The brake light switch informs the ABS/ASC control unit of when the brake pedal is operated. This results in immediate termination of any brake intervention during an ASC control function thus improving the control comfort.
Note
Faults in the brake light switch circuit are stored in the defect code memory, however, the ABS safety lamp does not light up in this case.
The handbrake switch informs the ABS/ASC control unit that the handbrake is applied. This results in an increase in the threshold for the engine drag torque control (MSR) thus improving the control comfort.
The ASC subsystem can be switched off with the ASC passive button under special driving conditions (e.g. driving off in deep snow). This is indicated by a steady light in the multifunction lamp. The ABS subsystem remains operable without restriction.
The ASC system is reactivated after pressing the button once again.