Operation CHARM: Car repair manuals for everyone.

Horn Relay

Range: ON/OFF
The horn relay output refers to the commanded state of the horn relay coil. The horn button and the RFA transmitter panic button are inputs to the BCM. The BCM supplies a ground to the horn relay coil and sounds the horns.

ON displays when the BCM commands the horn relay coil to turn ON when you perform the following steps:
1. Press the horn button.
2. Press the transmitter panic button.

OFF displays when the BCM does not command the horn relay coil to turn ON and neither the RFA transmitter panic button nor the horn button are pressed.