Test D: The Intermittent Windshield Wiper Speed Does Not Operate Correctly (High/Low Speeds OK)

PINPOINT TEST D: THE INTERMITTENT WINDSHIELD WIPER SPEED DOES NOT OPERATE CORRECTLY (HIGH/LOW SPEEDS OK)

D1-D4:

D4-D5:

Normal Operation
The windshield wiper motor receives a ground signal from the multifunction switch through circuits 56 (DB/OG), 58 (WH), 61 (YE/RD), and 63 (RD). When a wiper function is selected, the multifunction switch grounds 1 of several combinations of these 4 circuits. The windshield wiper motor interprets these ground signals and performs the action requested. The multifunction switch is grounded through circuit 57 (BK).

Possible Causes
- circuit 56 (DB/OG) open
- circuit 57 (BK) open
- circuit 61 (YE/RD) open
- circuit 63 (RD) open
- multifunction switch
- windshield wiper motor