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Lighting System Diagnostic System Check

  1. Connect scan tool to Data Link Connector (DLC). See Figure . DLC is located under left side of instrument panel. If scan tool powers up, go to next step. If scan tool does not power up, perform TEST B: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition switch to ON position. Using scan tool, attempt to communicate with Body Control Module (BCM). If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, perform TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Select DISPLAY DTCS function on scan tool for BCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair by symptom as necessary. See appropriate article in WIRING DIAGRAMS.
  4. If scan tool displays any DTCs which begin with a "U", perform TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS. If scan tool does not display any DTCs which begin with a "U", go to next step.
  5. Perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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