Pinpoint Test A: The Wipers Are Inoperative
Wipers and Washers
Pinpoint Test A: The Wipers Are Inoperative
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information [1][2]Diagrams By Number.
Normal Operation
When the ignition switch is in the RUN or ACCESSORY position, voltage is supplied to the wiper relay coil through circuit CBP45 (YE). The wiper relay coil is grounded at all times through circuit GD129 (BK/YE). Voltage is supplied to the wiper relay switch through circuit SBB09 (RD). When the wiper relay is activated, voltage is supplied to the wiper motor through circuit CRW03 (VT/WH) and through CBP45 (YE) when the ignition switch is in the RUN or ACCESSORY position. The wiper motor is grounded through circuits GD129 (BK/YE) and GD123 (BK/GY). The multifunction switch is grounded through circuit GD116 (BK/VT). The multifunction switch sends open and ground input signals to the wiper motor through circuits CRW17 (GN/VT), CRW18 (VT/WH), CRW19 (BU/OG) and CRW08 (VT/OG) in order to activate the wiper motor to the requested modes.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiper motor
- Wiper relay
- Multifunction switch
- Wiring, terminals or connectors
PINPOINT TEST A : THE WIPERS ARE INOPERATIVE
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.
A1 CHECK THE WINDSHIELD WIPER MOTOR FOR VOLTAGE
- Disconnect: Wiper Motor C125.
- Ignition ON.
- Measure the voltage between ground and wiper motor:
- C125-5, circuit CRW03 (VT/WH), harness side.
- C125-8, circuit CBP45 (YE), harness side.
Are the voltages greater than 10 volts?
Yes
GO to A6.
No
GO to A2.
A2 CHECK THE WIPER RELAY
- Ignition OFF.
- Disconnect: Wiper Relay.
- Carry out the Micro ISO Relay component test for the wiper relay.
Did the wiper relay pass the component test?
Yes
GO to A3.
No
INSTALL a new wiper relay. TEST the system for normal operation.
A3 CHECK THE VOLTAGE TO THE WIPER RELAY COIL
- Ignition ON.
- Measure the voltage between Battery Junction Box (BJB) wiper relay pin 86, 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 [1][2]Diagrams By Number. TEST the system for normal operation.
A4 CHECK THE VOLTAGE TO THE WIPER RELAY SWITCH
- Measure the voltage between BJB (Battery Junction Box) wiper relay pin 30, circuit SBB09 (RD), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to A5.
No
VERIFY BJB (Battery Junction Box) fuse 9 (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 [1][2]Diagrams By Number. TEST the system for normal operation.
A5 CHECK THE GROUND TO THE WIPER RELAY COIL
- Measure the resistance between BJB (Battery Junction Box) wiper relay pin 85, circuit GD129 (BK/YE), harness side 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 GD129 (BK/YE). TEST the system for normal operation.
A6 CHECK WIPER MOTOR CIRCUITS GD129 (BK/YE) AND GD123 (BK/GY) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ground and wiper motor:
- C125-3, circuit GD129 (BK/YE), harness side.
- C125-6, circuit GD123 (BK/GY), harness side.
Are the resistances less than 5 ohms?
Yes
GO to A7.
No
REPAIR the circuit(s). TEST the system for normal operation.
A7 CHECK THE MULTIFUNCTION 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.
A8 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 A9.
No
REPAIR the circuit. TEST the system for normal operation.
A9 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 wiper motor. REFER to Wiper Motor .
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.