Rear Windshield Washer Inoperative

Disconnect windshield washer pump wiring harness connector (C162). See Fig 3 . Turn ignition to ACCY position. Connect test light between windshield washer pump wiring harness connector terminal No. 392 (Green wire) and ground. Push washer switch button on. If test light comes on, go to next step. If test light does not come on, go to step 3).
Connect test light between windshield washer pump wiring harness connector (C162) terminal No. 392 and terminal No. 150 (Black wire). If test light does not come on, repair open circuit in Black wire to ground. If test light does come on, repair or replace windshield washer pump.
Connect test light between wiper switch connector (C362) terminal No. 392 (Green wire) and ground. Push washer switch button on. If test light comes on, repair open circuit in Green wire between wiper switch and wiper motor. If test light comes on, repair or replace wiper switch.

Fig 1: Front Windshield Wiper System Schematic (Pulse Wiper System)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Front Windshield Wiper Sys Schematic (Exc Pulse Wiper System)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Rear Windshield Wiper System Schematic

Courtesy of GENERAL MOTORS CORP.