Pinpoint Test C: The High/Low Wiper Speeds Do Not Operate Correctly
Wipers and Washers
Pinpoint Tests
Pinpoint Test C: The High/Low Wiper Speeds Do Not Operate Correctly
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
- Wiper motor
- Multifunction switch
PINPOINT TEST C: THE HIGH/LOW WIPER SPEEDS DO NOT OPERATE CORRECTLY
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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C1 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 C2.
No
INSTALL a new multifunction switch. REFER to Steering Column. TEST the system for normal operation.
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C2 CHECK CIRCUITS CRW08 (VT/OG), CRW17 (GN/VT) AND CRW19 (BU/OG) FOR AN OPEN
- Disconnect: 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 C3.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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C3 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 C4.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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C4 CHECK FOR SHORTS IN THE WIPER MOTOR HARNESS
- Measure the resistance between wiper motor C125, harness side, using the following chart:
- Is the resistance greater than 10,000 ohms for all measurements?
Yes
GO to C5.
No
REPAIR the circuit. TEST the system for normal operation.
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C5 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 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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