Preliminary Inspection

Check circuit breaker 25 by operating the sunroof (if equipped). If circuit breaker 25 is open check for a short to ground. If express down function does not operate, but window operates, check for battery voltage at terminal "A" of express down window module connector and check DK BLU (164) wire from terminal "C" of express down module to S526 for an open. See WIRING DIAGRAMS  . If both checks okay, replace express down window module. If fault is found, repair as necessary. If no fault is found, perform system operation check. See SYSTEM OPERATION CHECK  .