You can check the backup switch itself.

Hmm, I don't recall an inline fuse on the backup light circuit that is
in the engine compartment. I only had a connector there.

My backup switch died recently had to be replaced. The new ones use a
different connector than the old ones, which will require splicing a
new connector into your wiring harness if that is the issue.

I thought I posted a message on this a couple of months ago, so it
should be in the archive.

On Mar 24, 2004, at 5:24 PM, Wesley Alden Pegden wrote:

> and its not the bulbs.  I tried finding the "line fuse in engine
> compartment" that my haynes manual talks 'bout, but couldn't locate it.
> It would seem funny to me if the fuse blew, but who knows.  What else
> can
> I check?