Pinpoint Test A: The Wipers Are Inoperative
Wipers and Washers
Pinpoint Tests
Pinpoint Test A: The Wipers are Inoperative
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. Diagrams By Number
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 SBB04 (GN/RD). When the wiper run/park relay is activated, voltage is supplied to the wiper motor through circuit CRW03 (VT/WH). The wiper motor is grounded through circuit GD120 (BK/GN). 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)
- Front wipers relay
- Wiring, terminals or connectors
- Multifunction switch
- Wiper motor
PINPOINT TEST A: THE WIPERS ARE INOPERATIVE
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A1 CHECK CIRCUITS CRW03 (VT/WH) AND CBP45 (YE) 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.
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A2 CHECK THE FRONT WIPER RELAY
- Ignition OFF.
- Disconnect: Front Wiper Relay.
- Carry out the Relay component test for the front wiper relay.
- Did the front wiper relay pass the component test?
Yes
GO to A3.
No
INSTALL a new front wiper relay. TEST the system for normal operation.
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A3 CHECK CIRCUIT CBP45 (YE) FOR VOLTAGE
- Ignition ON.
- Measure the voltage between front wiper 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 SBB04 (GN/RD) FOR VOLTAGE
- Measure the voltage between front wiper relay pin 30, circuit SBB04 (GN/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to A5.
No
VERIFY Battery Junction Box (BJB) fuse 4 (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 CIRCUIT GD120 (BK/GN) FOR GROUND
- Measure the resistance between front wiper 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 CIRCUIT GD120 (BK/GN) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ground and wiper motor:
- C125-6, circuit GD120 (BK/GN), harness side.
- C125-3, circuit GD120 (BK/GN), harness side.
- 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 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.
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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.
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A9 CHECK FOR A SHORT TO GROUND IN THE WIPER MOTOR HARNESS
- Measure the resistance between wiper motor C125, harness side, using 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 WIPER MOTOR OPERATION
- Disconnect all wiper motor connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all the 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 Service and Repair.
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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