Power Door Locks - Inoperative
POWER DOOR LOCKS INOPERATIVETEST DESCRIPTION
Steps 1-4:
Steps 5-7:
Steps 8-13:
Steps 14-20:
Steps 21-24:
The numbers below refer to the step numbers on the diagnostic table.
3. This step determines if there is a rear door lock actuator control circuit shorted to ground. This condition could open the RDM fuse located in the rear fuse block and set a DTC U1162 current when the rear door lock actuator is actuated.
4. This step determines if the door modules recognize the lock switch inputs. However, if the lock switch ground circuit has failed, the scan tool could still display switch inputs transitioning to Lock and Unlock as if there were no failure. This is due to the fact that the lock switch can find an alternate path to ground through the switch illumination circuit when the headlamps are turned Off. By turning the headlamps On in this step, the possibility of overlooking an open lock switch ground circuit as the cause of the malfunction is eliminated.
7. This step determines if the door lock actuator unlock control circuit is the cause of the malfunction.If the test lamp is already illuminated before operating the lock switch to Unlock, test the door lock actuator unlock control circuit for a short to battery voltage.
8. This step determines if the door lock actuator lock control circuit is the cause of the malfunction.If the test lamp is already illuminated before operating the lock switch to Lock, test the door lock actuator lock control circuit for a short to battery voltage.
16. This step directs you to, either inspect for poor connections at the passenger door module, or, at the driver door switch assembly as a pre-requisite to replacing the passenger door module or driver door switch assembly. This is because lock switch signals for the driver door are detected and processed by the driver door switch assembly, while lock switch signals for the passenger door are detected and processed by the passenger door module.
21. This step directs you to, either replace the passenger door module or driver door switch assembly. This is because lock switch signals for the driver door are detected and processed by the driver door switch assembly, while lock switch signals for the passenger door are detected and processed by the passenger door module.