Wiper High/Low Relay Test

DIAGNOSIS AND TESTING - WIPER HIGH/LOW RELAY

Fig. 31 ISO Micro Relay:

The wiper High/Low rela is located in the Power Distribution Center (PDC) in the engine compartment near the battery Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

1. Remove the wiper high/low relay from the PDC.
2. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK, go to Step 3. If not OK, replace the faulty relay
3. Resistance between terminals 85 and 86 (electromagnet) should be 75 (+/-) 8 ohms. If OK, go to Step 4. If not OK, replace the faulty relay.
4. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A and 30. If OK, reinstall the relay and use a DRBIII scan tool to perform further testing. Refer to the appropriate diagnostic information.