Pinpoint Test E: The High/Low Wiper Speeds Do Not Operate Correctly - Windshield
Wipers and Washers
Pinpoint Tests
Pinpoint Test E: The High/Low Wiper Speeds Do Not Operate Correctly - Windshield
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the wiper motor receives open and ground inputs from the multifunction switch through circuits CRW08 (VT/OG), CRW17 (GN/VT) and CRW19 (BU/OG) to activate the wipers in the high and low speeds.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Windshield wiper motor
- Multifunction switch
PINPOINT TEST E: THE HIGH/LOW WIPER SPEEDS DO NOT OPERATE CORRECTLY - WINDSHIELD
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E1 CHECK THE MULTIFUNCTION SWITCH
- Ignition OFF.
- Disconnect: Multifunction Switch C202.
- Carry out the Multifunction Switch component test.
- Did the multifunction switch pass the component test?
Yes
GO to E2.
No
INSTALL a new multifunction switch. TEST the system for normal operation.
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E2 CHECK CIRCUITS CRW19 (BU/OG), CRW08 (VT/OG) AND CRW17 (GN/VT) FOR AN OPEN
- Disconnect: Windshield Wiper Motor C125.
- Measure the resistance between multifunction switch C202, harness side and wiper motor C125, harness side using the following chart:
- Are the resistances less than 5 ohms?
Yes
GO to E3.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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E3 CHECK CIRCUITS CRW08 (VT/OG), CRW17 (GN/VT) and CRW19 (BU/OG) FOR A SHORT TO GROUND
- Measure the resistance between ground and wiper motor:
- C125-1, circuit CRW08 (VT/OG), harness side.
- C125-9, circuit CRW17 (GN/VT), harness side.
- C125-10, circuit CRW19 (BU/OG), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to E4.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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E4 CHECK FOR SHORTS IN THE WINDSHIELD WIPER MOTOR HARNESS
- Measure the resistance between wiper motor C125, harness side, using the following chart:
- Are the resistances greater than 10,000 ohms for all measurements?
Yes
GO to E5.
No
REPAIR the circuit. TEST the system for normal operation.
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E5 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 - Windshield Wiper Motor - Windshield.
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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