Windshield Wiper System Malfunction
Windshield Wiper System Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The Body Control Module (BCM) controls the wiper motor based on input from the windshield wiper/washer switch. The BCM monitors the wiper/washer switch through two separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and the windshield washer switch signal circuit is used to determine washer operation. The BCM controls the windshield wiper motor low, high, and intermittent operations through a serial data Local Interconnect Network 1 (LIN) Bus control circuit.
Reference Information
Schematic Reference
Wiper/Washer Schematics Electrical Diagrams
Steering Wheel Secondary/Configurable Control Schematics Steering Wheel Secondary/Configurable Control Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation
Wiper/Washer System Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
1. Vehicle in Service Mode, S82 Windshield Wiper/Washer Switch in the OFF position, verify the scan tool Windshield Washer Switch parameter is INACTIVE.
• If not the specified value, refer to Washer Malfunction Washer Malfunction.
2. S82 Windshield Wiper/Washer Switch in the OFF position, verify the scan tool Windshield Wiper Switch parameter is OFF.
• If not the specified value, refer to Windshield Wiper/Washer Switch Circuit Test.
3. S82 Windshield Wiper/Washer Switch in the OFF position, verify the scan tool Windshield Wiper High Speed Switch parameter is INACTIVE.
• If not the specified value, refer to Windshield Wiper/Washer Switch Circuit Test.
4. S82 Windshield Wiper/Washer Switch in the LOW position, verify the scan tool Windshield Wiper Switch parameter is LOW.
• If not the specified value, refer to Windshield Wiper/Washer Switch Circuit Test.
5. S82 Windshield Wiper/Washer Switch in the HIGH position, verify the scan tool Windshield Wiper High Speed Switch parameter is ACTIVE.
• If not the specified value, refer to Windshield Wiper/Washer Switch Circuit Test.
6. S82 Windshield Wiper/Washer Switch in the INT position, cycling the delay adjustment switch from long delay to short delay, observe the scan tool Windshield Wiper Switch parameter while cycling the delay adjustment switch from long delay to short delay. The parameter should cycle between Delay 1 through Delay 5 as each delay position is selected.
• If not the specified value, refer to Windshield Wiper/Washer Switch Circuit Test.
Circuit/System Testing
Windshield Wiper/Washer Switch Circuit Test
1. Vehicle OFF, Retained Accessory Power OFF, disconnect the X1 harness connector at the S82 Windshield Wiper/Washer Switch.
2. Verify a test lamp illuminates between terminal 2 and B+.
• If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
3. Vehicle in Service Mode, test for 9-11 V between the signal circuit terminal 3 and ground.
• If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
• If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
4. Test for B+ between the signal circuit terminal 1 and ground.
• If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. Disconnect the X3 harness connector at the K9 BCM.
6. Test for less than 1 V between terminal 20 and ground.
• If greater than the specified value, test for a short to voltage.
7. Vehicle OFF, disconnect the harness connector at the S70R steering wheel control switch - right.
8. Vehicle in Service Mode, test for B+ between the voltage reference circuit terminal 1 and ground.
• If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
9. If all circuits test normal, test or replace the S82 Windshield Wiper/Washer Switch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Windshield Wiper Motor Replacement Service and Repair
* Windshield Wiper and Washer Switch Replacement Service and Repair
* Control Module References Programming and Relearning for BCM replacement, setup, and programming