Heater System: Testing: Relays

1. Remove relay. Ensure continuity exists between terminals "B" and "D". Ensure no continuity exists between terminals "A" and "C". If continuity is not as specified, replace relay. If continuity is as specified, go to next step.
2. Apply battery voltage across terminals "B" and "D". See Fig 1 . Ensure continuity exists between terminals "A" and "C". If continuity is not as specified, replace relay.

Fig 1: Testing Relay

Courtesy of AMERICAN HONDA MOTOR CO., INC.