*TAILGATE LOCK INOPERATIVE
For a complete wiring diagram Refer to Section 8W.
| Possible Causes |
| DTC'S PRESENT |
| (P30) TAILGATE LOCK DRIVER OPEN |
| (P30) TAILGATE LOCK DRIVER SHORT TO GROUND |
| (P31) TAILGATE UNLOCK DRIVER OPEN |
| (P31) TAILGATE UNLOCK DRIVER SHORT TO GROUND |
| TAILGATE LOCK MOTOR OPEN |
| JUNCTION BLOCK OPEN |
| BODY CONTROL MODULE - TAILGATE DRIVER OPEN |
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 To2
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To3
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 To4
No
- Repair the (P30) Tailgate Lock Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
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 To5
No
- Repair the (P31) Tailgate Unlock Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To6
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To7
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace the Junction Block in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
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 in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace the Junction Block in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)