Circuit Operation
Battery voltage is applied to terminal 85 and terminal 87
of the horn relay at all times. Pressing the horn switch grounds the horn
relay coil. The relay coil may also ground on CKT 28 (BLK) by
the remote function actuator (RFA) module. Refer to
Cell 132: RFA Module Power and Ground
in Keyless Entry for
entry circuit operation. Refer to
Cell 132: RFA Module Inputs and Outputs
in
Keyless Entry. The horn relay applies battery voltage to the horns when
the relay becomes energized. The horns sound until the horn switch
releases or until the RFA signal stops.
The remote function actuator (RFA) module causes a number of horn actuations according to function. Locking or unlocking the vehicle through the use of a key fob transmitter causes a short pulsed horn actuation. The following actions cause a continuous pulsed horn output from the RFA:
| • | A class 2 message from the universal theft circuit |
| • | Pressing the panic sequence on one of the key fobs |
