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Lighting System Diagnostic System Check

  1. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. See Figure . Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST G: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition switch to RUN position. Try to establish scan tool communication with Body Control Module (BCM). If communication with BCM is established, go to next step. If communication with BCM is not established, go to TEST F: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Select DISPLAY DTC function for BCM. Record all displayed DTCs and status of displayed DTCs. If any DTCs are displayed, go to next step. If no DTCs are displayed, attempt to diagnose system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  4. If scan tool does not display any DTCs that begin with "U", go to next step. If scan tool displays any DTCs that begin with "U", go to TEST F: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  5. If scan tool does not display DTC B1000, go to next step. If scan tool displays DTC B1000, perform DTC B1000: ECU MALFUNCTION IN BODY CONTROL SYSTEM  under DIAGNOSTIC TESTS.
  6. If scan tool displays DTCs C1294 or C1295, perform appropriate test. See appropriate ANTI-LOCK article in BRAKES. If scan tool does not display DTCs C1294 or C1295, perform appropriate TEST in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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