Patent ID: 7649448

Claim:
A stop lamp lighting controller for supplying a battery voltage to a stop lamp through a braking detection switch element turned on at a braking operation time of a vehicle, and comprising: a main line and a subline arranged in parallel between said braking detection switch element and the stop lamp; a first relay for setting said main line to a conducting state in a de-energizing state, and setting said main line to a non-conducting state in an energizing state; a second relay for selecting said main line in the de-energizing state and supplying the battery voltage from said braking detection switch element to said stop lamp through the main line, and selecting said subline in the energizing state and supplying the battery voltage from said braking detection switch element to said stop lamp through the subline; sudden braking state judging means for judging a sudden braking state; first control means for controlling said first relay to the de-energizing state when no sudden braking state is judged by said sudden braking state judging means, and also periodically controlling said first relay to the de-energizing state and the energizing state when the sudden braking state is judged by said sudden braking state judging means; abnormality judging means for judging an abnormality of said main line; and second control means for controlling said second relay to the de-energizing state when no abnormality of said main line is judged by said abnormality judging means, and also controlling said second relay to the energizing state when the abnormality of said main line is judged by said abnormality judging means.