Question about 1993 Pontiac Trans Sport

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Front wipers will quit, then restart once unit is cool. Is there a wiper relay? and where is it? 1993 pontiac transport

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Typically a relay would not cause this problem. My assumption would be that it is the actual motor of the wipers. However, the relays should be located right where the fusebox or may be on the passenger side under the hood. When you pull off the cover you should be able to see a relay labeled wipers. You can try replacing the relay to see if it gets fixed. However, I believe it is the actual motor.

Good luck

Posted on May 26, 2011


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On 2008 gmc arcadia my front wipers quit working at all. Any suggestions? Where is fuse for front wipers?

WPR/WSW fuse 25amp is located in the under hood fuse box . This a complex system ,controlled by the BCM . If you find that the fuse is good i suggest you take it to a qualified repair shop . This wiper / washer system has the capability to set DTC'S - diagnostic trouble codes !
DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
The Body Control Module (BCM) monitors the control circuit of the WIPER relay. The voltage level should be low while the WIPER relay is de-energized and near system voltage when the relay is energized. After the BCM receives a low, intermittent, or mist signal from the wiper/washer switch, it responds by applying battery voltage through the WIPER relay control circuit to the coil side of the relay, energizing the WIPER relay.
DTC B3873 00: Front Washer Relay Circuit
DTC B3875 00: Wiper High Speed Relay Circuit
DTC B3922 00: Front Wiper Function Select Circuit
I really don't think this is a fuse problem , but if it is a blown fuse they don't just blow for no reason . Low resistance high current flow ,short to ground .
The wiper / washer switch is a input to the BCM - body control module . Depending on switch position the BCM will energize a relay the WPR relay or the WPR HI relay .

Jun 25, 2017 | GMC Cars & Trucks

1 Answer


In the under hood fuse box , should have diagram inside the lid . Front wiper's or rear ? Front fuse # 36 - 25 amp. Plus Two relay's PCB hi and Wiper PCB relay . Wouldn't think this being fuse problem . Wiper switch , motor etc... The wiper's are control by a computer . BCM - body control module .

The windshield wiper/washer system consists of front and rear wipers. The front and rear wipers are operative when the vehicle is in accessory or run. The front wipers have 4 different modes: Mist, Intermittent, Low, and High. When the front wipers are in the intermittent mode, there are 5 delay modes to chose from, commanded by the windshield wiper washer switch through the body control module (BCM). The rear wipers has an only one mode.

If the fuse is bad , could have a short to ground or wiper motor pulling to much current (amps) . Fuse's don't just blow for no reason ! Could also have DTC'S - diagnostic trouble codes stored in the BCM .
DTC B3715
DTC B3873
DTC B3875
DTC B3922

DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
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 BCM controls the windshield wiper motor through two output controls, controlling two different PCB relays which control the desired wiper speed, high or low.
DTC B3922 00: Front Wiper Function Select Circuit

The PCB relay's are non- servicable , replace fuse box . Soldered in Your best bet mit be to take it to a qualified repair shop .

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1 Answer

Why does the front windshield wipers on my pontiac transport only work on the highest setting?

hi Christina, the most likely cause is that the contacts in the wiper switch itself are worn out.

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The headlamps/wipers are most likely the multifunction switch, on the steering column side. This is a combination switch for the wipers and headlamps. The removal of steering wheel/airbag need to be accomplished. This should be performed by a professional.
There are 2 cooling fans, you need to verify which one, there is a large connector to fan, verify if you are getting power at the fan motor to determine what is the faulty unit. They are relativly easy to change, the fan and motor will come out as an assembly. .

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