Tailgate Lock Inoperative

*TAILGATE LOCK INOPERATIVE





For a complete wiring diagram refer to Diagrams/Electrical.





1. CHECK DTC'S PRESENT

With the scan tool, read DTCs.

Are there any Tailgate related codes present?

Yes

- Refer to symptom list for problems related to POWER DOOR LOCKS/RKE.

No

- Go To 2

2. CHECK TAILGATE LOCK MOTOR





Disconnect the Tailgate Lock Motor connector.

Connect a test light between the Tailgate Lock Driver circuit and the Tailgate Unlock Driver circuit in the Lock Motor connector.

With the scan tool actuate the UNLOCK TAILGATE.

With the scan tool actuate the LOCK TAILGATE.

Did the test light illuminate when the motor was actuated in both directions?

Yes

- Replace the Tailgate Lock Motor.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 3

3. CHECK (P30) TAILGATE LOCK DRIVER CIRCUIT FOR AN OPEN





Turn the ignition off.

Connect a jumper wire between (P30) Tailgate Lock Driver circuit and the (G910) Tailgate Switch Ground in the Tailgate Lock Motor connector.

Disconnect the Junction Block C2 connector.

Measure the resistance between ground and the (P30) Tailgate Lock Driver circuit in the Junction Block C2 connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 4

No

- Repair the (P30) Tailgate Lock Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. CHECK (P31) TAILGATE UNLOCK DRIVER CIRCUIT FOR AN OPEN





Connect a jumper wire between (P31) Tailgate Unlock Driver circuit and the (G910) Tailgate Switch Ground in the Tailgate Lock Motor connector.

Measure the resistance between ground and the (P31) Tailgate Unlock Driver circuit in the Junction Block C2 connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the (P31) Tailgate Unlock Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

5. CHECK (P30) TAILGATE LOCK DRIVER CIRCUIT FOR A SHORT TO GROUND





Disconnect the Jumper wire installed in the previous step.

Measure the resistance between ground and the (P30) Tailgate Lock Driver circuit in the Junction Block C2 connector.

Is the resistance below 1000.0 ohms?

Yes

- Repair the (P30) Tailgate Lock Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 6

6. CHECK (P31) TAILGATE UNLOCK DRIVER CIRCUIT FOR A SHORT TO GROUND





Measure the resistance between ground and the (P31) Tailgate Unlock Driver circuit in the Junction Block C2 connector.

Is the resistance below 1000.0 ohms?

Yes

- Repair the (P31) Tailgate Unlock Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 7

7. CHECK JUNCTION BLOCK (P30) TAILGATE LOCK DRIVER CIRCUIT FOR AN OPEN





Remove the Junction Block.

Remove the Body Control Module from the Junction Block.

Measure the resistance of the (P30) Tailgate Lock Driver circuit between Junction Block C2 connector and the Junction Block - BCM connector.

Is the resistance below 1.0 ohm?

Yes

- Go To 8
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Junction Block.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

8. CHECK JUNCTION BLOCK (P31) TAILGATE UNLOCK DRIVER CIRCUIT FOR AN OPEN





Measure the resistance of the (P31) Tailgate Unlock Driver circuit between Junction Block C2 connector and the Junction Block - BCM connector.

Is the resistance below 1.0 ohm?

Yes

- Replace the Body Control Module.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Junction Block.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test