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, the rear window wiper motor receives power through circuits SBB19 (BU/RD) and CBP43 (GY). 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 speeds. The multifunction switch supplies a ground input to the rear wiper motor on CRW21 (YE/VT) when INT 1 is selected. The multifunction switch supplies ground to the rear wiper motor on 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
PINPOINT TEST B: THE WIPERS ARE INOPERATIVE - REAR WINDOW
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B1 CHECK CIRCUITS SBB19 (BU/RD) AND CBP43 (GY) FOR VOLTAGE
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C4218.
- Ignition ON.
- Measure the voltage between ground and rear window wiper motor:
- C4218-6. circuit SBP19 (BU/RD), harness side.
- C4218-8, circuit CBP43 (GY), harness side.
- Are the voltages greater than 10 volts?
Yes
GO to B2.
No
VERIFY Smart Junction Box (SJB) fuses 19 (25A) and 43 (10A) 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. Diagrams By Number
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B2 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between rear window wiper C4218-5, circuit GD149 (BK/GY), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to B3.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
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B3 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 B4.
No
INSTALL a new multifunction switch. REFER to Steering Column.
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B4 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 B5.
No
REPAIR the circuit. TEST the system for normal operation.
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B5 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 C4218-3, circuit CRW21 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to B6.
No
REPAIR the circuit. TEST the system for normal operation.
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B6 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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