PURPOSE: To control on and off of the engine start motor of an automobile automatically by arranging a timer circuit in an audio equipment for a vehicle.

CONSTITUTION: An electric current is sent to an engine start motor from a power supply connection connector 1e for turning on and off a power supply to the engine start motor through a timer circuit and a controller 1c when a set time comes by providing the timer circuit, the start circuit of the engine start motor and the controller 1c for controlling them in an audio equipment loaded on a vehicle.