BRAKE SWITCH FAILURE DIAGNOSTIC METHOD AND BRAKE SWITCH FAILURE DIAGNOSTIC DEVICE

摘要

Reliable brake switch failure diagnosis is enabled with a simple structure. Disagreement between the output signals of two brake switches (6a, 6b) provided so as to detect the operated state of a brake pedal (1) is detected (S102). If disagreement is detected, after a predetermined time from the detection time, disagreement between the output signals of the two brake switches (6a, 6b) is detected again (S108). If disagreement is detected again, counting a predetermined increment by a judgment counter is periodically repeated (S110). When the count of the judgment counter reaches a predetermined number a, the two brake switches (6a, 6b) are judged as failed (S114, S118).