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Rear defroster does not work on 2007 gmc envoy

Customer Question
rear defroster does not work on 2007 gmc envoy
Submitted: 7 months ago.Category: GMC
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Answered in 6 hours by:
11/13/2017
GMC Mechanic: Peter Bagley, Auto Service Technician replied 7 months ago
Peter Bagley
Peter Bagley, Auto Service Technician
Category: GMC
Satisfied Customers: 1,238
Experience: master tech
Verified

Hello and welcome to just answer, my name is ***** ***** master tech here to help. I cannot see or hear your vehicle so I rely on your patience and input to my questions so I can help you better.I have read your notes and have a question before we proceed.

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GMC Mechanic: Peter Bagley, Auto Service Technician replied 7 months ago

Have you got a circuit tester or multi-meter to do some basic tests ?

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Customer reply replied 7 months ago
i dont have amulti meter or a circuit tester but i will get one today where is the power grid you want me to test ? is it in the tail gate area? i have the tail gate apart so i understand the access
GMC Mechanic: Peter Bagley, Auto Service Technician replied 7 months ago

The power grid is on each side of the defroster lines , it attaches all the lines together, one side will be power the other side ground so you have to check both for appropriate readings. If there is a bad reading such as no power or no ground , the next step would be to check the wiring cord going from the body to inside the tail gat where the connection to the grids are, It may have broken a wire in side that cord from flexing it opening and closing all those years.

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Customer reply replied 7 months ago
Just got finished checking the power grid and checked all wires for breaks . Everything is in good shape . Tested all lines in the window for breaks all is good . As I said in my initial question I changed the module in the tail gate and the one I bought drained the battery. So I put the old one back . Do U know the part number for the module? Are there different part numbers for that module? Here is a picture of the module that came with the car .
GMC Mechanic: Peter Bagley, Auto Service Technician replied 7 months ago

the numbers on the unit should match the replacement or it is wrong. Also if aftermarket I would use just OME when it comes to electronic parts.

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Customer reply replied 7 months ago
Would u suggest a Oem from a dealer or do u know of a web site that I could buy from ?
GMC Mechanic: Peter Bagley, Auto Service Technician replied 7 months ago

E bay some times has deals on OME parts as I purchased an ECU there and was good.

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Customer reply replied 7 months ago
When I look up that part on many oem sites I get an alternate part number if I look on eBay I get used items do u work at dealer to check this out or what cross referencing part that would work
GMC Mechanic: Peter Bagley, Auto Service Technician replied 7 months ago

ours may be different as I am in Canada so what I would recommend is call your closest dealers parts department and they will assist you free of charge to get the proper part number

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Customer reply replied 7 months ago
Ok Im on the road right now I'll check on the way home at the dealer closest to me
GMC Mechanic: Peter Bagley, Auto Service Technician replied 7 months ago

keep me informed

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