Wiper System and Washer System Cadillac ATS I

Fastener Tightening Specifications

Fastener Tightening Specifications

Scheme 1

Scheme 2

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit/System Description

B+ voltage is supplied to the Rain Sensor. Whenever the ignition is ON, or accessory positions, the body control module (BCM), sends the turn signal/multifunction switch status by using a pulse width modulated (PWM) signal. When a wipe cycle is needed, the Rain Sensor sends a PWM voltage signal to the BCM, requesting the wiper operation. The BCM commands the Windshield Wiper Motor wipe cycles. If at anytime a fault occurs between the Rain Sensor and BCM, the BCM will use the inputs from the turn signal/multifunction switch in the delay positions to operate the Windshield Wiper Motor at continuous variable delay intervals.

Conditions for Running the DTC

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

Conditions for Setting the DTC

The system voltage is between 9-16 V.

Action Taken When the DTC Sets

1. If the BCM loses communication with the Rain Sensor while the Rain Sensor is requesting single wipes, it shall fail soft the wipers operation to front wiper manual - intermittent with a fixed dwell time of 4 seconds.
2. If the BCM loses communication with the Rain Sensor while the Rain Sensor is continuously requesting low, it shall fail soft the wipers operation to front wiper manual - low.
3. If the BCM loses communication with the Rain Sensor while the Rain Sensor is continuously requesting high, it shall fail soft the wipers operation to front wiper manual - high.

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes.

Reference Information

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#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.
2. Verify DTC U151A is not set. If DTC U151A is set Please Refer to «DTC U1500-U15FF»(/cadillac/ats/i-2012-2014/remont/communication-devices/#data-communication-system) If DTC U151A is not set
3. Verify the wipers operate at low speed when the Windshield Wiper Switch is in the LOW position. If the wipers are not operating at low speed Refer to «Windshield Wiper System Malfunction»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) . If the wipers are operating at low speed
4. Place the Windshield Wiper Switch in the delay mode/moisture sensitivity settings Delay 1 through Delay 5 and spray the outside of the windshield in the rear view mirror/rain sensor region with a water bottle.
5. Verify the wipers operate at low speed. If the wipers are not operating at low speed Test or replace the B117 Rain Sensor. If the wipers are operating at low speed
6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

1. «Windshield Outside Moisture/Ambient Light and Humidity Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

DTC Descriptors

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

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 low reference 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.

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.

1. A short to ground is detected in the Front Wiper Relay control circuit or in the High Speed Relay control circuit.
2. A short to voltage or an open/high resistance is detected in the Front Wiper Relay control circuit or in the High Speed Relay control circuit.

The BCM will not activate the wiper output.

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.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool Windshield Wiper High Speed Switch parameter changes between Active and Inactive when activating the high speed windshield wipers. If the parameter does not change Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction. If the parameter changes
3. Verify the scan tool Windshield Wiper Switch parameter changes between Off and Low when activating the low speed windshield wipers. If the parameter does not change Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction. If the parameter changes
4. Verify the scan tool Windshield Wiper Switch parameter changes between Delay 1 and Delay 5 when cycling the intermittent speed windshield wipers. If the parameter does not change Test or replace the S82 Windsheild Wiper/Washer Switch. If the parameter changes
5. Verify the M75 Windshield Wiper Motor changes between Off, Low, and High when cycling the S82 Windshield Wiper/Washer Switch between Off, Low, and High. If the Windshield Wiper Motor does not cycle between Off, Low, and High Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction If the Windshield Wiper Motor cycles between Off, Low, and High
6. Ignition OFF.
7. Verify the scan tool Windshield Wiper Park Switch parameter is Active. If the parameter does not change Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction. If the parameter changes
8. All OK.

Circuit/System Testing

Windshield Wiper/Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Windshield Wiper High Speed Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
6. Verify the scan tool Windshield Wiper High Speed Switch parameter is Active. If not Active Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
7. Test for greater than 8 V between the signal circuit terminal 3 and ground. If less than 8 V Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If 8 V or greater
8. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
9. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 3 and ground. If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
10. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Wiper Motor Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M75 Windshield Wiper Motor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Windshield Wiper Park Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 5.
6. Verify the scan tool Windshield Wiper Park Switch parameter is Active. If not Active Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
7. Ignition OFF and all vehicle systems OFF, disconnect the KR12B Windshield Wiper Relay. It may take up to 2 min for all vehicle systems to power down.
8. Test for less than 10 ohms between each of the ground circuit terminal 1 and ground: If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
9. Ignition ON.
10. Verify a test lamp illuminates between the B+ circuit terminal 5 and the ground circuit terminal 1. If the test lamp does not illuminate and the circuit fuse is good Replace the X50A Fuse Block - Underhood. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp. Disconnect the KR12C Windshield Wiper Speed Control Relay. Test for infinite resistance between each of the control circuits listed below and ground: Terminal 4 Terminal 5 If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M75 Windshield Wiper Motor If the test lamp illuminates
11. Connect a test lamp between the control circuit terminal 2 and the ground circuit terminal 1.
12. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper Motor Relay Low and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
13. Ignition OFF, connect the KR12B Windshield Wiper Relay and disconnect the KR12C Windshield Wiper Speed Control Relay, ignition ON.
14. Test for less than 10 ohms between the control circuit terminal 3 and ground. If 10 ohms or greater Test or replace the KR12B Windshield Wiper Relay. If less than 10 ohms
15. Connect a test lamp between the control circuit terminal 3 and ground.
16. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper Motor Relay Low and Off with a scan tool. If the test lamp does not turn ON and OFF Test or replace the KR12B Windshield Wiper Relay. If the test lamp turns ON and OFF
17. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground. If the test lamp does not illuminate Replace the X50A Fuse Block - Underhood. If the test lamp illuminates
18. Connect a test lamp between the B+ circuit terminal 2 and the control circuit terminal 1.
19. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper High Speed Relay High and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp turns ON and OFF
20. Ignition OFF, connect the KR12C Windshield Wiper Speed Control Relay.
21. Connect a test lamp between the M75 Windshield Wiper Motor control circuit terminal 1 and ground circuit terminal 5, ignition ON.
22. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper Motor Relay Low and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the KR12C Windshield Wiper Speed Control Relay. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the KR12C Windshield Wiper Speed Control Relay. If the test lamp turns ON and OFF
23. Connect a test lamp between the M75 Windshield Wiper Motor control circuit terminal 4 and ground circuit terminal 5, ignition ON.
24. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper High Speed Relay High and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the KR12C Windshield Wiper Speed Control Relay. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the KR12C Windshield Wiper Speed Control Relay. If the test lamp turns ON and OFF
25. Test or replace the M75 Windshield Wiper Motor.

Component Testing

Windshield Wiper/Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 1 and the low reference terminal 2 with the high speed switch in the open position. If less than infinite resistance Replace the S82 Windshield Wiper/Washer Switch. If infinite resistance
3. Test for less than 2 ohms between the signal circuit terminal 1 and the low reference circuit terminal 2 with the high speed switch in the closed position. If 2 ohms or greater Replace the S82 Windshield Wiper/Washer Switch. If less than 2 ohms
4. Test for infinite resistance between the signal terminal 3 and the low reference terminal 2 with the low speed switch in the open position. If less than infinite resistance Replace the S82 Windshield Wiper/Washer Switch. If infinite resistance
5. Verify the resistance readings are within the specified range listed below between the signal circuit terminal 3 and the low reference circuit terminal 1 by pushing the switch in the listed positions below. Delay 1 : 3.75-3.85kohms Delay 2 : 2.75-2.85kohms Delay 3 : 1.95-2.05kohms Delay 4 : 1.25-1.35kohms Delay 5 : 765-775ohms If not within the specified range Replace the S82 Windshield Wiper/Washer Switch. If within the specified range
6. All OK

Relay Test

1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60-200 ohms between terminals 1 and 2. If less than 60 or greater than 200 Replace the relay. If between 60-200 ohms
3. Test for infinite resistance between the terminals listed below: 3 and 2 3 and 5 3 and 1 1 and 4 If less than infinite resistance Replace the relay. If infinite resistance
4. Test for less than 5 ohms between terminals 3 and 4. If 5 ohms or greater Replace the relay. If less than 5 ohms
5. Install a 10 A fused jumper wire between relay terminal 2 and 12 V. Install a jumper wire between relay terminal 1 and ground.
6. Test for less than 5 ohms between terminals 3 and 5. If 5 ohms or greater Replace the relay. If less than 5 ohms
7. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Windshield Wiper Motor Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
2. «Relay Replacement (Within an Electrical Center)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
3. «Windshield Wiper and Washer Switch Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
4. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The headlamp washer pump is controlled by the body control module (BCM) via a removable relay. If the headlamp lights are on, the BCM will activate the headlamp washer pump the first time, and the windshield washer pump is activated. After the initial headlamp washer activation, the BCM will only allow headlamp washer function every 5 windshield washer cycles. When the headlamp washer function is requested by the BCM's internal logic, it applies voltage through a control circuit to the headlamp washer pump relay. With the relay energized, fused battery voltage is applied through the switch contacts of the relay and the control circuit to activate the headlamp washer fluid pump.

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

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

Washer operation is suspended.

1. A current DTC clears when the diagnostic runs and passes.
2. A history DTC will clear after 50 consecutive ignition cycles without a fault present.

Diagnostic Aids

The headlamp wash feature shall only be allowed to be activated, if the low or high beam headlamps are active as well.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the headlamps washers turn ON and OFF when commanding the Headlamp Washer Relay Command On and Off with a scan tool. If the headlamp washers do not turn ON and OFF Refer to Circuit/System Testing If the headlamp washers turn ON and OFF
3. All OK.

1. Ignition OFF and all vehicle systems OFF, disconnect the KR2 Headlamp Washer Pump Relay. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 85 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate
5. Replace the X50 Fuse Block-Underhood. If the test lamp illuminates
6. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
7. Verify the test lamp turns ON and OFF when commanding the Headlamp Washer Relay Command On and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the X5 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
8. Verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates Repair the short to voltage on the control circuit If the test lamp does not illuminate
9. Ignition OFF and all vehicle systems OFF, remove the test lamp, disconnect the harness connector at the G16 Headlamp Washer Pump. It may take up to 2 min for all vehicle systems to power down.
10. Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
11. Connect the harness connector at the G16 Headlamp Washer Pump.
12. Ignition ON, connect a 3 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
13. Verify the G16 Headlamp Washer Pump is activated. If the G16 Headlamp Washer Pump does not activate Ignition OFF, remove the jumper wire, disconnect the harness connector at the G16 Headlamp Washer Pump. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the G16 Headlamp Washer Pump. If the G16 Headlamp Washer Pump activates
14. Test or replace the KR2 Headlamp Washer Pump Relay.

Relay Test

1. Ignition OFF, disconnect the KR2 Headlamp Washer Pump Relay.
2. Test for 60-200 ohms between terminals 85 and 86. If less than 60 or greater than 200 Replace the KR2 Headlamp Washer Pump Relay. If between 60-200 ohms
3. Test for infinite resistance between the terminals listed below: 30 and 86 30 and 87 30 and 85 85 and 87 If less than infinite resistance Replace the KR2 Headlamp Washer Pump Relay. If infinite resistance
4. Install a 10 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.
5. Test for less than 10 ohms between terminals 30 and 87. If 10 ohms or greater Replace the KR2 Headlamp Washer Pump Relay. If less than 10 ohms
6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Relay Replacement (Within an Electrical Center)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Headlamp Washer Pump Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
3. «Front Compartment Fuse Block Housing Replacement»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
4. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for body control module replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Body Control Module (BCM) controls the windshield washer fluid pump based on an input from the Windshield Wiper/Washer Switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the washer 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.

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

1. A short to ground or an open/high resistance is detected in the windshield washer relay control circuit.
2. A short to voltage 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

Wiper/Washer Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool Windshield Washer Switch parameter changes between Active and Inactive when pressing the Windshield Washer Switch. If the parameter does not change Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction. If the parameter changes
3. Verify the scan tool Instrument Cluster Washer Fluid Level Switch parameter changes between Closed when the fluid level is full and Open when the fluid level is low. If the parameter does not change Refer to Circuit/System Testing - Windshield Washer Fluid Level Switch Malfunction. If the parameter changes
4. Verify the Windshield Washers turn On when commanding the Windshield Washer Relay Active with a scan tool. If the Windshield Washers do not turn ON Refer to Circuit/System Testing - Windshield Washer Pump Malfunction If the Windshield Washers turn ON
5. All OK.

Windshield Wiper/Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Windshield Washer Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 2.
6. Verify the scan tool Windshield Washer Switch parameter is Active. If not Active Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
7. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Washer Fluid Level Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B118B Windshield Washer Fluid Level Switch. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Washer Fluid Level Switch parameter is Open. If not Open Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the P16 Instrument Cluster. If Open
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 2.
6. Verify the scan tool Washer Fluid Level Switch parameter is Closed. If not Closed Ignition OFF, remove the jumper wire, disconnect the harness connector at the P16 Instrument Cluster, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the P16 Instrument Cluster. If Closed
7. Test or replace the B118B Windshield Washer Fluid Level Switch.

Windshield Washer Pump Malfunction

1. Ignition OFF, and all vehicle systems OFF. Disconnect the harness connector at the G24 Windshield Washer Pump. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground. If 10 ohms or greater Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 2, ignition ON.
4. Verify the test lamp does NOT turn ON and OFF when commanding the Windshield Washer Relay Active and Inactive with a scan tool. If the test lamp turns ON and OFF Test or replace the G24 Windshield Washer Pump. If the test lamp does not turn ON and OFF
5. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump. Disconnect the X1 harness connector at the X50A Fuse Block - Underhood, It may take up to 2 min for all vehicle systems to power down.
6. Test for less than 10 ohms between the ground circuit terminal 71 and ground. If 10 ohms or greater Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
7. Ignition ON.
8. Verify the G24 Windshield Washer Pump is not activated. If the G24 Windshield Washer Pump is activated Ignition OFF, disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON. Test for less than 1 V between the control circuit terminal 1 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the G24 Windshield Washer Pump. If the G24 Windshield Washer Pump is not activated
9. Connect a 20 A fused jumper wire between the control circuit terminal 4 and B+.
10. Verify the G24 Windshield Washer Pump activates. If the G24 Windshield Washer Pump does not activate Ignition OFF, remove the jumper wire, disconnect the harness connector at the G24 Windshield Washer Pump. Test for infinite resistance between the control circuit and ground. If less than Infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the G24 Windshield Washer Pump. If the G24 Windshield Washer Pump activates
11. Ignition OFF, connect the X1 harness connector at the X50A Fuse Block - Underhood. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
12. Verify the G24 Windshield Washer Pump is not activated. If the G24 Windshield Washer Pump is activated Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the X50A Fuse Block - Underhood. If the G24 Windshield Washer Pump is not activated
13. Connect a 10 A fused jumper wire between the control circuit terminal 14 and B+.
14. Verify the G24 Windshield Washer Pump activates. If the G24 Windshield Washer Pump does not activate Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If less than infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the X50A Fuse Block - Underhood. If the G24 Windshield Washer Pump activates
15. Replace the K9 Body Control Module.

Windshield Wiper/Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 5 and the low reference terminal 2 with the switch in the open position. If less than infinite resistance Replace the S82 Windshield Wiper/Washer Switch. If infinite resistance
3. Test for less than 2 ohms between the signal circuit terminal 5 and the low reference circuit terminal 2 with the switch in the closed position. If 2 ohms or greater Replace the S82 Windshield Wiper/Washer Switch. If less than 2 ohms
4. All OK

Windshield Washer Fluid Level Switch

1. Ignition OFF, disconnect the harness connector at the B118B Windshield Washer Fluid Level Switch.
2. Test for infinite resistance between the signal circuit terminal 1 and the ground circuit terminal 2 with the switch in the open position. If less than infinite resistance Replace the B118B Windshield Washer Fluid Level Switch. If infinite resistance
3. Test for less than 2 ohms between the signal circuit terminal 1 and the ground circuit terminal 2 with the switch in the closed position. If 2 ohms or greater Replace the B118B Windshield Washer Fluid Level Switch. If less than 2 ohms
4. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Front Compartment Fuse Block Housing Replacement»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Windshield Washer Pump Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
3. «Windshield Washer Solvent Level Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
4. «Windshield Wiper and Washer Switch Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
5. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM and Instrument Cluster replacement and 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»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/remont/body-electrical/#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»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
2. «Washer Malfunction»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
3. «Rain Sensor Malfunction»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
4. «Headlamp Washer Malfunction»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

For symptom byte information, refer to Symptom Byte List .

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 low reference 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.

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.

1. A short to ground is detected in the Front Wiper Relay control circuit or in the High Speed Relay control circuit.
2. A short to voltage or an open/high resistance is detected in the Front Wiper Relay control circuit or in the High Speed Relay control circuit.

The BCM will not activate the wiper output.

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.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool Windshield Wiper High Speed Switch parameter changes between Active and Inactive when activating the high speed windshield wipers. If the parameter does not change Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction. If the parameter changes
3. Verify the scan tool Windshield Wiper Switch parameter changes between Off and Low when activating the low speed windshield wipers. If the parameter does not change Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction. If the parameter changes
4. Verify the scan tool Windshield Wiper Switch parameter changes between Delay 1 and Delay 5 when cycling the intermittent speed windshield wipers. If the parameter does not change Test or replace the S82 Windsheild Wiper/Washer Switch. If the parameter changes
5. Verify the M75 Windshield Wiper Motor changes between Off, Low, and High when cycling the S82 Windshield Wiper/Washer Switch between Off, Low, and High. If the Windshield Wiper Motor does not cycle between Off, Low, and High Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction If the Windshield Wiper Motor cycles between Off, Low, and High
6. Ignition OFF.
7. Verify the scan tool Windshield Wiper Park Switch parameter is Active. If the parameter does not change Refer to Circuit/System Testing - Windshield Wiper Motor Malfunction. If the parameter changes
8. All OK.

Windshield Wiper/Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Windshield Wiper High Speed Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
6. Verify the scan tool Windshield Wiper High Speed Switch parameter is Active. If not Active Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
7. Test for greater than 8 V between the signal circuit terminal 3 and ground. If less than 8 V Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit and ground If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If 8 V or greater
8. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
9. Test for less than 1 V between the S82 Windshield Wiper/Washer Switch signal circuit terminal 3 and ground. If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
10. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Wiper Motor Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M75 Windshield Wiper Motor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Windshield Wiper Park Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 5.
6. Verify the scan tool Windshield Wiper Park Switch parameter is Active. If not Active Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
7. Ignition OFF and all vehicle systems OFF, disconnect the KR12B Windshield Wiper Relay. It may take up to 2 min for all vehicle systems to power down.
8. Test for less than 10 ohms between each of the ground circuit terminal 1 and ground: If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
9. Ignition ON.
10. Verify a test lamp illuminates between the B+ circuit terminal 5 and the ground circuit terminal 1. If the test lamp does not illuminate and the circuit fuse is good Replace the X50A Fuse Block - Underhood. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp. Disconnect the KR12C Windshield Wiper Speed Control Relay. Test for infinite resistance between each of the control circuits listed below and ground: Terminal 4 Terminal 5 If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M75 Windshield Wiper Motor If the test lamp illuminates
11. Connect a test lamp between the control circuit terminal 2 and the ground circuit terminal 1.
12. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper Motor Relay Low and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
13. Ignition OFF, connect the KR12B Windshield Wiper Relay and disconnect the KR12C Windshield Wiper Speed Control Relay, ignition ON.
14. Test for less than 10 ohms between the control circuit terminal 3 and ground. If 10 ohms or greater Test or replace the KR12B Windshield Wiper Relay. If less than 10 ohms
15. Connect a test lamp between the control circuit terminal 3 and ground.
16. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper Motor Relay Low and Off with a scan tool. If the test lamp does not turn ON and OFF Test or replace the KR12B Windshield Wiper Relay. If the test lamp turns ON and OFF
17. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground. If the test lamp does not illuminate Replace the X50A Fuse Block - Underhood. If the test lamp illuminates
18. Connect a test lamp between the B+ circuit terminal 2 and the control circuit terminal 1.
19. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper High Speed Relay High and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If the test lamp turns ON and OFF
20. Ignition OFF, connect the KR12C Windshield Wiper Speed Control Relay.
21. Connect a test lamp between the M75 Windshield Wiper Motor control circuit terminal 1 and ground circuit terminal 5, ignition ON.
22. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper Motor Relay Low and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the KR12C Windshield Wiper Speed Control Relay. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the KR12C Windshield Wiper Speed Control Relay. If the test lamp turns ON and OFF
23. Connect a test lamp between the M75 Windshield Wiper Motor control circuit terminal 4 and ground circuit terminal 5, ignition ON.
24. Verify the test lamp turns ON and OFF when commanding the Windshield Wiper High Speed Relay High and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the KR12C Windshield Wiper Speed Control Relay. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the KR12C Windshield Wiper Speed Control Relay, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, test or replace the KR12C Windshield Wiper Speed Control Relay. If the test lamp turns ON and OFF
25. Test or replace the M75 Windshield Wiper Motor.

Windshield Wiper/Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 1 and the low reference terminal 2 with the high speed switch in the open position. If less than infinite resistance Replace the S82 Windshield Wiper/Washer Switch. If infinite resistance
3. Test for less than 2 ohms between the signal circuit terminal 1 and the low reference circuit terminal 2 with the high speed switch in the closed position. If 2 ohms or greater Replace the S82 Windshield Wiper/Washer Switch. If less than 2 ohms
4. Test for infinite resistance between the signal terminal 3 and the low reference terminal 2 with the low speed switch in the open position. If less than infinite resistance Replace the S82 Windshield Wiper/Washer Switch. If infinite resistance
5. Verify the resistance readings are within the specified range listed below between the signal circuit terminal 3 and the low reference circuit terminal 1 by pushing the switch in the listed positions below. Delay 1 : 3.75-3.85kohms Delay 2 : 2.75-2.85kohms Delay 3 : 1.95-2.05kohms Delay 4 : 1.25-1.35kohms Delay 5 : 765-775ohms If not within the specified range Replace the S82 Windshield Wiper/Washer Switch. If within the specified range
6. All OK

Relay Test

1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60-200 ohms between terminals 1 and 2. If less than 60 or greater than 200 Replace the relay. If between 60-200 ohms
3. Test for infinite resistance between the terminals listed below: 3 and 2 3 and 5 3 and 1 1 and 4 If less than infinite resistance Replace the relay. If infinite resistance
4. Test for less than 5 ohms between terminals 3 and 4. If 5 ohms or greater Replace the relay. If less than 5 ohms
5. Install a 10 A fused jumper wire between relay terminal 2 and 12 V. Install a jumper wire between relay terminal 1 and ground.
6. Test for less than 5 ohms between terminals 3 and 5. If 5 ohms or greater Replace the relay. If less than 5 ohms
7. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Windshield Wiper Motor Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
2. «Relay Replacement (Within an Electrical Center)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
3. «Windshield Wiper and Washer Switch Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
4. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Body Control Module (BCM) controls the windshield washer fluid pump based on an input from the Windshield Wiper/Washer Switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the washer 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.

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

1. A short to ground or an open/high resistance is detected in the windshield washer relay control circuit.
2. A short to voltage 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

Wiper/Washer Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool Windshield Washer Switch parameter changes between Active and Inactive when pressing the Windshield Washer Switch. If the parameter does not change Refer to Circuit/System Testing - Windshield Wiper/Washer Switch Malfunction. If the parameter changes
3. Verify the scan tool Instrument Cluster Washer Fluid Level Switch parameter changes between Closed when the fluid level is full and Open when the fluid level is low. If the parameter does not change Refer to Circuit/System Testing - Windshield Washer Fluid Level Switch Malfunction. If the parameter changes
4. Verify the Windshield Washers turn On when commanding the Windshield Washer Relay Active with a scan tool. If the Windshield Washers do not turn ON Refer to Circuit/System Testing - Windshield Washer Pump Malfunction If the Windshield Washers turn ON
5. All OK.

Windshield Wiper/Washer Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch. It may take up to 11 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Windshield Washer Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the signal circuit terminal 5 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K9 Body Control Module. If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 2.
6. Verify the scan tool Windshield Washer Switch parameter is Active. If not Active Ignition OFF, remove the jumper wire, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If Active
7. Test or replace the S82 Windshield Wiper/Washer Switch.

Windshield Washer Fluid Level Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B118B Windshield Washer Fluid Level Switch. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Washer Fluid Level Switch parameter is Open. If not Open Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the P16 Instrument Cluster. If Open
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 2.
6. Verify the scan tool Washer Fluid Level Switch parameter is Closed. If not Closed Ignition OFF, remove the jumper wire, disconnect the harness connector at the P16 Instrument Cluster, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the P16 Instrument Cluster. If Closed
7. Test or replace the B118B Windshield Washer Fluid Level Switch.

Windshield Washer Pump Malfunction

1. Ignition OFF, and all vehicle systems OFF. Disconnect the harness connector at the G24 Windshield Washer Pump. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground. If 10 ohms or greater Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 2, ignition ON.
4. Verify the test lamp does NOT turn ON and OFF when commanding the Windshield Washer Relay Active and Inactive with a scan tool. If the test lamp turns ON and OFF Test or replace the G24 Windshield Washer Pump. If the test lamp does not turn ON and OFF
5. Ignition OFF, connect the harness connector at the G24 Windshield Washer Pump. Disconnect the X1 harness connector at the X50A Fuse Block - Underhood, It may take up to 2 min for all vehicle systems to power down.
6. Test for less than 10 ohms between the ground circuit terminal 71 and ground. If 10 ohms or greater Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
7. Ignition ON.
8. Verify the G24 Windshield Washer Pump is not activated. If the G24 Windshield Washer Pump is activated Ignition OFF, disconnect the harness connector at the G24 Windshield Washer Pump, ignition ON. Test for less than 1 V between the control circuit terminal 1 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the G24 Windshield Washer Pump. If the G24 Windshield Washer Pump is not activated
9. Connect a 20 A fused jumper wire between the control circuit terminal 4 and B+.
10. Verify the G24 Windshield Washer Pump activates. If the G24 Windshield Washer Pump does not activate Ignition OFF, remove the jumper wire, disconnect the harness connector at the G24 Windshield Washer Pump. Test for infinite resistance between the control circuit and ground. If less than Infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the G24 Windshield Washer Pump. If the G24 Windshield Washer Pump activates
11. Ignition OFF, connect the X1 harness connector at the X50A Fuse Block - Underhood. Disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
12. Verify the G24 Windshield Washer Pump is not activated. If the G24 Windshield Washer Pump is activated Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block - Underhood, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the X50A Fuse Block - Underhood. If the G24 Windshield Washer Pump is not activated
13. Connect a 10 A fused jumper wire between the control circuit terminal 14 and B+.
14. Verify the G24 Windshield Washer Pump activates. If the G24 Windshield Washer Pump does not activate Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block - Underhood. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If less than infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the X50A Fuse Block - Underhood. If the G24 Windshield Washer Pump activates
15. Replace the K9 Body Control Module.

Windshield Wiper/Washer Switch

1. Ignition OFF, disconnect the harness connector at the S82 Windshield Wiper/Washer Switch.
2. Test for infinite resistance between the signal terminal 5 and the low reference terminal 2 with the switch in the open position. If less than infinite resistance Replace the S82 Windshield Wiper/Washer Switch. If infinite resistance
3. Test for less than 2 ohms between the signal circuit terminal 5 and the low reference circuit terminal 2 with the switch in the closed position. If 2 ohms or greater Replace the S82 Windshield Wiper/Washer Switch. If less than 2 ohms
4. All OK

Windshield Washer Fluid Level Switch

1. Ignition OFF, disconnect the harness connector at the B118B Windshield Washer Fluid Level Switch.
2. Test for infinite resistance between the signal circuit terminal 1 and the ground circuit terminal 2 with the switch in the open position. If less than infinite resistance Replace the B118B Windshield Washer Fluid Level Switch. If infinite resistance
3. Test for less than 2 ohms between the signal circuit terminal 1 and the ground circuit terminal 2 with the switch in the closed position. If 2 ohms or greater Replace the B118B Windshield Washer Fluid Level Switch. If less than 2 ohms
4. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Front Compartment Fuse Block Housing Replacement»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Windshield Washer Pump Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
3. «Windshield Washer Solvent Level Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
4. «Windshield Wiper and Washer Switch Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
5. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM and Instrument Cluster replacement and programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

B+ voltage is supplied to the Rain Sensor. Whenever the ignition is ON, or accessory positions, the body control module (BCM), sends the turn signal/multifunction switch status by using data communication. When a wipe cycle is needed, the Rain Sensor sends a data communication message to the BCM, requesting the wiper operation. The BCM commands the Windshield Wiper Motor wipe cycles. If at anytime a fault occurs between the Rain Sensor and BCM, the BCM will use the inputs from the turn signal/multifunction switch in the delay positions to operate the Windshield Wiper Motor at continuous variable delay intervals.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify DTC B370A is not set. If DTC B370A is set Please Refer to «DTC B370A»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) If DTC B370A is not set
3. Verify DTC U151A is not set. If DTC U151A is set Please Refer to «DTC U1500-U15FF»(/cadillac/ats/i-2012-2014/remont/communication-devices/#data-communication-system) If DTC U151A is not set
4. Verify the wipers operate at low speed when the Windshield Wiper Switch is in the LOW position. If the wipers are not operating at low speed Refer to «Windshield Wiper System Malfunction»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) . If the wipers are operating at low speed
5. Place the Windshield Wiper Switch in the delay mode/moisture sensitivity settings Delay 1 through Delay 5 and spray the outside of the windshield in the rear view mirror/rain sensor region with a water bottle.
6. Verify the wipers operate at low speed. If the wipers are not operating at low speed Refer to Circuit System Testing. If the wipers are operating at low speed
7. All OK.

1. Ignition OFF, all vehicle systems OFF, disconnect the harness connector at the B117 Rain Sensor. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 3 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the B117 Rain Sensor. If the test lamp illuminates
4. Ignition OFF, remove the test lamp, ignition ON.
5. Test for 4.0-12.0 V between the serial data circuit terminal 2 and ground. If less than 4.0 V Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the serial data circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the serial data circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If greater than 12.0 V Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the serial data circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If between 4.0-12.0 V
6. Test or replace the B117 Rain Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Windshield Outside Moisture/Ambient Light and Humidity Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/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»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The headlamp washer pump is controlled by the body control module (BCM) via a removable relay. If the headlamp lights are on, the BCM will activate the headlamp washer pump the first time, and the windshield washer pump is activated. After the initial headlamp washer activation, the BCM will only allow headlamp washer function every 5 windshield washer cycles. When the headlamp washer function is requested by the BCM's internal logic, it applies voltage through a control circuit to the headlamp washer pump relay. With the relay energized, fused battery voltage is applied through the switch contacts of the relay and the control circuit to activate the headlamp washer fluid pump.

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

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

Washer operation is suspended.

1. A current DTC clears when the diagnostic runs and passes.
2. A history DTC will clear after 50 consecutive ignition cycles without a fault present.

The headlamp wash feature shall only be allowed to be activated, if the low or high beam headlamps are active as well.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Wiper/Washer System Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the headlamps washers turn ON and OFF when commanding the Headlamp Washer Relay Command On and Off with a scan tool. If the headlamp washers do not turn ON and OFF Refer to Circuit/System Testing If the headlamp washers turn ON and OFF
3. All OK.

1. Ignition OFF and all vehicle systems OFF, disconnect the KR2 Headlamp Washer Pump Relay. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 85 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate
5. Replace the X50 Fuse Block-Underhood. If the test lamp illuminates
6. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
7. Verify the test lamp turns ON and OFF when commanding the Headlamp Washer Relay Command On and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the X5 harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the X5 harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If the test lamp turns ON and OFF
8. Verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates Repair the short to voltage on the control circuit If the test lamp does not illuminate
9. Ignition OFF and all vehicle systems OFF, remove the test lamp, disconnect the harness connector at the G16 Headlamp Washer Pump. It may take up to 2 min for all vehicle systems to power down.
10. Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
11. Connect the harness connector at the G16 Headlamp Washer Pump.
12. Ignition ON, connect a 3 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
13. Verify the G16 Headlamp Washer Pump is activated. If the G16 Headlamp Washer Pump does not activate Ignition OFF, remove the jumper wire, disconnect the harness connector at the G16 Headlamp Washer Pump. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, test or replace the G16 Headlamp Washer Pump. If the G16 Headlamp Washer Pump activates
14. Test or replace the KR2 Headlamp Washer Pump Relay.

Relay Test

1. Ignition OFF, disconnect the KR2 Headlamp Washer Pump Relay.
2. Test for 60-200 ohms between terminals 85 and 86. If less than 60 or greater than 200 Replace the KR2 Headlamp Washer Pump Relay. If between 60-200 ohms
3. Test for infinite resistance between the terminals listed below: 30 and 86 30 and 87 30 and 85 85 and 87 If less than infinite resistance Replace the KR2 Headlamp Washer Pump Relay. If infinite resistance
4. Install a 10 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.
5. Test for less than 10 ohms between terminals 30 and 87. If 10 ohms or greater Replace the KR2 Headlamp Washer Pump Relay. If less than 10 ohms
6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Relay Replacement (Within an Electrical Center)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Headlamp Washer Pump Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
3. «Front Compartment Fuse Block Housing Replacement»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
4. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for body control module replacement, programming and setup.

Scheme 3

Windshield Wiper and Washer Switch Replacement

Scheme 4

Windshield Washer Nozzle Hose Replacement

Scheme 5

Windshield Washer Nozzle Hose Connector Hose Replacement

Scheme 6

Windshield Washer Nozzle Replacement

Scheme 7

Headlamp Washer Nozzle Hole Cover Replacement

Scheme 8

Headlamp Washer Nozzle Bracket Replacement

Scheme 9

Headlamp Washer Nozzle Replacement

Scheme 10

Headlamp Washer Hose Replacement

Scheme 11

Headlamp Washer Pump Hose Replacement

Scheme 12

Windshield Washer Solvent Container Filler Tube Replacement (with CE1)

Scheme 13

Windshield Washer Solvent Container Filler Tube Replacement (with CE4)

Scheme 14

Windshield Washer Solvent Container Grommet Replacement

Scheme 15

Windshield Washer Solvent Container Replacement (with CE1)

Scheme 16

Windshield Washer Solvent Container Replacement (with CE4)

Scheme 17

Headlamp Washer Pump Replacement

Scheme 18

Windshield Washer Pump Replacement

Scheme 19

Windshield Washer Pump Wiring Harness Replacement (with CE1)

Scheme 20

Windshield Washer Pump Wiring Harness Replacement (with CE4)

Scheme 21

Windshield Washer Solvent Level Sensor Replacement

Scheme 22

Air Inlet Grille Panel Replacement

Scheme 23

Air Inlet Grille Panel Extension Replacement

Scheme 24

Air Inlet Grille Panel Air Deflector Replacement

Scheme 25

Windshield Wiper Arm Replacement

Scheme 26

Windshield Wiper Blade Replacement

Scheme 27

Windshield Wiper Motor Replacement

Scheme 28

Windshield Wiper Transmission Replacement

Scheme 29

Windshield Multifunction Sensor Mount Bracket Cover Replacement (With UEU, UFL)

Scheme 30

Windshield Multifunction Sensor Mount Bracket Cover Replacement (Without UEU, UFL)

Scheme 31

Windshield Multifunction Sensor Mount Bracket Lower Cover Replacement (With UEU, UFL)

Scheme 32

Windshield Multifunction Sensor Mount Bracket Lower Cover Replacement (Without UEU, UFL)

Scheme 33

Windshield Outside Moisture/Ambient Light and Humidity Sensor Replacement

Windshield Glass Cleaning

Clean the windshield with windshield cleaner, GM P/N 89021822 (Canadian P/N 992727) or equivalent. The cleaner should not harm the paint finish or scratch the glass. The glass is clean when the water no longer beads, but sheets across the entire glass surface.

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. Hold the blade in one hand and wipe the element with the saturated cloth until the black residue disappears. Then rinse the blade assembly elements with clean drinkable 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 inspected and corrected as necessary.

1. Inspect the wiper blade elements and replace as needed. Refer to «Windshield Wiper Blade Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
2. Clean the wiper blade elements. Refer to «Wiper Blade Element Cleaning»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system__wiper-blade-element-cleaning) .
3. Clean the windshield. Refer to «Windshield Glass Cleaning»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system__windshield-glass-cleaning) .

Scheme 34

Windshield Wiper Arm Adjustment

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 Outside Moisture Sensor
5. Windshield Washer Fluid Pump
6. Windshield Wiper Motor
7. Window Wiper/Washer Switch
8. Windshield Wiper Motor 30 A Fuse
9. Windshield Washer Fluid Pump 15 A Fuse
10. Body Control Module (BCM)
11. Headlamp Washer Fluid Pump Relay
12. Headlamp Washer Fluid Pump 25 A Fuse
13. Windshield Washer Fluid Level Switch
14. Rain Sensor

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

Scheme 35

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 s.

Scheme 36

Washer Fluid Level Indicator

The check washer fluid message is controlled by the instrument panel using an input from the washer fluid level switch. The washer fluid level signal circuit is supplied ignition voltage through a resistor then monitored within the instrument cluster. The washer fluid level switch is normally open so the instrument cluster detects ignition voltage on the washer fluid level signal circuit whenever the washer fluid level is not low. When the washer fluid reaches the point where the driver should be informed that the washer fluid is low, the washer fluid level switch closes. When the washer fluid level switch is closed the washer fluid level signal circuit voltage is pulled low, and the instrument panel displays the Check Washer Fluid message on the driver information center. In order to prevent the Check Washer Fluid message from being displayed while sloshing is occurring in the washer fluid container, the instrument cluster is programed with a 1 min delay before changing states of the Check Washer Fluid message during an ignition cycle.

Scheme 37

Headlamp Washer System

When Headlamp Wash Equipped, the headlamps shall be sprayed with wash fluid as a result of an extended Windshield Wash Switch Activation. In order to preserve wash fluid, the feature shall only be allowed to activate if the Low or High Beam Headlamps are active. In addition, after the initial Headlamp Wash operation has been performed, additional headlamp washes shall not be performed for the next 4 Windshield Wash activations or for 48 hours whichever comes first. In the event that the system has detected a Stuck Front Wash Switch condition, the Headlamp Wash Feature shall be disabled.

Scheme 38

Rain Sense Mode and Rain Sense Indicator

When this feature is activated on rain sense equipped vehicles, the wiper subsystem performs front windshield wipes according to the amount of moisture detected on the windshield. The BCM will control the wiper motor speed, as indicated above, based on wipe requests that it receives from a moisture sensor (rain sense module) which is mechanically attached to the windshield through a windshield mounted optic coupler. The system uses a master/slave configuration utilizing a local interconnect network (LIN) based serial data communication system. The BCM is designated as the master, while the rain sense module is designated the slave. As the system master, the BCM uses the LIN serial communication bus to enable or disable rain sense module operation, communicate wiper control switch settings, and wiper motor position information to the rain sense module. The rain sense module requests wiper motor function, and provides the BCM with system status and diagnostic information for diagnostic reporting. When this feature is present, the BCM uses the front wiper control switch's intermittent 1 thru intermittent 5 settings to activate the system and to act as the automatic wiper sensitivity control. This allows the driver to adjust the moisture level at which the rain Sensor requests the BCM to automatically wipe the windshield. The intermittent 1 setting corresponds to the lowest sensitivity and intermittent 5 the highest sensitivity.

Some vehicles (calibratable) shall display an AUTO front wiper indicator when the feature is active. This indicator shall notify the driver of the vehicle that the rain sensor is ready to perform automatic wiping of the windshield upon detection of moisture.

This indicator shall be requested when all of the following are true

1. Power mode is RUN.
2. If single steering column switch equipped: The front wiper switch is SENSITIVITY 1 through SENSITIVITY 5.
3. If dual steering column stalk equipped: The front wiper switch stalk angle is SENSITIVITY.

The above indicator shall be turned OFF when any of the following become true

1. Power mode becomes OFF, CRANK or ACCESSORY.
2. Front wiper switch is changed to OFF, MIST, LOW or HIGH.

Scheme 39

Special Tools

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

Scheme 40

Scheme 41

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• DTC U1500-U15FF
• Diagnostic Repair Verification
• Symptom Byte List
• Relay Replacement (Within an Electrical Center)
• Relay Replacement (Attached to Wire Harness)
• Checking Aftermarket Accessories
• Steering Column Lower Trim Cover Replacement
• Front Wheelhouse Liner Replacement
• Front Bumper Fascia Replacement
• Fastener Caution
• Inside Rearview Mirror Replacement
• DTC B370A
• Special Tools
• Wiper Blade Element Cleaning
• Windshield Glass Cleaning