Reatta V6-231 3.8L VIN C SFI (1990)
Wiper Motor: Testing and Inspection
Depressed Park Motor W/Integral 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 switch off and connect test lamp lead to ground on vehicle and backprobe terminal 3.
2.
If lamp does not illuminate, check fuse.
3.
If fuse is satisfactory, locate and repair open circuit from fuse block to wiper motor.
4.
If fuse is blown, replace it.
5.
If fuse blows again, unplug motor and replace fuse.
6.
If fuse blows again, check for grounded condition in wire to terminal No. 3.
7.
If fuse does not blow again, check for high amperage of motor. Lowest current draw on dry glass should not exceed 6.5 amps.
8.
If lamp illuminated in step 1, connect test lamp lead to ground at wiper motor case and backprobe terminal 3.
9.
If lamp does not illuminate, check both motor ground connections.
10.
If lamp illuminates, set wiper switch to LO, connect test lamp lead to ground at wiper motor case and backprobe terminal 2.
11.
If lamp does not illuminate, repair open from wiper switch to motor.
12.
If lamp illuminates, backprobe terminal 1.
13.
If lamp does not illuminate, replace park switch.
14.
If lamp illuminates, backprobe terminal 4.
15.
If lamp does not illuminate, repair open between terminal Nos. 1 and 4 in wiring harness.
16.
If lamp illuminates, check armature, circuit breaker, circuit breaker ground and brushes.
Intermittent Wiper Operation In Pulse, LO or HI Modes
1.
Remove wiper fuse and connect 0-30 amp ammeter between fuse block terminals, set wiper to LO and note lowest current draw while wiper is
running on dry glass. (Current draw will fluctuate).
2.
If 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 current draw exceeds 6.5 amps, replace wiper blade elements and repeat test.
4.
If current draw still exceeds 6.5 amps, disconnect wiper linkage from wiper motor crank arm and repeat test.
5.
If current draw is now less than 6.5 amps, repair or replace wiper transmission linkage as necessary.
6.
If current draw still exceeds 6.5 amps, replace wiper motor.
Wiper Will Not Park
1.
Turn ignition switch on and wiper switch off, connect test lamp lead to ground at wiper motor case and backprobe terminal 2.
2.
If lamp illuminates, disconnect 4 terminal connector and probe terminal 2. If lamp remains on, perform wiper switch continuity check. If lamp
goes off, replace cover.
3.
If lamp does not illuminate, remove wiper cover and reconnect motor without cover, then switch motor from LO to OFF and note whether park
switch latch arm is in position to catch drive pawl.
4.
If latch arm is not in proper position, replace park switch.
5.
If latch arm is in proper position, check if drive pawl is bent.
6.
If drive pawl is bent, replace it.
7.
If drive pawl is not bent, check shaft endplay. If drive pawl overrides latch, replace shaft assembly.
No Delay Or Continuous In Delay (Wipers Okay In Low Or High Speed)
1.
Connect voltmeter between terminal 6 and ground at motor case and vary delay from minimum time to maximum time. Voltage should vary from
maximum to minimum.
2.
If voltage does not vary, perform wiper switch continuity check.
3.
If voltage varies, turn ignition switch on and set wiper switch to minimum delay, then connect test lamp lead to ground at motor case and
backprobe terminal 2.
4.
If lamp does not illuminate, perform wiper switch continuity check.
5.
If lamp illuminates, backprobe terminal No. 1.
6.
If lamp illuminates, replace cover.
7.
If lamp does not illuminate, remove cover and check whether park switch pulse terminals are touching pads on circuit board. It they are, replace
cover. Otherwise, replace spring contacts.
No LO Mode
1.
Set wiper switch to LO, connect test lamp lead to ground at motor case and backprobe terminal 2.
2.
If lamp does not illuminate, repair open from wiper switch to motor.
3.
If lamp illuminates, backprobe terminal 1.
4.
If lamp does not illuminate, replace park switch.
