Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
Wiper Motor: Testing and Inspection
Depressed Park Motor W/Remote Washer Pump
On models with pulse wipers, disconnect electrical connectors to pulse module and connect switch and motor harnesses together. If problem is
corrected, pulse module is defective.
Wiper Motor Inoperative
1.
Turn ignition switch on and wiper off, then connect test light lead to ground on vehicle and probe harness terminal No. 3.
2.
If light illuminates, proceed as follows:
a. Connect test light lead to ground at wiper motor case and probe harness terminal No. 3.
b. If light does not illuminate, check both motor ground connections.
c. If light illuminates, place wiper switch in LO position, connect test light lead to ground at wiper motor case and probe harness terminal No. 2.
d. If light does not illuminate, locate and repair open from wiper switch to motor.
e. If light illuminates, check continuity between terminal Nos. 1 and 8.
f.
If there is no continuity, locate and repair open between terminal Nos. 1 and 8 in wiring harness.
g. If there is continuity, check armature, circuit breaker, circuit breaker ground and brushes.
3.
If light does not illuminate, proceed as follows:
a. Check fuse.
b. If fuse is not blown, locate and repair open in circuit from fuse block to wiper motor.
c. If fuse is blown, replace it.
d. If fuse blows again, unplug motor and replace fuse.
e. If fuse blows again, check for grounded condition in wire to terminal No. 3.
f.
If fuse does not blow, check for high amperage at motor. Lowest current draw on dry glass should not exceed 6.5 amps.
g. Move switch to LO position. If fuse does not blow, repeat step f.
h. If fuse blows, check resistance from terminal No. 2 to ground.
i.
If resistance is not 20-25 ohms, replace park switch.
Intermittent Wiper Operation In Pulse, LO Or HI Modes
1.
Remove wiper fuse and connect a 0-30 amp ammeter across fuse block terminals, then operate wiper in LO and observe lowest current draw while
wiper is running on dry glass. (Current draw will fluctuate).
2.
If lowest current draw is less than 3.5 amps, proceed as follows:
a. Check motor grounds.
b. Check brush plate assembly for restricted brush to commutator contact.
c. Check circuit breaker for intermittent open.
d. Check armature for open circuit.
3.
If lowest current draw exceeds 6.5 amps, replace wiper blade elements and repeat test.
4.
If lowest current draw still exceeds 6.5 amps, disconnect wiper linkage from wiper motor crank arm and repeat test.
5.
If lowest current draw is now less than 6.5 amps, replace or repair wiper transmission (linkage) as necessary.
6.
If lowest current draw still exceeds 6.5 amps, replace wiper motor.
Wiper Will Not Park
1.
Turn ignition on and wiper off and probe harness terminal No. 2.
2.
If light illuminates, refer to wiper switch continuity test.
3.
If light does not illuminate, remove wiper cover, reconnect motor without cover, switch motor from LO to OFF and check whether park switch
latch arm is in position to catch drive pawl.
4.
If arm is not in proper position, replace park switch or, on pulse models, the cover assembly.
5.
If arm is in proper position, check whether drive pawl is bent.
6.
If drive pawl is bent, replace it. Otherwise, check shaft endplay. If drive pawl overrides latch, replace shaft assembly.
No Delay Or Continuous In Delay (Motor Operates In LO & HI)
1.
With voltmeter connected to terminal No. 6 and grounded at motor case, vary delay mode from minimum delay time to maximum delay time.
Voltage should vary from maximum to minimum.
2.
If voltage does not vary, refer to wiper switch continuity test.
3.
If voltage varies, turn ignition switch on and set wiper switch on minimum delay, then connect test light lead to ground at wiper motor case and
probe harness terminal No. 2.
4.
If light does not illuminate, refer to wiper switch continuity test.
5.
If light illuminates, remove cover and check whether park switch pulse terminals are touching pads on circuit board. If so, replace cover.
Otherwise, replace spring contacts.
No LO Mode
1.
With wiper switch on LO, connect test light lead to ground at wiper motor case and probe harness terminal No. 2.
2.
If light does not illuminate, locate and repair open from wiper switch to motor.
3.
If light illuminates, probe harness terminal No. 3.
4.
If light does not illuminate, locate and repair open circuit from switch to motor.
5.
If light illuminates, reconnect harness plug to cover and probe harness terminal No. 8.
