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Lighting System Diagnostic System Check

  1. Ensure ignition switch is in OFF position. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, see TEST B: SCAN TOOL INOPERATIVE  under SYSTEM TESTS.
  2. Turn ignition switch to ON position. Attempt to establish communications with BCM. If scan tool communicates with BCM, go to next step. If scan tool does not communicate with PCM, see TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Select BCM display DTCs function on scan tool. If DTCs are displayed, go to next step. If no DTCs are retrieved, repair by symptom. See appropriate wiring diagram article. Repair as necessary.
  4. If scan tool displays DTCs which begin with "U", see TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS. If any other DTCs are displayed, go to next step.
  5. Repair as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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