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 circuit SBB30 (BN/RD) and circuit CBP12 (GN/WH). The rear window wiper motor is grounded through circuit GD150 (BK/WH). 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 rear window wiper motor monitors the liftgate glass ajar switch through circuit CPL58 (GY/OG). When the liftgate glass is closed, this circuit is grounded. If ground is not detected on this circuit by the rear window wiper motor, rear window wiper operation is disabled.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- Rear window wiper motor
- Multifunction switch
PINPOINT TEST B: THE WIPERS ARE INOPERATIVE - REAR WINDOW
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B1 CHECK CIRCUITS CBP12 (GN/WH) AND SBB30 (BN/RD) FOR VOLTAGE
- Ignition OFF.
- Disconnect: Rear Window Wiper Motor C4323.
- Ignition ON.
- Measure the voltage between rear window wiper motor C4323-7, circuit CBP12 (GN/WH), harness side and ground; and between rear window wiper motor C4323-8, circuit SBB30 (BN/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to B2.
No
VERIFY Battery Junction Box (BJB) fuse 30 (25A) and Smart Junction Box (SJB) fuse 12 (5A) are OK. If OK, REPAIR the circuit(s) in question. If not OK, REFER to the Wiring Diagrams to identify the possible cause of the circuit short. TEST the system for normal operation. Diagrams By Number
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B2 CHECK CIRCUIT GD150 (BK/WH) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between rear window wiper C4323-2, circuit GD150 (BK/WH), harness side and ground; and between rear window wiper C4323-3, circuit GD150 (BK/WH), 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 GD145 (BK/BU) FOR AN OPEN
- Measure the resistance between multifunction switch C202-15, circuit GD145 (BK/BU), 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 CPL58 (GY/OG) FOR AN OPEN
- The liftgate must be closed.
- Measure the resistance between rear wiper motor C4323-6, circuit CPL58 (GY/OG) harness side and ground.
- 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 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 C4323-1, circuit CRW21 (YE/VT), harness side.
- 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 FOR CORRECT WIPER MOTOR OPERATION
- Disconnect all wiper motor connectors.
- Check for:
- liftgate glass open.
- 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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