Question about 1999 Chevrolet Silverado 1500
Hello my name is Ben. If you have plenty of fluid in the washer reservoir and all fuses are good your next step is to check for power at the windshield washer pump. Place the transmission in Park, set the parking brake and chock at least one rear wheel. Slightly loosen the front driver's side lug nuts and then jack up that side. Support the vehicle with a jack stand. Now remove the wheel and fender well liner to gain access to the washer pump. With a 12 volt test light check for voltage while someone operates the washer. If voltage is present, you probably have a bad washer pump. If no voltage is present then you will need to trace the wiring back to the problem. Hopefully you find a bad wire before the switch.
Posted on Aug 28, 2010
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Posted on Jan 02, 2017
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Windshield wiper system module / motor
Windshield washer fluid pump
Windshield washer fluid level switch
Instrument panel cluster (IPC)
ACC 15-amp fuse
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Body control module (BCM)
Wiper 1 relay
Wiper 2 relay
Windshield wiper motor
Windshield washer pump
Windshield washer nozzles
Windshield washer solvent container
Windshield wiper arm and blade assemblies
Windshield wiper transmission
WIPER/SW 10A fuse
WIPER 25A fuse
The body control module (BCM) controls the wiper motor based on input from the windshield wiper washer switch. The BCM monitors the wiper washer switch through three separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windshield washer switch signal circuit is used to determine washer operation. The windshield wiper motor park operation is controlled by the BCM. The BCM recieves an input from the park switch to determine wiper blade position. When the wiper blades are at the bottom of the windshield glass in park position the wiper park switch will open and the circuit will be pulled up to B+ by the BCM. The park signal will be pulled to ground by the wiper motor park switch while the wiper blades are not in the park position.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low
Diagnostic Trouble Codes (DTCs)
The body control module (BCM) monitors the voltage on the windshield wiper switch signal 2 circuit for diagnostic purposes. If the circuit is shorted to voltage while the driver is commanded OFF, the BCM will store DTC B3715. If the circuit is shorted to ground while the driver is commanded ON, the BCM will store DTC B3715. Refer to DTC B3715.
It would be best to have a factory scan tool to diagnose this problem . it would make it easier anyway .
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