B1897 MAZDA – Horn Switch Circuit Failure

B1897 MAZDA Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B1897 MAZDA Possible Causes

Faulty Horn Relay,Faulty Horn Switch,Horn Switch harness is open or shorted,Horn Switch circuit poor electrical connection,Faulty Clockspring,Faulty Body Control Module (BCM)

B1897 MAZDA Description

The horn relay control and switched voltage is supplied by the Bussed Electrical Center (BEC). The Smart Junction Box (SJB) receives the horn signal from the horn switch (part of the steering wheel). When the horn switch is pressed, the ground is supplied from the clockspring to the vehicle harness. The SJB then activates the horn relay. Voltage is then sent to the horn, enabling the horns to sound. The ground is provided to the horns.