electric controls for drivers seat forward/back/up/down do not work how to fix on 1990 Chevrolet G Series Van (G20)

we can not find a fuse, and need to know where it is and which fuse, and what to do next.

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
maybe the switch is no good