Models up to 1996
1. Check for continuity between terminals "1" And "2".
2. Check for continuity between terminals "3" And "4" when battery voltage is applied between terminals "1" And "2".
Models after 1996
1. Check for continuity between terminals "3" And "4".
2. Check for continuity between terminals "1" And "2" when battery voltage is applied between terminals "3" And "4". If the conductivity is not as specified, replace the relay.