For 1990-2009 cars only
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 |
|---|---|---|---|---|
Shift Lock Control Solenoid Control Circuit | B2705 02 | 1 | -- | -- |
Shift Lock Control Solenoid Ground Circuit | -- | 1 | -- | -- |
1. Unable to move gearshift lever with brake pedal depressed | ||||
Circuit/System Description
The body control module (BCM) controls the shift lock solenoid by providing battery voltage to the shift lock control solenoid. The BCM utilizes a smart driver to control the voltage supplied to the shift lock solenoid. The smart driver monitors the voltage and current flow of the control circuit.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Automatic Transmission Shift Lock Control Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, with the brake pedal applied, observe the scan tool Brake Applied Output Signal parameter. The reading should be ON with the brake pedal depressed.
- Ignition ON, observe the scan tool BCM shift lock solenoid command parameter. The parameter should change from ON to OFF when the brake pedal is applied and released.
- Press the brake pedal, the vehicle operator should be able to move the shifter lever out of the park position.
| ⇒ | If not the specified parameter, refer to Stop Lamps Malfunction . |
| ⇒ | If not the specified parameter, replace the BCM. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the shift lock control solenoid.
- Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal A and ground.
- Install a test lamp between the ground circuit terminal A and the control circuit terminal B.
- Ignition ON, command the scan tool BCM Shift Lock Solenoid output control ON and OFF. The test lamp should turn ON and OFF as commanded.
- If the circuit tests normal, test or replace the shift lock control solenoid.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup and programming |
