Preliminary Inspection

Verify customer complaint by operating suspected system. Visually inspect for obvious signs of mechanical and electrical damage. 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, perform system operation check. See SYSTEM OPERATION CHECK  .

Try the following checks before doing the System Check.

1. If all power windows are inoperative, check circuit breaker "C". If open, check for a short to ground in CKT 76. See WIRING DIAGRAMS  .
2. If windows move slowly, check that:
   • Windows are free of mechanical binding and pivot joints are greased.
   • Battery is fully charged.
   • Ground G200 is clean and tight.
3. If switches do not illuminate when park lamps are turned ON.
4. If the Express Down Feature does not work, but window moves down with each switch depression, replace the Master Power Window Switch Assembly.