Horn: Description and Operation
HORNWARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO ELECTRICAL, RESTRAINTS FOR STEERING WHEEL REMOVAL PROCEDURES.
Fig.1 Horn System Schematic:
The horn circuit consists of a horn switch, horn relay, and horns.
The horn circuit feed is from the fuse to the horn relay in the Junction Block. When the horn switch is depressed, it completes the ground circuit. Then the horn relay coil closes a set of contacts which allows current to flow to the horns. Refer to Horn System Schematic.
HORN CHIRP TOGGLE
Once the transmitters have been programmed, the horn chirp can be enabled/disabled by sending the horn chirp toggle operation code to the Body Control Module (BCM).
This can be done using a DRB III scan tool or by the customer. The horn chirp will enter the opposite state of its current programmed state by receiving this operation code. The BCM is responsible for keeping track of the horn chirp status.