[wiswind]

I have looked this up for my '96....so placement may be different on yours.

There is a windshield washer pump motor relay in the engine compartment fuse box. This relay does not power the rear wiper / washer.
It looks like the front wipers and washer are powered by the same fuse....#18 in the Intrument Panel fuse box. So, if your wipers work....the fues would be good. So...I would suspect the relay.

Looks like the rear "liftgate" wiper and washer are powered by fuse #24 in the instrument panel fuse box....this is located just over the driver's left foot....when looking up under the dash board.

You will need to consult your owner's manual for relay location as I know that you have more relays in the engine compartment "fues box" than I do...so the layout will be different.

The owner's manual will also give you a layout of the fuses...and what powers what.