GM Service Manual Online
For 1990-2009 cars only

The rear window wiper/washer system uses a positive-park, single-speed permanent-magnet wiper motor assembly which is attached to the endgate. The plug-in circuit board is a serviceable part of the wiper motor assembly. The wiper arm and blade assembly is directly attached to the wiper motor. Operation is controlled by a dash-mounted wiper/washer switch.

The washer pump is mounted in the rear external cavity of the washer solvent container which is in the engine compartment. The rear washer pump is mounted higher than the front washer pump allowing the rear window washer to run out of solvent before the front windshield washer.