Schematic Reference: Shift Lock Control Schematics

Did you review the Automatic Transmission Shift Lock Control Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Automatic Transmission Shift Lock Control

1. Turn the ignition switch to the ON position.
2. Attempt to move the selector lever out of the PARK position. The selector lever should not move from the PARK position.
3. Press and hold the brake pedal.
4. Attempt to move the selector lever out of the PARK position. The selector lever should move out of the PARK position.

Does the shift lock control operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Connect a scan tool and monitor the brake switch parameter in the Engine Data List.

Does the brake switch indicate Applied when the brake pedal is depressed?

Go to Step 6

Go to Step 4

Test the brake switch signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 5

Test the brake switch supply voltage circuit for an open. 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

Test the shift lock control module supply voltage circuits for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 7

Test the shift lock control module ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 8

Test the brake switch signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 10

Inspect for a poor connection or high resistance at the harness connector of the stoplamp 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 13

Go to Step 11

Inspect for a poor connection or high resistance at the harness connector of the shift lock control module. 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

Adjust or replace the stoplamp switch. Refer to Stop Lamp Switch Adjustment or Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the replacement?

Go to Step 13

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Replace the shift lock control module. Refer to Shift Lock Control Module Replacement .

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