Pinpoint Test C: The High/Low Wiper Speeds Do Not Operate Correctly
Wipers and Washers
Pinpoint Test C: The High/Low Wiper Speeds Do Not Operate Correctly
Refer to Wiring Diagram Set 81, Wipers and Washers for schematic and connector information. [1][2]Diagrams By Number
Normal Operation
Under normal operation, the wiper/washer module receives open and ground inputs from the multifunction switch through circuits CRW08 (VT/OG), CRW17 (GN/VT), CRW18 (VT/WH) and CRW19 (BU/OG) to activate the wiper motor in the high and low speeds. The wiper/washer module supplies voltage to the wiper motor through circuits CRW16 ([GY/BN] low) and CRW15 ([BN/WH] high).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Wiper motor
- Multifunction switch
- Wiper/washer module
PINPOINT TEST C : THE HIGH/LOW WIPER SPEEDS DO NOT OPERATE CORRECTLY
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.
C1 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 C2.
No
INSTALL a new multifunction switch. TEST the system for normal operation.
C2 CHECK FOR A SHORT TO GROUND IN THE MULTIFUNCTION SWITCH HARNESS
- Disconnect: Wiper/Washer Module C2157.
- Measure the resistance between ground and wiper/washer module:
- C2157-8, circuit CRW08 (VT/OG), harness side.
- C2157-13, circuit CRW17 (GN/VT), harness side.
- C2157-14, circuit CRW19 (BU/OG), harness side.
- C2157-6, circuit CRW18 (VT/WH), harness side.
Is the resistance greater than 10,000 ohms?
Yes
GO to C3.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
C3 CHECK FOR AN OPEN IN THE MULTIFUNCTION SWITCH HARNESS
- Measure the resistance between multifunction switch C202, harness side and wiper/washer module C2157, harness side using the following chart:
Multifunction Switch Circuit Wiper/Washer Module C202-16 CRW19 (BU/OG) C2157-14 C202-9 CRW08 (VT/OG) C2157-8 C202-12 CRW17 (GN/VT) C2157-13 C202-11 CRW18 (VT/WH) C2157-6
Is the resistance less than 5 ohms?
Yes
GO to C4.
No
REPAIR the circuit(s) in question. TEST the system for normal operation.
C4 CHECK FOR A SHORT IN THE WIPER/WASHER MODULE HARNESS
- Measure the resistance between multifunction switch C202, harness side, using the following chart:
Multifunction Switch Circuitry Multifunction Switch C202-16 CRW19 (BU/OG)/ CRW18 (VT/WH) C202-11 C202-16 CRW19 (BU/OG)/ CRW08 (VT/OG) C202-9 C202-16 CRW19 (BU/OG)/CRW17 (GN/VT) C202-12 C202-11 CRW18 (VT/WH)/CRW08 (VT/OG) C202-9 C202-11 CRW18 (VT/WH)/CRW17 (GN/VT) C202-12 C202-9 CRW08 (VT/OG)/CRW17 (GN/VT) C202-12
Is the resistance greater than 10,000 ohms for all measurements?
Yes
GO to C5.
No
REPAIR the circuit(s). TEST the system for normal operation.
C5 CHECK WIPER MOTOR LOW SPEED FOR VOLTAGE
- Connect: Wiper/Washer Module C2157.
- Connect: Multifunction Switch C202.
- Ignition ON.
- With the multifunction switch in the low position, measure the voltage between wiper motor C125-5, circuit CRW16 (GY/BN), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to C7.
No
GO to C6.
C6 CHECK WIPER MOTOR LOW SPEED FOR AN OPEN
- Ignition OFF.
- Measure the resistance between wiper motor C125-5, circuit CRW16 (GY/BN), harness side and wiper/washer module C2157-4, circuit CRW16 (GY/BN), harness side.
Is the resistance less than 5 ohms?
Yes
GO to C9.
No
REPAIR the circuit. TEST the system for normal operation.
C7 CHECK WIPER MOTOR HIGH SPEED FOR VOLTAGE
- With the multifunction switch in the high position, measure the voltage between wiper motor C125-3, circuit CRW15 (BN/WH), harness side and ground.
Is the voltage greater than 10 volts?
Yes
INSTALL a new wiper motor. REFER to Wiper Motor . TEST the system for normal operation.
No
GO to C8.
C8 CHECK WIPER MOTOR HIGH SPEED FOR AN OPEN
- Ignition OFF.
- Measure the resistance between wiper motor C125-3, circuit CRW15 (BN/WH), harness side and wiper/washer module C2157-11, circuit CRW15 (BN/WH), harness side.
Is the resistance less than 5 ohms?
Yes
GO to C9.
No
REPAIR the circuit. TEST the system for normal operation.
C9 CHECK FOR CORRECT WIPER/WASHER MODULE OPERATION
- Disconnect all wiper/washer module connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all wiper/washer module 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/washer module. REFER to Wiper/Washer Module .
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.