Wiper System & Washer System Cadillac DTS I

Fastener Tightening Specifications

Scheme 1

Scheme 2

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Wiper/Washer Systems

Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check will provide the following information

1. The identification of the control modules which command the system
2. The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using the diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) monitors the control circuit of the wiper relay. The voltage level should be low while the wiper relay is de-energized and near system voltage when the relay is energized. After the BCM receives a low, intermittent, or mist signal from the wiper/washer switch, it responds by applying battery voltage through the wiper relay control circuit to the coil side of the relay, energizing the WIPER Relay. Ground is supplied at all times to the coil side of the WIPER relay from G104.

Conditions for Running the DTC

This DTC can set only when the output is actively being requested by the BCM.

Conditions for Setting the DTC

If the BCM detects a short to ground in the wiper relay control circuit.

Action Taken When the DTC Sets

The BCM will not activate the output.

Conditions for Clearing the DTC

1. The current DTC will become history when the request for the output is removed or when the condition for setting the fault is corrected.
2. The history DTC will clear after 50 consecutive ignition cycles without a fault present.

Reference Information

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) or Wiper/Washer System Description and Operation (Heated Washer System)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-poor)
4. «Wiring Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the underhood fuse block.
2. Connect a test lamp between the control circuit terminal 27 and ground.
3. Command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the body control module. If the test lamp is always OFF, test for a short to ground or an open/high resistance on the control circuit. If the circuit tests normal, test or replace the body control module.
4. If all circuits test normal, test or replace the underhood fuse block.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Underhood Electrical Center or Junction Block Replacement»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
2. «Control Module References»(/cadillac/dts/i-2005-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using the diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The windshield washer function is controlled by the body control module (BCM). When the washer switch is pressed, ground is applied through the switch contacts and the signal circuit to the BCM indicating the wash request. The BCM then applies ground through the control circuit to the coil side of the WSH Relay energizing the relay. With the relay energized, battery voltage from the WPR fuse is applied through the switch contacts of the relay, the WSW/PUMP Fuse, and the control circuit to the windshield washer fluid pump.

This DTC can set only when the output is actively being requested by the BCM.

This DTC sets if the BCM detects a short to battery voltage in the windshield washer pump relay control circuit.

The BCM will not activate the output.

1. The current DTC will become history when the request for the output is removed or when the condition for setting the fault is corrected.
2. The 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

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) or Wiper/Washer System Description and Operation (Heated Washer System)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-poor)
4. «Wiring Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

1. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
2. Connect a test lamp between the control circuit terminal 13 and battery voltage.
3. Command the Wiper Washer Motor ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, test or replace the body control module. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the body control module.
4. If all circuits test normal, test or replace the underhood fuse block.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Underhood Electrical Center or Junction Block Replacement»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
2. «Control Module References»(/cadillac/dts/i-2005-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using the diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The body control module (BCM) monitors the wiper high speed relay control circuit only when wiper high speed mode is active. When the wiper high speed mode is requested, the BCM responds by applying a ground through the wiper high speed relay control circuit to the coil side of the relay, energizing the WPR HI Relay.

This DTC can set only when the output is actively being requested by the BCM.

This DTC sets if the BCM detects a short to battery voltage on the wiper high speed relay control circuit.

The BCM will not activate the output.

1. The current DTC will become history when the request for the output is removed or when the condition for setting the fault is corrected.
2. The 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

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) or Wiper/Washer System Description and Operation (Heated Washer System)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-poor)
4. «Wiring Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

1. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
2. Connect a test lamp between the control circuit terminal 11 and battery voltage.
3. Command the Wiper High Speed Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, test or replace the body control module. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the body control module.
4. If all circuits test normal, test or replace the underhood fuse block.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Underhood Electrical Center or Junction Block Replacement»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
2. «Control Module References»(/cadillac/dts/i-2005-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The body control module (BCM) monitors the windshield wiper switch low signal circuit. When the wiper switch is place in the low position, battery voltage is applied through the switch contacts, a series of resistors, and the wiper switch low signal circuit to the BCM. The BCM then applies battery voltage through the wiper relay control circuit to energize the WPR relay. When energized, battery voltage from the WPR fuse is applied through the switch side of the WPR relay then through the switch side of the WPR HI relay to the windshield wiper motor.

The ignition switch is in the ON position.

The BCM detects a short to ground on the windshield wiper switch low signal circuit.

1. The BCM will not activate the low speed output.
2. The windshield wipers will only operate in the high speed mode.

1. The DTC will clear the current status when the condition for setting the fault is corrected.
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

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) or Wiper/Washer System Description and Operation (Heated Washer System)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-poor)
4. «Wiring Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Circuit/System Verification

Ignition ON, observe the scan tool Windshield Wiper Switch parameter while rotating the wiper switch. The reading should change between Off, Intermittent, and Low.

1. Ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
2. Ignition ON, verify the scan tool Windshield Wiper Switch parameter is not Switch Fault. If Switch Fault, test the windshield wiper switch low signal circuit terminal L for a short to ground. If the circuit tests normal, replace the BCM.
3. If all circuits test normal, test or replace the turn signal/multifunction switch.

Component Testing

Multifunction Switch

1. With the ignition OFF, disconnect the X1 harness connector at the turn signal/multifunction switch.
2. Test the resistance between terminals H and L. Rotate the wiper switch and compare the resistance readings to the values in the Windshield Wiper Switch Values table below for MIST, each DELAY and LOW speed. If the resistance is not within the specified range, replace the turn signal/multifunction switch.
3. Test for infinite resistance between terminals H and K while rotating the wiper switch to MIST, each DELAY and LOW speed positions. If the less than infinite, replace the turn signal/multifunction switch.
4. Test for less than 5 ohms of resistance with the wiper switch in the High speed position. If greater than 5 ohm, replace the turn signal/multifunction switch.
5. Test for infinite resistance between terminals H and J while rotating the wiper switch to MIST, each DELAY and LOW speed positions. If less than infinite, replace the turn signal/multifunction switch.
6. Test for less than 5 ohm of resistance while pressing the WASHER switch. If greater than 5 ohm, replace the turn signal/multifunction switch.

Wiper Switch Values

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Turn Signal Multifunction Switch Replacement»(/cadillac/dts/i-2005-2011/remont/steering-column-switches/#steering-wheel-steering-column)
2. «Control Module References»(/cadillac/dts/i-2005-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

Symptoms - Wiper/Washer Systems

1. Perform «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) , 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 (Wiper and Washers)»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system) or «Wiper/Washer System Description and Operation (Heated Washer System)»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system__wiperwasher-system-description-and-operation-heated) in order to familiarize yourself with the system functions.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Windshield Wiper/Washer System. Refer to «Checking Aftermarket Accessories»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could 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/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
2. «Low Washer Fluid Indicator Malfunction»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
3. «Washer Malfunction»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
4. «Windshield Washer Solvent Heater Malfunction»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
5. «Moisture Sensing Feature Inoperative»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
6. «Wiper Arm Tip Pressure Check»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-arm-tip-pressure-check)
7. «Wiper Blade Element Check»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system__wiper-blade-element-check)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using the diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Wiper Mist, Delay 1-5, and Low are all low speed wiper motor functions that are controlled by the body control module (BCM). When the wiper switch is placed in one of the LOW speed wiper modes, ground is applied through the switch contacts a series of internal resistors and the wiper switch low signal circuit to the BCM. In response to this signal, the BCM energizes the WPR Relay by applying battery voltage through the wiper relay control circuit to the coil side of the relay. This allows battery positive voltage from the WPR fuse to flow through the switch input side of the WPR Relay and out to the switch input side of the WIPER HI Relay. Since the wiper high relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the windshield wiper motor, the motor will operate at low speed.

When the wiper switch is placed in the HIGH speed position, ground is applied through the switch contacts and the wiper switch high signal circuit to the BCM indicating the wiper high speed request. The BCM then energizes WPR Relay as stated above and the WIPER HI Relay by applying ground through the control circuit to the coil side of the relay. With the wiper high relay energized and its switch contacts closed to the high speed control circuit of the wiper motor, the motor will operate at high speed.

Diagnostic Aids

1. A short to ground in the following circuits will open the WPR fuse: Ignition 1 voltage Windshield wiper motor relay coil supply voltage Windshield wiper switch high signal Windshield wiper motor low speed control Windshield wiper motor high speed control
2. A short to B+ on any of the wiper/washer switch signal circuits will open the ground trace in the wiper switch.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) or Wiper/Washer System Description and Operation (Heated Washer System)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-poor)
4. «Wiring Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

BCM and Wiper Switch Verification

1. Ignition ON, observe the scan tool Windshield Wiper Switch and the Wiper Delay Setting parameters. The Windshield Wiper Switch reading should display Off, Intermittent and Low and the Wiper Delay Setting should display 0-5 while rotating the wiper switch through each delay setting to the low position. If one or more of the Wiper Delay Setting parameters are inoperative and the Windshield Wiper Switch low speed parameter functions, replace the turn signal/multifunction switch. If the low speed parameter is inoperative, perform the Multifunction Switch Circuit/System Testing and/or the Multifunction Switch Component Test.
2. With the wiper switch in the HIGH speed mode, observe the scan tool Wiper High Speed Switch parameter. The Wiper High Speed Switch reading should be Active. If not Active, perform the Multifunction Switch Circuit/System Testing and/or the Multifunction Switch Component Test.
3. Observe the scan tool BCM Wiper Park Switch parameter. The reading should display Active when the wipers are parked and Inactive with the wipers ON or out of the park position. If the Wiper Park Switch parameter is always Active or Inactive, perform the Wipers do not Park Circuit/System Testing.
4. If all wiper position parameters displayed correctly on the scan tool, perform the Wiper Motor Circuit/System Testing and/or the Wiper Motor Component Test.

BCM and Wiper Motor Verification

1. Command the windshield wiper motor to the off, low speed and high speed modes with a scan tool. Before commanding the wiper high speed mode, place the wiper switch in the low speed position. The wipers should perform the commanded state. If one or more of the commanded states do not work, perform the Wiper Motor tests in Circuit/System Testing and/or Component test.
2. If all the wiper motor speeds function, perform the Multifunction Switch Circuit/System Testing and/or the Multifunction Switch Component Test.

Multifunction Switch Circuit/System Testing

1. Ignition OFF, disconnect the C1 harness connector at the turn signal/multifunction switch.
2. Ignition OFF, test for less than 15.0 ohms of resistance between the ground circuit terminal H and ground. If greater than 15.0 ohms, test the ground circuit for an open/high resistance. If the circuit tests normal, test or replace the body control module.
3. Verify the scan tool Windshield Wiper Switch parameter is Off. If not Off, test the signal circuit terminal L for a short to ground. If the circuit tests normal, test or replace the body control module.
4. Verify the scan tool Wiper High Speed Switch parameter is Inactive. If not Inactive, test the signal circuit terminal K for a short to ground. If the circuit tests normal, test or replace the body control module.
5. Install a 3A fused jumper wire between the signal circuit terminal L and ground. Verify the scan tool Windshield Wiper Switch parameter is Switch Fault. If not Switch Fault, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the body control module.
6. Install a 3A fused jumper wire between the signal circuit terminal K and ground. Verify the scan tool Wiper High Speed Switch parameter is Active. If not Active, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the body control module.
7. If all circuits test normal, test or replace the turn signal/multifunction switch.

Wipers Do Not Park Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the windshield wiper motor.
2. Ignition ON, verify the scan tool BCM Wiper Park Switch parameter is Inactive. If not Inactive, test the signal circuit terminal C for a short to ground. If the circuit tests normal, test or replace the body control module.
3. Install a 3A fused jumper wire between the wiper motor park switch signal circuit terminal C and ground. Verify the scan tool Wiper Park Switch parameter is Active. If not Active, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the body control module.
4. If all circuits test normal, test or replace the windshield wiper motor.

Wiper Motor Circuit/System Testing

1. Ignition OFF, remove the WPR Relay from the underhood fuse block.
2. Test for less than 5.0 ohms of resistance between the wiper relay ground circuit terminal 86 and ground. If greater than 5.0 ohms, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal 85 and ground.
4. Ignition ON, command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the body control module. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the body control module.
5. Ignition OFF, install the WPR Relay.
6. Remove the WPR HI Relay from the underhood fuse block.
7. Connect a test lamp between the supply voltage circuit terminal 30 and ground.
8. Ignition ON, command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the WPR Relay. If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the WPR Relay.
9. Connect a test lamp between the control circuit terminal 86 and battery voltage.
10. Ignition ON, command the Wiper High Speed Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, test or replace the body control module. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the body control module.
11. Ignition OFF, replace the WPR HI Relay.
12. Disconnect the harness connector at the wiper motor.
13. Test for less than 1.0 ohm of resistance between the wiper motor ground circuit terminal D and ground. If greater than 1.0 ohm, test the ground circuit for an open/high resistance.
14. Connect a test lamp between the control circuit terminal B and ground.
15. Ignition ON, command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the WPR HI Relay. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the WPR HI Relay.
16. Connect a test lamp between the control circuit terminal A and ground.
17. Place the wiper switch in the LOW speed position. Command the Wiper High Speed Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the WPR HI Relay. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the WPR HI Relay.
18. If all circuits test normal, test or replace the Windshield Wiper Motor.

Multifunction Switch

1. With the ignition OFF, disconnect the C1 harness connector at the turn signal/multifunction switch.
2. Test the resistance between terminals H and L. Rotate the wiper switch and compare the resistance readings to the values in the Windshield Wiper Switch Values table below for MIST, each DELAY and LOW speed. If the resistance is not within the specified range, replace the turn signal/multifunction switch.
3. Test for infinite resistance between terminals H and K while rotating the wiper switch to MIST, each DELAY and LOW speed positions. If the less than infinite, replace the turn signal/multifunction switch.
4. Test for less than 5 ohms of resistance with the wiper switch in the High speed position. If greater than 5 ohms, replace the turn signal/multifunction switch.
5. Test for infinite resistance between terminals H and J while rotating the wiper switch to MIST, each DELAY and LOW speed positions. If less than infinite, replace the turn signal/multifunction switch.
6. Test for less than 5 ohms of resistance while pressing the WASHER switch. If greater than 5 ohms, replace the turn signal/multifunction switch.

Wiper Switch Values

Windshield Wiper Motor Dynamic Test

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Turn Signal Multifunction Switch Replacement»(/cadillac/dts/i-2005-2011/remont/steering-column-switches/#steering-wheel-steering-column)
2. «Windshield Wiper Motor Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
3. «Underhood Electrical Center or Junction Block Replacement»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
4. «Control Module References»(/cadillac/dts/i-2005-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Check Washer Fluid message is controlled by the instrument panel cluster 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 minute delay before changing states of the Check Washer Fluid message during an ignition cycle.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) or Wiper/Washer System Description and Operation (Heated Washer System)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-poor)
4. «Wiring Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

1. Verify the windshield washer fluid level is above the minimum level. If not above the minimum level, fill the reservoir and inspect for leaks.
2. Verify the scan tool IPC Washer Fluid Level parameter is OK.

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

Component Test

1. Ignition OFF, disconnect the harness connector at the washer fluid level sensor.
2. Washer fluid level switch open, test for infinite resistance between the signal terminal A and the ground terminal B. If not the specified value, replace the washer fluid level sensor.
3. Washer fluid level switch closed, test for less than 2 ohms of resistance between the signal terminal A and the ground terminal B. If not within the specified range, replace the washer fluid level sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Windshield Washer Solvent Level Switch Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
2. «Control Module References»(/cadillac/dts/i-2005-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for IPC replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The windshield washer function is controlled by the body control module (BCM). When the washer switch is pressed, ground is applied through the switch contacts and the signal circuit to the BCM indicating the wash request. The BCM then applies ground through the control circuit to the coil side of the WSH Relay energizing the relay. With the relay energized, battery voltage is applied through the switch contacts of the relay, the WSW/PUMP Fuse and the control circuit to the windshield washer fluid pump.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) or Wiper/Washer System Description and Operation (Heated Washer System)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-poor)
4. «Wiring Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Washers Inoperative Starting Point

Ignition ON, with a test lamp connected to ground, probe each of the test points on the WSW/PUMP Fuse while activating the washer switch. The test lamp should illuminate at one or both of the fuse test points.

1. If the test lamp does not illuminate at either test point, refer to the «Washer Switch Test»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system__washers-inoperative-starting-point) .

1. If the test lamp illuminates, refer to the «Washer Fluid Pump Test»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system__washers-inoperative-starting-point) .

Washer Switch Test

1. Ignition ON, verify that the scan tool Windshield Washer Switch parameter is Active while pressing the washer switch. If not Active, test the following: Perform the multifunction switch component test. Test the windshield washer switch signal circuit for an open/high resistance. If the washer switch and circuit test normal, test or replace the BCM.
2. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
3. Ignition ON, verify that a test lamp illuminates between the windshield washer pump relay control circuit terminal 13 and battery voltage while pressing the washer switch. If the test lamp does not illuminate, test the washer relay control circuit terminal 13 for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the BCM.
4. If all circuits test normal, test or replace the underhood fuse block.

Washer Fluid Pump Test

1. Ignition OFF, disconnect the harness connector at the windshield washer fluid pump.
2. Test for less than 1 ohm of resistance between the ground circuit terminal B and ground. If greater than 1 ohm, repair the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the washer pump control circuit terminal A and ground while pressing the washer switch. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the underhood fuse block.
4. If all the circuits test normal, test or replace the windshield washer fluid pump.

Washers Always On

1. Remove the WSW fuse from the underhood fuse block. The washer pump should turn OFF. If the washer pump does not turn OFF, test the washer pump control circuit for a short to voltage.
2. Ignition ON, verify the scan tool Windshield Washer Switch parameter is Inactive. If not Inactive, test the following: Perform the multifunction switch component test. Test the windshield washer switch signal circuit for a short to ground. If the washer switch and circuit test normal, test or replace the BCM.
3. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
4. Ignition ON, verify that a test lamp does not illuminate between the windshield washer relay control circuit terminal 13 and battery voltage. If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, test or replace the BCM.
5. If all circuits test normal, test or replace the underhood fuse block.

Multifunction Switch

1. With the ignition OFF, disconnect the C1 harness connector at the turn signal/multifunction switch.
2. Test the resistance between terminals H and L. Rotate the wiper switch and compare the resistance readings to the values in the Windshield Wiper Switch Values table below for MIST, each DELAY and LOW speed. If the resistance is not within the specified range, replace the turn signal/multifunction switch.
3. Test for infinite resistance between terminals H and K while rotating the wiper switch to MIST, each DELAY and LOW speed positions. If the less than infinite, replace the turn signal/multifunction switch.
4. Test for less than 5 ohms of resistance with the wiper switch in the High speed position.. If greater than 5 ohms, replace the turn signal/multifunction switch.
5. Test for infinite resistance between terminals H and J while rotating the wiper switch to MIST, each DELAY and LOW speed positions. If less than infinite, replace the turn signal/multifunction switch.
6. Test for less than 5 ohms of resistance while pressing the WASHER switch. If greater than 5 ohms, replace the turn signal/multifunction switch.

Wiper Switch Values

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Turn Signal Multifunction Switch Replacement»(/cadillac/dts/i-2005-2011/remont/steering-column-switches/#steering-wheel-steering-column)
2. «Washer Pump Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
3. «Underhood Electrical Center or Junction Block Replacement»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-introduction)
4. «Control Module References»(/cadillac/dts/i-2005-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The heated windshield washer fluid operation is controlled by a separate switch located on the turn signal/multifunction switch. When the heated washer fluid switch is pressed, ground is momentarily applied through the switch contacts and the heated washer fluid switch signal circuit to the windshield washer solvent heater assembly. In response to this signal, the washer solvent heater assembly then applies battery voltage to its internal washer fluid heating elements and pulls the heated washer fluid indicator control circuit low commanding the DIC to display the HEATING WASH FLUID WASH WIPES PENDING message. The washer fluid is then heated as it passes through the heater assembly to the windshield.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) or Wiper/Washer System Description and Operation (Heated Washer System)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-poor)
4. «Wiring Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Windshield Washer Solvent Heater Malfunction

1. Ignition OFF, disconnect the C1 harness connector at the windshield washer solvent heater assembly.
2. Test for less than 5 ohms of resistance between the ground circuit terminal 2 and ground. If greater than 5 ohms, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the battery positive voltage circuit terminal 1 and ground. If the test lamp does not illuminate, test the battery positive voltage circuit for a short to ground or an open/high resistance.
4. Ignition OFF, disconnect the C2 harness connector at the windshield washer solvent heater assembly.
5. Test for less than 5 ohms of resistance between the ground circuit terminal 4 and ground. If greater than 5 ohms, test the ground circuit for an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 6 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Connect a test lamp between the heated washer fluid switch signal circuit terminal 1 and battery voltage.
8. The test lamp should turn ON and OFF while pressing and releasing the heated washer fluid switch. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the turn signal/multifunction switch. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the turn signal/multifunction switch.
9. Ignition ON, verify that a test lamp does not illuminate between the heated washer fluid indicator control circuit terminal 2 and ground. If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the instrument panel cluster (IPM).
10. If all circuits test normal, test or replace the windshield washer solvent heater assembly.

Windshield Heated Washer Fluid Indicator Inoperative

1. Ignition OFF, disconnect the C2 harness connector at the windshield washer solvent heater assembly.
2. Ignition ON, install a 3A fused jumper wire between the heated washer fluid indicator control circuit terminal 2 and ground. Verify the DIC displays the HEATING WASH FLUID WASH WIPES PENDING message. If the message is not displayed, test the control circuit for a short to voltage or open/high resistance. If the circuit tests normal, replace the instrument panel cluster (IPM).
3. If all circuits test normal, replace the windshield washer solvent heater assembly.

Windshield Heated Washer Fluid Indicator Always On

1. Ignition OFF, disconnect the C2 harness connector at the windshield washer solvent heater assembly.
2. Ignition ON, the DIC should not display the HEATED WASHER FLUID WASHER SYSTEM OFF message. If displayed, test the heated washer fluid indicator control circuit for a short to ground. If the circuit tests normal, replace the instrument panel cluster.
3. If all circuits test normal, replace the windshield washer solvent heater assembly.

Heated Washer Fluid Switch

1. Ignition OFF, disconnect the C4 harness connector at the turn signal/multifunction switch.
2. Test for infinite resistance between the signal terminal 1 and the ground terminal 2 with the switch in the open position. If less than infinite, replace the turn signal/multifunction switch switch.
3. Test for less than 3 ohms between the signal terminal 1 and the ground terminal 2 with the switch in the closed position. If greater than 3 ohms, replace the turn signal/multifunction switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Turn Signal Multifunction Switch Replacement»(/cadillac/dts/i-2005-2011/remont/steering-column-switches/#steering-wheel-steering-column)
2. «Windshield Washer Solvent Heater Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
3. «Control Module References»(/cadillac/dts/i-2005-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for IPC replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/dts/i-2005-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Accessory voltage is supplied to the outside moisture sensor through the 10A RAP fuse located in the rear fuse block. The sensor is grounded through the ground circuit and G402. Whenever the ignition is in the run or accessory positions, the BCM sends the wiper/washer switch status using a pulse width modulation (PWM) signal through the outside moisture sensor signal 1 circuit to the outside moisture sensor. When a wipe cycle is needed, the moisture sensor sends a PWM voltage signal through the moisture sensor signal 2 circuit back to the BCM requesting the wiper operation.

The outside moisture sensor uses the moisture sensor signal 2 circuit to command wiper motor wipe cycles and to confirm the moisture sensor signal 1 is being received. If at anytime communication between the outside moisture sensor and BCM is lost, the BCM will use the inputs from the windshield wiper/washer switch in the delay positions to operate the wiper motor at continuous variable delay intervals.

Schematic Reference

Wiper/Washer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Wiper/Washer System Description and Operation (Wiper and Washers) or Wiper/Washer System Description and Operation (Heated Washer System)

Electrical Information Reference

1. «Circuit Testing»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-poor)
4. «Wiring Repairs»(/cadillac/dts/i-2005-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Ignition ON, wiper switch in the LO position. The windshield wipers should operate at low speed. If the windshield wipers do not operate, refer to Windshield Wiper System Malfunction .

1. Ignition OFF, disconnect the harness connector at the outside moisture sensor.
2. Test for less than 5.0 ohms of resistance between the ground circuit terminal 3 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between accessory voltage circuit terminal 4 and ground. If the test does not illuminate, test the accessory voltage circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the harness connector at the outside moisture sensor.
5. Disconnect the (X4) harness connector at the body control module (BCM).
6. Ignition ON, test for 8-10 volts between the signal circuit terminal 18 and ground. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the outside moisture sensor. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the outside moisture sensor.
7. Ignition ON, test for 4.0-8.5 volts between the signal circuit terminal 14 and ground. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the outside moisture sensor. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the outside moisture sensor.
8. If all circuits test normal, replace the BCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Windshield Outside Moisture Sensor Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system)
2. «Control Module References»(/cadillac/dts/i-2005-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for IPC replacement, setup, and programming

Wiper Arm Tip Pressure Check

1. Run the wiper arms to the mid-wipe position.
2. Remove the wiper blades from the wiper arms. Refer to «Windshield Wiper Blade Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system) .
3. Attach a scale to the end of the wiper arm and measure the force required to lift the wiper arm perpendicular to the windshield to normal working height (height with the blade attached).
4. Replace the wiper arm if the measurement is not within the specification. Refer to «Windshield Wiper Arm Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system) . Tip Pressure: 9-11 Newtons (32-40 Ounces)

Wiper Blade Element Check

1. Remove the wiper blades from the wiper arms. Refer to «Windshield Wiper Blade Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system) .
2. Look down the length of the blade element.
3. Replace the wiper blade element if the rubber element which contacts the glass is not on the centerline of the blade +/-15 degrees. Refer to «Wiper Blade Element Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system) .
4. Install the wiper blades on the wiper arms. Refer to «Windshield Wiper Blade Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system) .

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Removal Procedure

1. Open the hood.
2. Remove the windshield wiper arms. Refer to «Windshield Wiper Arm Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system) .
3. Remove the hood seal, rear. Refer to «Hood Rear Seal Replacement»(/cadillac/dts/i-2005-2011/remont/exterior-body-panels/#bolted-exterior-body-panels-and-closures) .
4. Remove the push in retainers (2) securing the air inlet grill panels (1) to the vehicle.
5. Disconnect the washer hose connector.
6. Push the washer hose grommet into the plenum area.
7. Remove the air inlet grille panel from the vehicle.

Installation Procedure

1. Position the washer hose and the washer hose grommet through the hole in the plenum area.
2. Press the washer hose grommet into position and ensure that it is fully seated.
3. Install the air inlet grille panels (1) to the vehicle.
4. Connect the washer hose connector.
5. Install the push in retainers (2) in order to secure the air inlet grille panel (1) to the body.
6. Install the windshield wiper arms. Refer to «Windshield Wiper Arm Replacement»(/cadillac/dts/i-2005-2011/remont/wiperwasher-systems/#wiper-system-washer-system) .
7. Close the hood.

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Windshield Glass Cleaning

Clean the windshield with windshield cleaner, GM P/N 1050011 (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.

Blade Element Cleaning

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

Wiper Chatter Repair

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

1. Clean the windshield glass.
2. Clean the wiper blade elements.
3. Perform the wiper arm pressure test.
4. Inspect the wiper blade element set.

Wiper/Washer System Components

The Wiper/Washer System consists of the following components

1. Windshield wiper/washer switch
2. Body control module (BCM)
3. WPR Relay
4. WPR HI Relay
5. Windshield wiper motor
6. Windshield washer fluid pump
7. Windshield washer fluid level switch
8. Rain sensor module
9. Instrument panel cluster (IPC)
10. WPR Fuse 25 A
11. WSW/PUMP Fuse 10 A
12. RAP Fuse 10 A

Refer to Master Electrical Component List .

Power & Grounds

With the ignition in the ON position, accessory voltage is supplied through the 25A WPR fuse to the WIPER relay, the WIPER HI relay and the WSH relay that are all located in the underhood fuse block. Refer to Wiper/Washer Schematics .

G101 provides ground for the windshield wiper motor. G104 provides ground for the WPR relay, the WPR HI relay, the windshield washer fluid pump and the windshield washer fluid level switch.

Modes of Operation

The normal wiper system function positions are as follows

1. MIST
2. DELAY
3. MANUAL LOW
4. MANUAL HIGH
5. WASH

Automatic Modes of Operation

1. AUTOMATIC DELAY
2. AUTOMATIC LOW
3. AUTOMATIC HIGH

Automatic low speed and automatic high speed wiper modes are continuous wiper operations that are controlled by the outside moisture sensor. Automatic low and high speed operation is utilized when the amount of precipitation on the windshield exceeds the automatic delay or low threshold.

Moisture Sensitive Wipers

The outside moisture sensor monitors moisture accumulation on the windshield and uses a windshield wiper/washer switch status input to provide wipe commands to the body control module (BCM). The DELAY positions on the wiper/washer switch are used to activate the AUTOMATIC rain sensing operating mode. They are also used to adjust the level of sensitivity to moisture accumulation, which determines the dwell time for commanding a wiper motor wipe cycle.

Accessory voltage is supplied to the outside moisture sensor through the 10A RAP Fuse, located in the rear fuse block. The sensor is grounded through the ground circuit and G402. Whenever the ignition is in the run or accessory positions, the BCM sends the wiper/washer switch status using a pulse width modulation (PWM) signal through the outside moisture sensor signal 1 circuit to the outside moisture sensor. When a wipe cycle is needed, the moisture sensor sends a PWM voltage signal through the moisture sensor signal 2 circuit back to the BCM requesting the wiper operation.

The outside moisture sensor uses the moisture sensor signal 2 circuit to command wiper motor wipe cycles and to confirm the moisture sensor signal 1 is being received. If at anytime communication between the outside moisture sensor and BCM is lost, the BCM will use the inputs from the windshield wiper/washer switch in the delay positions to operate the wiper motor at continuous variable delay intervals.

Low Speed Operation

When the wiper switch is in the low speed position, ground is applied through a resistor internal to the switch and the wiper switch low signal circuit to the body control module (BCM). In response to this signal, the BCM energizes the WPR relay by applying battery voltage through the wiper relay control circuit to the coil side of the relay. This allows battery positive voltage from the WPR fuse to flow through the switch input side of the WPR relay and out to the switch input side of the WPR HI relay. Since the wiper high relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the windshield wiper motor, the motor will operate at low speed.

Wiper motor low speed operation and the WPR relay can also be commanded ON/OFF by using a scan tool. Refer to Control Module References .

Mist Operation

Windshield wiper/washer system MIST operation is identical to wiper Low 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 wipe cycle is complete. If the wiper switch is moved to the mist position and held, the wiper motor will operate in the low mode until the switch is released.

Delay Operation

Windshield wiper delay operation is a low speed wiper motor function with a variable delay interval between the wiper motor cycles. The delay interval is determined by a series of 6 resistors within the wiper/washer switch. The body control module (BCM) monitors the wiper switch low signal circuit to determine the delay interval between the low speed wiper motor wipe cycles.

High Speed Operation

When the wiper switch is in the high speed position, ground is applied through the windshield wiper switch high signal circuit to the body control module (BCM) indicating the wiper high speed request. In response to this signal, the BCM then energizes the WPR relay, as stated above, and the WPR HI relay by applying ground through the control circuit to the coil side of the relay. With the wiper high relay energized and its switch contacts closed to the high speed control circuit of the wiper motor, the motor will operate at high speed.

The wiper high speed relay can also be commanded ON/OFF by using a scan tool. However, before commanding the wiper motor high speed mode ON/OFF using a scan tool, the WPR relay must be energized by placing the wiper switch in the low speed position. Refer to Control Module References .

Wash Operation

When the windshield Wash switch is pressed, ground is applied through the switch contacts and the windshield washer switch signal circuit to the body control module (BCM) indicating the windshield wash request. The BCM then energizes the WPR relay, as stated above, and the WSH relay by applying ground through the control circuit to the coil side of the relay. With the wash relay energized, battery voltage from the WPR fuse is applied through the switch side of the relay and out to the control circuit of the windshield washer fluid pump. The wiper motor will operate for 2 wipe cycles after the wash switch is released.

The WSH relay can also be commanded ON/OFF by using a scan tool. Refer to Control Module References .

Park Position Operation

Windshield wiper motor park operation is controlled by the body control module (BCM) using an input from the park switch that is located within the wiper motor assembly. The BCM monitors the windshield wiper motor park switch signal circuit, to determine if the windshield wiper blades are at the bottom of the glass. During wiper operation, each time the wiper blades are at the bottom of the glass, the park switch is momentarily closed to ground signaling the BCM the wiper 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 ignition is turned OFF while the wipers are in mid-cycle, the wipers will stop immediately where they are. The BCM will park the wipers the next time the ignition is turned ON.

Washer Fluid LOW ADD FLUID Message

The WASHER FLUID LOW ADD FLUID message is controlled by the instrument panel cluster (IPC) using an input from the washer fluid level switch. With the ignition in the ON position, the IPC applies ignition voltage through an internal resistor and the windshield washer fluid level signal circuit to the windshield washer fluid level switch. The IPC then monitors this voltage to determine the washer fluid level. With the washer fluid above a determined level, the washer fluid level switch is open and the IPC detects voltage on the signal circuit. 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 is pulled low and the IPC displays the WASHER FLUID LOW ADD FLUID message on the driver information center (DIC). In order to prevent the WASHER FLUID LOW ADD FLUID message from being displayed while sloshing is occurring in the washer fluid container, the IPC is programed with a 1 minute delay before changing states of the WASHER FLUID LOW ADD FLUID message during an ignition cycle.

Wiper/Washer System Description and Operation (Heated Washer System)

The heated windshield washer system consists of the following components

1. Windshield washer solvent heater assembly
2. Heated washer fluid switch
3. WSW HTD Fuse 60 A
4. HTD/COOL/IGN3 Fuse 10 A
5. Ground G304
6. Ground G300

The body control module (BCM) is also involved in the operation of the heated windshield washer system.

Refer to Master Electrical Component List .

Heated Washer System Operation

The intent of the Heated Washer Fluid Feature is to automatically clear the windshield of snow or ice upon activation. The system may also be used to improve the bug clearing performance of the wash feature under summer driving conditions. Approximately 5 seconds after the ignition is turned on the washer solvent heater assembly will enter standby mode. During standby mode the heater assembly turns on 1 of the 3 heater elements to maintain a solvent temperature of 56°C (132°F). When the heated wash switch is pressed, the driver information center (DIC) will display the HEATING WASH FLUID WASH WIPES PENDING message for 2 seconds and the heater assembly heats the wash fluid to approximately 70°C (160°F). The total duration of the initial heat up cycle may take up to 45 seconds. Once the proper temperature is reached, the heater assembly will request the body control module (BCM) to activate the windshield wash cycle. The heater assembly will maintain an active wash request until the wash fluid temperature drops to 40° C when the wash cycle request will be de-activated allowing the wash fluid to heat up again. The fluid heating and wash application will automatically be repeated 3 more times. Upon completion of the 4 wash cycles, the system will transition to off. The automatic heated wash mode may be terminated at any time by pressing the heated washer fluid switch. The DIC will then display the HEATED WASHER FLUID WASHER SYSTEM OFF message.

Heated Washer System Power & Grounds

High current battery voltage is supplied to the windshield washer solvent heater assembly from the 60A WSW HTD Fuse located in the underhood fuse block. The washer solvent heater uses this voltage to power the 3 heater coils. Battery positive voltage from the 10A HTD/COOL/IGN3 Fuse located in the rear fuse block is applied to the windshield washer solvent heater assembly with the ignition in the ON position. This voltage is used to power up the logic in the heater assembly. The washer solvent heater assembly is supplied with 2 separate ground circuits from G304. One circuit is used to supply ground to the logic side of the heater assembly and the second one is used as a ground for the 3 heater coils. Ground is supplied to the heated washer fluid switch from G300. Refer to Wiper/Washer Schematics .

Heated Washer System Circuit Description

The washer solvent heater assembly provides a 5 volt reference voltage through the heated washer fluid switch signal to the heated washer fluid switch located on the Turn Signal/Multifunction Switch stalk. When the heated washer fluid switch is pressed, the signal circuit is closed to ground and the 5 volt supply is dropped across the resistor indicating the heated wash cycle request. The heater assembly sends a low side drive pulse width modulation (PWM) signal through the heated washer indicator signal circuit requesting the instrument panel cluster (IPC) to display the DIC HEATING WASH FLUID WASH WIPES PENDING message. After the above mentioned washer solvent temperature is reached, the heater assembly pulls the windshield washer switch signal circuit low requesting the BCM to activate the wash cycle.

Automatic Shutdown Protection Feature

Below are automatic shutdown modes built into the heated wash system. When any of these modes are activated, the heated assembly will shut down and request the IPC to transition the DIC to display the HEATED WASHER FLUID WASHER SYSTEM OFF message.

1. Under Voltage - The system will shut down if battery voltage goes under 10 volts for 5 seconds.
2. Fail to Heat - The system will shut down if the fluid does not heat by 5°C (41°F) within 28 seconds.
3. Fail to Cool - The system will shut down if the fluid does not cool by 2°C 936°F) 4.75 seconds.

The following shutdown modes will require an ignition cycle to resume normal operation

1. Printed Circuit Board (PCB) Temperature Over Threshold - The system will shut down if the unit PCB is greater than 125°C (257°F) for more than 2 seconds.
2. Temperature Sensor Shorted High - An internal heater assembly measurement. The system will shut down if an internal short is detected.
3. Automatic Over Temperature - The system will shut down if fluid temperature exceeds 85°C (185°F) for 2 seconds.
4. Automatic Over Voltage - The system will shut down if battery voltage exceeds 16.4 volts for 4 seconds.

Special Tools

Illustration Tool Number/ Description J 39232 Wiper Linkage Separator J 39529 Wiper Linkage Installer J 39637 Wiper Arm Puller

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Underhood Electrical Center or Junction Block Replacement
• Turn Signal Multifunction Switch Replacement
• Checking Aftermarket Accessories
• Front Wheelhouse Liner Replacement
• Fastener Notice
• Hood Rear Seal Replacement
• Vehicle Direction Alert Alarm Warning Module Replacement
• Master Electrical Component List
• DTC B3715
• Wiper/Washer System Description and Operation (Heated Washer System)
• Wiper Arm Tip Pressure Check
• Wiper Blade Element Check
• Washer Switch Test
• Fastener Tightening Specifications