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 depressed.

Did you perform A 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. Connect a test lamp between the automatic transmission shift lock control switch ignition 1 voltage circuit at the automatic transmission shift lock control switch and a good ground.
2. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 4

Go to Step 11

1. 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.
2. Turn ON ignition, with the engine OFF.
3. Press and release the brake pedal several times while observing the test lamp.

Does the test lamp turn ON and OFF with the brake pedal?

Go to Step 5

Go to Step 8

1. 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.
2. Turn ON ignition, with the engine OFF.
3. Press and hold the brake pedal.

Does the test lamp illuminate?

Go to Step 6

Go to Step 12

1. Ensure the transmission shift lever is in the PARK position.
2. Connect a test lamp between A/T shift lock control solenoid signal circuit at the automatic transmission shift lock control solenoid and battery positive voltage.
3. Turn ON ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 9

Go to Step 7

1. Connect a test lamp between automatic transmission shift lock control solenoid signal circuit at the body control module (BCM) and battery positive voltage.
2. Turn ON ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 13

Go to Step 10

1. Inspect for proper automatic transmission shift lock control switch adjustment. Refer to Stop Lamp Switch Adjustment in Hydraulic Brakes.
2. Inspect for poor connections 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 17

Go to Step 14

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 17

Go to Step 15

Inspect for poor connections at 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 17

Go to Step 16

Repair the open in the automatic transmission shift lock control switch ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 17

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Repair the open 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 17

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

Did you complete the repair?

Go to Step 17

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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 17

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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 17

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

Did you complete the replacement?

Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2