Schematic Reference: Shift Lock Control Schematics

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

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

Go to Step 2

Go to Diagnostic System Check - Automatic Transmission Shift Lock Control

1. Connect a test lamp between the park/neutral position switch park signal 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 3

Go to Step 5

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.

Does the test lamp illuminate?

Go to Step 4

Go to Step 12

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

Does the test lamp illuminate?

Go to Step 11

Go to Step 16

1. Install a scan tool.
2. Ensure the transmission is in the PARK position.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the brake to shift relay status in the rear integration module (RIM) data list.

Does the scan tool display ON?

Go to Step 6

Go to Step 15

1. Turn OFF the ignition.
2. Disconnect the brake to shift relay.
3. Connect a test lamp between the brake to shift relay coil side feed circuit and a good ground.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 7

Go to Step 17

Connect a test lamp between the brake to shift relay switch side feed circuit and a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 18

1. Turn OFF the ignition.
2. Connect a test lamp between the brake to shift relay coil side feed circuit and the brake to shift relay control circuit.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, command the brake to shift relay ON and OFF.

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

Go to Step 9

Go to Step 10

1. Turn OFF the ignition.
2. Connect a 10 amp fused jumper between the brake to shift relay switch side feed circuit and the park/neutral position switch park signal circuit
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 automatic transmission shift lock operate properly?

Go to Step 14

Go to Step 19

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

Did you find and correct the condition?

Go to Step 24

Go to Step 15

Test for an 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 find and correct the condition?

Go to Step 24

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 24

Go to Step 20

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 24

Go to Step 21

Inspect for poor connections at the harness connector of the brake to shift relay. 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 24

Go to Step 22

Inspect for poor connections at the harness connector of the rear integration module (RIM). 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 24

Go to Step 23

Repair the open or high resistance in the A/T 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 24

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Repair the open or high resistance in the brake to shift relay coil side feed circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 24

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Repair the open or high resistance in the brake to shift relay switch side feed circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 24

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Repair the open or high resistance in the park/neutral position switch park signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 24

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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 24

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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 24

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Replace the brake to shift relay. Refer to Wiring Repairs in Wiring Systems.

Did you complete the replacement?

Go to Step 24

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Replace the rear integration module (RIM). Refer to Rear Integration Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 24

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Operate system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2