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Wiper System and Washer System Buick Regal V

Wiper/washer Systems 17 illustrations ~6379 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Windshield Wiper Arm35 N.m26 lb ft

Fastener Tightening Specifications

Scheme 1

Scheme 1: Wiper/Washer Wiring Schematics
Scheme 1: Wiper/Washer Wiring Schematics

Diagnostic Code Index

DTCDescription
DTC B3715 or B3875DTC B3715 02 Windshield Wiper Relay Circuit Short to Ground DTC B3715 04 Windshield Wiper Relay Circuit Open DTC B3875 01 Windshield Wiper High Speed Relay Circuit Short to Battery DTC B3875 02 Windshield Wiper High Speed Relay Circuit Short to Ground DTC B3875 04 Windshield Wiper High Speed Relay Circuit Open
DTC B3873DTC B3873 02 Front Washer Relay Circuit Short to Ground

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Windshield Wiper High Speed Relay B+1, 21, 2
Windshield Wiper Switch Low Signal111
Windshield Wiper Switch High Signal422
Windshield Wiper Motor Park Switch Signal33
Front Wiper Relay ControlB3715 02B3715 044
Windshield Wiper High Speed Relay ControlB3875 02B3875 04B3875 01
Windshield Wiper High Speed Relay Control224
Windshield Wiper Switch Low Reference1, 21, 2
Windshield Wiper Motor Ground1, 2, 3
Front Wiper Relay Ground1
1. Delay or Low Speed Wipers Inoperative 2. High Speed Wipers Inoperative 3. Wipers Do Not Park 4. Wipers Always ON

Circuit/System Description

The Body Control Module (BCM) controls the windshield 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 windshield washer switch signal circuit is used to determine washer operation.

The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low.

Conditions for Running the DTC

  1. The DTC runs only when a wiper output is actively being requested by the BCM.
  2. The system voltage is between 9-16 V.

Conditions for Setting the DTC

DTC B3715 02

A short to ground is detected in the windshield wiper relay control circuit.

DTC B3715 04

An open/high resistance is detected in the windshield wiper relay control circuit.

DTC B3875 01

A short to voltage is detected in the windshield wiper speed control relay control circuit.

DTC B3875 02

A short to ground is detected in the windshield wiper speed control relay control circuit.

DTC B3875 04

An open/high resistance is detected in the windshield wiper speed control relay control circuit.

Action Taken When the DTC Sets

The BCM will not activate the wiper output.

Conditions for Clearing the DTC

  1. A current DTC will clear when the condition for setting the fault is no longer present.
  2. A history DTC will clear after 50 consecutive ignition cycles without a fault present.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for diagnostic tester information.

Circuit/System Testing

DTC B3715

  1. Ignition OFF, disconnect the KR12B windshield wiper relay.
  2. Test for less than 5 ohms between the ground circuit terminal 85 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 86 and ground.
  4. Ignition ON, command the low speed wipers ON and OFF using the S82 windshield wiper/washer switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, test or replace the KR12B windshield wiper relay.

DTC B3875

  1. Ignition OFF, disconnect the KR12C windshield wiper speed control relay.
  2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 85 and ground. If the test lamp does not illuminate, test or replace the X50A underhood fuse block.
  3. Connect a test lamp between the control circuit terminal 86 and B+.
  4. Command the high speed wipers ON and OFF using the S82 windshield wiper/washer switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, test or replace the windshield KR12C wiper speed control relay.

Component Testing

Relay Test

  1. Ignition OFF, disconnect the appropriate relay.
  2. Test for 60-200 ohms between terminals 85 and 86. If the resistance is not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
  4. Test for less than 5 ohms between terminals 30 and 87A. If greater than the specified value, replace the relay.
  5. Install a 10 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 5 ohms between terminals 30 and 87. If greater than the specified range, replace the relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Windshield Washer Switch Signal211
Windshield Washer Fluid Pump Control112
Windshield Washer Relay ControlB3873 0212
Windshield Washer Fluid Pump Ground11
1. Front Washer Inoperative 2. Front Washer Always ON

The body control module (BCM) controls the windshield washer fluid pump based on an input from the window wiper/washer switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the wash switch is closed, ground is supplied to the front washer switch signal circuit. When this is the case, the BCM will command the windshield washer fluid pump and the low speed wipers on.

  1. Ignition ON.
  2. The system voltage is between 9-16 V.

A short to ground is detected in the windshield washer relay control circuit.

Washer operation is suspended.

A current DTC clears when the diagnostic runs and passes.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, Retained Accessory Power OFF, disconnect the harness connector X4 at the K9 body control module.
  2. Test for 120-160 ohms between control terminal 14 and ground. If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X50A underhood fuse block. If greater than the specified value, test the control circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the X50A underhood fuse block.
  3. If all circuits test normal, test or replace the K9 body control module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Windshield Washer Pump Replacement»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  2. «Fuse Block Replacement»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup

Symptoms - Wiper/Washer Systems

Note. The following steps must be completed before using the symptom tables

  1. Perform «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) , in order to verify that all of the following conditions are true: No DTCs are set. The control modules can communicate via the serial data link.
  2. Refer to «Wiper/Washer System Description and Operation»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) in order to familiarize yourself with the system functions.

Visual/Physical Inspection

  1. Inspect for aftermarket devices which may affect the operation of the windshield wiper/washer system. Refer to «Checking Aftermarket Accessories»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which may cause the symptom.
  3. Inspect the washer fluid reservoir for the proper fluid level.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Windshield Wiper System Malfunction»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  2. «Washer Malfunction»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Windshield Wiper High Speed Relay B+1, 21, 2
Windshield Wiper Switch Low Signal111
Windshield Wiper Switch High Signal422
Windshield Wiper Switch Low Reference1, 21, 2
Windshield Wiper Motor Park Switch Signal33
Windshield Wiper Relay ControlB3715 02B3715 04B3715 01
Windshield Wiper High Speed Relay ControlB3875 02B3875 04B3875 01
Windshield Wiper Relay Ground1
Windshield Wiper Motor High Speed Control224
Windshield Wiper Motor Low Speed Control114
Windshield Wiper Motor Ground1, 2, 3
1. Delay or Low Speed Wipers Inoperative 2. High Speed Wipers Inoperative 3. Wipers Do Not Park 4. Wipers Always ON

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 through two output controls, controlling two relays which determine the desired wiper speed, high or low.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ignition ON, 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»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  2. Wiper switch in the OFF position, verify the scan tool Windshield Wiper Switch parameter is OFF. If not the specified value, refer to the Windshield Wiper/Washer Switch Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  3. Wiper switch in the OFF position, verify the scan tool Windshield Wiper High Speed Switch parameter is INACTIVE. If not the specified value, refer to the Windshield Wiper/Washer Switch Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  4. Wiper switch in the LO position, verify the scan tool Windshield Wiper Switch parameter is LOW. If not the specified value, refer to the Windshield Wiper/Washer Switch Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  5. Wiper switch in the HIGH position, verify the scan tool Windshield Wiper High Speed Switch parameter is ACTIVE. If not the specified value, refer to the Windshield Wiper/Washer Switch Circuit Test «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  6. Wiper switch in the INT position, 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 D1 and D5 as each delay position is selected. If not the specified value, test or replace the S82 windshield wiper/washer switch.
  7. Wiper switch in the LO position, verify the windshield wipers are cycling at the low speed. If the wipers are not operating at low speed, refer to Windshield Wiper Motor Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  8. Wiper switch in the HIGH position, verify the windshield wipers are cycling at the high speed. If the wipers are not operating at high speed, refer to Windshield Wiper Motor Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  9. Observe the scan tool BCM Wiper Park Switch parameter. The reading should display ACTIVE when the wipers are parked and INACTIVE with the wipers ON or out of the park position. If the Wiper Park Switch parameter is always ACTIVE or INACTIVE or the wipers do not park, refer to the Wiper Park Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

Windshield Wiper/Washer Switch Circuit Test

  1. Ignition OFF, disconnect the harness connector at the S82 windshield wiper/washer switch.
  2. With RAP OFF, MDI disconnected, wait one minute, test for less than 30 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  3. Ignition ON, 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.
  4. Test for B+ 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.
  5. If all circuits test normal, test or replace the S82 windshield wiper/washer switch.

Windshield Wiper Motor Circuit Test

  1. Ignition OFF, disconnect KR12B windshield wiper relay.
  2. Test for less than 5 ohms between the ground circuit terminal 85 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for less than 5 ohms between the ground circuit terminal 87A and ground. If greater than the specified range, test or replace the X50A underhood fuse block.
  4. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 87 and ground. If the test lamp does not illuminate, test or replace the X50A underhood fuse block.
  5. Install a test lamp between the control circuit terminal 86 and the ground.
  6. Command the low speed wipers ON and OFF using the S82 windshield wiper/washer switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  7. Ignition OFF, disconnect the KR12C windshield wiper speed control relay.
  8. Test for less than 5 ohms between the control circuit terminal 30 of the KR12B windshield wiper relay and the control circuit terminal 30 of the KR12C windshield wiper speed control relay. If greater than the specified range, test or replace the X50A underhood fuse block.
  9. Connect the KR12B windshield wiper relay.
  10. Test for less than 5 ohms between the control circuit terminal 30 of the KR12C windshield wiper speed control relay and ground. If greater than the specified range, test or replace the KR12B windshield wiper relay.
  11. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 85 of the KR12C windshield wiper speed control relay and ground. If the test lamp does not illuminate, test or replace the X50A underhood fuse block.
  12. Install a test lamp between the control circuit terminal 30 of the KR12C windshield wiper speed control relay and ground.
  13. Command the LOW speed wipers ON using the S82 windshield wiper/washer switch. The test lamp should illuminate when commanding the LOW speed wipers ON. If the test lamp does not illuminate, test or replace the KR12B windshield wiper relay.
  14. Connect a test lamp between the control circuit terminal 86 of the KR12C windshield wiper speed control relay and B+.
  15. Command the high speed wipers ON and OFF using the S82 windshield wiper/washer switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  16. Ignition OFF, connect the KR12C windshield wiper speed control relay and disconnect the harness connector at the M75 windshield wiper motor.
  17. Test for less than 5 ohms between the ground circuit terminal D and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  18. Connect a test lamp between the control circuit terminal B and ground.
  19. Ignition ON, command the LOW speed wipers ON and OFF using the S82 windshield wiper/washer switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the KR12C windshield wiper speed control relay. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the KR12C windshield wiper speed control relay.
  20. Connect a test lamp between the control circuit terminal A and ground.
  21. Command the HIGH speed wipers ON and OFF using the S82 windshield wiper/washer switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the KR12C windshield wiper speed control relay. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the KR12C windshield wiper speed control relay.
  22. If all circuits test normal, test or replace the M75 windshield wiper motor.

Wiper Park Circuit Test

  1. Ignition OFF, disconnect the harness connector at the M75 windshield wiper motor.
  2. Ignition ON, test for B+ between signal circuit terminal C and ground. If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the K9 BCM.
  3. If the circuit tests normal, test or replace the M75 windshield wiper motor.

Windshield Wiper/Washer Switch - Static Test

  1. Disconnect the harness connector at the S82 windshield wiper/washer switch.
  2. With the S82 windshield wiper/washer switch in the HIGH position, test for less than 5 ohms between the terminal 2 and the signal terminal 1. If greater than the specified value, replace the S82 windshield wiper/washer switch.
  3. While cycling the S82 windshield 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.

Switch PositionResistance
OffInfinite
Mist300-364 ohms
Delay 13.70-4.10 kohms
Delay 22.60-3.20 kohms
Delay 31.80-2.20 kohms
Delay 41.10-1.50 kohms
Delay 5650-1000 ohms
Low300-364 ohms
High300-364 ohms

Wiper Switch Values

  1. If any switch position is not within the specified range, replace the S82 windshield wiper/washer switch.

Windshield Wiper Motor - Dynamic Test

  1. Ignition OFF, disconnect the harness connector at the M75 windshield wiper motor.
  2. Install a 25 A fused jumper wire between the control terminal B and 12 V. Install a jumper wire between the ground terminal D and ground.
  3. Verify the M75 windshield wiper motor is operating in the low speed mode. If the M75 windshield wiper motor is not in the low speed mode, replace the M75 windshield wiper motor.
  4. Install a 25 A fused jumper wire between the control terminal A and 12 V. Install a jumper wire between the ground terminal D and ground.
  5. Verify the M75 windshield wiper motor is operating in the high speed mode. If the M75 windshield wiper motor is not in the high speed mode, replace the M75 windshield wiper motor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Windshield Wiper Motor Replacement»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  2. «Relay Replacement (Within an Electrical Center)»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) , «Relay Replacement (Attached to Wire Harness)»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  3. «Windshield Wiper and Washer Switch Replacement»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  4. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Windshield Washer Switch Signal211
Windshield Washer Fluid Pump Control112
Windshield Washer Relay ControlB3873 0212
Windshield Washer Fluid Pump Ground1
Washer Fluid Level Switch Signal433
Washer Fluid Level Switch Ground3
1. Front Washer Inoperative 2. Front Washer Always ON 3. Washer Fluid Level Indicator Inoperative 4. Washer Fluid Level Indicator Always ON

The body control module (BCM) controls the windshield washer fluid pump based on an input from the wiper/washer switch. The BCM monitors the washer switch through the wiper/washer switch signal circuit. When the wash switch is closed, ground is supplied to the windshield washer switch signal circuit. When this is the case, the BCM will command the windshield washer fluid pump and the low speed wipers on.

On some vehicles warning information (wash fluid low) will be conveyed via the GMLAN to the controls and displays subsystem (responsible for display). This subsystem will provide visual feedback to the customer while in the RUN power mode.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool Windshield Washer Switch parameter while pressing and releasing the washer switch. The reading should change between INACTIVE and ACTIVE. If the reading does not change between INACTIVE and ACTIVE, refer to Windshield Washer Switch Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  2. Command the Windshield Washer Relay Command ON and OFF with a scan tool. The windshield washers should turn ON and OFF when changing between the commanded states. If windshield washers do not turn ON and OFF, refer to the Washer Pump Circuit Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  3. Verify the windshield washer fluid level is above the minimum level. If not above the minimum level, fill the reservoir and inspect for leaks. If the low washer fluid indicator is still ON, refer to Low Washer Fluid Inidicator Test in «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Windshield Washer Switch Circuit Test

  1. Ignition OFF, disconnect the harness connector at the S82 windshield wiper/washer switch.
  2. With RAP OFF, MDI disconnected, wait one minute, test for less that 5 ohms between the low reference terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  3. Ignition ON, verify the scan tool Windshield Washer Switch parameter is INACTIVE. If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 BCM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground. Verify the scan tool Windshield Washer Switch parameter is ACTIVE. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, test or replace the S82 windshield wiper/washer switch.

Washer Pump Circuit Test

  1. Ignition OFF, disconnect the X2 harness connector at the X50A underhood fuse block.
  2. Connect a test lamp between the control circuit terminal 60 and ground.
  3. Ignition ON, command the Windshield Washer Relay Command ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  4. Ignition OFF, connect the X2 harness at the X50A underhood fuse block and disconnect the harness connector at the G24 windshield washer pump.
  5. Test for less than 5 ohms between the ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Connect a test lamp between control circuit terminal 1 and ground.
  7. Ignition ON, command the Windshield Washer Relay Command ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the X50A underhood fuse block. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A underhood fuse block.
  8. If all circuits test normal, test or replace the G24 windshield washer pump.

Low Washer Fluid Indicator Malfunction

  1. Ignition OFF, disconnect the harness connector at the B118B windshield washer fluid level sensor.
  2. Test for less than 5 ohms between the ground terminal B and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Washer Fluid Level Switch parameter is OFF. If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the P16 instrument cluster.
  4. Install a 3 A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Washer Fluid Level Switch parameter is ON. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 instrument cluster.
  5. If all circuits test normal, test or replace the B118B windshield washer fluid level sensor.

Washer Switch Test

  1. Ignition OFF, disconnect the harness connector at the S82 windshield wiper/washer switch.
  2. Test for less than 5 ohms between the signal circuit terminal 5 and ground. If not the specified value, replace the S82 windshield wiper/washer switch.

Washer Pump Malfunction

  1. Ignition OFF, disconnect the harness connector at the G24 windshield washer pump.
  2. Install a 10 A fused jumper wire between the control terminal 1 and 12 V. Install a jumper wire between the ground terminal 2 and ground.
  3. Ignition ON, verify the G24 windshield washer pump is activated. If the G24 windshield washer pump does not activate, replace the G24 windshield washer pump.

Low Washer Fluid Indicator Malfunction

  1. Ignition OFF, remove the B118B windshield washer fluid level sensor.
  2. Install a wire at terminal A and terminal B. Observe the resistance while moving the level switch.
  3. The resistance should be changing between less than 5 ohms to infinite resistance while moving the level switch. If not the specified range, replace the B118B windshield washer fluid level sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Windshield Wiper and Washer Switch Replacement»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  2. «Windshield Washer Pump Replacement»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup

Scheme 2

Scheme 2: Windshield Wiper and Washer Switch Replacement
Scheme 2: Windshield Wiper and Washer Switch Replacement
CalloutComponent Name
Preliminary Procedure Remove the steering column trim covers. Refer to Steering Column Trim Cover Replacement .
1Windshield Wiper and Washer Switch Procedure Disconnect any electrical connectors as needed. Release the plastic retaining tabs and remove the windshield wiper and washer switch from the turn signal switch bracket.

Windshield Wiper and Washer Switch Replacement

Scheme 3

Scheme 3: Windshield Washer Nozzle Hose Replacement
Scheme 3: Windshield Washer Nozzle Hose Replacement
CalloutComponent Name
Preliminary Procedures Remove the air inlet grille panel. Refer to Air Inlet Grille Panel Replacement . Disconnect the washer container hose from the "T" connection at the windshield washer nozzle hose assembly in the plenum. Remove the windshield washer nozzle hose from the plenum.
1Windshield Washer Nozzle Hose Assembly TIP: Prime the windshield washer pump after the new hose installation.

Windshield Washer Nozzle Hose Replacement

Scheme 4

Scheme 4: Windshield Washer Nozzle Replacement
Scheme 4: Windshield Washer Nozzle Replacement
CalloutComponent Name
Preliminary Procedure Remove the air inlet grille panel assembly. Refer to Air Inlet Grille Panel Replacement .
1Windshield Washer Nozzle (Qty: 2) TIP: Depress the two washer nozzle tabs and push outward in order to remove the nozzle from the air inlet grille panel assembly.

Windshield Washer Nozzle Replacement

Scheme 5

Scheme 5: Windshield Washer Solvent Container Filler Tube Replacement
Scheme 5: Windshield Washer Solvent Container Filler Tube Replacement
CalloutComponent Name
Preliminary Procedure Open and support the hood. Reach into the engine compartment at the windshield washer solvent container fill tube side and grasp the fill tube neck. With a slight turn and upward pull, remove the fill tube from the top of the windshield washer solvent container. Inspect the fill tube grommet in the top of the washer container.
1Windshield Washer Solvent Container Fill Tube Procedure Lubricate the end of the fill tube with clean windshield washer solvent prior to installing the fill tube into the top of the windshield washer container. Slowly press the fill tube neck into the windshield washer container seal. Ensure the top of the fill tube tab locks into the tab on the front compartment fuse block housing. Once connected, push downward in order to engage the fill tube.

Windshield Washer Solvent Container Filler Tube Replacement

Scheme 6

Scheme 6: Windshield Washer Solvent Container Replacement
Scheme 6: Windshield Washer Solvent Container Replacement
CalloutComponent Name
Preliminary Procedures Remove the windshield washer solvent container fill tube. Refer to Windshield Washer Solvent Container Filler Tube Replacement . Remove the front LH wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement . Disconnect the windshield washer pump and level sensor electrical connectors. Disconnect the electrical harness from the washer container. Disconnect the windshield washer pump hose from the pump and the washer container.
1Windshield Washer Container Nut (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten 10 N.m (89 lb in)
2Windshield Washer Solvent Container Assembly Procedure Lift the windshield washer container off the three studs securing the container to the vehicle. Drain the windshield washer solvent from the container into a suitable clean drain pan. Transfer parts as needed.
CAUTION
Refer to Fastener Caution .

Windshield Washer Solvent Container Replacement

Scheme 7

Scheme 7: Windshield Washer Pump Replacement
Scheme 7: Windshield Washer Pump Replacement
CalloutComponent Name
Preliminary Procedure Remove the LF wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement . Disconnect the windshield washer pump electrical connector. Disconnect the windshield washer pump hose from the washer pump spout. Place a clean suitable drain pan under the washer pump area in order to contain loss windshield washer solvent. Pull the top of the washer pump outward in order to disengage the top of the washer pump from the windshield washer container. Use two medium sized flat-bladed tools under the washer pump grommet and pry in opposite, disengage the washer pump from the windshield washer container. Remove and discard the windshield washer pump and grommet.
1Windshield Washer Pump Assembly TIP: Refill the windshield washer container after the washer pump replacement.

Windshield Washer Pump Replacement

Scheme 8

Scheme 8: Windshield Washer Solvent Level Sensor Replacement
Scheme 8: Windshield Washer Solvent Level Sensor Replacement
CalloutComponent Name
Preliminary Procedure Remove the LF wheelhouse liner. Refer to Front Wheelhouse Front Liner Replacement . Disconnect the windshield washer level sensor electrical connector. Place a clean suitable drain pan under the level sensor area in order to contain the loss windshield washer solvent. Use two medium sized flat-bladed tools under the level sensor grommet and pry in opposite directions, disengage the level sensor from the windshield washer container. Remove and discard the level sensor grommet.
1Windshield Washer Solvent Container Level Sensor
2Windshield Washer Solvent Container Level Sensor Grommet Procedure Top off the windshield washer solvent container with new windshield washer solvent.

Windshield Washer Solvent Level Sensor Replacement

Scheme 9

Scheme 9: Plenum Water Deflector Support Replacement
Scheme 9: Plenum Water Deflector Support Replacement
CalloutComponent Name
Preliminary Procedures Open and support the hood assembly. Remove the air inlet grille panel assembly. Refer to Air Inlet Grille Panel Replacement . Remove the air inlet grille panel water deflector. Refer to Air Inlet Grille Panel Water Deflector Replacement .
1Push Pin Retainer (Qty: 2)
2Plenum Water Deflector Support Screw (Qty: 4)
3Plenum Water Deflector Support

Plenum Water Deflector Support Replacement

Scheme 10

Scheme 10: Air Inlet Grille Panel Replacement
Scheme 10: Air Inlet Grille Panel Replacement
CalloutComponent Name
Preliminary Procedures Remove both windshield wiper arm assemblies. Refer to Windshield Wiper Arm Replacement . Remove both air inlet grille panel side seals. Refer to Air Inlet Grille Panel Side Seal Replacement .
1Push-Pin Retainer (Qty: 4) TIP: Lift the center of the push pin, then remove the lower portion from the grille panel.
2Air Inlet Grille Panel Procedure Disconnect the hood rear weather-strip from the air inlet panel flange. Lift the front edge of the air inlet panel upward off the plenum edge far enough to clear the wiper motor pivot shafts. Disengage the washer hose from the bottom edge of the panel. Starting at the rear corner of the air inlet grille, lift the grille from the windshield trim and release across to the other side before pulling the air inlet grille forward. Pull the grille forward to disengage the rear edge of the grille panel from the bottom of the windshield edge. Pull the air inlet grille panel from around both hood hinges. Angle the air inlet grille to clear the hood strut assembly. Transfer the windshield washer nozzles. Refer to Windshield Washer Nozzle Replacement .

Air Inlet Grille Panel Replacement

Scheme 11

Scheme 11: Air Inlet Grille Panel Side Seal Replacement
Scheme 11: Air Inlet Grille Panel Side Seal Replacement
CalloutComponent Name
Preliminary Procedure Open and support the hood to gain better access to the side air inlet grille panel side seal.
1Air inlet Grille Panel Side Seal Procedure The air inlet grille panel side seal has integral retention features that are not removable, but must be inserted with minimal force in the various locations. Install the air inlet grille panel side seal in the mandatory sequence, as shown. 1 to the A-pillar trim edge 2 the integral tab inserted to the rear edge of the fender 3 to the air inlet panel slot 4 to the outer edge of the air inlet panel 5 tucked under the rear edge of the front fender flange Ensure the air inlet grille panel side seal has no wrinkles and fits smooth to the windshield edge and A-pillar.

Air Inlet Grille Panel Side Seal Replacement

Scheme 12

Scheme 12: Air Inlet Grille Panel Water Deflector Replacement
Scheme 12: Air Inlet Grille Panel Water Deflector Replacement
CalloutComponent Name
Preliminary Procedures Open and support the hood assembly. Remove the air inlet grille panel assembly. Refer to Air Inlet Grille Panel Replacement .
1Push Pin Retainer
2Air Inlet Water Deflector Assembly Procedure Once the push pin retainer has been removed, lift the front edge upward and pull the deflector from under the edge of the plenum upper panel.

Air Inlet Grille Panel Water Deflector Replacement

Scheme 13

Scheme 13: Windshield Wiper Arm Replacement
Scheme 13: Windshield Wiper Arm Replacement
CalloutComponent Name
1Windshield Wiper Arm Finish Cap TIP: Use a small flat-bladed tool to remove finish cap.
2Windshield Wiper Arm Fastener CAUTION: Refer to Fastener Caution . Procedure Locate the transparent circle with a black dot in the center at the lower windshield blackout area. Position the windshield wiper arm to the pivot shaft so that the wiper blade is centered across the transparent circle. Lift the arm blade portion while pushing down the arm onto the pivot shaft. Install the windshield wiper arm fastener. Hold the windshield wiper arm stationary in position as previously stated. Torque the windshield wiper arm fastener. Release the windshield wiper arm. Repeat the same procedure for the other windshield wiper arm. Tighten 35 N.m (26 lb ft)
3Windshield Wiper Arm
CAUTION
Refer to Fastener Caution .

Windshield Wiper Arm Replacement

Scheme 14

Scheme 14: Windshield Wiper Blade Replacement
Scheme 14: Windshield Wiper Blade Replacement
CalloutComponent Name
Preliminary Procedure Raise the wiper arm up off the windshield.
1Windshield Wiper Blade Cap TIP: Use a small flat-bladed tool to open the cap.
2Windshield Wiper Blade Procedure Push upward the windshield wiper blade. Slide the windshield wiper blade from the wiper arm. Carefully release the wiper arm back to the windshield.
3Windshield Washer Blade TIP: Discard if rubber appears worn or does not wipe the windshield clean.

Windshield Wiper Blade Replacement

Scheme 15

Scheme 15: Windshield Wiper Motor Replacement
Scheme 15: Windshield Wiper Motor Replacement
CalloutComponent Name
Preliminary Procedure Remove the windshield wiper transmission. Refer to Windshield Wiper Transmission Replacement .
1Windshield Wiper Motor Bolt (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten 10 N.m (89 lb in)
2Windshield Wiper Motor Assembly Procedure The NEW wiper motor is shipped with the crank arm out of the PARK Position. Using the J-39232 separator or equivalent, disconnect the crank arm ball socket from the wiper transmission link. Using the J-39529 installer or equivalent, connect the crank arm ball socket to the wiper transmission link. Install the NEW wiper motor to the transmission as shipped. Install the windshield wiper transmission. Refer to Windshield Wiper Transmission Replacement . Special Tools J-39232 Wiper Linkage Separator J-39529 Wiper Linkage Installer For equivalent regional tools, refer to Special Tools .
CAUTION
Refer to Fastener Caution .

Windshield Wiper Motor Replacement

Scheme 16

Scheme 16: Windshield Wiper Transmission Replacement
Scheme 16: Windshield Wiper Transmission Replacement
CalloutComponent Name
Preliminary Procedure Remove the air inlet grille panel. Refer to Air Inlet Grille Panel Replacement . Remove the dash panel bolts and brace.
1Windshield Wiper Transmission Bolt (Qty: 3) CAUTION: Refer to Fastener Caution . Procedure Lift the windshield wiper transmission from the plenum. Disconnect the electrical connector from the windshield wiper motor. Remove the windshield wiper transmission from the vehicle. Tighten 9 N.m (80 lb in)
2Windshield Wiper Motor Crank Arm
3Windshield Wiper Motor Bolt (Qty 3) Procedure Remove the windshield wiper motor. Refer to Windshield Wiper Motor Replacement .
4Windshield Wiper Motor
5Windshield Wiper Transmission Assembly
CAUTION
Refer to Fastener Caution .

Windshield Wiper Transmission Replacement

Special Tools

  1. BO-46974 Glass Removal System
  2. BO-641 Suction Holder

For equivalent regional tools, refer to Special Tools .

Non-Destructive Glass Removal

  1. Prescribed tools such as wire cutter are in working order
  2. Adhesive height / width of adhesive bead should be no less than 13 mm / 8 mm (0.5 in / 0.3 in)
  3. Additional cost or damage is not anticipated until you go outside this geometry (at vulcanized trim strips and paintwork, for example)
  4. Protect heating line connections

Check Paintwork

  1. Check paintwork after removal, particularly in the body frame area
  2. Clean, prime and apply top coat to bare areas
  3. Make good minor surface damage with a paint stick

Note. Never use glass primer (formation of corrosion). Glass primer is for protection against UV light only, and is therefore only applied to the pane of glass.

Pane of Glass

  1. Treat new panes of glass with glass primer in the adhesive areas
  2. To re-install panes of glass that have already been cut out, do not apply glass primer to the PU vulcanization or on residual adhesive that has been cut through (substandard adhesion)
  3. Apply new adhesive as per instructions, insert pane of glass into body frame and fix in position with fabric tape

Waiting Periods

Pay attention to waiting period for window depending on type of glass and vehicle equipment (airbag).

Tools, Auxiliary Equipment

  1. Assembly stand - normal commercial
  2. BO-46974 Glass Removal System
  3. Video VT 54
  4. Gun for EU cartridge up to 310 ml - normal commercial
  5. BO-641 Suction Holder
  6. Adhesive (not electrically conductive) see delivery program (our Parts Releases area)
  7. Paint stick (our Parts Releases area)
  8. Fabric tape

Note. Use provided protective glasses and gloves from BO-46974 glass removal system. Regulation / safety: pay attention to waiting periods for vehicles with newly-installed windows, check chapter entitled "Expiry date" before using the adhesive.

Wiper Blade Element Cleaning

Lift each blade assembly off of the windshield and clean the element with a cloth saturated with full strength washer solvent. Then rinse the blade assemblies with clear water.

Wiper Chatter Repair

Some vehicles may exhibit a condition where the windshield wipers chatter and/or wipe unevenly. Several items may contribute to this condition. To completely repair this condition, ALL of the items listed should be tested and repaired as necessary.

  1. Clean the windshield glass. Refer to «Windshield Glass Cleaning»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
  2. Clean the wiper blade elements. Refer to «Wiper Blade Element Cleaning»(/buick/regal/v-2009-2013/remont/wiperwasher-systems/#wiper-system-and-washer-system__wiper-blade-element-cleaning) .
  3. Inspect the wiper blade element set.

Wiper/Washer System Components

The wiper/washer system consists of the following electrical components

  1. Windshield Wiper Relay
  2. Windshield Wiper Speed Control Relay
  3. Windshield Washer Pump Relay
  4. Windshield Washer Fluid Pump
  5. Windshield Wiper Motor
  6. Window Wiper/Washer Switch
  7. Windshield Wiper Motor Fuse
  8. Windshield Washer Fluid Pump Fuse
  9. Body Control Module (BCM)
  10. Windshield Washer Fluid Level Switch

Windshield Wiper System

The body control module (BCM) determines the front wipe/wash system mode of operation by monitoring several signals from the front wipe/wash switch as indicated in the wiper switch

The front wipe/wash switch receives a reference ground signal from the BCM. Each input of the BCM provides a switched battery pull-up for each front wiper/washer switch output signal it receives. All the BCM inputs are recognized as active when the wiper switch provides a path to the referenced ground signal. The first signal received by the BCM is the result of 6 resistors in the front wiper switch configured as a resistor ladder network. This signal is connected to a BCM analog to digital input. Depending on the function selected (High, Low, Intermittent 1 thru 5, Mist, Off), the front wiper control switch connects a different set of resistors into the circuit resulting in different voltages appearing on the BCM A/D input. By monitoring this voltage, the BCM determines how to control the wiper motor On/Off Relay. It should be noted that High, Low, and Mist all have the same value on this signal circuit. The second signal received from the front wiper switch is active only when the front wiper switch is in the high speed wiper position. When the wiper switch is not in the high speed position, the switch is open and the signal circuit is pulled to battery by the BCM. When the wiper switch is in the high speed position, the switch pulls the circuit low. The BCM determines how to control the Wiper high/low speed relay from this input. The third signal received from the front wiper switch is from the momentary windshield wash control switch. When the washer switch is not active the switch is open and the signal circuit is pulled to battery by the BCM. When the washer switch is active, the switch pulls the circuit low. The BCM controls the windshield wash and windshield wash activated wiper operation based on this input.

The BCM controls front wiper motor operation through two output signals and the monitoring of one input signal. The two outputs (one high side drive, one low side drive) are used to control two external wiper motor relays: front wiper motor on/off relay: which provides the wiper motor with battery power when it is activated by the high side drive signal (switched battery) from the BCM. When left deactivated, the normally closed contacts provide a ground to the wiper motor. Wiper high/low speed relay: when activated by a low side drive signal (ground) from the BCM, it switches the power supplied by the wiper motor's on/off relay to the motors high speed input. When left deactivated, the normally closed contacts connect the power supplied by the wiper motor's on/off relay to the motor's low speed input. The input used by the BCM is from the park switch located in the wiper motor assembly. When the wiper blades are not in the park position, the wiper park switch is open and the circuit is pulled up to battery by the BCM. When the wiper blades are in the park position at the bottom of the glass, the wiper park switch closes to ground pulling the park signal circuit low.

To initiate low speed operation, the BCM only energizes the front wiper motor on/off relay. This allows battery voltage from the wiper fuse to be applied through the switched contacts of the wiper motor on/off relay, through the normally closed contacts of the wiper high/low speed relay, to the low speed control circuit of the windshield wiper motor.

Redundant high speed switch pass through. The BCM provides redundant circuitry which places battery power on its wiper motor on/off relay output with activation of its low assertion high speed wiper switch input. The BCM shall be capable of doing this, even if the module has lost all microprocessor control. This redundant circuit shall supply power while in the RUN and CRANK power modes. however; while in the CRANK power mode, the pass through shall only be active if the BCM is NOT in a computer operating properly state.

To initiate high speed operation, the BCM energizes both the front wiper motor on/off relay and the wiper high/low speed relay. This allows battery voltage from the wiper fuse to be applied through the switched contacts of the wiper motor on/off relay, through the switched contacts of the wiper high/low speed relay, to the high speed control circuit of the windshield wiper motor.

Parking the wiper motor. In order to perform an accurate read of the park switch and to ensure the wipers will come to rest while still in the park position, parking of the wipers only occurs while in a low speed wiper mode. This requires that if the wipers are performing a high speed wiper operation at the time they are required to park, the BCM shall transition the Wipers to low speed by deactivating the wiper high/low relay before attempting to park. In order to park the wipers, the BCM monitors the park circuit until the park switch pulls the park circuit to ground. At this time, the BCM will immediately deactivate the wiper motor on/off relay. The relay contacts will switch back to their normally closed position and will apply ground to the wiper motor power inputs through the normally closed contacts of the wiper high/low relay. This deactivates and dynamically brakes the wiper motor in the park position. When the wiper switch is turned to the OFF position while the wiper motor is somewhere in mid-cycle, the BCM will continue to operate the motor until the wipers reach the park position. If the BCM is running the wiper motor and does not see a state transition of the park switch after 8 s, the wipers will stop immediately when the wiper switch is turned to OFF. If the ignition is turned OFF while the wipers are in mid-cycle, the wipers will stop immediately, regardless of position. The BCM will park the wipers next time the ignition is turned ON.

The windshield wiper system MIST operation is identical to LOW speed operation, except that the MIST switch is a press and release type switch. When the wiper switch is moved to the MIST position and released, low speed wiper motor operation is started and will continue until 1 cycle is complete. If the wiper switch is moved to the MIST position and held, the wiper motor will operate in the LOW speed mode until the switch is released.

Windshield wiper intermittent operation is a low speed wiper motor function with a variable delay interval between the wiper motor cycles. The duration of the delay is controlled by the front wiper control switch's intermittent 1 thru intermittent 5 settings. The wiper operation is as follows

  1. The BCM will initiate a single wipe by activating its front wiper ON/OFF relay output.
  2. At the completion of a single wipe, the BCM will park the wipers as described above.
  3. The BCM will then pause the wipers in their park position for the time duration associated with intermittent delay switch setting.
  4. When the delay time expires repeat Steps 1 and 3 until the system is turned off or taken out of intermittent mode. If the wiper switch is moved from a longer delay interval to a shorter delay interval, the BCM will command an immediate wipe cycle and reset the delay timer to the shorter delay interval.

Intermittent wiper operation may be vehicle speed sensitive. When enabled, the speed compensated intermittent feature causes the intermittent wiper delay intervals to become shorter as a function of increased speed. As vehicle speed is reduced the intervals will become closer to the predetermined

Windshield Washer System

The BCM controls the windshield wash operation and windshield wash activated wiper operation. When the BCM detects the activation of the momentary windshield wash control switch, it activates its washer pump relay drive output which supplies battery power to the coil of the washer pump relay. This energizes the relay, which switches battery power to the pump motor. The BCM will also activate continuous low speed windshield wipes as described above. Upon deactivation of the windshield wash control switch, the wiper control module (BCM) shall deactivate the wash motor and will also park the wiper motor as described above unless the drip wipe feature is enabled. On some vehicles the drip wipe feature will be enabled and cause the system to provide additional wiping of the windshield after the switch has been released and fluid is no longer being applied. The front wash feature may attempt to detect a stuck switch. When enabled, activation of the wash feature shall be limited to 10 seconds.

Illustration Tool Number/ Description J 39232 Wiper Linkage Separator J 39529 Wiper Linkage Installer J 39822 Wiper Arm Puller

Scheme 17

Scheme 17: Special Tools
Scheme 17: Special Tools