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Door Systems Diagnostic System Check

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to 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 BODY CONTROL MODULES - CATERA article.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to establish communication with Body Control Module (BCM). If communication with BCM is established, go to next step. If communication with BCM is not established, diagnose communication concern. See BODY CONTROL MODULES - CATERA article.
  3. Turn ignition switch to RUN position Using scan tool, attempt to establish communication with Memory Seat Module (MSM). If communication with MSM is established, go to next step. If communication with MSM is not established, diagnose communication concern. See BODY CONTROL MODULES - CATERA article.
  4. Using scan tool, select display DTC function for BCM and MSM. Record all displayed DTCs and status of displayed DTCs. If DTCs are displayed, go to next step. If DTCs are not displayed, repair power mirrors by symptom. See POWER MIRRORS INOPERATIVE  under SYMPTOM TESTS.
  5. If scan tool does not display any DTC which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform appropriate test in accordance with DTC retrieved. See BODY CONTROL MODULES - CATERA article.
  6. If scan tool does not display DTCs B1552, B1556 or B1558, go to next step. If scan tool displays DTCs B1552, B1556 or B1558, perform appropriate test in accordance with DTC retrieved. See BODY CONTROL MODULES - CATERA article.
  7. If scan tool does not display DTCs B1973, B1982 or B1983, go to next step. If scan tool displays DTCs B1973, B1982 or B1983, perform appropriate test in accordance with DTC retrieved. See BODY CONTROL MODULES - CATERA article.
  8. If scan tool does not display any DTCs which begin with "P", go to next step. If scan tool displays any DTCs which begin with "P", perform appropriate test in accordance with DTC retrieved. See appropriate SELF-DIAGNOSTIC article in ENGINE PERFORMANCE.
  9. If scan tool displays DTCs B18 or B20, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If scan tool does not display DTCs B18 or B20, repair power mirrors by symptom. See POWER MIRRORS INOPERATIVE  under SYMPTOM TESTS.
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