B1033-72
B1033-72-DOOR LOCKS - SIGNAL STUCK LOW
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The three door lock relays (lock, driver door unlock and passenger door unlock) are internal to the Body Control Module. If one relay is stuck, the central locking system is inoperative. If one is stuck and cannot be freed, the BCM would have to be replaced.
- When Monitored:
Whenever the module is awake.
- Set Condition:
When one of the door lock relays is stuck low, this code will set.
1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase the DTCs.
3. Close all doors and try to operate the door locks several times.
4. Wait 30 seconds.
5. With the scan tool, read the DTCs.
Does the scan tool display; B1033-72-DOOR LOCKS - SIGNAL STUCK LOW?
Yes
- Go To 2
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension. If the problem ever returns, replace the Body Control Module. Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
2. ACTUATE DOOR LOCK/UNLOCK RELAYS
1. Be sure the doors are still closed (or trip the door latch - Closed).
2. With the scan tool, actuate the Lock Doors Command one time.
3. With the scan tool, actuate the Passenger Door Unlock one time.
4. With the scan tool, actuate the Driver Door Unlock one time.
5. Repeat the previous steps three times.
6. With the scan tool, record and erase the DTCs.
7. Operate the door locks several times.
8. Wait 30 seconds.
9. With the scan tool, read the DTCs.
Does the scan tool display; B1033-72-DOOR LOCKS - SIGNAL STUCK LOW?
Yes
- Replace the Body Control Module. Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Test complete.
- Perform the BODY VERIFICATION TEST. Body Verification Test.