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Door Systems Diagnostic System Check

  1. Connect scan tool to Data Link Connector (DLC). DLC is located under instrument panel, right of steering column. If scan tool powers up, go to next step. If scan tool does not power up, perform appropriate diagnostic procedure. See SELF-DIAGNOSTIC SYSTEM in appropriate BODY CONTROL MODULES article.
  2. Turn ignition switch to RUN position. Attempt to establish communication with Body Control Module (BCM). If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, diagnose communication problem. See appropriate BODY CONTROL MODULES article.
  3. Select display DTC function for BCM. If scan tool displays DTCs, go to next step. If no DTCs are displayed, diagnose by symptom. See SYSTEM TESTS  .
  4. If scan tool does not display DTCs that begin with "U", go to next step. If scan tool displays DTCs that begin with "U", diagnose communication problem. See appropriate BODY CONTROL MODULES article.
  5. If scan tool does not display DTCs B1000 or B1001, go to next step. If scan tool displays DTCs B1000 or B1001, diagnose body control system. See appropriate BODY CONTROL MODULES article.
  6. If scan tool does not display DTCs B1369, B1374 or B1379, go to next step. If scan tool displays DTCs B1369, B1374 or B1379, diagnose body control system. See appropriate BODY CONTROL MODULES article.
  7. If scan tool does not display DTCs that begin with "P", go to next step. If scan tool displays DTCs that begin with "P", diagnose appropriate system for DTC retrieved. See appropriate BODY CONTROL MODULES article.
  8. If scan tool displays DTC B3127, B3128, B3132, B3133, B3137 or DTC B3138, diagnose appropriate system for DTC retrieved. See appropriate POWER DOOR LOCKS & REMOTE KEYLESS ENTRY SYSTEMS article. If scan tool does not display DTC B3127, B3128, B3132, B3133, B3137 or B3138, diagnose by symptom. See SYSTEM TESTS  .
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