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About tiwillia

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  • Birthday July 25

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  1. Dealer identified a cable was cut between the module and the switch. Module has power but the wires going into the switch don't. They wanted $700 to fix it, so I'll be taking the seat out myself and removing/inspecting the harness they mentioned. Now to search for the diagram for circuit 1440... Sent from my Pixel 3 XL using Tapatalk
  2. Thanks for the part number, its good to know its only a $40 part. Taking it to the dealership tomorrow to let them diagnose, if its just the module I'll replace myself.
  3. Yeah I took off the seat plastic that just clips in and had a really good look under there. I unzipped the back too and looked around at the lumbar bag and the wires around it. As far as I can tell, I can't see any electrical burn marks, any crushed wires, or any wire insulation that has been stripped away. Next step is to try to figure out how to get the plastic behind the switches off and get a better look at the wiring for the switches themselves. Really wish I had a service manual.
  4. Last week I noticed my passenger side powered seat on my 2017 Sierra Denali was no longer working. Just dead, switches resulted in no movement. Checked the fuse and it was blown, replaced with a spare and tried the seat again. Lower seat switch worked fine. Seat back switch worked fine. The moment I moved the lumbar support switch I saw a flash come from underneath the seat and the fuse was blown. I replaced the fuse again and - nothing. The seat is now dead. The driver's seat makes a sound like a relay switching when you move the switches, but I don't even get that on the passenger seat now. Verified again that the fuse is fine, moved it to the rear sliding glass to test. Anyone have any idea what may have broken? I understand it appears I have/had a short somewhere in the lumbar support, but now the whole passenger seat seems to be dead. Is there a relay somewhere that would need to be replaced? Anyone have the powered seat wiring diagrams? Would anyone, at minimum, be able to remove their passenger side seat fuse and tell me if they hear the relay switching noise even when the fuse is removed? First post since I've always been able to find the answer here before with some creative searching, but not this time.
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