K 30 P/U 4WD V6-262 4.3L (1985)
Wiper Motor: Testing and Inspection
Permanent Magnet Motor
On models with pulse wipers, disconnect electrical connectors from pulse module and connect switch and motor harnesses together. If problem is
corrected, pulse module is defective.
Fig. 1 Permanent magnet type windshield wiper motor
1980---87 C, K, G, R & V MODELS
Wiper Inoperative
1.
Turn ignition switch On, then check for voltage at motor terminal No. 1, Fig. 9, using a suitable test lamp. If lamp does not light, proceed to step 5.
If lamp lights, proceed to step 2.
2.
Check condition of fuse. If fuse is satisfactory, repair open in wire between fuse block and wiper motor. If fuse is blown, proceed to step 3.
3.
Remove fuse and connect ammeter across fuse block terminals. Operate motor and note current draw. If current draw exceeds capacity of original
fuse, proceed to step 4. If current draw is satisfactory, replace fuse and recheck system.
4.
Disconnect electrical connector from motor and replace fuse. Cycle wiper switch on and off several times, then recheck fuse. If fuse blows again,
check circuit for short or ground and repair as necessary. If fuse is satisfactory, motor is defective.
5.
Connect jumper wire between motor terminal No. 2 and ground with ignition switch On. If wiper operates, check ground wire connection at wiper
switch. If connection is satisfactory, replace switch. If wiper is still inoperative, motor is defective.
Wiper Operates At Low Speed Only
1.
Connect jumper wire between motor terminal No. 3 and ground, Fig. 9, with ignition switch On and electrical connector attached to motor.
2.
Move wiper switch to high speed position.
3.
If wiper runs at high speed, check wire between terminal No. 3 and switch and repair as necessary. If wire is satisfactory, replace switch.
4.
If wiper is inoperative, motor is defective.
Wiper Operates At High Speed Only
1.
Connect jumper wire between motor terminal No. 2 and ground, Fig. 9, with ignition switch On and electrical connector attached to motor.
2.
Move wiper switch to low speed position.
3.
If wiper runs at low speed, check wire between terminal No. 3 and switch and repair as necessary. If wire is satisfactory, replace switch.
4.
If wiper is inoperative, motor is defective.
Wiper Operates At One Speed In Both High & Low Switch Positions
1.
Disconnect electrical connector from wiper motor and alternately connect battery voltage to motor high and low speed terminals, Fig. 9.
2.
If wiper operates correctly in both positions, check continuity of wiring between wiper motor and switch and repair as necessary. If wiring is
satisfactory, replace switch.
3.
If wiper operates at one speed in both switch positions, motor is defective.
Wiper Blades Stop At Random Position On Windshield
1.
Connect jumper wire between motor terminals 4 and 5, Fig. 9, with ignition switch On and electrical connector attached to motor.
2.
Move wiper switch to off position.
3.
If wiper operates, replace wiper park switch assembly.
4.
If wiper is inoperative, check wire between terminal No. 5 and switch and repair as necessary. If wire is satisfactory, replace switch.
