Windshield Wiper System Malfunction
Windshield Wiper System Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The windshield wiper/washer module is part of the windshield wiper motor cover and controls wiper motor operation. The accessory voltage supplied to the windshield wiper motor assembly is used to operate the wiper motor in all modes. The windshield wiper motor is a 2 speed motor and is operated at low speed in all modes except HIGH. When the wiper/washer switch is activated, battery voltage is applied through the switch contacts, a series of resistors, and through the wiper switch signal circuits to the wiper/washer module. The voltage level of these signal circuits determine the windshield wiper/washer modes of operation.
Reference Information
Schematic Reference
Wiper/Washer Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Wiper/Washer System Description and Operation (STS) (Description and Operation)Wiper/Washer System Description and Operation (STS-V) (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, verify wiper motor operation in all switch positions.
If the wiper motor is inoperative in all modes, refer to Wiper Motor/Module Circuit Test.
If the wiper motor is inoperative in high or all low speed modes only, refer to Wiper Motor Switch Circuit Test.
If the wiper motor is inoperative in delay modes, low, or mist, but operates in wash mode, test or replace the turn signal/multifunction switch.
Circuit/System Testing
Wiper Motor Switch Circuit Test
1. Disconnect the X202, harness connectors at the windshield wiper switch.
2. Ignition ON, test for 11.0-13.0 volts between the 12-volt reference circuit terminal N and ground.
• If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Wiper Motor/Module Circuit Test.
3. Install a 3A fused jumper wire between the signal circuit terminal H and the 12-volt reference circuit terminal N. Ignition ON, verify the wiper motor operates in the wash mode.
• If the wiper motor does not operate, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, refer to Wiper Motor/Module Circuit Test.
4. Install a 3A fused jumper wire between the signal circuit terminal K and ground. Ignition ON, verify the wiper motor operates in the high speed mode.
• If the wiper motor does not operate, test the signal circuit for an open/high resistance. If the circuit tests normal, refer to Wiper Motor/Module Circuit Test.
5. If all circuits test normal, replace the turn signal/multifunction switch.
Wiper Motor/Module Circuit Test
1. Ignition OFF, disconnect the harness connector at the windshield wiper motor cover.
2. Test for less than 1.0 ohm between the ground circuit terminal D and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminal E and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Remove the wiper motor cover.
5. Connect the harness connector at the windshield wiper motor cover.
6. Connect a test lamp between the circuit board terminals T1 and T3.
7. Ignition ON, wiper switch in low, verify the test lamp turns on for 15 seconds.
• If the test lamp does not turn on, replace the wiper motor cover.
8. If all circuits test normal, replace the windshield wiper motor.
Component Testing
1. Ignition OFF, disconnect the harness connectors at the windshield wiper switch.
2. Test the resistance between terminals N and K. Rotate the wiper switch and compare the resistance readings to the values in the Windshield Wiper Switch Values table below for WASH, MIST, each DELAY and LOW speed.
• If the resistance is not within the specified range, replace the turn signal/multifunction switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Turn Signal Multifunction Switch Replacement (Turn Signal Multifunction Switch Replacement)
* Windshield Wiper Transmission Replacement (Service and Repair)
* Windshield Wiper Motor Replacement (Service and Repair)