Pinpoint Test D: The Wipers Stay On Continuously - Rear Window
Wipers and Washers
Pinpoint Tests
Pinpoint Test D: The Wipers Stay On Continuously - Rear Window
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, the rear window wiper motor receives open and ground inputs from the multifunction switch through circuits CRW20 (GY/YE) and CRW21 (YE/VT) to activate the wiper to the appropriate modes. The multifunction switch supplies a ground input to the rear wiper motor on circuit CRW21 (YE/VT) when INT 1 is selected. The multifunction switch supplies ground to the rear wiper motor on circuits CRW21 (YE/VT) and CRW20 (GY/YE) when INT 2 is selected.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Rear window wiper motor
- Multifunction switch
- Rear wiper relay
PINPOINT TEST D: THE WIPERS STAY ON CONTINUOUSLY - REAR WINDOW
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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D1 CHECK THE REAR WIPER RELAY
- Ignition OFF.
- Disconnect: Rear Wiper Relay.
- Carry out the Relay component test for the Battery Junction Box (BJB) rear wiper relay.
Refer to Wiring Diagrams for component testing. Diagrams By Number
- Did the rear wiper relay pass the component test?
Yes
GO to D2.
No
INSTALL a new rear wiper relay. TEST the system for normal operation.
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D2 CHECK THE MULTIFUNCTION SWITCH
- Disconnect: Multifunction Switch C202.
- Carry out the Multifunction Switch component test.
Refer to Headlamp Dimmer Switch, Turn Signal Switch, Windshield Washer Switch, or Wiper Switch for component testing.
- Did the multifunction switch pass the component test?
Yes
GO to D3.
No
INSTALL a new multifunction switch. REFER to Steering Column Switches Steering Column Multifunction Switch.
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D3 CHECK CIRCUITS CRW20 (GY/YE) AND CRW21 (YE/VT) FOR A SHORT TO GROUND
- Disconnect: Rear Window Wiper Motor C476.
- Measure the resistance between ground and rear window wiper motor:
- C476-3, circuit CRW21 (YE/VT), harness side.
- C476-4, circuit CRW20 (GY/YE), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to D4.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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D4 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 rear window wiper motor. REFER to Wiper Motor - Rear Window Wiper Motor - Rear Window.
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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