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Ask Gm Tech (Cam) Your Own Question
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1667
Experience:  GM Grand Master Technician 2007. 14 year experience.
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On my 2005 envoy the rear wiper and defrost and fobs work

Customer Question

On my 2005 envoy the rear wiper and defrost and fobs work intermitantly it seems there is a short garage says the module doesn't communicate can't find ground
Submitted: 24 days ago.
Category: GMC
Expert:  Gm Tech (Cam) replied 24 days ago.

Welcome. I am Cam.
Let me get that info for you. While I look that up, have you checked the wiring in the boot that runs from the body to theliftgate itself? That were can break from usage.

Customer: replied 24 days ago.
looks fine
Customer: replied 24 days ago.
I found out it will work for a while u don't touch the vehicle minutes later it doesn't work
Expert:  Gm Tech (Cam) replied 24 days ago.

Ok, the ground is located under the trim on the right rear of the cargo compartment.
IF the wiring is good, then its possibly the module itself. They are prone to issues and corrosion.

Customer: replied 24 days ago.
I was at a fm dealership with two modules he said the module was good but it said it couldn't communicate
Expert:  Gm Tech (Cam) replied 24 days ago.

Ok, so if it will not communicate, we need to check 3 things

Data line.
If any of those are out, then this would be the result. Did they do any of those checks? ?

Customer: replied 24 days ago.
ER rear passenger side
Expert:  Gm Tech (Cam) replied 24 days ago.

I Am not sure what your asking in your last reply.

Customer: replied 24 days ago.
He was checking the module but he was an ass which side pas or dr rear
Expert:  Gm Tech (Cam) replied 24 days ago.

Right is Passengers side.

Customer: replied 24 days ago.
Customer: replied 24 days ago.
Wires donor go to passenger side they go drivers side
Expert:  Gm Tech (Cam) replied 24 days ago.

The wiring goes down the drivers side and back to the passengers side. Its callout #3 in the picture. Check #9 as well on the drivers side.

Customer: replied 21 days ago.
Does the rear latch act as a ground? Also I heard orange wire at top lift gate could be problem my tech says module is not communicating which plug into module is the data line
Expert:  Gm Tech (Cam) replied 20 days ago.

The latch does not act as a ground, there is a different ground.
Yes the wiring to the module, orange being power can be an issue, corrosion or breaks in the wiring causing this.

Customer: replied 19 days ago.
Which plug going to module would be data wires power goes to the module the back latch moves when plunging and unplugging first plug
Customer: replied 19 days ago.
I disconnected both grounds and fobs worked for a while then stopped working
Expert:  Gm Tech (Cam) replied 19 days ago.

Its the 8 pin black connector, small light blue wire.