Pinpoint Test A: The Wipers Are Inoperative - Windshield

Wipers and Washers

Pinpoint Tests

Pinpoint Test A: The Wipers are Inoperative - Windshield

Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number

Normal Operation

Under normal operation, the front windshield wiper motor receives power through circuits SBB58 (YE/RD) and CBP45 (YE). The front windshield wiper motor is grounded through circuit GD120 (BK/GN). The front windshield wiper motor receives open and ground inputs from the multifunction switch through circuits CRW17 (GN/VT), CRW18 (VT/WH), CRW19 (BU/OG) and CRW08 (VT/OG) to activate the wipers to the appropriate speeds. The multifunction switch receives ground through circuit GD116 (BK/VT).

This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Multifunction switch
- Windshield wiper motor



PINPOINT TEST A: THE WIPERS ARE INOPERATIVE - WINDSHIELD

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A1 CHECK CIRCUITS SBB58 (YE/RD) AND CBP45 (YE) FOR VOLTAGE


- Ignition OFF.
- Disconnect: Windshield Wiper Motor C1552.
- Ignition ON.
- Measure the voltage between ground and windshield wiper:
- C1552-5, circuit SBB58 (YE/RD), harness side.
- C1552-8, circuit CBP45 (YE), harness side.




- Are the voltages greater than 10 volts?

Yes
GO to A2.

No
VERIFY that Battery Junction Box (BJB) fuse 58 (30A) and Smart Junction Box (SJB) fuse 45 (5A) are OK. If OK, REPAIR the circuit(s) in question.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation.

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A2 CHECK CIRCUIT GD120 (BK/GN) FOR AN OPEN


- Ignition OFF.
- Measure the resistance between ground and windshield wiper motor:
- C1552-3, circuit GD120 (BK/GN), harness side.
- C1552-6, circuit GD120 (BK/GN), harness side.




- Are the resistances less than 5 ohms?

Yes
GO to A3.

No
REPAIR the circuit(s) in question. TEST the system for normal operation.

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A3 CHECK THE MULTIFUNCTION SWITCH


- Disconnect: Multifunction Switch C202.
- Carry out the Multifunction Switch Component Test.

- Did the multifunction switch pass the component test?

Yes
GO to A4.

No
INSTALL a new multifunction switch.

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A4 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN


- Measure the resistance between multifunction switch C202-15, circuit GD116 (BK/VT), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to A5.

No
REPAIR the circuit. TEST the system for normal operation.

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A5 CHECK FOR SHORTS IN THE WINDSHIELD WIPER MOTOR HARNESS


- Measure the resistance between windshield wiper motor C1552, harness side, using the following chart:









- Is the resistance greater than 10,000 ohms for all measurements?

Yes
GO to A6.

No
REPAIR the circuit. TEST the system for normal operation.

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A6 CHECK FOR CORRECT WINDSHIELD WIPER MOTOR OPERATION


- Disconnect all windshield wiper motor connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all the windshield 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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