Two Speed Wiper System
Fig. 2 Intermittent Wiper Motor Terminal Locations:
Fig. 1 Two-speed Motor Terminal Locations:
Motor Will Not Operate In Any Switch Position
Prior to performing diagnostic procedures, check for blown fuse in fuse block. If fuse is good, proceed to step 1. If fuse is defective, replace and check for motor operation in all switch positions. If motor is still inoperative, and fuse does not blow, proceed to step 1. If replacement fuse blows, disconnect motor wiring connector, then replace fuse. If fuse does not blow, motor is defective. If fuse blows, faulty switch or wiring is indicated.
1. Place wiper switch in low position and listen to hear if motor is running.
2. If motor is running, but output shaft is not rotating, replace gear box assembly. If drive shaft is turning, check drive link to output shaft or linkage for proper connection.
3. Check wiper system fuse on 1983 FWD models and all 1984---88 models, and replace if necessary. If fuse blows again, proceed to step 8. If fuse does not blow, continue with next step.
Fig. 2 Intermittent Wiper Motor Terminal Locations:
Fig. 1 Two-speed Motor Terminal Locations:
4. Connect voltmeter between wiper motor terminal L and ground, leaving electrical connector in place. On all except 1983 FWD models and all 1984---87 models, observe meter for several minutes to check circuit breaker. If circuit breaker is cycling, proceed to step 8.
5. If meter indicates approximately 12 volts, check motor ground as follows:
a. On models without concealed wipers, ensure ground strap is properly connected and free of corrosion.
b. On models with concealed wipers, connect jumper wire between motor terminal P(2) and ground. If motor runs, check continuity of wiring between motor and switch, switch continuity and ensure switch is grounded.
6. If motor ground is satisfactory in step 5, check wiper motor brushes and armature, and repair as needed.
7. If voltmeter indicates no voltage at motor terminal L, and fuse or circuit breaker is satisfactory, check continuity of wiper system wiring and wiper switch. Repair wiring or replace switch as needed.
Fig. 2 Intermittent Wiper Motor Terminal Locations:
Fig. 1 Two-speed Motor Terminal Locations:
8. If wiper system fuse is blown on 1983 FWD models and all 1984---88 models or if circuit breaker is cycling on all other models, disconnect electrical connector to wiper motor. On 1983 FWD models and on all 1984---88 models install a suitable test circuit breaker across wiper system fuse terminals.
9. Check voltage at terminal L in electrical connector to wiper motor.
10. If circuit breaker continues to cycle, check for short circuit in wiper system wiring or defective switch.
11. If meter indicates approximately 12 volts in step 9, and circuit breaker does not cycle, check motor as follows:
a. Remove wiper arm assemblies.
b. Connect positive lead of ammeter to battery positive post, and connect negative lead to motor terminal L. On models with concealed wipers, connect jumper wire between motor terminal P(2) and ground.
c. If motor operates and draws less than 6 amps, motor is satisfactory. Recheck switch, wiring and circuit breaker.
d. If motor does not operate, or operates but draws more than 6 amps, disconnect ammeter and remove crank arm retainer and arm from motor.
e. Repeat step b. If motor operates and draws 3 amps or less, repair wiper linkage. If motor does not operate, or operates but draws more than 3 amps, repair or replace motor.
Motor Operates At Either High Or Low Speed Only
1. If motor operates at low speed, place wiper switch in high position and connect test lamp between motor terminal H and ground. If motor operates at high speed, place wiper switch in low position and connect test lamp between motor terminal L and ground. Leave electrical connector connected to motor.
2. If test lamp does not light at motor terminal, there is an open circuit in wiper switch or wiring. If test lamp lights at motor terminal, brush is not making good contact with commutator.
Wiper Motor Will Continue To Operate With Switch In Off Position
1. On models with non-concealed wipers, remove wire connector and connect jumper wire from motor terminal L to terminal P(2). Connect a second jumper wire from terminal P(1) to battery. If motor runs to park position and stops, wiper switch is defective. If motor continues to operate and does not park, replace gear box assembly.
2. On models with concealed wipers, disconnect wire connector and connect a jumper wire from terminal P(1) to battery. Connect a second jumper wire from terminal L to ground. If motor runs to park position and stops, wiper switch is defective. If motor continues to operate, replace gear box assembly.
Wipers Do Not Return To Park Position
1. Remove wiper motor wire connector and clean terminals.
2. Place wiper switch in park position.
3. Connect a voltmeter between terminals P(1) and L. If a reading of 12 volts is obtained at terminal P(1), check voltage at terminal P(2). If voltage at terminal P(2)is zero, park switch is defective and gear box assembly must be replaced. If there is 12 volts at terminal P(2), there is an open circuit in wiper switch or wiring.