223001552 - E2021 BRAKE LIGHTS - DESCRIPTION (MY 2005)

The vehicle brake lights are located at the rear in the side light clusters and in the special central third brake light.All three bulbs are operated each time the brake pedal is pressed via a switch on the actual pedal.The centre light is operated directly, whilst the two side lights are managed by the body computer.

the switch on the pedal consists of two contacts that supply two signals: the first N.A. type recognizes the position of the brake pedal if it is different from the rest position; the second N.C. type: recognizes the position of the brake pedal in the rest position.

The circuit is supplied with the key on MAR and protected by a fuse located in the dashboard junction unit.The braking signal is also sent from the switch to the ABS, via the vehicle electronic control signal, which recognizes the situation and consequently controls the actual braking.The same signal is also sent to the engine management system which takes the braking condition into account when processing the engine management logic.The brake lights check function is available on the version with a Comfort instrument panel.Any fault can be recognized by the vehicle branch (left or right side), in which case the Body Computer transmits the failure status via the CAN to the instrument panel which lights up the special "exterior lights failure" warning light and simultaneously shows the information in the display.