Question about 1998 GMC Safari

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Why does the wiper blades all of sudden work only on high. Doesn't do anything else on other levels of speed. (98 gmc safari). Is this a wiper motor problem or is it the module inside?

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You likely need a wiper motor,the motor works but the slip rings inside the gear housing are not contacting and i do not know of any place these can be bought.

Posted on Nov 19, 2009

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Module

Posted on Nov 19, 2009

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I'm driving in rain, wipers working good, all of a sudden they quit! I drive for 15 min, check again, they work for a while, then quit again...what in the problem?


If your not familiar with automotive electronics an module control of components , I suggest you take it to the dealer . They have the tools to diagnose this type problem !
The Wiper/Washer System consists of the following components:
?€¢
Windshield wiper/washer switch


?€¢
Body control module (BCM)


?€¢
Wiper PCB relay


?€¢
Wiper high PCB relay


?€¢
Windshield wiper motor


?€¢
Windshield washer fluid pump


?€¢
Windshield washer fluid level switch


?€¢
WPR fuse 25 A


?€¢
WSW fuse 10 A


Low Speed Operation
When the wiper switch is in the low speed position, ground is applied through the switch internal resistor and the wiper switch low signal circuit to the body control module (BCM). In response to this signal, the BCM energizes the WIPER PCB relay by applying battery voltage through the wiper relay control circuit to the coil side of the relay. This allows battery positive voltage from the WPR fuse to flow through the switch input side of the WIPER PCB relay and out to the switch input side of the WIPER HIGH PCB relay. Since the wiper high relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the windshield wiper motor, the motor will operate at low speed.
High Speed Operation When the wiper switch is in the high speed position, ground is applied through the windshield wiper switch high signal circuit to the body control module (BCM) indicating the wiper high speed request. In response to this signal, the BCM then energizes the wiper PCB relay, as stated above, and the wiper high PCB relay by applying ground through the control circuit to the coil side of the relay. With the wiper high relay energized and its switch contacts closed to the high speed control circuit of the wiper motor, the motor will operate at high speed.
Wiper motor high speed operation and the wiper high speed PCB relay can also be commanded ON/OFF by using a scan tool. Refer to Control Module References.
DTC B3715 02: Front Wiper Relay Drive Circuit Short to Ground
DTC B3875 00: Wiper High Speed Relay Circuit
DTC B3922 00: Front Wiper Function Select Circuit
You could Have a switch problem , BCM problem ,PCB relay problem , the pcb relays are non serviceable an the whole under hood fuse box would need to be replaced . Malfunctioning motor bad ground some where etc.....

Dec 20, 2015 | 2008 Chevrolet Impala

1 Answer

1999 gmc safari van wipers wont work


check fuse, then run a ground wire to the wiper motor and ensure the ground is good. if the wipers start to work then the motor just needs a permanent ground connected to it. if it doesn`t work then check for power at the motor if you have power then tap the motor with a hammer to see if it starts if so then the motor is bad.

Mar 10, 2015 | 1999 GMC Safari

1 Answer

The windshield wipers only work when they want to in my 1997 GMC Safari van.


these have had problems with the wiper motor having a bad ground.take a jumper wire and run it from a good ground to the body of the wiper motor.if this doesn`t help then with the wipers on(hopefully not working at the time)take a hit the motor and see if it starts to work.if it does then the motor has a bad spot in it(like a bad starter) and will need to be replaced.

Mar 23, 2011 | GMC Safari Cars & Trucks

2 Answers

Windsheld wipers work intermittently. turn


the wiper motor seems to be defective, test that first

Jul 04, 2010 | 1998 GMC Safari

1 Answer

1985 gmc k1500 wipers only move at 1 slow spped, interminttent doesnt work at all. How fast is fast and why is fast not working?


Slow is the same speed as 'mist'. Mist is when you twist the control arm backwards to induce a single swipe. If you hold it, you will run the wipers in low speed. Fast is faster than that. Probably by 30% or more.

Turn the wipers on high speed. Wiggle the connector at the wiper motor. If the wipers run sporadically as you wiggle the connector, you either have a bad connector or a bad circuit board on the wiper motor.


Jan 15, 2010 | 1985 GMC K1500

1 Answer

Need to replace old wiper motor.


Autozone Chilton manual 10.00 step by stepinfo.

Oct 03, 2009 | 2001 GMC Safari

1 Answer

GMC Safari 2000 blower motor works only on high speed. how can i


you ahould be able to purchase that at any parts store. they are easy to install

Sep 09, 2009 | 2000 GMC Safari

1 Answer

Safari start problem


my friend recently obtained a gmc safari. he knows minimal about cars let alone a gmc. can anyone out there tell me where the fuses are located for the wiper blades. thanks

Nov 27, 2008 | 1999 GMC Safari

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