| 摘要 |
<p>PURPOSE:To prevent a driver from forgetting of putting off the illumination lamp of vehicle, and specially enabling automatic light put off operation. CONSTITUTION:A battery voltage check circuit 8 and a processor 9 is arranged in a audio system 2, and ON-OFF signals of ignition switch 3 and a light switch 4 can be input in the processor 9. When the ignition switch 3 is OFF and the light switch is ON the processor 9 judges that the voltage of a battery 1 is below a reference level and outputs a signal to put off an illumination light 6 under the conditions.</p> |
