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Just bought a 2014 GMC Sierra. Regular cab, work truck model…

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Just bought a 2014 GMC...
Just bought a 2014 GMC Sierra. Regular cab, work truck model with 6.0 gas engine. Having power window issues
Submitted: 6 months ago.Category: GMC
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Answered in 5 minutes by:
11/7/2017
GMC Mechanic: xsvectOR, ASE Certified Technician replied 6 months ago
xsvectOR
xsvectOR, ASE Certified Technician
Category: GMC
Satisfied Customers: 17,070
Experience: car expert!
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what type of issue?

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Customer reply replied 6 months ago
It's not your normal bad switch issue. I thought it was but its not!
Driver door switch will roll driver door window up and down - no issue
Passenger door switch will roll passenger window up and down - no issue
Driver door switch will roll passenger window down but NOT back upAlready replaced driver master switch with known good one. Problem persists.
Swapped passenger door switch with a known good one. Problem persists.
Removed and replaced 25A circuit breaker for power windows. - problem persists.THEN tested for power at passenger switch while operating the passenger switch to see what wire has power while rolling window up from passenger side. It was brown wire iirc.
So went to driver side switch and supplied power to brown wire at back of switch. Well after doing that now the DRIVER window will roll down and will not roll back up and the passenger window now works going both up and down from either switch!
Customer reply replied 6 months ago
I am not a novice and have professional diagnostic tools at my disposal. Power probe, Dvom and a fully updated Autel handheld diagnostic scanner. A simple schematic of the complete circuit may fulfill my needs!
GMC Mechanic: Lou P., ASE Certified Technician replied 6 months ago
Lou P.
Lou P., ASE Certified Technician
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Satisfied Customers: 5,893
Experience: I Have knowledge in almost all car lines and can help with general questions and more!!!!!
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Hello my name is ***** ***** I will do my best to help you. I am looking over your info now and will reply back soon with some info , thanks!

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Customer reply replied 6 months ago
Thank you. I'm outside the shop now but would love to have a schematic put in front of me to try and resolve this issue.
GMC Mechanic: Lou P., ASE Certified Technician replied 6 months ago

ok, i dont think a schematic is going to help, i feel this will be a software issue of some sort, the newer trucks dont work off of simple power and ground it is all control modules and signals, but im pullin up a diagram now.

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GMC Mechanic: Lou P., ASE Certified Technician replied 6 months ago

see if the autel can access the drivers door module

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Customer reply replied 6 months ago
I know that I can access the driver door module with the scantool but am not in the shop with the truck currently. I will be back there at 6:30 tomorrow morning
Customer reply replied 6 months ago
Will you be available at that time? What are you thinking I should be looking for while accessing the driver door module?
GMC Mechanic: Lou P., ASE Certified Technician replied 6 months ago

ok, i will be available tomorrow if you want to pick this up then.

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GMC Mechanic: Lou P., ASE Certified Technician replied 6 months ago

we need to verify that the scanner can see the window switches being operated up and down.

if we can verify the switch is working then something is stopping operation.

when did the issue occur?

was the battery disconnected?

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Customer reply replied 6 months ago
Battery was dead when I picked the truck up from auction. Had to jump start it to get it home. I have driven it for a week and haven't had to jump start it since the initial pickup. the truck has had the problem since being in my possession. My autel should have various "re-learn" procedures, is that what you think we may be looking at?
GMC Mechanic: Lou P., ASE Certified Technician replied 6 months ago

that is what i think we may be looking at, if not a program for the switches.

the switches are the modules, and they communicate, so if the window operates one way, the communication is ok, if the changing of the switch did not help then that tells me software, i have not dealt with this personally with this model but had this issue in a trailblazer a few years older, i am a very good diagnostic tech, so if you give me a chance im sure we canfigure this out, if we cannot i will open it up for others no worries.

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Customer reply replied 6 months ago
Sounds good. I think the first thing I should maybe do is pull the battery out and hold the cables together to pull all the capacitors and everything down. Re-install the original switches, install the battery and then clear any codes and see if the scan tool can access the driver/passenger door modules. How will I get ahold of you tomorrow morning?
Customer reply replied 6 months ago
I believe that the truck sat for an extended period of time, judging by the oil change sticker (mileage/date of service) Id say it sat for 6 months.
GMC Mechanic: Lou P., ASE Certified Technician replied 6 months ago
Good morning sorry for the delay
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GMC Mechanic: Lou P., ASE Certified Technician replied 6 months ago
Im ready when you are
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