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, when the ignition switch is in the RUN or ACCESSORY position, voltage is supplied to the wiper run/park relay coil through circuit CBP45 (YE). The wiper run/park coil is grounded at all times through circuit GD120 (BK/GN). High current voltage is supplied to the wiper run/park relay through circuit SBB03 (BU/RD). When the wiper run/park relay is activated, it supplies voltage to the front windshield wiper motor through circuit CRW03 (VT/WH). The front windshield wiper motor is grounded through circuits GD123 (BK/GY) and GD120 (BK/GN). The multifunction switch is grounded through circuit GD111 (BK/BU). 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 modes.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Relay
- Wiring, terminals or connectors
- Multifunction switch
- Windshield wiper motor
PINPOINT TEST A: THE WIPERS ARE INOPERATIVE - WINDSHIELD
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A1 CHECK CIRCUIT CRW03 (VT/WH) FOR VOLTAGE
- Disconnect: Wiper Motor C125.
- Ignition ON.
- Measure the voltage between windshield wiper motor C125-5, circuit CRW03 (VT/WH), harness side and ground; and between windshield wiper motor C125-8, circuit CRW03 (VT/WH), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to A6.
No
GO to A2.
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A2 CHECK THE WIPER RUN/PARK RELAY
- Ignition OFF.
- Disconnect: Wiper Run/Park Relay.
- Carry out the Wiper Run/Park Relay Component Test.
- Did the wiper run/park relay pass the component test?
Yes
GO to A3.
No
INSTALL a new wiper run/park relay. TEST the system for normal operation.
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A3 CHECK CIRCUIT CBP45 (YE) FOR VOLTAGE
- Ignition ON.
- Measure the voltage between wiper run/park relay pin 85, circuit CBP45 (YE), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to A4.
No
VERIFY Smart Junction Box (SJB) fuse 45 (5A) is OK. If OK, REPAIR the circuit. 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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A4 CHECK CIRCUIT SBB03 (BU/RD) FOR VOLTAGE
- Measure the voltage between wiper run/park relay pin 30, circuit SBB03 (BU/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to A5.
No
VERIFY Battery Junction Box (BJB) fuse 3 (30A) is OK. If OK, REPAIR the circuit. 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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A5 CHECK WIPER RUN/PARK CIRCUIT GD120 (BK/GN) FOR GROUND
- Measure the resistance between wiper run/park relay pin 86, circuit GD120 (BK/GN), and ground.
- Is the resistance less than 5 ohms?
Yes
REPAIR open in circuit CRW03 (VT/WH). TEST the system for normal operation.
No
REPAIR open in circuit GD120 (BK/GN). TEST the system for normal operation.
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A6 CHECK CIRCUITS GD123 (BK/GY) AND GD120 (BK/GN) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between windshield wiper C125-6, circuit GD120 (BK/GN), harness side and ground; and between windshield wiper motor C125-3, circuit GD123 (BK/GY), harness side and ground.
- Are the resistances less than 5 ohms?
Yes
GO to A7.
No
REPAIR the circuit(s). TEST the system for normal operation.
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A7 CHECK THE WIPER SWITCH
- Disconnect: Multifunction Switch C202.
- Carry out the Multifunction Switch Component Test.
- Did the multifunction switch pass the component test?
Yes
GO to A8.
No
INSTALL a new multifunction switch.
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A8 CHECK CIRCUIT GD111 (BK/BU) FOR AN OPEN
- Measure the resistance between multifunction switch C202-15, circuit GD111 (BK/BU), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to A9.
No
REPAIR the circuit. TEST the system for normal operation.
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A9 CHECK FOR A SHORT IN THE WINDSHIELD WIPER MOTOR HARNESS
- Measure the resistance at windshield wiper motor C125, harness side, between the circuits shown in the following chart.
- Is the resistance greater than 10,000 ohms for all measurements?
Yes
GO to A10.
No
REPAIR the circuit. TEST the system for normal operation.
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A10 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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