Schematic Reference: Shift Lock Control Schematics

DEFINITION: Transmission shift lock does not lock in the PARK position with the ignition ON and the brake pedal not press or with the ignition OFF.

Did you perform the Symptoms- Automatic Transmission Shift Lock Control tests and necessary inspections?

Go to Step 2

Go to Symptoms - Automatic Transmission Shift Lock Control

1. Turn ON the ignition, with the engine OFF.
2. Apply the parking brakes and block the wheels.
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

1. Turn OFF the ignition.
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 Step 4

Go to Step 5

Test for a short to battery positive voltage in the ignition 1 circuit of the park lock solenoid. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 14

Go to Step 8

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

Does the test lamp illuminate?

Go to Step 6

Go to Step 11

1. Turn OFF the ignition.
2. Connect a test lamp between the A/T shift lock control solenoid supply voltage circuit at the automatic transmission shift lock control switch and a good ground.
3. Turn ON the ignition, with the engine OFF.
4. Press and release the brake pedal several times.

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

Go to Step 7

Go to Step 9

1. Turn OFF the ignition.
2. Connect a test lamp between the A/T shift lock control solenoid supply voltage circuit at the automatic transmission shift lock control solenoid and a good ground.
3. Turn ON the ignition, with the engine OFF.
4. Press and release the brake pedal several times.

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

Go to Step 8

Go to Step 10

Inspect for poor connections at the harness connector of the automatic transmission shift lock control and park lock solenoids. 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 14

Go to Step 13

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 14

Go to Step 12

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 14

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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 14

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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 14

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Important: Depress the button on the side of the shift lock actuator. With the button is depressed, cycle the plastic straw within the shift lever 3 to 5 times. The straw should move smoothly and freely except near the top of the travel where additional force will be required to mechanically actuate the park lock mechanism inside of the shift lock actuator. If there is stick/slip or abnormal friction while cycling the plastic straw or if the straw is altogether stuck in the lever, the entire control assembly (shifter and shift lock actuator) needs to be replaced. Refer to Transmission Control Replacement . If there is no abnormal friction, replace the shift lock actuator. Refer to Automatic Transmission Shift Lock Control Actuator Replacement .

Did you complete the replacement?

Go to Step 14

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2