Power Door Locks Inoperative - All Doors and Switches

Power Door Locks Inoperative - All Doors and Switches

Diagnostic Aids

A short to ground in any door lock or unlock control circuit will most likely open the 15-amp DR LK/TRUNK fuse located in the instrument panel (I/P) fuse block and cause all door lock functions to become inoperative. However, if the lock or unlock control circuit is shorted to ground and the DR LK/TRUNK fuse does not open, the most likely affect will be that all door locks will be inoperative in one direction, i.e. if the unlock control circuit is shorted to ground, all doors may lock, but will not unlock, or, if the lock control circuit is shorted to ground, all doors may unlock, but will not lock.

Test Description

Step 1 - Step 14:

The numbers below refer to the step numbers on the diagnostic table.
4. This step determines if the malfunction may be caused by a short to ground in the battery positive voltage circuit of the body control module (BCM). The BCM provides the voltage needed to power all door lock actuator control circuits. A short to ground in the battery positive voltage circuit of the BCM will open the DR LK/TRUNK 15-amp fuse in the I/P fuse block and cause all door lock functions to become inoperative.
While following the steps of this procedure, be sure you are testing the battery voltage circuit of the BCM that is associated with the door lock system. Use the door lock actuator schematics at the front of the doors section in order to correctly identify the appropriate circuit.
6. This step determines if the malfunction may be caused by an open in the battery positive voltage circuit of the BCM. The BCM provides the voltage needed to power all door lock actuator control circuits. An open in the BCM battery positive voltage circuit of the BCM will cause all door lock functions to be inoperative.
While following the steps of this procedure, be sure you are testing the battery voltage circuit of the BCM that is associated with the door lock system. Use the door lock actuator schematics at the front of the doors section in order to correctly identify the appropriate circuit.
7. This step determines if the malfunction may be caused by an open in the ground circuit of the BCM. The BCM provides the ground path for all door lock actuator control circuits.
While following the steps of this procedure, be sure you are testing the ground circuit of the BCM that is associated with the door lock system. Use the door lock actuator schematics at the front of the doors section in order to correctly identify the appropriate circuit.