Schematic Reference: Shift Lock Control Schematics

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

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

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. Move the shift lever to the PARK position.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool observe the PARK relay status in the body control module (PZM) data display list.

Does the scan tool display an ON status for the PARK relay?

Go to Step 4

Go to Step 16

1. Turn OFF the ignition.
2. Disconnect the PARK relay.
3. Connect a test lamp between the ignition 1 voltage circuit at the PARK relay connector and a good ground.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 5

Go to Step 17

Connect a test lamp between the battery positive voltage circuit of the PARK relay and a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 18

1. Turn OFF the ignition.
2. Connect a test lamp between the ignition 1 voltage circuit of the PARK relay and the PARK relay control circuit.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool command the PARK relay ON and OFF.

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

Go to Step 7

Go to Step 12

1. Turn OFF the ignition.
2. Connect a 10-amp fused jumper between the battery positive voltage circuit and the automatic transmission shift lock control switch supply voltage circuit at the PARK relay connector.
3. Turn ON the ignition, with the engine OFF.
4. Apply the parking brake and block the wheels.
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 8

Go to Step 13

1. Turn OFF the ignition.
2. Remove the 10-amp fused jumper.
3. Install the PARK relay.
4. Connect a test lamp between the automatic transmission shift lock control switch supply voltage circuit at the automatic transmission shift lock control switch and a good ground.
5. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 9

Go to Step 19

Connect a test lamp between the automatic transmission shift lock control solenoid supply voltage circuit at the automatic transmission shift lock control switch and a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 14

Connect a test lamp between the automatic transmission shift lock control solenoid supply voltage circuit at the automatic transmission shift lock control solenoid and a good ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 20

Connect a test lamp between the automatic transmission shift lock control solenoid ground circuit at the automatic transmission shift lock control solenoid and battery positive voltage.

Does the test lamp illuminate?

Go to Step 15

Go to Step 21

Test the control circuit of the PARK relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 26

Go to Step 16

Inspect for poor connection at the harness connector of the PARK relay connector. 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 26

Go to Step 22

Inspect for poor connection at the harness connector of the automatic transmission shift lock control switch. 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 26

Go to Step 23

Inspect for poor connection 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 26

Go to Step 24

Inspect for poor connection at the harness connector of the body control module (PZM) connector. 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 26

Go to Step 25

Repair the open or high resistance in the ignition 1 voltage circuit of the PARK relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 26

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Repair the open or high resistance in the battery positive voltage circuit of the PARK relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 26

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Repair the open or high resistance in the automatic transmission shift lock control switch supply voltage l circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 26

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Repair the open or high resistance in the automatic transmission shift lock control solenoid supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 26

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Repair the open or high resistance 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 26

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Replace the PARK relay. Refer to Connector Repairs in Wiring Systems.

Did you complete the replacement?

Go to Step 26

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Replace the automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the replacement?

Go to Step 26

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

Did you complete the replacement?

Go to Step 26

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

Did you complete the replacement?

Go to Step 26

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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 2