Preliminary Inspection
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Verify customer complaint by operating suspected system. Ensure battery is fully charged and passes load test. See BATTERY TESTING & INSPECTION under ON-VEHICLE TESTING. Visually inspect for obvious signs of mechanical and electrical damage. Inspect for blown fuses. See COMPONENT LOCATIONS . Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary. If no fault is found, perform self-diagnostics. See SELF DIAGNOSTIC SYSTEM .