Did you review the Automatic Transmission Shift Lock Control Circuit Description and the Automatic Transmission Shift Lock Control Description ?

Go to Step 2

Go to Symptoms - Automatic Transmission Shift Lock Control

1. Turn the ignition switch to the ON position.
2. Depress the brake pedal.
3. Attempt to move the manual selector from the P position.

Can you move the manual selector from the P position?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Disconnect the shift lock relay.
2. Turn the ignition switch to the ON position.
3. Depress the brake pedal.
4. Probe the shift lock relay connector with a test lamp from cavity 3 to ground.

Does the test lamp light?

Go to Step 9

Go to Step 4

1. Backprobe the stoplamp switch connector with a test lamp from cavity 3 to ground.
2. Press and hold the brake pedal.

Does the test lamp light?

Go to Step 5

Go to Step 6

Repair the open in the GRN/WHT wire between the stoplamp switch and the shift lock relay. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 24

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Backprobe the stoplamp switch connector with a test lamp from cavity 1 to ground.

Does the test lamp light?

Go to Step 8

Go to Step 7

Repair the open in the GRN wire between the stoplamp switch and S241. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 24

--

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

Is the repair complete?

Go to Step 24

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Probe the shift lock relay connector with a test lamp from cavity 4 to B+.

Does the test lamp light?

Go to Step 11

Go to Step 10

Repair the open in the BLK wire between the shift lock relay and G105. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 24

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Probe the shift lock relay connector with a test lamp from cavity 2 to ground.

Does the test lamp light?

Go to Step 17

Go to Step 12

Backprobe the transmission range switch connector with a test lamp from cavity 7 to ground.

Does the test lamp light?

Go to Step 13

Go to Step 14

Repair the open in the ORN/GRN wire between the transmission range switch and the shift lock relay. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 24

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Backprobe the transmission range switch connector with a test lamp from cavity 6 to ground.

Does the test lamp light?

Go to Step 16

Go to Step 15

Repair the open in the YEL wire between the transmission range switch and S211. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 24

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Replace the transmission range switch. Refer to Transmission Range Switch Replacement .

Is the repair complete?

Go to Step 24

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1. Connect the shift lock relay.
2. Backprobe the shift lock relay connector with a test lamp from cavity 1 to ground.
3. Press and hold the brake pedal.

Does the test lamp light?

Go to Step 19

Go to Step 18

Replace the shift lock relay.

Is the repair complete?

Go to Step 24

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1. Disconnect the shift lock relay and the shift lock solenoid connectors.
2. Test for continuity from the shift lock relay connector cavity 1 to the shift lock solenoid connector cavity 3. Refer to Testing for Continuity in Wiring Systems.

Is continuity present?

Go to Step 21

Go to Step 20

Repair the open in the BLU/GRN wire between the shift lock relay and the shift lock solenoid. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 24

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Connect a test lamp from the shift lock solenoid connector cavity 6 to B+.

Does the test lamp light?

Go to Step 23

Go to Step 22

Repair the open in the BLK ground wire between the shift lock solenoid and G200. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 24

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Replace the shift lock solenoid. Refer to Brake Transmission Shift Interlock Solenoid Replacement .

Is the repair complete?

Go to Step 24

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3