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.