Door Unlock Relay Control Circuit Open Or Shorted To Ground

Monitored & Set Condition

When Monitored: With ignition On.
Set Condition: The BCM detects a low circuit on the Door Unlock Relay Control circuit even though it is not attempting to unlock the doors for more than 5 seconds. If the BCM is not grounding its side of the relay coil, the output should be high.

Possible Causes:

Relay Open Or Shorted
Code Active
Junction Block - Door Unlock Relay Control Short To Ground
Junction Block - Door Unlock Relay Control Open
Body Control Module - Open Or Shorted

Testing

Turn the ignition on. With the DRBIII(R), erase DTCs. Operate the door locks several times. With the DRBIII(R), read DTCs. Does the DRBIII(R) display DOOR UNLOCK RELAY CONTROL CIRCUIT OPEN/SHORT TO GROUND? If yes, go to next step. If no, problem is intermittent and not present at this time. Inspect the wiring and connectors and repair as necessary. Ensure the relay is completely plugged in. Perform BODY VERIFICATION TEST .
Remove the Door Unlock Relay from the Junction Block. Install a substitute relay in place of the Door Unlock Relay. With the DRBIII(R), erase DTCs. Operate the Door Locks several times. With the DRBIII(R), read DTCs. Does the DRBIII(R) display DOOR UNLOCK RELAY CONTROL CIRCUIT OPEN/SHORT TO GROUND? If yes, go to next step. If no, replace the original relay. Perform BODY VERIFICATION TEST .
Turn the ignition off. Remove the Door Unlock Relay from the Junction Block. Remove the Body Control Module from the Junction Block. Ensure the remaining Junction Block connectors are reconnected. Measure the resistance between ground and the Door Unlock Relay Control circuit in the relay connector of the Junction Block. Is the resistance below 100.0 ohms? If yes, replace the Junction Block. Perform BODY VERIFICATION TEST . If no, go to next step.
Measure the resistance of the Door Unlock Relay Control circuit between the Relay connector and the Junction Block BCM connector. Is the resistance below 2.0 ohms? If yes, go to next step. If no, replace the Junction Block. Perform BODY VERIFICATION TEST .
If there are no possible causes remaining, replace the Body Control Module. Perform BODY VERIFICATION TEST .