Wiper/washer System (rwd) Cadillac Brougham I

DESCRIPTION

Models may be equipped with either the standard type system or the multiplex pulse wiper system. The standard system has 2 speeds for wiper operation. A single or steady wiping action can be obtained. On this system the electrical wiring for the motor and gearbox are internally routed through motor casting.

On the multiplex pulse wiper system, the speed of the wiping action can be controlled. With wiper switch in "DELAY" mode, knob can be turned from "MIN" (minimum) to "MAX" (maximum) position to vary the amount of delay between the wiping operation. Delay ranges from zero to 12 seconds depending on position of knob. "MIN" delay or zero seconds between wipes provides equivalent of "LO" (low) speed continuous operation. This system can be identified by a single exposed Black/Pink wire to the timing circuit. (Scheme 1)

Scheme 1

STANDARD SYSTEM

Standard systems consists of 2 speeds, either high or low. When washer button is depressed, wiper motor operates and drives the washer pump to deliver washer fluid to windshield as long as switch is depressed.

MULTIPLEX PULSE SYSTEM

The motor operation is controlled by the dash switch consisting of a combination of switches and a variable resistor. The parking and pulse relays are used for motor operation.

A timing circuit consisting of a capacitor, variable resistor and integrated circuit board are used to control the time that the pulse wiper operation exists. The washer system requires the use of 3 relays and a integrated circuit board containing resistors and capacitors for the operation of the piston type water pump.

Brougham

1. For left wiper arm adjustment, open hood and remove wiper arms. Loosen and raise left side of cowl vent screen. Loosen wiper transmission link-to-crank arm bolts. DO NOT remove bolts. Refer to Fig. (Scheme 12).
2. Rotate right wiper arm so it is positioned 3/4" below ramp stops. Tighten wiper transmission link-to-crank arm bolts to 36-48 INCH lbs. (4-5 N.m).
3. Install left wiper arm on transmission spindle splines. Raise wiper arm slightly and slide lock to retain wiper arm. Position wiper blade on ramp stop on vent screen.
4. Place right wiper arm against ramp stop. Force wiper arm downward on transmission spindle splines. Raise wiper arm slightly and slide lock to retain wiper arm. Operate wipers and note cleaning pattern. The pattern at top of wiper blade should be 1.37" (34.7 mm) from the edge of windshield at the paint line and upper wiper blade overlap should be 1" (25 mm). NOTE: Wiper patterns should be checked with a wet windshield and operating on low speed.
5. For right wiper arm adjustment, disengage wiper arm from transmission spindle splines. Reposition wiper arm on transmission spindle splines to obtain correct pattern. Install cowl vent screen.

All Others

1. Remove right wiper arm. Loosen wiper transmission link-to-crank arm nuts. DO NOT remove nuts. (Scheme 12) Position left wiper arm slightly below stops.
2. Tighten wiper transmission link-to-crank arm nuts 66 INCH lbs. (7 N.m). Place right wiper arm slightly below stop and install wiper arm on transmission spindle splines. Lift wiper blades above stops.
3. Operate wipers and note cleaning pattern. The pattern at top of driver's wiper blade should be approximately.687" (17.44 mm) from edge of pattern to outer edge of the windshield. In the parked position, there should be.234" (5.94 mm) from edge of wiper blade to edge of windshield.

Note. Wiper patterns should be checked with a wet windshield and operating on low speed.

ARMATURE END PLAY

Loosen adjusting screw lock nut. (Scheme 2) Adjusting screw should be rotated until adjusting screw just contacts the armature. Back off adjusting screw 1/4 turn and tighten lock nut.

Scheme 2

DRIVE GEAR ASSEMBLY END PLAY

End play should not exceed.005" (.13 mm) on Brougham models or be.004"±.002" (.10 ±.05 mm) on all other models. Install proper shim washers to obtain correct end play. (Scheme 12)

ON-VEHICLE

Note. Ignition switch must be on while performing all electrical tests. Determine wiper motor terminal identification. (Scheme 3)and (Scheme 4).

Wiper Inoperative Or Intermittent

Check for open in wire from wiper terminal No. 1 to wiper switch and wiper switch operation. See WIPER SWITCH & HARNESS under TESTING in this article. Check for loose wiper switch mounting. Ensure spray nozzle is not contacting wiper blade.

Scheme 3

Will Not Shut Off (Blades Make Full Wiper Stroke)

Check for defective wiper switch. See WIPER SWITCH & HARNESS under TESTING in this article. Check for grounded lead wire from wiper terminal No. 1 to wiper switch. Ensure wiper terminals are not corroded.

Wipers Will Not Shut Off (Blades Move Up And Down Approximately 15 Degrees From Park Position)

Check for open in wire from wiper terminal No. 3 to wiper switch and wiper switch operation. See WIPER SWITCH & HARNESS under TESTING in this article. Check switch for loose mounting.

Wiper Operates At High Speed Only

Check for open in wire from wiper terminal No. 3 to wiper switch and wiper switch operation. See WIPER SWITCH & HARNESS under TESTING in this article.

Wiper Operates At Low Speed Only

Check for grounded wire from wiper terminal No. 3 to wiper switch and wiper switch operation. See WIPER SWITCH & HARNESS under TESTING in this article.

Wiper Shuts Off With Blades Stopping In Wipe Area

Check for improper crank arm, crank arm rotated 180 degrees or defective crank arm-to-linkage adjustment. See WIPER ARMS under ADJUSTMENTS in this article.

OFF-VEHICLE

Note. Check that wiper has low and high speeds and shuts off correctly.

Wiper Inoperative (Motor Does Not Run)

1. Check for open in relay switch coil, circuit breaker, armature, or the motor field. Ensure brushes are not binding.
2. Check for loose or defective solder joints at relay switch. Check for binding of relay switch latch arm or bent relay switch contact.

Wiper Won't Shut Off (Crank Arm Rotates 390 Degrees)

Check for grounded relay switch coil. Check for faulty or disconnected relay switch latch arm spring. Ensure relay switch latch arm is not binding and proper gap exists.

Wiper Will Not Shut Off (Accompanied By A Loud Knock)

Check for shorted switch contacts or disconnected drive pawl spring. Check for open shunt field, causing wiper to have high speed only.

Wiper Has High Speed Only

Check for open shunt field, loose or defective solder joints at No. 3 terminal of relay switch and terminal board.

Wiper Has Low Speed Only

Check for internally grounded shunt field, grounded terminal board or shorted armature. Ensure shunt field lead to the relay switch is not grounded.

Wiper Has Excessive Speed In High (Low Speed Normal)

Check for open circuit in 20-ohm resistor or poor resistor ground connection.

Wiper Stops At Random W/No Return To Park Position

Check for dirty of defective relay switch contacts.

Intermittent Operation

Check for defective or weak circuit breaker or sticking brushes. Check for circuit breaker tripping caused by shorted armature and/or shorted fields causing excessive motor draw. Check for sticking brushes.

No Apparent Trouble On Bench Test But Fails Occasionally On Vehicle

Check for tight armature or drive gear assembly end play. Ensure no loose or defective solder joints exist. Ensure wiper switch mounting is tight.

MULTIPLEX PULSE WIPER SYSTEM

Note. Ignition switch must be on while performing all electrical tests. Determine wiper motor terminal identification. (Scheme 4)

Scheme 4

Scheme 5

1. Ensure wiper switch is in "OFF" position. With ignition switch on, check for voltage at wiper motor terminal No. 2. Refer to Fig. (Scheme 4). If no voltage exists, check for blown fuse. If fuse is okay, check for open circuit between fuse block and wiper motor. If fuse was blown, replace fuse.
2. If fuse blows again, check wiper motor for high amperage draw or short in wire to terminals No. 2 and 5. (Scheme 4) If voltage exists, touch test light probe to wiper terminal No. 1. (Scheme 4) If wipers operate, check for open circuit in wire between terminal No. 1 and wiper switch or for defective wiper switch.
3. If wipers fail to operate, place wiper switch in the "LOW" position. Touch probe to terminal No. 6. (Scheme 4) If wipers operate, check for open circuit in wire between terminal No. 6 and wiper switch or defective wiper switch.
4. If wiper fails to operate, disconnect wiring connector and remove washer pump cover. Reinstall wiring connector. Place wiper switch in the "LOW" position. Ground test light and check for voltage at the Red wire at pulse relay. (Scheme 5)
5. If no voltage exists, check connection to wiper terminal No. 1 or for open in Red wire to pulse relay. Replace park relay if connections are okay and no open exists.
6. If voltage exists, ground test light and touch probe to Orange wire terminal at pulse relay. If wiper operates, replace timing circuit board assembly.
7. If wiper does not operate, check for voltage at Pink/Black wire terminal of the pulse relay. Replace pulse relay if no voltage exists. If voltage exists, repair or replace wiper motor.

Scheme 6

Scheme 7

1. In delay mode and wiper do not delay between wipes, proceed to step 3). If wipers delay, turn ignition on. Place wiper switch in the "OFF" position. Remove wiper motor wiring connector.
2. Connect test light between terminals No. 1 and 2 of wiring connector. (Scheme 6) If no voltage exists, remove washer pump assembly. Check park relay spring. If spring is okay, replace park relay. If voltage exists, check for grounded wire between wiper switch and terminal No. 1, or defective wiper switch. See, under TESTING in this article, «WIPER SWITCH & HARNESS»(/cadillac/brougham/i-1987-1992/remont/wiperwasher-systems/#wiperwasher-system-rwd__wiper-switch-harness).
3. Place wiper switch in the "OFF" position. Turn ignition off and then on. If wipers do not shut off, check that override switch contacts are opened by projection on rim of ratchet gear. (Scheme 7)
4. If contacts are open, check for grounded Blue wire. If contacts are closed, check for loose timing circuit screw. If okay, adjust contacts or replace timing circuit assembly.
5. If wipers shut off with blades properly positioned, check holding switch contacts. (Scheme 8) Adjust contacts as necessary. Replace timing circuit assembly if holding switch contacts are okay.

Scheme 8

Wiper Has Low Speed Only (Operates Okay in Delay Mode & Shuts Off Correctly)

1) Turn ignition on. Place wiper switch in the "HIGH" speed position. Remove wiper motor wiring connector. Note connector terminal identification. (Scheme 6) Connect test light between terminals No. 2 and 3 and check for voltage.

2) If no voltage exists, wiper motor must be repaired. Check for ground in shunt field. If voltage exists, check for grounded wire of No. 3 terminal and wiper switch. If no ground exists, check for defective wiper switch. See WIPER SWITCH & HARNESS under TESTING in this article.

Wiper Has High Speed Only (Will Not Delay Between Wipes)

1. Note wiper motor wiring connector terminal identification. (Scheme 6) Check for proper contact at No. 3 terminal of wiper motor connector. If connection is okay, install a jumper wire from terminal No. 3 to ground with wiring wiper motor connector installed. If condition still exists, remove motor and check shunt field for an open circuit.
2. If low speed now exists and then shuts off, check wire between terminal No. 3 and switch for an open. If no open exists, check for defective wiper switch. See «WIPER SWITCH & HARNESS»(/cadillac/brougham/i-1987-1992/remont/wiperwasher-systems/#wiperwasher-system-rwd__wiper-switch-harness) under TESTING in this article.

Blades Cycle In And Out Of Park Position (When Wiper Is Shut Off)

1) Note wiper motor wiring connector terminal identification. (Scheme 6) If wiper has high speed only, check for proper contact at No. 3 terminal of wiper motor connector. If connection is okay, proceed to step 2). If wiper has high and low speeds, replace park relay.

2) If connection is okay, install a jumper wire from terminal No. 3 to ground with wiper motor wiring connector installed. If condition still exists, remove motor and check for open in shunt field.

3) If low speed now exists and then shuts off, check wire between terminal No. 3 and switch for an open. If no open exists, check for defective wiper switch. See WIPER SWITCH & HARNESS under TESTING in this article.

Wipers Run Continuously In Delay Mode (No Delay Between Wipes)

1) Turn ignition on and operate wipers at low and high speeds. Ensure wipers shut off correctly. If wipers operate in high speed only or will not shut off, proceed to appropriate test.

2) If wipers operate properly, but do not delay between wipes, operate wipers in the mid-delay position. Disconnect lead from the No. 6 terminal. (Scheme 4) If wipers continue to operate, proceed to step 3). If wipers stop, proceed to step 4).

3) Disconnect wiring connector and remove washer pump cover. Reinstall wiring connector. Operate wipers continuously in the delay mode and disconnect lead to timing circuit from pulse relay. Replace timing circuit assembly if wipers stop. Replace pulse relay if wipers continue to operate.

4) If wipers stop, check for grounded circuit between terminal No. 6 and wiper switch. If okay, replace wiper switch.

Wipers Inoperative In Delay Mode (Wipers Function Only In Low Or High Speed)

1) Disconnect washer pump relay wiring connector with wiper switch in mid-delay. (Scheme 4) Using an ohmmeter, connect one ohmmeter lead to the No. 6 terminal wire of the connector and the other lead to ground. (Scheme 6)

2) Adjust ohmmeter to the "Megohm" scale and check for resistance. Replace wiper switch if no resistance exists. Replace timing circuit assembly if resistance exists.

Intermittent Wiper Operation (Blades Stop At Random Positions With Wiper Switch In Low Or High Positions)

1) Remove wiper fuse. Install a 0-30 ammeter across fuse block terminals. Operate wipers in low speed and note the lowest current draw (current draw will fluctuate).

2) If lowest current draw exceeds 6.5 amps, proceed to step 3). If lowest current draw is 5-6.5 amps, repair wiper motor by replacing brush plate and circuit breaker assembly.

3) Replace wiper blade elements and repeat test. If lowest current draw still exceeds 6.5 amps, disconnect wiper linkage for wiper motor and repeat test. If current draw is okay, repair or replace binding wiper transmission linkage. Replace wiper motor if current draw still exceeds 6.5 amps.

Wiper Inoperative

1. Remove washer pump to gain access to relay switch and terminal board assembly. Using jumper wire, connect 12-volt power source to No. 2 terminal of wiper motor. (Scheme 3) Connect jumper wire from wiper motor housing to ground. DO NOT connect jumper to terminal No. 1 and terminal No. 3.
2. To determine if relay switch coil is open, connect test light to wiper terminal No. 1. (Scheme 3) Voltage should exist. Also test relay switch.

Relay Switch Test

1. If gear mechanism is in full-park position, install a small screwdriver into switch slot between drive pawl and latch arm. Push latch arm downward and toward relay switch coil in direction of arrow. (Scheme 3)
2. Remove washer pump assembly. Using test light, check for voltage at Black/Pink wire. If voltage exists, but motor does not operate, proceed to step 3). If voltage does not exist, relay switch and terminal board are defective.
3. Disassemble motor section. Check for binding brushes, defective solder connections at brush holders, defective splice joints at field coil, open armature, defective circuit breaker ground connection on field lamination. Check for dirty or defective circuit breaker contacts or loose connections at circuit breaker terminals.

Wiper Will Not Shut Off (Crank Arm Rotates 360 Degrees)

1. Ensure latch arm spring is properly connected. Manually operate latch arm and check for binding. (Scheme 3)
2. Using jumper wire, connect 12-volt power source to the No. 2 terminal of wiper motor. (Scheme 3) Connect jumper wire from terminal No. 3 to wiper motor housing. DO NOT make any connections from terminal No. 1.
3. Wiper motor should start to operate when connections are made. If motor operates and continues to run, relay switch and terminal board assembly must be replaced as the coil is internally grounded.

Wiper Will Not Shut Off (Recycles)

1. Crank arm oscillates in a horizontal plane and a loud knock is heard with each revolution of gear. Ensure drive pawl and latch arm springs are connected properly.
2. Check wiper for low speed operation. Using jumper wire, connect 12-volt power source to No. 2 terminal of wiper motor. (Scheme 3) Connect jumper wire from terminal No. 1 to terminal No. 3 and to wiper motor housing.
3. If no low speed exists and only has high speed, check for defective connections at terminal No. 3, field coil crossover splice or Black lead to field coil.
4. To check relay switch and terminal, remove washer pump assembly to gain access to Black/Pink wire. Connect positive side of power source to terminal No. 2. (Scheme 3) Connect ground wire to wiper motor housing. Install jumper wire from terminal No. 1 to wiper motor housing.
5. Using test light, check for voltage at the Black/Pink wire. Note if test light shows constant voltage or if light goes out once for each revolution of the gear.
6. If constant voltage exists, relay switch contacts are not opening and switch is defective. Relay switch is good if light went out each time drive pawl moves into relay switch slot.

Wiper Has Only Low Speed

Check for grounded area in Black lead to No. 3 terminal. (Scheme 3) Disassemble motor section of wiper and check for grounded shunt field coil.

Excessive Speed In High (But Low Speed Is Normal)

Check for open circuit in 20-ohm resistor.

1. Check for loose connections at relay switch and terminal board. Check wiper for low speed operation. Using jumper wire, connect 12-volt power source to the No. 2 terminal of wiper motor. (Scheme 3) Connect jumper wire from terminal No. 1 to terminal No. 3 and to wiper motor housing.
2. Connect a 0-30 amp ammeter in power wire to wiper motor. Operate motor and note current draw. Motor should operate until the motor is hot. If current draw is less than 4 amps on low speed and wiper cycles on and off, the circuit breaker is defective. Replace brush plate assembly. If current draw exceeds 4 amps, adjust armature end play and recheck current draw. See «ARMATURE END PLAY»(/cadillac/brougham/i-1987-1992/remont/wiperwasher-systems/#wiperwasher-system-rwd__armature-end-play) under ADJUSTMENTS in this article.
3. Adjust drive gear assembly end play. See, under ADJUSTMENTS in this article, «DRIVE GEAR ASSEMBLY END PLAY»(/cadillac/brougham/i-1987-1992/remont/wiperwasher-systems/#wiperwasher-system-rwd__drive-gear-assembly-end-play). Check current draw. If excessive current draw still exists, disassemble wiper motor and checked for grounded armature.

Scheme 9

1. With ignition on, remove washer pump relay wiring connector from washer pump terminals No. 4 and 5. (Scheme 4) Using test light, check for voltage at terminals No. 4 and 5. (Scheme 6) If no voltage exists at both terminals, check for open in feed circuit to washer relay from No. 2 terminal of wiper motor connector.
2. If voltage exists, connect test light between terminals No. 4 and 5 and push the wash button. If no voltage exists, check for open in wire to wiper switch or a defective switch.
3. If voltage exists, reconnect wiring to terminals No. 4 and 5. Using test light, check voltage at terminals No. 4 and 5. Replace washer relay if no voltage exists on one terminal.
4. If voltage exists on both terminals, disconnect wiring connector and remove washer pump cover. Reconnect wiring and operate wipers in low speed. Observe movement of ratchet pawl. (Scheme 9) If ratchet pawl fails to move, check for binding of cam-follower pin. Replace washer pump if binding exists.
5. If ratchet pawl moves back and forth, depress washer button. Note if ratchet gear rotates. Replace valve assembly if ratchet gear rotates. If problem still exists, replace piston and pump housing assembly. If ratchet gear failed to rotate, check for missing or improperly connected ratchet pawl spring or ratchet dog spring not engaging ratchet gear teeth. (Scheme 9)

Windshield Washer Will Not Shut Off

1. With ignition on, remove washer pump relay wiring connector from washer pump. (Scheme 4) Using test light, check for voltage at terminals No. 4 and 5. (Scheme 6) If voltage exists, check for grounded wire between washer connector and wiper switch or a defective wiper switch.
2. If no voltage exists, disconnect wiring and remove washer pump cover. Reconnect wiring to wiper terminals to re-establish condition. Note location of relay armature leg. If relay armature leg is on the ramp, check that ratchet dog spring engages with ratchet gear teeth. Check for excessive wear on ratchet gear teeth and ratchet pawl spring missing or not properly connected. (Scheme 10)
3. If relay armature leg is on rim slot area, check for loose pole piece on washer relay or burr on relay armature leg. (Scheme 10)

Scheme 10

Washer Squirts Twice & Wipers Shut Off

Check that override switch contacts are clean and properly closing when wash cycle is started. (Scheme 7) Clean or adjust as necessary.

Wipers Remain In Delay Mode (When Washer Is Started From Delay Mode)

Check that override switch contacts are clean and properly closing when wash cycle is started. (Scheme 7) Clean or adjust as necessary.

Washers Inoperative

1. Check for following: Inadequate fluid supply, damaged or kinked hoses, restricted screen at reservoir hose, loose electrical connections to washer pump or wiper switch and open circuit in feed wire to ratchet relay coil.
2. Check for defective wiper switch or ratchet relay coil, plugged washer nozzle, missing ratchet gear teeth or ratchet pawl spring. Check for defective pump valve assembly or stuck cam-follower pin arm.

Washer Pumps Continuously (W/Wipers Operating)

Check for grounded wire from ratchet relay to wiper switch. Check for defective wiper switch, missing ratchet gear teeth, missing or weak spring tooth or broken ratchet wheel dog or no contact with ratchet gear teeth. Ensure lock-out tang is not broken or bent on piston actuator plate.

WIPER SWITCH & HARNESS

1. Check for proper wiring connections at relay switch, terminal board and wiper switch. Ensure wiper motor retaining bolts are tight and wiper switch is securely mounted.
2. Remove wiper motor connector. With ignition on, use test light and check for voltage at No. 2 terminal of switch harness. (Scheme 6) If no voltage exists, check for defective power supply.
3. To check remaining terminals, connect test light to a 12-volt power supply and probe the 2 outside terminals. Place wiper switch in the "LOW" position. Check that voltage exists at either outside terminal.
4. Place wiper switch to the "HIGH" position. Voltage should exist at one outside terminal only. With wiper switch in the "OFF" position, voltage should exist at the opposite outside terminal only. Check relay wiper switch if wiper switch and harness are okay.

RELAY WIPER SWITCH

Ensure wiper motor is well grounded. Connect jumper wire from battery source to Black/Pink wire of wiper motor. If wiper motor now operates, and not when wiper switch is used, the relay switch is defective. Wiper motor is defective if motor fails to operate.

Removal

1. Raise hood. Remove wiper blade arms. Remove lower windshield reveal molding and cowl vent screen. Place large screwdriver between drive link and crank arm. Twist to disengage link retainer.
2. Remove transmission-to-body bolts. Remove transmission and linkage assembly by guiding it through chamber opening.

Installation

To install, reverse removal procedure. Install wiper arm assemblies and adjust wiper arms. See WIPER ARMS under ADJUSTMENTS in this article. Check wiper operation, wiper pattern and park position.

Removal & Installation

1. To remove, position wiper arms in vertical position and disconnect negative battery cable. Disconnect wiper motor and washer relay wires.
2. Remove washer pump cover. Remove pulse relay and timing circuit board retaining screw. Disconnect motor leads from relay terminals and remove timing circuit. To install, reverse removal procedure.

1. Remove washer pump from gearbox. See, under REMOVAL & INSTALLATION, appropriate WASHER PUMP article. Note if drive pawl is in full-park position. (Scheme 11) If drive pawl is in full-park position, wiper motor must be operated to move pawl out of relay slot.
2. Connect battery voltage to No. 2 terminal of wiper motor. (Scheme 3)and (Scheme 4). Connect jumper wire from terminal No. 1 to wiper motor housing.
3. This will operate motor on the low speed. Operate until wiper gear drive pawl is moved out of the relay slot. If motor will not operate, remove gear mechanism.
4. Remove relay screw and remove terminal board assembly from gearbox. Unsolder Black lead from relay terminal and remove terminal board.

To install, reverse removal procedure. Operate wiper to park position and install washer pump. During relay installation in gearbox, ensure wiring leads are not pinched between relay and housing.

Scheme 11

1. With wiper motor gearbox removed, place crank arm in vise. Remove crank arm retaining nut, crank arm, rubber seal cap, retaining ring, shim washers, shield and spacer washer. (Scheme 12)
2. Remove drive gear assembly from wiper motor housing. If relay switch terminal board assembly has not been removed, position relay latch arm out of the way.
3. Slide drive plate and shaft assembly out of gear and tube. (Scheme 13) Remove drive pawl, lock pawl and coil spring. Retain inside spacer washer for reassembly.

Scheme 12

Scheme 13

Note. Replacement drive plate and shaft assembly contain 2 retaining ring grooves. Service part instructions will indicate proper groove usage.

1. Position drive and lock pawls in drive plate. Install drive gear and tube over drive plate shaft. Move drive and lock pawls to pins to engage in the drive gear guide channel.
2. Hold drive gear and rotate drive plate in proper direction until drive and lock pawl pins engage into drive gear pockets. (Scheme 13) Install pawl spring.
3. Install inner spacer washer over drive gear tube. Reassemble drive gear mechanism in gearbox. Ensure drive gear assembly does not come apart during installation.
4. Install spacer washer, shield, shim washers and retaining ring. Note drive gear assembly end play. End play should not exceed.005" (.13 mm) on Brougham models or be.004"±.002" (.10±.05 mm) on all other models. Install proper shim washers to obtain correct end play. (Scheme 12)
5. Connect battery voltage to No. 2 terminal of wiper motor. (Scheme 3)and (Scheme 4). Connect jumper wire from terminal No. 3 to wiper motor housing. Operate motor to park position. Install crank arm on shaft in proper direction. (Scheme 12)
6. Install crank arm retaining nut and tighten to 25 ft. lbs. (34 N.m). Install washer pump to gearbox.

1. Place mark on motor case for reassembly reference. Remove motor through bolts. Pull motor wiring through casting grommet.
2. Move motor end case with field assembly and armature backward until armature clears the bearing. It may be necessary to remove armature end play adjusting screw and insert a rod through opening to apply pressure against end of armature. (Scheme 2)
3. Note all wire routing. Unsolder Black lead from circuit breaker. Straighten out brush plate-to-field coil bracket retaining tabs. Install "U" shaped brush retainer clip over brush holder containing the brush lead attached to circuit breaker.
4. Hold remaining brush outward and lift brush holder upward far enough to clear armature commutator. Allow brush to move outward and remove brush spring. Remove brush holder from armature.

1. Position partially assembled brush plate over armature far enough for installation of remaining brush in brush holder. Install brush holder over mounting tabs.
2. Ensure brush holder is centered and bend tabs toward brush holder. DO NOT bend or distort metal brush holders. Remove brush retainer clips. Resolder circuit breaker ground lead to circuit breaker.

1. To remove, remove brush plate and circuit breaker as previously described. Lift armature from motor case and field assembly. Remove thrust ball from end of armature.
2. To install, reverse removal procedure. Lubricate bearing end of armature with Multipurpose (EP-1) grease prior to installation. Install armature in motor case. Start armature shaft through case bearing until it begins to mesh with drive gear teeth.
3. Pull excess wire leads through the grommet. Rotate armature slightly to align armature with drive gear teeth and install. Install brush assembly.

1. Remove brush plate and armature as previously described. End case and field assembly is serviced as a unit. Cut the field wire in convenient area for splicing.
2. Remove felt lubricating washer, steel thrust plate and rubber disc from case bearing.

To install, reverse removal procedure. Ensure wires are spliced back in correct location.

Disconnect hoses from washer pump and wiring from pump relay. Remove washer pump cover. Remove washer pump-to-gearbox retaining bolts and remove washer pump.

Note. Ensure sure gearbox is in park position prior to installing washer pump. (Scheme 11)

1. Wiper motor must be in the park position prior to installing washer pump. (Scheme 11) Rotate cam lobe until index hole in cam is aligned with mounting plate. Install locator pin through pump cover and into hole of cam. (Scheme 11)
2. Install washer pump on wiper motor so drive pin slot of cam lobe aligns over drive pin. (Scheme 11) Install washer pump bolts. Remove locator pin and install wiring connector. Check operation. If knocking noise is heard, this indicates cam is not properly engaged. Install pump cover.

Scheme 14

1. Remove washer cover. Disconnect Green wire. (Scheme 14) Disconnect Yellow and Red wires from pulse relay terminals. Unsolder Black/Pink wire from remaining relay terminal. (Scheme 14)
2. If only pump assembly is being removed with wiper motor on the vehicle, cut Black/Pink wire 4" (102 mm) from motor grommet. Depending on repair required, it may be necessary to splice this lead to replacement lead or to original relay lead after pump is installed. Remove pump-to-gearbox retaining screws and remove washer pump.

Note. Ensure gearbox is in park position prior to installing washer pump. (Scheme 11)

Install locator pin in pump assembly while rotating cam counterclockwise. (Scheme 11) Install pump on gearbox and install retaining screws. Remove locator pin. Reconnect electrical leads. Install washer cover. Reinstall wiper in vehicle (if removed).

WIRING DIAGRAMS

For wiring diagrams, refer to appropriate chassis wiring in WIRING DIAGRAMS section.

See also:
• WIPER SWITCH & HARNESS
• WIPER ARMS
• ARMATURE END PLAY
• DRIVE GEAR ASSEMBLY END PLAY