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Windsheild wipers


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specbikes
New User

Dec 24, 2013, 4:46 PM

Post #1 of 4 (1118 views)
Windsheild wipers Sign In

2008 GMC Sierra 4.8 135,000 miles .Windshield wipers quit after ice storm. Mechanic ran tests. He says not fuse, wiring, wiper motor or switch. Says possibly under hood fuse box


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 24, 2013, 5:06 PM

Post #2 of 4 (1109 views)
Re: Windsheild wipers Sign In

I sure don't know how he eliminated all those things and ended up blaming the fuse box. The wipers are ultimately controlled by the Body control module. The selection of speeds are done through a single wire after the switch selects a number of resisters that varies the voltage signal going to the BCM on that wire. the BCM identifies what speed is requested by reading the voltage on that line and then activates the motor accordingly. In order to diagnose this problem you are going to need a professional, high end scan tool and someone that really knows how to use it to troubleshoot the problem.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



DanD
Veteran / Moderator
DanD profile image

Dec 25, 2013, 3:26 AM

Post #3 of 4 (1091 views)
Re: Windsheild wipers Sign In

X2

Canadian "EH"






kev2
Veteran
kev2 profile image

Dec 26, 2013, 9:21 AM

Post #4 of 4 (1059 views)
Re: Windsheild wipers Sign In

Merry Christmas -

It seams something is missing in your post- some information maybe,
But I agree that your 'mechanic' should NOT be lost in this repair.






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