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 pressed.

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. Ensure the brake pedal is not depressed.
5. With a scan tool observe the Brake to Shift Relay parameter in the body control module (BCM) data list.

Does the scan tool display an ON status for the shift lock control parameter?

Go to Step 5

Go to Step 4

With a scan, tool observe the TCC Brake Switch parameter in the powertrain control module (PCM) data list.

Does the scan tool display an OFF status for the TCC Brake Switch input parameter?

Go to Step 9

Refer to Diagnostic System Check - Lighting Systems in Lighting Systems

1. Turn OFF the ignition.
2. Connect a test lamp between the controlled voltage circuit of the automatic transmission shift lock control solenoid at the connector of the automatic transmission shift lock control solenoid and a good ground.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, command the Brake to Shift Relay output control ON and OFF several times while observing the test lamp.

Does the test lamp turn ON and OFF with each command?

Go to Step 6

Go to Step 7

1. Turn OFF the ignition.
2. Connect a test lamp between the ground circuit and the controlled voltage circuit of the automatic transmission shift lock control solenoid at the connector of the automatic transmission shift lock control solenoid.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, command the Brake to Shift Relay output control ON and OFF several times while observing the test lamp.

Does the test lamp turn ON and OFF with each command?

Go to Step 8

Go to Step 10

Test the controlled voltage circuit of the automatic transmission shift lock control solenoid for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 9

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 13

Go to Step 11

Inspect for poor connections at the harness connector of the 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 13

Go to Step 12

Repair the open in the automatic transmission shift lock control solenoid ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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Replace the automatic transmission shift lock control solenoid. Refer to Automatic Transmission Shift Lock Actuator Replacement .

Did you complete the repair?

Go to Step 13

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Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the repair?

Go to Step 13

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2