Got my 64 DeVille back from upholstery last Friday. The motor was smoked before I took it to them. They installed the new Motor, Relay, transmission, and cables that I provided to them. They were only able to make the tilt function work correctly. I can hear the motor spinning when I try to slide the seat forward and back. and I can hear the motor spinning when I raise and lower the seat.
I checked to make sure the cables were unbroken, everything is connected
Sooo....what am I missing here?
Its the solenoids in the transmission that are stuck. You need to take the transmission apart and check the solenoids. It should be sufficient just to clean it properly and re-grease with lithium grease.
It could also be that the switch is not sending current to the solenoid and only sending current to the motor, so the solenoid is not engaging. That's an easy check with a volt meter. But my money is on the hardened grease in the transmission making the solenoids stuck.
When I take apart a seat transmission, use the white lithium grease on the gears only. For the sliders, I use a spray on silicone.