For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Shift Lock Control Schematics Connector End View Reference: Body Control System Connector End Views in Body Control System DEFINITION: Transmission shift lever will not moved out of the PARK position with the ignition ON and the brake pedal pressed.
1 | 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
2 |

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 in Wiring Systems

Go to Step 3

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 shifter unlock 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

4 |

1. With the scan tool, observe the brake switch input in the body control module (BCM) data display list.
2. Press and release the brake pedal several times while observing the scan tool.

Does the brake input display ON and OFF with the brake pedal operation?

Go to Step 5

Go to Diagnostic Starting Point - Lighting Systems in Lighting Systems

5 | With the scan tool, observe the gear position parameter in the powertrain control module (PCM) data list. Does the scan tool indicate PARK position? | Go to Step 9 | Go to Diagnostic System Check - Engine Controls in Engine Controls -- 2.2L (L61)
6 |

1. Turn OFF the ignition.
2. Disconnect the harness connector of the automatic transmission shift lock control solenoid.
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 8

7 | Test the controlled ground circuit of the automatic transmission shift lock control solenoid for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 19
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 12 | Go to Step 10
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 12 | Go to Step 11
10 | Replace the automatic transmission shift lock control solenoid. Refer to Shift Lock Control Solenoid Replacement . Did you complete the replacement? | Go to Step 12 | -
11 | Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 12 | -
12 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 3