Seat not working?

Tiny
NCYUKONXL
  • MEMBER
  • 2007 GMC YUKON
  • 6.2L
  • V8
  • AWD
  • AUTOMATIC
  • 76,000 MILES
It seems every other function of seat works. When trying to apply more or less lumbar, nothing happens and lumbar just makes a motor working sound. It will move up and down but just not inflate.

Any ideas? How hard of a fix? Are there airbags in the seat which make it tricky to work on? It's a new truck for me.
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
HMAC300
  • EXPERT
Either get a manual or rent one on site here for a week so you can print the instructions out probably time consuming mostly.
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
CHRIS EMERY
  • MEMBER
Pulled the trim. Inspected the grounds. Traced the black wire in the harness (under the sill plate) to where it turns to go under the seat. Checked the ground to that point. Shows a good ground when probing the wire.
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
NCYUKONXL
  • MEMBER
Thanks for your kind reply, though that's not exactly an answer to the issue. After further searching I've found out a bit more regarding a cheap plastic piece that could have broken. Shouldn't be a surprise as its American made.
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
Then there's only three possibilities. The terminal for the ground wire is stretched and not making good contact with the mating terminal. There's a break inside the switch assembly, most likely where the ground terminal is soldered to the circuit board, or all three switches are bad. That last one is not very likely.
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
CHRIS EMERY
  • MEMBER
How do I isolate these down to one.

"There's a break inside the switch assembly, most likely where the ground terminal is soldered to the circuit board"
Are we talking about the power seat switch here? No ground present at the switch.

I agree I don't believe all three seat adjuster switches are bad (in 1 assembly).
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
CRHENKEL
  • MEMBER
I have similar 2007 Yukon Denali driver's seat lumbar failure problem. Where can I get this repair manual you mentioned. I would like to rent one for a while to research my seat failure issue.
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
You should be able to pop the switch apart, then expect to find the switches soldered to some type of circuit board. Look at the terminal that corresponds to the black / white wire and see if it is loose where it is soldered or crimped to the board.

Even easier, find a switch at a salvage yard and plug it in to try it.
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
KEN L
  • ADMIN
Here is the repair manual, I found more info in the diagrams below.

https://www.2carpros.com/manuals/manuals.php

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
FRANKLH
  • MEMBER
  • 2007 GMC YUKON
  • 80,000 MILES
I have a power seat that won't go up or down in the back. I have power and believe that the worm gear is stuck in the up position. How would I 1) get to it and 2) how would I get the worm gear past it's bound state.
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+1
Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
The seat has to be removed, coverings removed to access the motor. I doubt it is the gear. Most likely failure is the motor itself.

Roy
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
FRANKLH
  • MEMBER
The motor wants to turn and I see the worm gear trying to turn when I hit the button.
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Tuesday, September 3rd, 2019 AT 6:25 PM (Merged)
Tiny
PAULDOC53
  • MEMBER
  • 2004 GMC YUKON
  • V8
  • AWD
  • AUTOMATIC
  • 81,450 MILES
The driver's side power seat won't go forward or backwards anymore. It is stuck in the far back position. All the other power functions for the seat still work. The dealer wants over 300 dollars just to diagnose the problem! I hate to think of paying that amount just to replace a switch or motor! Is there any way to move the seat forward without the power? I can still drive it, but my wife is just too short to reach the wheel and pedals, even with the power pedals all the way up!
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Tuesday, September 3rd, 2019 AT 6:26 PM (Merged)
Tiny
MERLIN2021
  • EXPERT
Testing requires the use of a GM compatible scan tool, may shops have scanners that can be used, These systems have a DDM, data comunication lines and BCM, so to get the right answer, you need to read "B" and maybe "U" codes. About the only thing you can try is unplug the connectors and re-plug.
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-2
Tuesday, September 3rd, 2019 AT 6:26 PM (Merged)
Tiny
RWIS1
  • MEMBER
  • 2003 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 37,000 MILES
I have a 2003 gmc yukon xl and the electric seat would not go back when exiting the auto it would go forwards now it is all the way back and wont move any place
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Tuesday, September 3rd, 2019 AT 6:26 PM (Merged)
Tiny
HMAC300
  • EXPERT
Check your fuses and relays as it may be blown and not letting any power go to the switch. If those are ok, then take it to a pro wher ehe can check switches, motor, or cables. Also make sure nothing is in the way like a pop can or foreign object.
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Tuesday, September 3rd, 2019 AT 6:26 PM (Merged)

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