Wiper Motor: Testing and Inspection

Current Draw Test

Fig. 29 Wiper Motor Current Draw Test:

Fig. 30 Wiper Motor Current Draw Test. Mark VII:

Fig. 31 Wiper Motor Current Draw Test. Continental, Sable & Taurus:

1. Disconnect battery.
2. Disconnect wiper linkage from motor.
3. On Mustang models proceed as follows:
a. Disconnect electrical connector from motor.
b. Make test connections as shown Fig. 29. Alternately connect the red jumper wire to high and low speed wiper motor terminals.
c. Current draw at either terminal should not exceed 3.5 amps.
4. On Continental, Cougar, Mark VII and Sable, Taurus models proceed as follows:
a. Make test connections as shown Figs. 30 and 31. Alternately ground the high and low speed wiper motor terminals.
b. Current draw at either terminal should not exceed 3.5 amps.

Park Operation Test, Mustang

Fig. 32 Wiper Motor Park Operation Test (Non-Depressed):

1. Turn ignition switch to ON.
2. Turn wiper switch to ON.
3. When wipers are in a non-parked position, turn ignition switch to OFF.
4. Make test connections as shown Fig. 32. Wiper motor should run one full cycle then park.
5. If wiper motor does not run to park, or will not park, replace it.
6. If wiper motor stops, check for continuity at wiper switch and wiper system wiring. Replace or repair as needed.
7. If continuity and the wiper switch test good, and wiper motor will not stop in OFF or INT position, replace the governor.

Park Operation Test

SCHEMATIC DIAGRAMS/ELECTRICAL AND ELECTRONIC DIAGRAMS when performing the following test procedures.
1. Turn ignition switch to ON.
2. Turn wiper switch to LO. Ensure wiper operation is proper.
3. With wipers in a vertical position turn wiper switch to OFF. Ensure wipers cycle once then park below the windshield.
4. If wipers do not function as described, perform test steps 5 through 10 according to wiper malfunction.
5. If wipers stop without cycling and parking proceed as follows:
a. Disconnect wiper motor park switch electrical connector.
b. With ignition switch ON, check for battery voltage at park switch electrical connector (dark green wire) terminal 65. If battery voltage is not present repair the circuit.
c. If battery voltage is present at terminal 65, check motor housing ground. Repair as needed.
d. If motor housing ground is good, turn ignition switch to OFF, then disconnect wiper motor electrical connectors.
e. Using a suitable ohmmeter, check for continuity between wiring harness terminals 28 and 56. If continuity does not exist, repair the open circuit.
f. If continuity does exist between terminals 28 and 56, check for ground at wiper motor terminal 28. If ground is open, service the park switch.
g. If ground is good at wiper motor terminal 28, check for continuity between wiring harness circuits 61 and 63. If continuity exist proceed to step J.
h. If continuity does not exist between wiring harness terminals 61 and 63, repair the open circuit. If open circuit is traced to [1][2]interval governor, check for continuity between wiper switch terminals P and G. If open exists between terminals P and G, replace the wiper switch.
i. If open does not exist between wiper switch terminals P and G, replace the [1][2]interval governor.
j. Check for continuity between wiper motor terminals 63 and 65, if open exists service wiper motor park switch.
6. If wipers park below the windshield and the motor stays running, service the park switch.
7. If wipers jam or stall when parking below the windshield and the motor runs in reverse, proceed as follows:
a. Check wiper linkage. Repair as needed.
b. If wiper linkage is satisfactory, service windlatch assembly and wiper motor arm.
8. If wipers travel into the next cycle, then park on the windshield, proceed as follows:
a. Perform wiper switch continuity test as described under WIPER SWITCH for these models.
b. On non-intermittent systems, if wiper switch continuity test is good, replace wiper motor.
c. On intermittent systems, if wiper switch continuity test is good, check for voltage at washer terminal 941. If voltage is present repair as needed.
d. If voltage is not present at washer terminal 941, disconnect wiper motor electrical connectors and proceed to next step.
e. Check for continuity between terminals 61 and 63. If open exist replace governor.
f. If continuity exist between terminals 61 and 63, replace wiper motor.
9. If wipers run constantly in OFF or INT positions, perform test procedures in step 8.
10. If wipers stop at bottom of windshield, but do not park bellow windshield, perform test procedures in step 8.