Headlight Relay

Remove headlight relay. Check continuity between headlight relay terminals "C" and "D". See Fig 1 . If continuity exists, replace headlight relay. If continuity does not exist, apply battery voltage across headlight relay terminals "A" and "B". Check continuity between headlight relay terminals "C" and "D". If continuity exists, headlight relay is okay. If continuity does not exist, replace headlight relay.

Fig 1: Identifying Headlight Relay Terminals

Courtesy of MAZDA MOTORS CORP.