- Remove the relay from its mount and disconnect the harness.
- Use an ohmmeter to check continuity. There should be no continuity between terminals 1 and 5. Continuity should exist between terminals 2 and 4.
- Apply 12 volts to pin 2 and ground pin 4. With power applied, continuity should be found across terminals 1 and 5.
- If any test condition is not met, the relay must be replaced.