Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Test
- LIFTGATE LATCH INOPERATIVE
- Turn the ignition off.
- Disconnect the Tailgate Latch connector.
- Connect a test light between the (P304) Tailgate Lock Driver circuit and the (P406) Tailgate Unlock Driver circuit.
- Close the front doors or trip the front door latches to the closed position.
- Operate the door locks in both positions and observe the test light.
Does the test light illuminate brightly for approximately 300 ms. when the door locks are actuated?
Yes
- Replace the Liftgate Latch.
- Perform the BODY VERIFICATION TEST. Refer to Standard Procedure .
No
- Go To 2.
- (P306) TAILGATE UNLOCK DRIVER CIRCUIT OPEN
- Disconnect the TIPM C5 connector.
- Measure the resistance of the (P306) Tailgate Unlock Driver circuit between the Latch connector and the TIPM C5 connector.
Is the resistance below 2.0 ohms?
No
- Repair the (P306) Tailgate Unlock Driver circuit for an open.
- Perform the BODY VERIFICATION TEST. Refer to Standard Procedure .
Yes
- Go To 3.
- (P306) TAILGATE UNLOCK DRIVER CIRCUIT SHORT TO GROUND
- Measure the resistance between Ground and the (P306) Tailgate Unlock Driver circuit.
Is the resistance below 1, 000 ohms?
Yes
- Repair the (P306) Tailgate Unlock Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Refer to Standard Procedure .
No
- Go To 4.
- Measure the resistance between Ground and the (P306) Tailgate Unlock Driver circuit.
- (P304) TAILGATE LOCK DRIVER CIRCUIT OPEN
- Disconnect the TIPM C6 connector.
- Measure the resistance of the (P304) Tailgate Lock Driver circuit between the TIPM C6 connector and the Tailgate Latch connector.
Is the resistance below 2.0 ohms?
Yes
- Go To 5.
No
- Repair the (P304) Tailgate Lock Driver circuit for an open.
- Perform the BODY VERIFICATION TEST. Refer to Standard Procedure .
- (P304) TAILGATE DOOR LOCK DRIVER CIRCUIT SHORT TO GROUND
- Measure the resistance between Ground and the (P304) Tailgate Lock Driver circuit.
Is the resistance below 1, 000 ohms?
Yes
- Repair the (P304) Tailgate Lock Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Refer to Standard Procedure .
No
- Replace the Totally Integrated Power Module in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. Refer to Standard Procedure .
- Measure the resistance between Ground and the (P304) Tailgate Lock Driver circuit.
NO RELATED
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.