Wiper/washer System - Front Chevrolet Caprice IV

DESCRIPTION

The windshield wiper/washer system uses a permanent magnet depressed park wiper motor assembly, a linkage assembly, wiper arm and blade assemblies, a washer pump mounted on a fluid reservoir and a wiper/washer switch assembly. System is designed to deliver pulse timing and demand wash functions electronically. Depending on control switch design and whether an integral electronic printed circuit board is used in wiper cover, system can function as either a pulse or standard wiper/washer system.

OPERATION

Electronic logic circuits in pulse wiper system's printed circuit board create timing and washer commands. Whenever WASH switch is activated for less than one second, washer solvent is sprayed on windshield for approximately 2.5 seconds and wiper cycle is activated for approximately 6 seconds.

If WASH switch is held for more than one second, a demand wash will be performed for as long as switch is held. This wash cycle is followed by 6-second wiper cycle. When control switch is in LO or HI position, applicable circuit is completed to power source, and motor runs at set speed.

Switching control to DELAY mode operates wiper motor intermittently. Delay can be varied by adjusting switch back and forth within delay mode. An instant wipe is caused by positioning switch in MIST selection (if equipped). Wiping action continues until switch is released.

WIPER ARM

Note. Check wiper arm wiping pattern on wet windshield.

1. Place wipers in PARK position. Disconnect washer fluid hose. Remove protective cap. Lift wiper arm and insert pin or pop rivet through holes located next to pivot of arm. Remove nut. Remove wiper arm from drive shaft. (Scheme 1)
2. Position wiper arm 1" (25 mm) below park ramp. Remove pin or pop rivet from hole. Tighten adjusting nuts to 22.5 ft. lbs. (30.5 N.m.). Outwipe should be 1-1.5" (25-38 mm) from edge of glass. Install protective cap and washer fluid hose.

Scheme 1

TESTING

Before performing following tests, ensure wiper motor module-to-dash mounting hardware is secure, washer hoses are not kinked, disconnected or broken, and circuit harness wiring and circuit fuses are okay.

Note. For terminal and connector reference during wiper tests (Scheme 2)or (Scheme 3), or see WIRING DIAGRAMS.

Scheme 2

Scheme 3

WIPER MOTOR TEST

1. Check motor operation before removing wiper assembly from vehicle. Disconnect wiring harness from wiper assembly. Apply a 12-volt source to wiper connector pins. (Scheme 4)-8.
2. If wiper motor runs in all operating modes (LO, HI, PARK and DELAY), perform voltage and continuity wiper switch tests. (Scheme 9) If wiper motor does not run in any or all operating modes, perform appropriate tests.

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

WIPERS DO NOT OPERATE IN ANY MODE TEST

1. Disconnect wiper/washer switch connector. Turn ignition switch to RUN position. Connect a test light between wiper/washer switch connector terminal "B" and ground. If test light is on, go to next step. If test light is off, check for open in fuse No. 10 or circuit No. 93 (White wire). If fuse and circuit are okay, check for open power feed circuit No. 4 (Brown wire).
2. Disconnect wiper motor module connector C2. Connect a test light between connector C2 terminal "C" and battery voltage. If test light is on, go to next step. If test light is off, check for open ground circuit No. 150 (Black wire).
3. Reconnect wiper/washer switch connector. Disconnect wiper motor module connector C1. Connect a test light between connector C1 terminal "C" and ground. If test light is on, go to next step. If test light is off, check for poor connection at wiper/washer switch connector terminal "D" and for open circuit No. 95 (Dark Green wire). If connections and circuit are okay, replace wiper/washer switch.
4. Turn wiper/washer switch to LO position. Connect a test light between C1 terminal "B" and ground. If test light is on, replace wiper motor module. If test light is off, check for poor connections at wiper/washer switch connector terminal "C" and for open circuit No. 91 (Gray wire). If connection and circuit are okay, replace wiper/washer switch.

WIPERS RUN AT HIGH SPEED ONLY TEST

1. Disconnect wiper motor module connector C1. Turn ignition switch to RUN position. Turn wiper/washer switch to LO position. Connect a test light between connector C1 terminal "B" and ground. If test light is on, go to next step. If test light is off, check for open in circuit No. 91 (Gray wire) or poor connection at wiper/washer switch connector terminal "C". If circuit and connection are okay, replace wiper/washer switch.
2. Connect a test light between connector C1 terminal "C" and ground. If test light is on, go to next step. If test light is off, check for open in circuit No. 95 (Dark Green wire) or poor connection at wiper/washer switch connector terminal "D". If circuit and connection are okay, replace wiper/washer switch.
3. Use an ohmmeter to check for continuity from wiper motor module connector C1 terminal "A" to connector C2 terminal "B". If continuity is found, check for poor connection at wiper motor module connector C1. If connection is okay, replace wiper motor module. If no continuity is found, check for open in circuit No. 196 (Yellow wire).

WIPERS RUN AT LOW SPEED ONLY TEST

1. Disconnect wiper motor module connector C2. Turn ignition switch to RUN position. Turn wiper/washer switch to HI position. Connect a test light between connector C2 terminal "A" and ground. If test light is on, check for poor connection at connector C2 terminal "A." If connection is okay, replace wiper motor module.
2. If test light is off, check for open in circuit No. 92 (Purple wire) or for poor connection at wiper/washer switch connector terminal "E". If circuit and connection are okay, replace wiper/washer switch.

WIPERS WILL NOT SHUT OFF TEST

1. Disconnect wiper motor module connector C1. Turn ignition switch to RUN position. Turn wiper/washer switch to OFF position. Use a digital voltmeter to measure voltage between connector C1 terminal "B" and ground. If voltage is not present, go to next step. If voltage is present, check for short to battery voltage in circuit No. 91 (Gray wire). If circuit is okay, replace wiper/washer switch.
2. Disconnect wiper motor module connector C2. Use a digital volt-meter to measure voltage between connector C2 terminal "A" and ground. If voltage is not present, repair short to battery in circuit No. 196 (Yellow wire). If voltage is present, check for short to battery voltage in circuit No. 92 (Purple wire). If circuit is okay, replace wiper/washer switch.

PULSE DELAY INOPERATIVE OR INCORRECT TEST

1. Turn ignition switch to OFF position. Disconnect wiper/washer switch connector. Turn wiper/washer switch to DELAY position. Use an ohmmeter to measure resistance between terminals "B" and "F" of wiper/washer switch connector. Move wiper/washer switch through entire delay range.
2. If resistance varies between approximately 24 k/ohms and 1224k/ohms, go to next step. If resistance does not vary between these values, replace wiper/washer switch.
3. Connect a test light between wiper/washer switch connector terminal "C" and ground. If test light is on, check circuit No. 94 (Pink wire) for open or poor connection. If connection and circuit are okay, replace wiper motor module. If test light is off, replace wiper/washer switch.

WASHER MOTOR WILL NOT OPERATE TEST

1. Disconnect washer pump connector. Turn ignition switch to RUN position. Connect test light between terminals "A" and "B" of washer pump connector. Activate washer switch while observing test light. If test light is on, check for poor connection at washer motor connector. If connection is okay, replace washer pump. If test light is off, connect test light between terminal "A" and ground. Activate washer switch while observing test light.
2. If test light is on, check for open or poor connection in circuit No. 227 (Dark Blue wire). If connection and circuit are okay, replace wiper motor module. If test light is off, connect test light between terminal "D" and ground. If test light is on, check for poor connection or open in circuit No. 228 (Red wire).
3. If test light is off, use a digital voltmeter to backprobe wiper/washer switch connector between terminal "F" and ground with ignition switch in RUN position. Activate washer switch while observing voltmeter.
4. If voltage is present, check for poor connection at wiper/washer switch connector terminal "F" and wiper motor module connector terminal "F". Also check for open in circuit No. 94 (Pink wire). If connection and circuit are okay, repair or replace wiper motor module. If voltage is not present, replace wiper/washer switch.

REMOVAL & INSTALLATION

Removal

Remove right side wiper arm and hose. To prevent windshield damage, remove left side vent shroud first. Remove right side vent shroud. Remove linkage access hole cover screws and covers. Remove motor drive link from crank arm. Disconnect electrical connectors. Remove wiper motor mounting bolts. Carefully guide crank arm through access hole and remove wiper motor.

Installation

To install, reverse removal procedure. Tighten mounting bolts to 80 INCH lbs. (9 N.m), nuts to 27 INCH lbs. (3 N.m), and access cover screws to 13 INCH lbs. (1.5 N.m).

Remove wiper motor module from vehicle (if necessary). See WIPER MOTOR MODULE . Remove wiper motor cover/module screws. Remove cover. To install, reverse removal procedure. Tighten screws to 18 INCH lbs. (2 N.m).

Remove wiper motor cover/module. See WIPER MOTOR COVER/MODULE. If wiper motor is in PARK position, operate motor to remove lock pawl from relay slot. Remove park switch. To install, reverse removal procedure. (Scheme 10)and (Scheme 11).

Scheme 10

Scheme 11

Raise hood. Remove wiper arm and blade assemblies. To prevent windshield damage, remove left side vent shroud first. Remove right side vent shroud. Remove nozzle hose assembly from washer hose. Remove linkage access hole cover screws and covers. Remove motor drive link from crank arm. Remove linkage-to-body attaching screws. Carefully guide linkage assembly through access hole.

To install, reverse removal procedure. Tighten linkage screws to 71 INCH lbs. (8 N.m), nuts to 27 INCH lbs. (3 N.m), and access cover screws to 13 INCH lbs. (1.5 N.m).

Drain washer reservoir. Remove inner fender panel screws and panel to gain access to motor (if equipped). Remove washer motor electrical connector and hose. Remove reservoir (if necessary). Remove motor from reservoir. To install, reverse removal procedure.

Front Wiper/Washer System Wiring Diagram. Scheme 12

See also:
• WIRING DIAGRAMS