Pinpoint Test B: The Wipers Stay On Continuously
Wipers and Washers
Pinpoint Test
Pinpoint Test B: The Wipers Stay On Continuously
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number
Normal Operation
During normal operation, the windshield wiper motor receives voltage at all times through Battery Junction Box (BJB) fuse 29 (30A), circuit SBB29 (GY/RD). The windshield wiper motor also receives power with the ignition switch in RUN or ACC positions through Smart Junction Box (SJB) fuse 5 (5A), circuit CBP05 (YE). Ground is provided to the windshield wiper motor through circuit GD121 (BK/YE) and circuit GD174 (BK/WH). The run/park and high/low relays are contained in the wiper motor electronics. Mode of operation is dependent on the signal(s) received from the multifunction switch. The windshield wiper motor receives open and ground inputs from the multifunction switch through circuits CRW17 (GN/VT), CRW18 (VT/WH), CRW19 (BU/OG) and CRW15 (BN/WH) to activate the wipers to the appropriate speeds.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Multifunction switch
- Windshield wiper motor
PINPOINT TEST B: THE WIPERS STAY ON CONTINUOUSLY
NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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B1 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202A.
- Carry out the Multifunction Switch Component Test.
- Did the multifunction switch pass the component test?
Yes
GO to B2.
No
INSTALL a new multifunction switch. REFER to Steering Column.
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B2 CHECK CIRCUITS CRW19 (BU/OG), CRW18 (VT/WH), CRW15 (BN/WH) OR CRW17 (GN/VT) FOR A SHORT
- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between ground and windshield wiper motor:
- C125-1, circuit CRW15 (BN/WH), harness side.
- C125-9, circuit CRW17 (GN/VT), harness side.
- C125-10, circuit CRW19 (BU/OG), harness side.
- C125-11, circuit CRW18 (VT/WH), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to B3.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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B3 CHECK FOR CORRECT WIPER MOTOR OPERATION
- Disconnect all wiper motor connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all wiper motor connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new windshield wiper motor. REFER to Wiper Motor Service and Repair.
No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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