Test C: The Windshield Wipers Do Not Operate Correctly

PINPOINT TEST C: THE WINDSHIELD WIPERS DO NOT OPERATE CORRECTLY

C1-C3:

C4-C5:

C5-C10:

C10-C12:

C13-C15:

C16-C19:

C19-C22:

Normal Operation
With the ignition switch in the RUN or ACC position, the wiper run/park relay receives voltage from the smart junction box (SJB) through circuit 950 (WH/BK). When low speed wiper operation is selected, the SJB provides a ground path for the run/park relay coil through circuit 646 (YE/WH). The relay directs voltage from circuit 61 (YE/RD) through the hi/low relay to the wiper motor through circuit 58 (WH). When high speed wiper operation is selected, the SJB also provides a ground path for the hi/low relay coil through circuit 647 (GY/LB). Voltage is sent from the hi/low relay through circuit 58 (DB/OG) to the wiper motor. The wiper motor is grounded through circuit 57 (BK). When the wipers are turned off, the SJB de-energizes the run/park relay coil. Voltage continues to supply the hi/low relay through circuit 65 (DG) until the wiper mechanism contacts the run/park switch, which opens the circuit.

Possible Causes
- circuit 56 (DB/OG) open or short to voltage
- circuit 57 (BK) open
- circuit 58 (WH) open or short to voltage
- circuit 61 (YE/RD) open or short to voltage
- circuit 63 (RD) open or short to voltage
- circuit 65 (DG) open or short to ground
- circuit 647 (GY/LB) open, short to voltage, short to ground
- circuit 950 (WH/BK) open
- multifunction switch
- wiper hi/low relay
- SJB
- wiper motor