Pinpoint Test B: The Wipers are Inoperative - Rear Window
Wipers and Washers
Pinpoint Tests
Pinpoint Test B: The Wipers are Inoperative - Rear Window
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, when the ignition switch is in the RUN or ACCESSORY position, voltage is supplied to the Battery Junction Box (BJB) rear wiper relay coil through circuit CRW03 (VT/WH). The rear wiper relay coil is grounded at all times through circuit GD120 (BK/GN). High current voltage is supplied to the rear wiper relay through circuit SBB15 (WH/RD). When the rear wiper relay is activated it supplies voltage to the rear wiper motor through circuit CRW05 (BU). The rear window wiper motor is grounded through circuit GD149 (BK/GY). 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:
- Fuse(s)
- Wiring, terminals or connectors
- Multifunction switch
- Rear window wiper motor
- Rear wiper relay
PINPOINT TEST B: THE WIPERS ARE INOPERATIVE - 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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B1 CHECK CIRCUIT CRW05 (BU) FOR VOLTAGE
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C476.
- Ignition ON.
- Measure the voltage between rear window wiper motor C476-6, circuit CRW05 (BU), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to B6.
No
GO to B2.
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B2 CHECK THE REAR WIPER RELAY
- Ignition OFF.
- Disconnect: Rear Wiper Relay.
- Carry out the Relay component test for the 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 B3.
No
INSTALL a new rear wiper relay. TEST the system for normal operation.
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B3 CHECK CIRCUIT CRW03 (VT/WH) FOR VOLTAGE
- Ignition ON.
- Measure the voltage between BJB rear wiper relay socket pin 2, circuit CRW03 (VT/WH), and ground.
- Is the voltage greater than 10 volts?
Yes
GO to B4.
No
REPAIR the circuit. TEST the system for normal operation.
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B4 CHECK CIRCUIT SBB15 (WH/RD) FOR VOLTAGE
- Measure the voltage between BJB rear wiper relay socket pin 5, circuit SBB15 (WH/RD), and ground.
- Is the voltage greater than 10 volts?
Yes
GO to B5.
No
VERIFY BJB fuse 15 (25A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. REPAIR the circuit. TEST the system for normal operation. Diagrams By Number
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B5 CHECK REAR WIPER RELAY CIRCUIT GD120 (BK/GN) FOR GROUND
- Ignition OFF.
- Measure the resistance between BJB rear wiper relay socket pin 1, circuit GD120 (BK/GN), and ground.
- Is the resistance less than 5 ohms?
Yes
REPAIR open in circuit CRW05 (BU). TEST the system for normal operation.
No
REPAIR open in circuit GD120 (BK/GN). TEST the system for normal operation.
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B6 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between rear window wiper motor C476-5, circuit GD149 (BK/GY), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to B7.
No
REPAIR the circuit. TEST the system for normal operation.
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B7 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 B8.
No
INSTALL a new multifunction switch. REFER to Steering Column Switches Steering Column Multifunction Switch.
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B8 CHECK CIRCUIT GD114 (BK/BU) FOR AN OPEN
- Measure the resistance between multifunction switch C202-15, circuit GD114 (BK/BU), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to B9.
No
REPAIR the circuit. TEST the system for normal operation.
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B9 CHECK CIRCUIT CRW21 (YE/VT) FOR AN OPEN
- Measure the resistance between multifunction switch C202-13, circuit CRW21 (YE/VT), harness side and rear window wiper motor C476-3, circuit CRW21 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to B10.
No
REPAIR the circuit. TEST the system for normal operation.
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B10 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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