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Test A: Lighting System Faults

  1. If lighting system diagnostic system check has been performed, go to next step. If lighting system diagnostic system check has not been performed, perform lighting system diagnostic system check. See LIGHTING SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Operate suspect system. If system does not operate properly, go to next step. If system operates properly, system is okay.
  3. Ensure any aftermarket electronic equipment is properly installed. Visually inspect easily accessible or readily visible system components for obvious signs of electrical and/or mechanical damage which could cause symptom. If no fault is found, go to next step. If fault is found, repair as necessary and retest system operation.
  4. Check for, loose or corroded connections, or damaged wiring harnesses which could cause an intermittent fault. Pay special attention to harness routing where wires are hinged or make sharp bends. If fault is not found, go to next step. If fault is found, repair as necessary and retest system operation
  5. Use appropriate wiring diagram in appropriate article for lighting system involved and check ground and power feed circuits for proper values. If fault is not found, return to step  1 . If fault is found, repair as necessary and retest system operation.
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