Town Car V8-281 4.6L SOHC (1991)
Wiper Motor: Testing and Inspection
Parking Test
The ignition switch must be in RUN for all tests. Verify proper operation of wiper system in LOW. With system operating in LOW, turn wiper system
switch to OFF when wiper blades are in vertical (straight-up) position. Wipers should complete cycle and depress park (below windshield). If the wiper
blades do not park, refer to appropriate condition of system below. Test and service as indicated.
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Motor stops when wiper switch is turned to OFF. (Does not complete cycle.)
1. Remove motor park switch connector and check for battery voltage on Circuit 65 (dark green). If battery voltage is not present, service
circuit as required. If voltage is present, go to Step 2.
2. Check ground wiring at switch connector for ground. Service as required. If ground is OK, go to Step 3.
3. With both wiper motor connectors disconnected, use an ohmmeter to verify continuity (less than one ohm resistance) between Circuits 28
and 56 in the wiring harness. If continuity is not present, trace and service as required. If continuity is OK, leave connectors disconnected
and go to Step 4.
4. Check for continuity to ground terminal on gear cover at circuit terminal 28 on wiper motor. If open, replace motor. If ground is present,
leave connectors disconnected and go to Step 5.
5. Verify continuity (less than one ohm resistance) between Circuits 61 and 63 in the wiring harness. If continuity is not present, trace and
service as required. If lack of continuity is traced to interval governor, check wiper switch for continuity between terminals P and G.
Replace switch if continuity is not present between terminals P and G. If continuity is present between terminals P and G on wiper switch,
and lack of continuity has been traced to interval governor, replace governor. If continuity between Circuits 61 and 63 is OK, leave
connectors disconnected and go to Step 6.
6. Check for continuity between circuit terminals 63 and 65 on wiper motor. If open, replace motor.
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Wiper blades go into depressed park (below windshield), but wiper motor keeps running. Replace motor.
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Wiper blades stall or jam (motor starts running in reverse direction) while going from park to depressed park.
1. Check linkage and service as required. If OK, go to Step 2.
2. Check wiper motor arm and windlatch assembly. If bent or cracked, replace motor.
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Wiper blades complete cycle, but continue to wipe for part of another cycle and park on windshield, or
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Wiper blades run continuously in OFF or INT, or
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Wiper blades run to bottom of windshield and stop, but will not depress park below windshield.
1. Perform wiper switch continuity test. If continuity test is OK on interval wiper system, go to Step 2.
2. Check Circuit 941 for no voltage. If any voltage is present, service as required. If no voltage is present, go to Step 3.
3. Disconnect connectors at wiper motor and check for continuity between Circuits 61 and 63 going to interval governor. If open, replace
governor. If continuity is present, replace motor.
