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Home >> Ford >> 2007 >> E 150 V8-5.4L >> Repair and Diagnosis >> Wiper and Washer Systems >> Testing and Inspection >> Pinpoint Tests >> Test D: The Intermittent Wiper Speed Does Not Operate Correctly
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Test D: The Intermittent Wiper Speed Does Not Operate Correctly

PINPOINT TEST D: THE INTERMITTENT WIPER SPEED DOES NOT OPERATE CORRECTLY


D1-D3:






D3-D5:






Normal Operation
During normal operation, the windshield wiper motor receives voltage at all times through central junction box (CJB) circuit breaker 44 (20A), circuit 950 (WH/BK). The windshield wiper motor also receives power with the ignition switch in RUN or ACC positions through CJB fuse 9 (5A), circuit 65 (DG). Ground is provided to the windshield wiper motor through circuit 938 (BK/LG). The run/park relay and high/low relay are contained in the wiper motor electronics. Mode of operation is dependant on the signal(s) received from the multi-function switch.

Possible Causes
- Multi-function switch
- Open or short to ground in circuit 56 (DB/OG), 58 (WH) or 63 (RD)
- Windshield wiper motor
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