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 park. If the wiper blades do not park, refer to appropriate condition of system below and test and service as indicated.

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 63 (red). If battery voltage is not present, service circuit as required. If voltage is present, go to Step 2.
2. Check motor housing for ground. If ground is not present (or poor), check cup screw for tightness. If screws are tight, check motor ground strap. Service as required. If ground is OK, go to Step 3.
3. With wiper motor connector disconnected, use an ohmmeter to verify continuity (less than one ohm) between circuits 28 and 58 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 ground at circuit terminal 28 on wiper motor. If open, replace wiper motor. If ground is present, leave connector disconnected and go to Step 5.
5. Verify continuity (less than one ohm resistance) between circuits G2 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.

Wiper blades complete cycle, but continue to wipe for part of another cycle and park on windshield, or

Wiper blades run continuously in OFF or INTERVAL. Perform the following.
1. Perform wiper switch continuity test. If continuity test fails, replace switch. If continuity test is OK on standard wiper system, replace motor. If continuity test is OK on interval wiper system, go to Step 2.
2. Check wash circuit 941 for no voltage. Refer to illustration. 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 G2 and 63 going to interval governor. If open, replace governor. If continuity is present, replace motor.