One Door Fails To Lock & Unlock From Any Switch
- Lower both front door windows. Turn ignition off and close all doors. Lock and unlock doors from all door lock switches, including door lock key cylinder switches (if equipped with VTSS). Observe door locks. If one door fails to lock and unlock from all switches, go to next step. If symptom is different, go to another symptom test that matches malfunction description. See POWER LOCKS/RKE SYSTEM .
- Remove suspect door trim panel and inspect door lock motor-to-door latch linkage. If linkage is okay, go to next step. If linkage is not okay, repair and/or replace as needed.
- Remove door panel for suspect door lock. Disconnect suspect door lock motor connector and ensure connector is clean and not damaged. Connect a test light between ground and terminal No. 2 (Orange/Black wire) on door lock motor harness connector. Turn ignition switch to ON position with engine off. Using scan tool, actuate door locks while observing test light. If test light illuminates when door locks are actuated, go to next step. If test light does not illuminate, go to step 6.
- Connect test light between ground and terminal No. 1 (Dark Blue/White wire on left front door; Pink/Black wire on all others) on door lock motor harness connector. Using scan tool, actuate door unlock relay while observing test light. On vehicles equipped with Remote Keyless Entry (RKE), if left front door is suspect, use scan tool to actuate left front door unlock relay. On all vehicles, if test light did not illuminate, go to next step. If test light did illuminate, replace door lock motor. See appropriate POWER DOOR LOCKS & TRUNK RELEASE article.
- Locate, but do not disconnect BCM 20-pin connector C5 located at junction block. See Figure. Using a test light, backprobe BCM 20-pin connector C5 suspect terminal. Left front door lock is terminal No. 4 (Dark Blue/White wire), right front door lock is terminal No. 1 (Pink/Light Blue wire), right rear door lock is terminal No. 2 (Pink/Dark Blue wire) and left rear door lock is terminal No. 3 (Pink/Black wire). See CONNECTOR IDENTIFICATION . Using scan tool, actuate door unlock relay while observing test light. On vehicles equipped with Remote Keyless Entry (RKE), if left front door is suspect, actuate left front door unlock relay. On all vehicles, if test light did not illuminate, replace BCM. See BODY CONTROL MODULE (BCM) under REMOVAL & INSTALLATION. If test light did illuminate, replace door lock motor. See appropriate POWER DOOR LOCKS & TRUNK RELEASE article.
- Locate, but do not disconnect BCM 20-pin connector C5 located at junction block. See Figure. Using a test light, backprobe BCM 20-pin connector C5 suspect terminal. Left front door lock is terminal No. 10 (Orange/Black wire), right front door lock is terminal No. 11 (Orange/White wire), right rear door lock is terminal No. 12 (Orange/Tan wire) and left rear door lock is terminal No. 13 (Orange/Brown wire). Using scan tool, actuate door unlock relay while observing test light. If test light did not illuminate, replace BCM. See BODY CONTROL MODULE (BCM) under REMOVAL & INSTALLATION. If test light did illuminate, replace door lock motor. See appropriate POWER DOOR LOCKS & TRUNK RELEASE article.