Now that I'm taking a closer look at the picture I posted, I do see some possible problem areas in the middle of the picture, on the light metal bracket holding up the motor. Not sure at this point if thats rust under the paint or some nasty gunk the previous owner got under the seat.
Doesn't seem to be a problem I'm having. Here is a picture I took of the bottom of the seat when I had it out and apart: You can see the rod at the top right of the picture. Everything else looks fine. Thanks for the heads up!
No, just that one piece. If you look under your seat, its a long metal rod that goes from one side of the seat to the other in the front. It holds on the plastic that keeps a lot of the wires from falling down or getting caught. It also seems to provide rigidity to the seat. Its just got surface rust on it, doesn't seem to be an issue. GM painted every piece of metal under the seat except that one rod.
Here is my fix. Taped up the exposed wire real well with electrical tape. The rest of the wires had scratches on the insulation, so they were at risk of this too, so I taped each one, then taped them all together with several layers of tape. Wire-tied them to the switch panel plastic and they are no longer rubbing on that rusty looking metal piece. Seat is back in and working great now. Thanks for all the help.
Apparently there is a circuit breaker in the seat circuit somewhere. If you unplug the seat (with the big plug underneath the plastic below the seat switch panel) for a few minutes and plug it back in, it resets the circuit breaker. So I was able to get power back to the seat to move it so I could access the bolts (remember the horizontal movement still works, the lumbar is where the short is). I removed the seat complety, took a lot of it apart, inspected every connector associated with the lumbar I could find, and finally found the short near the connector to the switch panel. You can see the corrosion and the exposed wire on the bottom-most wire in this picture:
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
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.
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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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