A method for remotely controlling a vehicle audio system, which is
controlled in accordance with an instruction from an infrared remote
control unit, uses a radio frequency remote control unit to remotely
control the vehicle audio system. A security system receives a command
transmitted from the radio frequency remote control unit. In a security
control mode, the vehicle security system performs security control based
on the command. In an audio control mode, the security system transmits
the command to an audio control interface unit. The audio control
interface unit converts the command transmitted from the security system
into an infrared remote control unit command. Based on the infrared remote
control unit command, an infrared emitter is driven to emit infrared rays,
thus controlling the vehicle audio system by the infrared rays.
