Preliminary Checks

Verify customer complaint by operating suspected system. Visually inspect for obvious signs of mechanical and electrical damage. Battery voltage must be at least 10.5 volts. Inspect for blown fuses and damaged relays. 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, repair by symptom.