Preliminary Inspection
Verify customer complaint by operating suspected system. Visually inspect for obvious signs of mechanical or electrical damage. Inspect for blown fuses. See Fig 1 and Fig 2 . Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for 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 problem is found, repair as necessary. If no problem is found, perform self-diagnostics. See SELF-DIAGNOSTIC SYSTEM .