Wiper System and Washer System Cadillac DeVille Concours

DESCRIPTION & OPERATION

Wipers use a depressed park system (wipers park below bottom of windshield). System uses a 2-speed wiper motor. A washer motor is attached to the washer fluid reservoir. A circuit board on the wiper motor cover controls power to the washer motor. (Scheme 1)and (Scheme 2).

On vehicles with pulse (intermittent) system, if wiper switch is in DELAY position, a time delay occurs between wiping sweeps (on vehicles with variable delay, time delay may vary between wiper sweeps). The circuit board on the wiper motor cover controls the delay function.

Some vehicles may be equipped with a rain sense wiper system. System automatically operates wipers when moisture is sensed on windshield by rain sense module. System operates only when wiper switch is in one of the AUTO DELAY positions. Speed and duration of wipers is controlled electronically by rain sense module and wiper motor cover. Rain Sense module is mounted on passenger interior side of front windshield near rearview mirror.

WIPER ARMS

1. In park position, distance between upper edge of each wiper arm and bottom of parking ramp should be 1" (25.4 mm). Move wipers to outer wipe position (top of sweep). Distance between left wiper arm and vertical edge of windshield should be 3 1/16" (78 mm) maximum.
2. While wipers are operating, wiping pattern of right blade should overlap wiping pattern of left blade. If wiper arms are not positioned as specified, remove and reposition wiper arms.

With Rain Sense Module

1. Disconnect wiper motor 3-pin connector. Turn ignition switch to RUN position. Turn wiper switch to HI position. Connect test light between chassis ground and Purple wire terminal of wiper motor connector. If test light is off, go to step 6).
2. If test light is on, connect test light between Purple wire and Black wire terminal of wiper motor 3-pin connector. If test light is off, repair open Black wire.
3. If test light is on, reconnect wiper switch connector. Disconnect wiper motor 8-pin connector. Connect test light between chassis ground and Gray wire terminal of wiper motor 8-pin connector. If test light is on, go to next step. If test light is off, check for open Gray wire. If Gray wire is okay, replace wiper switch.
4. Turn wiper switch to LO position. Connect test light between chassis ground and Dark Green wire terminal of wiper motor 8-pin connector. If test light is on, go to next step. If test light is off, check for open Dark Green wire. If Dark Green wire is okay, replace wiper switch.
5. Using a DVOM, check continuity of Yellow wire between wiper motor 3-pin and 8-pin connectors. If there is no continuity, repair open Yellow wire. If there is continuity, check for poor wiring connection at wiper motor. If connection is okay, replace wiper motor cover (circuit board). (Scheme 1)and (Scheme 2). If symptom still exists, replace wiper motor.
6. Reconnect wiper motor 3-pin connector. Disconnect wiper switch connector. Turn ignition switch to RUN position. Connect test light between chassis ground and Yellow wire terminal of wiper switch connector. If test light is off, go to next step. If test light is on, check for poor connection between accessory relay and wiper switch. Repair as necessary. If connections are okay, repair open Yellow wire. If wire is okay, replace wiper switch.
7. Reconnect wiper switch connector. Connect test light between chassis ground and Orange wire terminal of accessory relay connector. If test light is on, go to next step. If test light is off, replace fuse or repair open Orange wire.
8. Connect test light between chassis ground and Yellow wire terminal (10-amp fuse side) of accessory relay connector. If test light is on, go to next step. If test light is off, replace fuse or repair open Yellow wire.
9. Connect test light between Yellow wire terminal (10-amp fuse side) of accessory relay connector and Black wire terminal (ground wire). If test light is on, check for open Yellow wire between accessory relay and wiper switch. If Yellow wire is okay, replace accessory relay. If test light is off, repair Black ground wire.

Without Rain Sense Module

1. Disconnect wiper switch connector. Turn ignition switch to RUN position. Connect test light between chassis ground and Yellow wire terminal of wiper switch connector. If test light is off, go to step 6).
2. If test light is on, disconnect wiper motor 3-pin connector. Connect test light between battery voltage and Black wire terminal of wiper motor 3-pin connector. If test light is off, repair open Black wire.
3. If test light is on, reconnect wiper switch connector. Disconnect wiper motor 6-pin connector. Connect test light between chassis ground and Dark Green wire terminal of wiper motor 6-pin connector. If test light is on, go to next step. If test light is off, check for open Dark Green wire. If Dark Green wire is okay, replace wiper switch.
4. Turn wiper switch to LO position. Connect test light between chassis ground and Gray wire terminal of wiper motor 6-pin connector. If test light is on, go to next step. If test light is off, check for open Gray wire. If Gray wire is okay, replace wiper switch.
5. Check for continuity in Yellow wire between wiper motor 3-pin and 6-pin connectors. If there is no continuity, repair open Yellow wire. If there is continuity, check for poor wiring connection at wiper motor. If connection is okay, replace wiper motor cover (circuit board). (Scheme 1)and (Scheme 2). If symptom still exists, replace wiper motor.
6. Connect test light between chassis ground and Orange wire terminal of accessory relay connector. If test light is on, go to next step. If test light is off, replace fuse or repair open Orange wire.
7. Connect test light between chassis ground and Yellow wire terminal (10-amp fuse side) of accessory relay connector. If test light is on, go to next step. If test light is off, replace fuse or repair open Yellow wire.
8. Connect test light between Yellow wire terminal (10-amp fuse side) of accessory relay connector and Yellow wire terminal (ground wire). If test light is on, check for open Yellow wire between accessory relay and wiper switch. If test light is off, repair Yellow ground wire.

Scheme 1

Scheme 2

1. Disconnect wiper motor 8-pin connector. Turn ignition switch to RUN position. Turn wiper switch to LO position. Connect test light between chassis ground and Gray wire terminal of wiper motor 8-pin connector. If test light is on, go to next step. If test light is off, check for open Gray wire. If Gray wire is okay, replace wiper switch.
2. Connect test light between chassis ground and Dark Green wire terminal of wiper motor 8-pin connector. If test light is on, go to next step. If test light is off, check for open Dark Green wire. If Dark Green wire is okay, replace wiper switch.
3. Check for poor connection at wiper motor 8-pin connector. Repair as necessary. If connection is okay, reconnect wiper motor connector. Disconnect wiper motor 3-pin connector. Connect test light between chassis ground and Yellow wire terminal of wiper motor 3-pin connector.
4. If test light is on, check for poor connection at wiper motor 3-pin connector. If connection is okay, replace wiper motor. If test light is off, check for open Yellow wire. If Yellow wire is okay, replace wiper motor cover (circuit board). (Scheme 1)and (Scheme 2).

1. Disconnect wiper motor 6-pin connector. Turn ignition switch to RUN position. Turn wiper switch to LO position. Connect test light between chassis ground and Gray wire terminal of wiper motor 6-pin connector. If test light is on, go to next step. If test light is off, check for open Gray wire. If Gray wire is okay, replace wiper switch.
2. Connect test light between chassis ground and Dark Green wire terminal of wiper motor 6-pin connector. If test light is on, go to next step. If test light is off, check for open Dark Green wire. If Dark Green wire is okay, replace wiper switch.
3. Using a DVOM, check continuity of Yellow wire between wiper motor 3-pin and 6-pin connectors. If there is no continuity, repair open Yellow wire. If there is continuity, check for poor wiring connection at wiper motor. If connection is okay, replace wiper motor cover (circuit board). (Scheme 1)and (Scheme 2). If symptom still exists, replace wiper motor.

WIPERS RUN AT LOW SPEED ONLY (HIGH SPEED INOPERATIVE)

Disconnect 3-pin connector from wiper motor. Turn ignition switch to RUN position. Turn wiper switch to HI position. Connect test light between chassis ground and Purple wire terminal of wiper motor 3-pin connector. If test light is on, check for poor wiring connection at wiper motor. If connection is okay, replace wiper motor. If test light is off, check for open Purple wire. If Purple wire is okay, replace wiper switch.

Pulse System Only

1. Remove wiper system fuse. Connect an ammeter (0-30 amp) across fuse block terminals. Turn ignition switch to RUN position. Turn wiper switch to LO position. Note lowest current draw while wipers are running on dry glass (current draw will fluctuate).
2. If lowest current draw is less than 3.5 amps, replace wiper motor. If lowest current draw is more than 6.5 amps, go to next step. If lowest current draw is less than 6.5 amps, test is complete.
3. Replace wiper blade elements and repeat test. If lowest current draw is still more than 6.5 amps, go to next step. If lowest current draw is not more than 6.5 amps, test is complete.
4. Disconnect drive link from wiper motor crank arm and repeat test. If lowest current draw is still more than 6.5 amps, replace wiper motor. If lowest current draw is not more than 6.5 amps, wiper linkage is binding. Replace or repair as required, and repeat test.

1. Disconnect rain sense module connector. Turn ignition switch to RUN position. Turn wiper switch to OFF position. If wipers operate, go to next step. If wipers do not operate, replace rain sense module.
2. Reconnect rain sense module connector. Disconnect wiper motor 3-pin connector. Turn ignition switch to RUN position. Using a DVOM, measure voltage between chassis ground and Purple wire terminal of wiper motor 3-pin connector. If zero volts is present, go to step 4). If battery voltage is present, reconnect wiper motor connector.
3. Disconnect wiper switch connector. Check continuity between Yellow wire terminal and Purple wire terminal (switch side of connector). If there is continuity, replace wiper switch. If there is no continuity, check for short to battery voltage in Purple wire. If Purple wire is okay, replace wiper motor cover (circuit board).
4. Reconnect wiper motor 3-pin connector. Disconnect wiper motor 8-pin connector. Measure voltage between chassis ground and Gray wire terminal of wiper motor 8-pin connector. If zero volts is present, repair short to battery voltage in Yellow wire between 3-pin and 8-pin wiper motor connectors. If Yellow wire is okay, replace wiper motor cover (circuit board).
5. If battery voltage is present, check for short to battery voltage in Gray wire. If Gray wire is okay, replace wiper switch.

1. Disconnect wiper motor 6-pin connector. Turn ignition switch to RUN position. Turn wiper switch to OFF position. Using a DVOM, measure voltage between chassis ground and Gray wire terminal of wiper motor 6-pin connector.
2. If zero volts is present, go to next step. If battery voltage is present, check for short to battery voltage in Gray wire. If Gray wire is okay, replace wiper switch.
3. Disconnect wiper motor 3-pin connector. Measure voltage between chassis ground and Purple wire terminal of wiper motor 3-pin connector. If zero volts is present, go to next step. If battery voltage is present, check for short to battery voltage in Purple wire. If Purple wire is okay, replace wiper switch.
4. Measure voltage between chassis ground and Yellow wire terminal of wiper motor 3-pin connector. If zero volts is present, replace wiper motor. If battery voltage is present, repair short to battery voltage in Yellow wire between wiper motor 3-pin and 8-pin connectors.

WIPERS CYCLE IN/OUT OF PARK POSITION AFTER WIPERS SHUT OFF

If wipers do not operate in LO position, go to WIPERS RUN AT HIGH SPEED ONLY (LOW SPEED INOPERATIVE) . If wipers operate in LO position, replace wiper park switch. See WIPER PARK SWITCH under REMOVAL & INSTALLATION. If symptom still exists, replace wiper motor, then repeat test.

1. Disconnect rain sense module connector. Turn ignition switch to RUN position. Connect test light between Yellow wire terminal and Black wire terminal of rain sense module connector. If test light is on, go to next step. If test light is off, connect test light between chassis ground and Yellow wire terminal of rain sense module connector. If test light is on, repair open in Black wire. If test light is off, repair open in Yellow wire between rain sense module connector and fuse block.
2. Turn ignition off. Disconnect wiper switch connector. Using a DVOM, check continuity of Pink wire between wiper switch connector terminal and rain sense module connector terminal. If there is continuity, go to next step. If there is no continuity, repair open Pink wire.
3. Check for poor connection at rain sense module connector. Repair as necessary. If connector is okay, reconnect rain sense module connector. Using a DVOM, measure resistance between Pink wire and Yellow wire terminals of wiper switch connector (switch side of connector). Move wiper switch through entire auto delay range. Resistance should vary from about 110 k/ohms to 1.2 megohms.
4. If resistance is not as specified, replace wiper switch. If resistance is as specified, measure resistance in any auto delay position between Yellow wire and Gray wire terminals of wiper switch connector (switch side of connector).
5. If resistance is more than 3 ohms, replace wiper switch. If resistance is less than 3 ohms, reconnect wiper switch connector. Disconnect wiper motor 8-pin connector. Measure resistance of Light Green wire between rain sense module connector terminal and wiper motor connector terminal. If resistance is more than 3 ohms, repair Light Green wire.
6. If resistance is less than 3 ohms, measure resistance of Light Blue wire between rain sense module connector terminal and wiper motor connector terminal. If resistance is more than 3 ohms, repair Light Blue wire. If resistance is less than 3 ohms, replace wiper motor cover (circuit board). (Scheme 1)and (Scheme 2). If symptom still exists, replace rain sense module.

1. Turn ignition switch to OFF position. Disconnect wiper switch connector. Turn wiper switch to DELAY position. Using a DVOM, measure resistance between Yellow wire and Pink wire terminals of wiper switch connector (switch side of connector). Move wiper switch through entire delay range.
2. Resistance should vary from about 91 k/ohms to 1.2 megohms. If resistance is not as specified, replace wiper switch. If resistance is as specified, measure resistance between Yellow wire and Gray wire terminals of wiper switch connector (switch side of connector).
3. If resistance is more than 3 ohms, replace wiper switch. If resistance is less than 3 ohms, check for open Gray wire or Pink wire between wiper switch and wiper motor. If circuits are okay, remove wiper motor cover (circuit board). (Scheme 1)and (Scheme 2).
4. Check to see if park switch pulse terminals are touching pads on circuit board. If contacts are touching pads, replace wiper motor cover (circuit board). (Scheme 1)and (Scheme 2). If contacts are not touching pads, replace park switch spring contacts.

1. Disconnect washer motor connector. Turn ignition switch to RUN position. Connect test light between terminals of washer motor connector. While observing test light, activate washer switch. If test light is off, go to next step. If test light is on, check for poor wiring connection at washer motor. If connection is okay, replace washer motor.
2. Connect test light between chassis ground and Red wire terminal of washer motor connector. Activate washer switch. If test light is off, go to next step. If test light is on, check for open Dark Blue wire between washer motor and wiper motor. If Dark Blue wire is okay, replace wiper motor (internal ground circuit is open).
3. Reconnect washer motor connector. Disconnect rain sense module connector. Turn ignition switch to RUN position. Connect test light between Yellow wire and Black wire terminals of rain sense module connector. If test light is on, go to next step. If test light is off, connect test light between chassis ground and Yellow wire terminal of rain sense module connector. If test light is on, repair open Black wire. If test light is off, repair open Yellow wire between rain sense module and fuse block.
4. Connect test light between chassis ground and Pink wire terminal of rain sense module connector. While observing test light, activate washer switch. If test light is on, go to next step. If test light is off, check for open Pink wire. If Pink wire is okay, replace wiper switch.
5. Check for poor connection at rain sense module connector. Repair as necessary. If connector is okay, reconnect rain sense module connector. Disconnect wiper motor 8-pin connector. Connect test light between chassis ground and Light Green wire terminal of wiper motor 8-pin connector. While observing test light, activate washer switch. If test light is on, go to next step. If test light is off, check for open Light Green wire. If Light Green wire is okay, replace rain sense module.
6. Connect test light between chassis ground and Gray wire terminal of wiper motor 8-pin connector. While observing test light, activate washer switch. If test light is on, go to next step. If test light is off, check for open Gray wire. If Gray wire is okay, replace wiper switch.
7. Check for poor connection at wiper motor module connector. Repair as necessary. If connector is okay, reconnect wiper motor connector. Disconnect washer motor connector. Using a DVOM, check continuity of Red wire between wiper motor and washer motor connectors. If there is continuity, replace wiper motor cover (circuit board). (Scheme 1)and (Scheme 2). If symptom still exists, replace rain sense module. If there is no continuity, repair open Red wire.

1. Disconnect washer motor connector. Turn ignition switch to RUN position. Connect test light between terminals of washer motor connector. While observing test light, activate washer switch. If test light is off, go to next step. If test light is on, check for poor wiring connection at washer motor. If connection is okay, replace washer motor.
2. Connect test light between chassis ground and Red wire terminal of washer motor connector. Activate washer switch. If test light is off, go to next step. If test light is on, check for open Dark Blue wire between washer motor and wiper motor. If Dark Blue wire is okay, replace wiper motor (internal ground circuit is open).
3. Using a test light, back probe from Red wire terminal of wiper motor 6-pin connector to ground. If test light is off, go to next step. If test light is on, check for poor wiring connection or open Red wire between wiper motor and washer motor. Repair as necessary.
4. Using a DVOM, measure voltage between chassis ground and Pink wire terminal of wiper switch connector. Activate washer switch. If zero volts is present, replace wiper switch. If battery voltage is present, check for open Pink wire or poor wiring connection. If Pink wire and connection are okay, replace wiper motor cover (circuit board). (Scheme 1)and (Scheme 2).

1. Disconnect rain sense module connector. Turn ignition switch to RUN position. Turn wiper switch to OFF position. Using a DVOM, measure voltage between chassis ground and Pink wire terminal of rain sense module connector. If zero volts is present, go to next step. If battery voltage is present, check for short to battery voltage in Pink wire. If Pink wire is okay, replace wiper switch.
2. Reconnect rain sense module connector. Disconnect wiper motor 8-pin connector. Measure voltage between chassis ground and Light Green wire terminal of wiper motor 8-pin connector. If zero volts is present, check for short to battery voltage in washer motor Red wire. If Red wire is okay, replace wiper motor cover (circuit board). If battery voltage is present, check for short to battery voltage in Light Blue wire. If Light Blue wire is okay, replace rain sense module.

1. Turn ignition switch to RUN position. Turn wiper switch to LO position. Disconnect wiper motor 6-pin connector. Connect test light between wiper motor case (ground) and Pink wire terminal of wiper motor 6-pin connector.
2. Momentarily activate washer switch while observing test light. If test light is on when switch is released, replace wiper switch. If test light is off, replace wiper motor cover (circuit board). (Scheme 1)and (Scheme 2).

REMOVAL & INSTALLATION

RAIN SENSE MODULE

Note. Rain Sense modules are available in 2 different designs. One design is for heated windshields, and the other design is for non-heated windshields. Correct module must be installed or improper operation will occur. Module for heated windshields have a nub on side opposite electrical connector.

Removal

Using tape on outside of windshield, mark horizontal and vertical position of rain sense module. Disconnect electrical connector. Using heat gun with a maximum of 740 watts, at a distance of 6 inches or more from windshield, apply heat to module area of windshield in a circular motion. Twist module to remove from windshield.

Installation

Cover instrument panel with protective cloth. Using a sharp plastic scraper, remove optical tape from windshield. Using cloth and cleaning solution, clean windshield thoroughly. Remove Red backing from optical tape and install module to windshield. Ensure module is positioned correctly. Hold module firmly against windshield for 10-15 seconds. Attach electrical connector. Check module operation.

1. Turn ignition switch to RUN position. Turn wiper switch to DELAY position (or LO position on vehicles without pulse system). When wipers are at inner wipe position (bottom of sweep), turn ignition off. Mark position of wiper blades in relation to windshield for installation reference.
2. Disconnect washer fluid hose. Remove protective cap for access to wiper arm nut. Lift wiper arm and insert a pin or pop rivet through holes next to wiper arm pivot to hold wiper blade away from windshield.
3. Remove nut. Pull wiper arm off of splined shaft using a battery terminal puller, if necessary. To install, reverse removal procedure using NEW nut. Ensure wiper arms are correctly positioned. See WIPER ARMS under «ADJUSTMENTS»(/cadillac/deville-concours/1994-1998/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

1. Remove A/C pipe shroud. Remove wiper arms. See WIPER ARMS under «ADJUSTMENTS»(/cadillac/deville-concours/1994-1998/remont/wiperwasher-systems/#wiper-system-and-washer-system) . Disconnect negative battery cable. Remove shroud air inlet panel (cowl vent screen). Disconnect wiper motor electrical connectors. Separate drive link from crank arm.
2. Remove A/C pipe shroud bracket from wheelwell. Remove wiper motor screws. Remove wiper motor, guiding crank arm through hole. To install, reverse removal procedure. Ensure wiper arms are correctly positioned. See WIPER ARMS under «ADJUSTMENTS»(/cadillac/deville-concours/1994-1998/remont/wiperwasher-systems/#wiper-system-and-washer-system) .

Remove wiper motor assembly (if necessary). Remove screws and wiper motor cover. (Scheme 1)and (Scheme 2). Ensure wiper motor is in park position. Ensure drive pin is positioned as illustrated. (Scheme 2) To complete installation, reverse removal procedure.

Remove wiper motor cover (circuit board). See WIPER MOTOR COVER (CIRCUIT BOARD). If wiper motor is in park position, operate motor until lock pawl can be removed from relay slot. (Scheme 2) Remove screw and park switch.

To install, reverse removal procedure. Before installing wiper motor cover, ensure wiper motor is in park position. Ensure drive pin is positioned as illustrated. (Scheme 2) To complete installation, reverse removal procedure.

Remove wiper arms. See WIPER ARMS under ADJUSTMENTS . Remove cowl panel vent screen(s). Separate drive link from crank arm. Remove screws securing drive link assembly to body. Remove drive link assembly through access hole in shroud. To install, reverse removal procedure. Ensure wiper arms are correctly positioned. See WIPER ARMS under ADJUSTMENTS .

WIPER/WASHER SWITCH

Wiper/washer switch is an integral part of multifunction switch. See appropriate STEERING COLUMN SWITCHES article.

Remove air filter housing. Reposition powertrain control module. Remove screw securing top of fluid reservoir. Remove left front wheel. Remove left side wheelwell panel extension. Disconnect 2 electrical connectors. Remove washer hose. Remove 2 nuts and fluid reservoir. Pull washer motor from fluid reservoir. To install, reverse removal procedure.

Front Wiper/Washer System Wiring Diagram (All Models W/ Rain Sense Module). Scheme 3

Front Wiper/Washer System Wiring Diagram (All Models W/O Rain Sense Module). Scheme 4

See also:
• COMPUTER RELEARN PROCEDURES
• STEERING COLUMN SWITCHES
• WIPERS RUN AT HIGH SPEED ONLY (LOW SPEED INOPERATIVE)