Wiper System and Washer System — GMC Savana I (1996-2002)

DESCRIPTION

Wiper system consists of a 2-speed, positive-park, permanent-magnet motor. Combined wiper and washer switch, mounted on end of multifunction switch (turn signal) lever, controls system. Wiper motor and transmission assembly is mounted to tube frame under air inlet screen. Vehicle is equipped with a pulse wipe delay. Power for wiper/washer system is provided by a 25-amp WIPER fuse located in the fuse block. Wiper motor is protected by an internal, self-resetting circuit breaker. Washer motor is mounted on reservoir located in engine compartment.

OPERATION

Electronic circuit board controls all timing and washer commands. When PUSH washer switch is pressed for more than one second, washer fluid is sprayed on windshield as long as washer switch is held. Wiper will operate for 6 seconds after washer switch is released. Wiper motor operates in either low or high speed, depending on switch position. Rotating switch to DELAY position operates wiper intermittently, and delay can be varied from zero to 43 seconds by rotating switch back and forth. Immediate wiping can be activated by rotating switch to MIST position. Wiping action will continue as long as switch is held.

ADJUSTMENTS

Do not interchange left and right wiper arms. Wiper arms are stamped LH and RH. Install wiper arms onto drive shafts while measuring distance between wiper blade tip and air inlet grille panel. Distance should be 2.75" (70 mm.) for left wiper arm and 2.56" (65 mm.) for right wiper arm while holding measuring device perpendicular to wiper blade.

SYSTEM CHECK

Note. When performing following checks, maintain some moisture on front windshield so that wiper motor does not overheat.

Turn ignition switch to RUN position. Leave wiper switch in OFF position. Depress washer switch 2-4 seconds and release. Wipers should operate at low speed and washers should spray as long as washer switch is held in ON position. After releasing washer switch, washers should stop and wipers should return to park position after 2-4 sweeps.
Move wiper switch to DELAY position. Activate delay time by turning wiper switch through delay range. Wipers should make one complete sweep, then pause for 0-25 seconds before making next sweep.
Ensure wiper switch is in DELAY position. Hold washer switch on for 1-2 seconds. Washer switch should spray as long as washer switch is held in ON position. Wipers should run at low speed during spray period, continue for 2-4 sweeps after spray cycle, and then return to delay mode.
Move wiper switch to LOW position. Wipers should run continuously at low speed. Move wiper switch to HIGH position. Wipers should run continuously at high speed.
Move wiper switch to OFF position. Wipers should return to park position at low speed. Move wiper switch to MIST position. Wipers should make one complete sweep and return to park position. If wipers do not function properly, perform «PRELIMINARY INSPECTION»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system__preliminary-inspection) .

PRELIMINARY INSPECTION

Check the following items prior to performing any test procedures

Check WIPER fuse (No. 11).
Check chassis ground point located behind left kick panel, near fuse box.
Check wiper arm and blade condition.
If some (but not all) delay or low speeds are inoperative, replace multifunction switch.
Ensure aftermarket equipment is not improperly installed and interfering with operation of wiper/washer system. Correct any obvious problems before continuing testing. If problem still exists, identify wiper/washer symptom and perform appropriate system test. See «SYMPTOM INDEX»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system) under SYSTEM TESTS.

SYSTEM TESTS

WARNING

Vehicle is equipped with Supplemental Restraint System (SRS). Air bag system must be disabled before servicing any steering column component. Disabling system will prevent accidental air bag deployment, resulting in possible serious injury or property damage. See DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article.

Note. Before performing any SYSTEM TESTS, perform SYSTEM CHECK under TROUBLESHOOTING.

Symptom	Perform Test
Washers Inoperative, Wipers Operate	1
Washer Pumps Continuously	2
Wipers Do Not Run In Any Mode	3
Wipers Operate At Low Speed When In HIGH Speed Position	4
Wipers Run In High Speed, Low Speed Inoperative	5
Wipers Do Not Turn Off	6
Wipers Do Not Run In Delay Position	7

SYMPTOM INDEX

TEST 1: WASHER INOPERATIVE, WIPERS OPERATE

Disconnect washer motor connector. Connect self-powered test light between ground and washer motor connector terminal "B" (Black wire). If test light is on, go to next step. If test light is off, repair open Black wire between washer pump motor and ground. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system).
Disconnect wiper motor connector. Connect self-powered test light between ground and washer motor connector terminal "A" (Red wire). If test light is off, go to next step. If test light is on, repair short to ground in Red wire between wiper motor connector terminal "E" and washer motor connector terminal "A". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system).
Connect self-powered test light between washer motor connector terminal "A" (Red wire) and wiper motor connector terminal "E" (Red wire). (Scheme 1) If test light is on, go to next step. If test light is off, repair open Red wire between wiper motor connector terminal "E" and washer motor connector terminal "A". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system).
Reconnect wiper motor connector. Turn ignition switch to RUN position. Connect test light between ground and washer motor connector terminal "A" (Red wire). Push and hold washer switch on multifunction lever. Observe test light, then release switch. If test light is off, go to next step. If test light is on, replace washer motor. See «WASHER RESERVOIR & PUMP»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system) under REMOVAL & INSTALLATION.
Ensure wiper switch is off. Disconnect wiper motor connector. Connect a voltmeter between ground and wiper motor connector terminal "C" (Purple wire). (Scheme 1) Push and hold washer switch on multifunction lever while observing voltage reading. Release washer switch. If voltage exists with washer switch depressed, go to next step. If voltage does not exist with washer switch depressed, replace wiper/washer switch.
Connect a voltmeter between ground and wiper motor connector terminal "D" (Brown wire). (Scheme 1) Push and hold washer switch on multifunction lever while observing voltage reading. Release washer switch. If voltage exists with washer switch depressed, replace wiper motor. See «WIPER MOTOR»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system) under REMOVAL & INSTALLATION. If voltage does not exist with washer switch depressed, replace wiper/washer switch.

Scheme 1

TEST 2: WASHER PUMPS CONTINUOUSLY

Disconnect wiper motor connector. Turn ignition switch to RUN position. Connect test light between ground and wiper motor connector terminal "E" (Red wire). (Scheme 1) If test light is off, replace wiper motor. See WIPER MOTOR under REMOVAL & INSTALLATION. If test light is on, repair short to voltage in Red wire between wiper motor connector terminal "E" and washer motor connector terminal "A". See WIRING DIAGRAMS.

TEST 3: WIPERS DO NOT RUN IN ANY MODE

Turn ignition switch to RUN position. Using a test light connected to ground, backprobe terminal E4 (Yellow wire) of connector C200 located at base of steering column. (Scheme 2) If test light is on, go to next step. If test light is off, repair open Yellow wire between 25-amp WIPER fuse in instrument panel fuse block and terminal E4 of connector C200 located at base of steering column. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system).
Disconnect connector C200 located at base of steering column. Turn wiper switch to HIGH position. Connect self-powered test light between terminals E4 (Yellow wire) and E3 (Purple wire) of connector C200 (switch side). (Scheme 2) If test light is on, go to next step. If test light is off, repair open Yellow or Purple wire. If wires are okay, replace wiper/washer switch.
Disconnect wiper motor connector. Connect self-powered test light between ground and wiper motor connector terminal "A" (Black wire). (Scheme 1) If test light is on, replace wiper motor. See «WIPER MOTOR»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system) under REMOVAL & INSTALLATION. If test light is off, repair open Black wire between wiper motor connector terminal "A" and ground located behind left kick panel. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system).

Scheme 2

TEST 4: WIPERS OPERATE AT LOW SPEED WHEN SET IN HIGH SPEED POSITION

Disconnect connector C200 located at base of steering column. Connect self-powered test light between connector C200 (switch side) terminals E4 (Yellow wire) and E3 (Purple wire). (Scheme 2) Turn wiper switch to HIGH position. If test light is on, go to next step. If test light is off, check for an open Purple wire between wiper/washer switch and connector C200 terminal E3. If wiring is okay, replace wiper/washer switch.
Reconnect connector C200 at base of steering column. Disconnect wiper motor connector. Connect an un-powered test light between wiper motor connector terminal "C" and ground. (Scheme 1) Turn ignition switch to RUN position. Turn wiper switch to HIGH position. If test light is on, replace wiper motor assembly. See «WIPER MOTOR»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system) under REMOVAL & INSTALLATION. If test light is off, repair open in Purple wire between wiper motor connector terminal "C" and terminal E3 of connector C200. Repair as necessary and recheck system operation.

TEST 5: WIPERS RUN IN HIGH SPEED, LOW SPEED INOPERATIVE

Disconnect wiper motor connector. Turn ignition switch to RUN position. Connect an un-powered test light between ground and wiper motor connector terminal "B" (Yellow wire). (Scheme 1) If test light is on, go to next step. If test light is off, repair open in Yellow wire between wiper motor connector terminal "B", WIPER fuse and terminal E4 of connector C200. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system).
Disconnect connector C200 at base of steering column. Connect a self-powered test light between ground and connector C200 terminal E5. (Scheme 2) If test light is off, go to next step. If test light is on, repair short to ground in Brown wire between terminal E5 of connector C200 and wiper motor connector terminal "D". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system).
Connect a self-powered test light between terminals E5 (Brown wire) and E4 (Yellow wire) of connector C200. (Scheme 2) Turn wiper switch to LOW position. If test light is on, go to next step. If test light is off, check for an open in Brown wire between wiper/washer switch and terminal E5 of connector C200. If Brown wire is not open, replace wiper/washer switch. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system).

TEST 6: WIPERS DO NOT TURN OFF

Turn wiper switch to OFF position. Turn ignition switch to RUN position. Disconnect wiper motor connector. Connect an un-powered test light between ground and wiper motor connector terminal "C" (Purple wire). (Scheme 1) If test light is on, go to step 3. If test light is off, connect un-powered test light between ground and wiper motor connector terminal "D" (Brown wire). (Scheme 1) If test light is on, go to next step. If test light is off, replace wiper motor. See «WIPER MOTOR»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system) under REMOVAL & INSTALLATION.
Disconnect connector C200 at base of steering column. Connect an un-powered test light between ground and terminal E5 (Brown wire) of connector C200. (Scheme 2) If test light is on, repair short to voltage in Brown wire between connector C200 terminal E5 and wiper motor connector terminal "D". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system). If test light is off, check for short to voltage in Brown wire between wiper/washer switch and terminal E5 of connector C200. If Brown wire is not shorted, replace wiper/washer switch.
Disconnect connector C200 at base of steering column. Connect an un-powered test light between ground and connector C200 terminal E3 (Purple wire). (Scheme 2) If test light is on, repair short to voltage in Purple wire between connector C200 terminal E3 and wiper motor connector terminal "C". See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system). If test light is off, check for a short to voltage in Purple wire between wiper/washer switch and connector C200 terminal E3. If Purple wire is not shorted, replace wiper/washer switch.

TEST 7: WIPERS DO NOT RUN IN DELAY POSITION

Disconnect connector C200 at base of steering column. Turn wiper switch to LOW position. Connect a DVOM between terminal E5 (Gray wire) and E4 (Yellow wire) of connector C200. (Scheme 2) Resistance should be approximately 680 ohms. If resistance is as specified, leave DVOM connected and go to next step. If resistance is not as specified, replace wiper/washer switch.
Move wiper/washer switch through delay range until reaching maximum delay position, while observing resistance between terminal E5 (Gray wire) and E4 (Yellow wire) of connector C200. Resistance should be approximately 430 ohms, in maximum delay position. If resistance is as specified, go to next step. If resistance is not as specified, replace wiper/washer switch..
Check for an open in Brown wire between wiper/washer switch and wiper motor cover. See «WIRING DIAGRAMS»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system). If Brown wire is okay, check for an open in Yellow wire between wiper/washer switch and wiper motor cover. Repair as necessary, and retest system. If wiring is okay, replace wiper motor cover. See «WIPER MOTOR COVER»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system) under REMOVAL & INSTALLATION.

Removal

Turn ignition to ACCESSORY position. Turn wiper switch to PULSE position. Turn ignition off when wipers stop at innerwipe position. Remove washer fluid hose elbow from air inlet screen. Remove nut cover and nut from wiper arm. Remove wiper arm assembly from wiper drive system module. Remove wiper arm assemblies from vehicle (use battery puller if necessary).

Installation

Note. Left and right wiper arm assemblies do not interchange from side to side. Wiper arms are stamped LH and RH for reference.

Turn ignition to ACCESSORY position. Turn wiper switch to PULSE position. Turn ignition off when wipers stop at innerwipe position. Install wiper arms with blades on wiper drive. While holding a measuring device perpendicular to windshield, measure between air inlet screen and wiper blade assembly.
Measurement should be 2.76" (70 mm) for driver's side wiper and 2.56" (65 mm) for passenger's side wiper. Adjust distance as necessary. Install nut on wiper arm and tighten to 19 ft. lbs. (26 N.m). Install nut cover and washer fluid hose elbow. Ensure wipers operate correctly.

Remove wiper arms. See WIPER ARM . Remove air inlet screen, located forward of windshield. Disconnect electrical connector from wiper motor. Remove 4 bolts and wiper drive system module from vehicle.

To install, reverse removal procedure. Tighten module bolts to 71 INCH lbs. (8 N.m). Ensure wipers operate correctly.

Removal & Installation

Remove wiper drive system module. See «WIPER DRIVE SYSTEM MODULE»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system) . Remove drive link from wiper motor crank arm using Remover (J39232). Remove 2 bolts and wiper motor from wiper drive system module.
Install wiper motor assembly onto wiper drive system module. Tighten bolts to 71 INCH lbs. (8 N.m). Install drive link onto wiper motor crank arm. Install wiper drive system module onto vehicle. See «WIPER DRIVE SYSTEM MODULE»(/gmc/savana/i-1996-2002/remont/wiperwasher-systems/#wiper-system-and-washer-system) . Check to ensure correct wiper operation.

Note. It is not necessary to remove wiper motor to remove circuit board and terminal assembly.

Remove wiper arms. See WIPER ARM . Remove air inlet screen, located forward of windshield. Disconnect electrical connector from wiper motor. Remove wiper motor cover assembly screws and wiper motor cover assembly from wiper motor. To install, reverse removal procedure. Tighten wiper motor cover screws to 22 INCH lbs. (2.5 N.m). Check to ensure correct wiper operation.

WIPER SWITCH