DTC C1A05 Stop Light Switch Circuit: Description

When the brake pedal is depressed, the stop light switch sends signal to the driving support ECU. Receiving the signal, the driving support ECU cancels the dynamic radar cruise control system. Even if these is a malfunction in the stop light signal circuit while the cruise control is in operation, normal driving is maintained due to fail-safe function. Dynamic radar cruise control is canceled when positive battery voltage is applied to terminal STP-.

When the brake pedal is depressed, positive voltage is applied to terminal STP- of the driving support ECU through the STOP fuse and the stop light switch, and the driving support ECU cancels the cruise control.

When the brake pedal is released, positive voltage is applied to terminal ST1- of the driving support ECU through the ECU-IG fuse and the stop light switch, and the driving support ECU operates the dynamic radar cruise control.