Schematic Reference: Shift Lock Control Schematics

Connector End View Reference: Computer/Integrating Systems Connector End Views

DEFINITION: Transmission shift lever will not move out of the PARK position with the Ignition ON and the brake pedal pressed.

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Turn ON the ignition, with the engine OFF.
2. Press and hold the brake pedal.
3. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Turn OFF the ignition.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. Press and hold the brake pedal.
5. With the scan tool, turn the brake to shift relay output control ON in the body control module (BCM) output control data list.
6. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position?

Go to Step 4

Go to Step 6

1. With the scan tool, observe the brake switch parameter in the EBCM data display list.
2. Press and release the brake pedal several times while observing the scan tool.

Does the brake switch display Applied and Released with the brake pedal operation?

Go to Step 5

Go to Diagnostic Starting Point - Lighting Systems

With the scan tool observe the TR Sw. parameter in the engine control module (ECM) data list.

Does the scan tool indicate PARK position?

Go to Step 10

Go to Diagnostic Starting Point - Engine Controls for the 2.2 L (L61) engine

or

Go to Diagnostic Starting Point - Engine Controls for the 2.4 L engine

1. Turn OFF the ignition.
2. Connect a test lamp between the automatic transmission (A/T) shift lock control solenoid control circuit and a good ground.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, command the shift lock control relay output ON in the BCM output control data list.

Does the test lamp illuminate?

Go to Step 7

Go to Step 8

Test the shift lock control solenoid ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 13

Go to Step 9

Test the A/T shift lock control circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 13

Go to Step 10

Inspect for poor connections as the harness connector of the A/T shift lock control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 13

Go to Step 11

Inspect for poor connections as the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 13

Go to Step 12

Replace the A/T shift lock control solenoid. Refer to Shift Lock Control Solenoid Replacement .

Did you complete the replacement?

Go to Step 13

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Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 13

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Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 3