Vauxhall Workshop Service and Repair Manuals

Windscreen Wiper System Malfunction

Diagnostic Instructions

Diagnostic Fault Information

Circuit/System Description

The Body Control Module (BCM) controls the wiper motor based on input from the windscreen wiper/washer switch. The BCM monitors the wiper/washer switch through two separate signal circuits and a ground circuit. The windscreen wiper switch high signal circuit is used to determine high speed wiper operation, the windscreen wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and the windscreen washer switch signal circuit is used to determine washer operation. The BCM controls the windscreen wiper motor low, high, and intermittent operations through a LIN 1 Bus control circuit.

The wiper motor park position is controlled by the BCM and the wiper motor park switch. Once the BCM receives the wiper OFF message from the windscreen wiper/washer switch, the BCM sends a serial data message on the LIN 1 Bus circuit to the wiper motor to park. The wipers will cycle one additional time until the BCM receives the wiper motor park switch signal. Once the BCM receives this park switch signal response from the wiper motor park switch, the wiper motor will stop.

Reference Information

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, S82 Windscreen Wiper/Washer Switch in the OFF position, verify the scan tool Windscreen Washer Switch parameter is Inactive.

⇒	If not the specified value, refer to Windscreen Wiper/Washer Switch Malfunction.

2. Ignition ON, S82 Windscreen Wiper/Washer Switch in the LOW position, verify the scan tool Windscreen Wiper Switch parameter is Low.

⇒	If not the specified value, refer to Windscreen Wiper/Washer Switch Malfunction.

3. Ignition ON, S82 Windscreen Wiper/Washer Switch in the HIGH position, verify the scan tool Windscreen Wiper High Speed Switch parameter is Active.

⇒	If not the specified value, refer to Windscreen Wiper/Washer Switch Malfunction.

4. Ignition ON, S82 Windscreen Wiper/Washer Switch in the INT position, cycling the delay adjustment switch from long delay to short delay. Observe the scan tool Windscreen 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 Windscreen Wiper/Washer Switch Malfunction.

Circuit/System Testing

Windscreen Wiper/Washer Switch Malfunction

1. Ignition OFF, Retained Accessory Power OFF, disconnect the X1 harness connector at the S82 Windscreen Wiper/Washer Switch.
2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal 2 and ground.

⇒	If greater than the specified value, test the ground circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.

3. Disconnect the X3 harness connector at the K9 Body Control Module.
4. Test for less than 5 Ω between the signal circuit terminal 3 X1 at the S82 Windscreen Wiper/Washer Switch and the signal circuit terminal 13 X3 at the K9 Body Control Module.

⇒	If greater than the specified value, test the signal circuit for an open/high resistance or a short to voltage.

5. Test for less than 5 Ω between the signal circuit terminal 5 X1 at the S82 Windscreen Wiper/Washer Switch and the signal circuit terminal 25 X3 at the K9 Body Control Module.

⇒	If greater than the specified value, test the signal circuit for an open/high resistance or a short to voltage.

6. Test for less than 5 Ω between the signal circuit terminal 1 X1 at the S82 Windscreen Wiper/Washer Switch and the signal circuit terminal 20 X3 at the K9 Body Control Module.

⇒	If greater than the specified value, test the signal circuit for an open/high resistance or a short to voltage.

7. Test for infinite resistance between the signal circuit terminal 3 X1 at the S82 Windscreen Wiper/Washer Switch and ground.

⇒	If not the specified value, test the signal circuit for a short to ground.

8. Test for infinite resistance between the signal circuit terminal 5 X1 at the S82 Windscreen Wiper/Washer Switch and ground.

⇒	If not the specified value, test the signal circuit for a short to ground.

9. Test for infinite resistance between the signal circuit terminal 1 X1 at the S82 Windscreen Wiper/Washer Switch and ground.

⇒	If not the specified value, test the signal circuit for a short to ground.

10. If all circuits test normal, test or replace the S82 Windscreen Wiper/Washer Switch.

Windscreen Wiper Motor Malfunction - Left Hand Drive

1. Ignition OFF, Retained Accessory Power OFF, disconnect X1 harness connector at M75 Windscreen Wiper Motor.
2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.

⇒	If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between B+ voltage circuit terminal 1 and ground.

⇒	If the test lamp does not illuminate, test the B+ voltage circuit for a short to ground or an open/high resistance.

4. Ignition ON, test for 4-12 V between the communication signal circuit terminal 4 and ground.

⇒	If not the specified range, test the signal circuit for an open/high resistance and a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.

5. If all circuits test normal, replace the M75 Windscreen Wiper Motor.

Windscreen Wiper Motor Malfunction - Right Hand Drive

1. Ignition OFF, Retained Accessory Power OFF, disconnect the harness connector at the M75 Windscreen Wiper Motor.
2. Test for less than 5 Ω between the ground circuit terminal 3 and ground.

⇒	If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between B+ voltage circuit terminal 4 and ground.

⇒	If the test lamp does not illuminate, test the B+ voltage circuit for a short to ground or an open/high resistance.

4. Ignition ON, test for 4-12 V between the communication signal circuit terminal 1 and ground.

⇒	If not the specified range, test the signal circuit for an open/high resistance and a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.

5. If all circuits test normal, replace the M75 Windscreen Wiper Motor.

Wiper Motor Park Switch Malfunction - Left Hand Drive

1. Ignition OFF, disconnect X1 harness connector at M75 Windscreen Wiper Motor.
2. Ignition ON, with the S82 Windscreen Wiper/Washer Switch in the HIGH position, test for 11-14 V between the park signal circuit terminal 3 X1 at the M75 Windscreen Wiper Motor and ground.

⇒	If less then the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

3. If all circuits test normal, replace the M75 Windscreen Wiper Motor.

Wiper Motor Park Switch Malfunction - Right Hand Drive

1. Ignition OFF, disconnect X1 harness connector at M75 Windscreen Wiper Motor.
2. Ignition ON, with the S82 Windshield Wiper/Washer Switch in the HIGH position, test for 11-14 V between the park signal circuit terminal 2 X1 at the M75 Windshield Wiper Motor and ground.

⇒	If less then the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

3. If all circuits test normal, replace the M75 Windscreen Wiper Motor.

Component Testing

Multifunction Switch - Static Test

1. Disconnect the X1 harness connector at the S82 Windscreen Wiper/Washer Switch.
2. With the S82 Windscreen Wiper/Washer Switch in the HIGH position, test for less than 5 Ω between the terminal 2 and the signal terminal 1.

⇒	If greater than the specified value, replace the S82 Windscreen Wiper/Washer Switch.

3. While cycling the S82 Windscreen Wiper/Washer Switch through each delay and speed position, test for the specified resistance between the low reference terminal 2 and the signal terminal 3.

Note:  If the switch tests open in any switch position other than OFF, test the signal circuits for a short to voltage before replacing the switch.

Wiper Switch Values

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.