Transmission Control Lever Malfunction (with WHB)
Transmission Control Lever Malfunction (with WHB)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
When the Instrument Panel Cluster (IPC) receives a signal from the stop lamp switch. The IPC supplies battery voltage is to the shift lock control solenoid.
Reference Information
Schematic Reference
Shift Lock Control Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Automatic Transmission Shift Lock Control Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, while pressing the brake pedal, observe the scan tool Brake Pedal Switch parameter. The reading should be Applied with the brake pedal pressed.
• If not the specified parameter, refer to Stop Lamps Malfunction (Stop Lamps Malfunction).
2. Press the brake pedal, the vehicle operator should be able to move the shifter lever out of the park position.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the automatic transmission shift lock actuator.
2. Test for less than 1 ohm between the ground circuit terminal 2 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Test for less than 1 ohm between the ground circuit terminal 3 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, connect a test lamp between the control circuit terminal 4 and ground.
5. Observe the test light while applying and releasing the brake pedal. The test lamp should turn ON and OFF when applying and releasing the brake pedal.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the IPC.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the IPC.
6. Ignition OFF, connect the harness connector at the automatic transmission shift lock actuator. Disconnect the X1 harness connector at the I/P fuse block.
7. Place the transmission lever in the park position.
8. Test for less than 1ohm between the signal circuit terminal 32 and ground.
• If greater than the specified range, test the signal circuit for an open/high resistance.
9. If all circuits test normal, test or replace the shift lock actuator.
Component Testing
1. Ignition OFF, disconnect the harness connector at the automatic transmission shift lock actuator.
2. Place the transmission lever in the park position.
3. Test for less than 1ohm between terminal 1 and terminal 2.
• If greater than the specified value, replace the automatic transmission shift lock actuator.
4. Install a 10A fused jumper wire between the control terminal 4 and 12 V. Install a jumper wire between the control terminal 3 and ground.
5. The shift lock actuator should turn on
• If the function does not perform as specified, replace the shift lock actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Shift Lock Control Solenoid Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for IPC replacement, setup and programming