solenoid turns on & off/clicks, etc.
If the solenoid does not turn on & off/clicks, etc.
Replace the S3 Transmission Shift Lever.
If the solenoid does turn on & off/clicks, etc.
3. All OK
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Transmission Control Replacement (With Base) Transmission Control Replacement (Without Base)
Control Module References
for control module replacement, programming, and setup.
DESCRIPTION AND OPERATION
AUTOMATIC TRANSMISSION SHIFT LOCK CONTROL DESCRIPTION AND OPERATION
The automatic transmission park lock control system is a safety device that prevents an inadvertent shift out of PARK. The driver must press the brake pedal before moving the park lever out of the PARK position. The system consists of the following components:
The automatic transmission park lock solenoid (serviced as the automatic transmission shift lock actuator), is located within the floor shift control assembly.
The body control module, which controls the voltage supply circuit of the park lock control solenoid.
The engine control module.
The body control module controls the voltage to the park lock control solenoid through the park lock control solenoid controlled voltage circuit. The following conditions must be met before the body control module will supply voltage to the park lock solenoid:
The ignition is in the ON position.
The engine control module sends an input via GMLAN serial data to the body control module indicating the transmission is in the PARK position.
The body control module determines the brake pedal is applied according the brake pedal position.
Since the park lock control solenoid is permanently grounded, the body control module supplies voltage to the automatic transmission park lock control solenoid, unlocking the park lever allowing the driver to move the park lever out of the PARK position as the solenoid energizes. When the brake pedal is not applied, the body control module turns the control voltage output of the park lock control solenoid OFF, de-energizing the park lock control solenoid. The de-energized solenoid mechanically locks the park lever in the PARK position.
