Thanks Gilly. I'll double-check those fuses. I checked at lunch today regarding the outside mirrors - the motor to move the mirrors worked even thought the reverse lights and the seatbelt presenter did not.

There must be some common wiring for these two functions, and there must be a short or bad connection in that common wiring. I just don't know exactly where to start checking. I have had the back seats and side panels out. I could get back in there and see what I can start to eliminate. Thanks for your suggestions. I'll post any progress as I make it.

Getting busy at work for the next three weeks or so. It may have to wait.