Schematic Reference: Shift Lock Control Schematics

Connector End View Reference: Body Control System Connector End Views in Body Control System.

DEFINITION: Transmission shift lever does not lock in the PARK position with the ignition ON and the brake pedal not depressed.

Did you perform the Diagnostic System Check - Automatic Transmission Shift Lock Control?

Go to Step 2

Go to Diagnostic System Check - Automatic Transmission Shift Lock Control

1. Apply the parking brake and block the wheels.
2. Turn ON the ignition, with the engine OFF.
3. Attempt to move the shift lever out of the PARK position without pressing the brake pedal.

Does the shift lever move out of the PARK position?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

1. Turn OFF the ignition.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool observe the BTSI parameter in the body module (BCM) data list.
5. Ensure the brake pedal is not depressed.

Does the scan tool display a LOCKED status for the brake to shift parameter?

Go to Step 5

Go to Step 4

With a scan tool observe the brake switch input in the body control module (BCM) data list.

Does the scan tool display an OFF status for the brake switch input parameter?

Go to Step 8

Refer to Diagnostic System Check - Lighting Systems in Lighting Systems

1. Turn OFF the ignition.
2. Disconnect the automatic transmission shift lock control solenoid electrical connector.
3. Turn ON the ignition, with the engine OFF.
4. Press and hold the brake pedal.
5. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position?

Go to Step 7

Go to Step 6

Test the automatic transmission shift lock control solenoid control circuit for a short to power. Refer to Circuit Testing and Wiring Repairs in Wiring System.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

Inspect for poor connections at the harness connector of the automatic transmission shift lock control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 9

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

Replace the automatic transmission shift lock control solenoid. Refer to Shift Lock Control Solenoid Replacement .

Did you complete the repair?

Go to Step 11

--

Replace the body control module (BCM). Refer to Body Control Module Replacement in Body Control System.

Did you complete the repair?

Go to Step 11

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2