Schematic Reference: Shift Lock Control Schematics

Connector End View Reference: Shift Lock Control Connector End Views or Body Control System Connector End Views in Body Control System

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

Did you perform the Diagnostic System Check - Automatic Transmission Shift Lock Control tests and all the necessary inspections?

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.

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. Turn OFF the ignition.
2. Connect a test lamp between the Ignition 1 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 16

1. Turn OFF the ignition.
2. Connect a test lamp between the automatic transmission shift lock control switch signal 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 5

Go to Step 12

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

Does the test lamp illuminate?

Go to Step 6

Go to Step 17

1. Turn OFF the ignition.
2. Disconnect the electrical connector of the automatic transmission shift lock control solenoid.
3. Connect a test lamp between the automatic transmission shift lock control solenoid signal circuit and the automatic transmission shift lock control solenoid controlled ground circuit at the connector of the automatic transmission shift lock control solenoid.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 13

Go to Step 7

1. Turn OFF the ignition.
2. Connect a test lamp between the automatic transmission shift lock control switch signal circuit at the brake to shift relay and a good ground.
3. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 8

Go to Step 16

1. Turn OFF the ignition.
2. Disconnect the brake to shift relay.
3. Connect a test lamp between the brake to shift relay voltage supply circuit and the brake to shift relay control circuit.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 9

Go to Step 11

1. Turn OFF the ignition.
2. Connect a test lamp between the brake to shift relay voltage supply circuit and the brake to shift relay ground circuit.
3. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 10

Go to Step 18

1. Turn OFF the ignition.
2. Connect a 10 amp fused jumper between the automatic transmission shift lock control solenoid controlled ground circuit and the brake to shift relay ground circuit.
3. Apply the parking brake and block the wheels.
4. Turn ON the ignition, with the engine OFF.
5. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position without the brake pedal depressed?

Go to Step 19

Go to Step 14

1. Turn OFF the ignition.
2. Connect a test lamp between the brake to shift relay voltage supply circuit and the brake to shift relay control circuit at the body control module (BCM) connector.
3. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 20

Go to Step 15

1. Inspect for proper adjustment of automatic transmission shift lock control switch. Refer to Stop Lamp Switch Adjustment in Lighting Systems.
2. Inspect for poor connections at the automatic transmission shift lock control switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 21

Inspect for poor connections at the automatic transmission shift lock control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 22

Inspect for poor connections at the brake to shift relay. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 23

Inspect for poor connections at the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 24

Repair the open in the ignition 1 power feed circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 25

--

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

Did you complete the repair?

Go to Step 25

--

Repair the open in the brake to shift relay ground circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 25

--

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

Did you complete the repair?

Go to Step 25

--

Repair the open or short in the brake to shift relay controlled ground circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 25

--

Replace the automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Lighting Systems.

Did you complete the replacement?

Go to Step 25

--

Replace the automatic transmission shift lock control solenoid. Refer to Automatic Transmission Shift Lock Actuator Replacement .

Did you complete the replacement?

Go to Step 25

--

Replace the brake to shift relay. Refer to Relay Replacement in Wring Systems.

Did you complete the replacement?

Go to Step 25

--

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

Did you complete the replacement?

Go to Step 25

--

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2

Schematic Reference: Shift Lock Control Schematics

Connector End View Reference: Shift Lock Control Connector End Views or Body Control System Connector End Views in Body Control System

DEFINITION: Transmission shift lever does not lock in the PARK position.

Did you perform the Diagnostic System Check - Automatic Transmission Shift Lock Control tests and all the necessary inspections?

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 OFF the ignition, with the engine OFF.
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 22

Go to Step 3

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.

Does the shift lever move out of the PARK position?

Go to Step 4

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

1. Turn OFF the ignition.
2. Connect a test lamp between the Ignition 1 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 5

Go to Step 17

1. Turn OFF the ignition.
2. Connect a test lamp between the automatic transmission shift lock control switch signal 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 6

Go to Step 13

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

Does the test lamp illuminate?

Go to Step 7

Go to Step 18

1. Turn OFF the ignition.
2. Disconnect the electrical connector of the automatic transmission shift lock control solenoid.
3. Connect a test lamp between the automatic transmission shift lock control solenoid signal circuit and the automatic transmission shift lock control solenoid controlled ground circuit at the connector of the automatic transmission shift lock control solenoid.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 14

Go to Step 8

1. Turn OFF the ignition.
2. Connect a test lamp between the automatic transmission shift lock control switch signal circuit at the brake to shift relay and a good ground.
3. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 9

Go to Step 17

1. Turn OFF the ignition.
2. Disconnect the brake to shift relay.
3. Connect a test lamp between the brake to shift relay voltage supply circuit and the brake to shift relay control circuit.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 10

Go to Step 12

1. Turn OFF the ignition.
2. Connect a test lamp between the brake to shift relay voltage supply circuit and the brake to shift relay ground circuit.
3. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 11

Go to Step 19

1. Turn OFF the ignition.
2. Connect a 10 amp fused jumper between the automatic transmission shift lock control solenoid controlled ground circuit and the brake to shift relay ground circuit.
3. Apply the parking brake and block the wheels.
4. Turn ON the ignition, with the engine OFF.
5. Attempt to move the shift lever out of the PARK position.

Does the shift lever move out of the PARK position without the brake pedal depressed?

Go to Step 20

Go to Step 15

1. Turn OFF the ignition.
2. Connect a test lamp between the brake to shift relay voltage supply circuit and the brake to shift relay control circuit at the body control module (BCM) connector.
3. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 21

Go to Step 16

1. Inspect for proper adjustment of automatic transmission shift lock control switch. Refer to Stop Lamp Switch Adjustment in Lighting Systems.
2. Inspect for poor connections at the automatic transmission shift lock control switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 23

Inspect for poor connections at the automatic transmission shift lock control solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 24

Inspect for poor connections at the brake to shift relay. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

Inspect for poor connections at the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 26

Repair the open in the ignition 1 power feed circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 27

--

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

Did you complete the repair?

Go to Step 27

--

Repair the open in the brake to shift relay ground circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 27

--

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

Did you complete the repair?

Go to Step 27

--

Repair the open or short in the brake to shift relay controlled ground circuit. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 27

--

Replace the park lock control solenoid. Refer to Automatic Transmission Shift Lock Actuator Replacement .

Did you complete the replacement?

Go to Step 27

--

Replace the automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Lighting Systems.

Did you complete the replacement?

Go to Step 27

--

Replace the automatic transmission shift lock control solenoid. Refer to Automatic Transmission Shift Lock Actuator Replacement .

Did you complete the replacement?

Go to Step 27

--

Replace the brake to shift relay. Refer to Relay Replacement in Wring Systems.

Did you complete the replacement?

Go to Step 27

--

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

Did you complete the replacement?

Go to Step 27

--

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2