Did you perform the Auto Trans Shift Lock Control System Check?

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Go to Step 2

Go to Automatic Transmission Shift Lock Control System Check

1. Connect a Scan Tool to the data link connector (DLC).
2. Turn the ignition switch to the RUN position.
3. Select the body control module (PZM).
4. Retrieve the PZM diagnostic trouble codes (DTCs).

Is DTC B2502 or B2503 present?

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Go to Diagnostic Trouble Code (DTC) List/Type in Body Control System

Go to Step 3

Inspect the PARK/REV fuse in the underhood fuse block.

Is the fuse open?

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Go to Step 4

Go to Step 5

1. Repair the short to ground in CKT 1940 (ORN). Refer to Wiring Repairs in Wiring Systems.
2. Replace the PARK/REV fuse in the underhood fuse block.

Did you complete the repair?

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Go to Step 27

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Inspect the CRUISE fuse in the underhood fuse block.

Is the fuse open?

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Go to Step 7

Go to Step 6

1. Repair the short to ground in CKT 339 (PNK). Refer to Wiring Repairs in Wiring Systems.
2. Replace the CRUISE fuse in the underhood fuse block.

Did you complete the repair?

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Go to Step 27

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1. Turn the ignition switch to the OFF position.
2. Remove the PARK relay.
3. Turn the ignition switch to the RUN position.
4. Use a J 39200 digital multimeter (DMM) in order to test the voltage between the PARK relay connector terminal A1 and ground. Refer to Measuring Voltage in Wiring Systems.

Is the voltage within the specified range?

10-15 V

Go to Step 9

Go to Step 8

Repair the open in CKT 1940 (ORN). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 27

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Use the J 39200 DMM in order to test the voltage between the PARK relay connector terminal A3 and ground. Refer to Measuring Voltage in Wiring Systems.

Is the voltage within the specified range?

10-15 V

Go to Step 11

Go to Step 10

Repair the open in CKT 339 (PNK). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 27

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1. Turn the ignition switch to the OFF position.
2. Connect a fused jumper between the PARK relay connector terminal A1 and terminal B3. Refer to Using Fused Jumper Wires in Wiring Systems.
3. Turn the ignition switch to the RUN position.
4. Attempt to shift the vehicle out of PARK.

Is the gear shift locked?

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Go to Step 21

Go to Step 12

1. Disconnect the stoplamp/BTSI switch connector C2.
2. Use the J 39200 DMM in order to test the voltage between the stoplamp/BTSI switch connector C2 terminal A and ground. Refer to Measuring Voltage in Wiring Systems.

Is the voltage within the specified range?

10-15 V

Go to Step 14

Go to Step 13

Repair the open in CKT 275 (LT GRN). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 27

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Connect the J 39200 DMM between the stoplamp/BTSI switch connector C2 terminal A and terminal B. Refer to Measuring Voltage in Wiring Systems.

Is the voltage within the specified range?

10-15 V

Go to Step 16

Go to Step 15

1. Ensure that the stoplamp/BTSI switch is properly adjusted.
2. Ensure that the connector C2 terminals are clean and tight.
3. If the adjustment and the terminals are OK, replace the stoplamp/BTSI switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the repair?

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Go to Step 27

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1. Reconnect the stoplamp/BTSI switch connector C2.
2. Disconnect the shift interlock actuator connector.
3. Use the J 39200 DMM in order to test the voltage between the shift interlock actuator connector terminal A and ground. Refer to Measuring Voltage in Wiring Systems.

Is the voltage within the specified range?

10-15 V

Go to Step 18

Go to Step 17

Repair the open in CKT 1135 (DK GRN/WHT). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 27

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Connect the J 39200 DMM between the shift interlock actuator connector terminal A and terminal B. Refer to Measuring Voltage in Wiring Systems.

Is the voltage within the specified range?

10-15 V

Go to Step 20

Go to Step 19

Repair the open in CKT 50 (BLK) or in CKT 850 (BLK). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 27

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1. Ensure that the shift interlock actuator connector terminals are clean and tight.
2. If the terminals are OK, replace the shift interlock actuator. Refer to Brake Transmission Shift Interlock Solenoid Replacement .

Did you complete the repair?

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Go to Step 27

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1. Turn the ignition switch to the OFF position.
2. Remove the fused jumper.
3. Install the PARK relay.
4. Turn the ignition switch to the RUN position.
5. Connect a Scan Tool and select PZM.
6. Select the PZM DATA function.

Does the PZM indicate that the vehicle is in PARK?

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Go to Step 22

Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 4.0L, 4.6L

1. Turn the ignition switch to the OFF position.
2. Disconnect the PZM connector C2.
3. Connect a fused jumper between the PZM connector C2 terminal C16 and ground. Refer to Using Fused Jumper Wires in Wiring Systems.
4. Turn the ignition switch to the RUN position.
5. Attempt to shift the vehicle out of PARK.

Is the gear shifter locked?

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Go to Step 26

Go to Step 23

Inspect CKT 434 (ORN/BLK) for an open.

Is the circuit OK?

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Go to Step 25

Go to Step 24

Repair the open in CKT 434 (ORN/BLK). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 27

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1. Inspect the PARK relay connector for faulty terminal contact.
2. If the contact is OK, replace the PARK relay.

Did you complete the repair?

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Go to Step 27

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1. Inspect the PZM connector C2 for faulty terminal contact.
2. If the contact is OK, replace the PZM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the repair?

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Go to Step 27

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1. Ensure that any components removed during diagnosis are installed in place.
2. Ensure that all of the connectors are connected.
3. Repeat the system check. Refer to Automatic Transmission Shift Lock Control System Check .

Is the system check complete?

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Go to Automatic Transmission Shift Lock Control System Check

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