3309198 - E2021 BRAKE LIGHTS - Description

Description

The brake lights are located at the rear in the side lights and in the central third brake light and consist of 10 separate bulbs.These are operated whenever the brake pedal is pressed, by means of a switch on the pedal itself.Operation of both side brake lights is monitored by the exterior lighting check device.

The following faults may occur:

• blown bulb
• bulb s.c. to earth or positive
• incorrect bulb (5W bulb instead of 21W)

A special light failure warning light comes on on the dashboard for all anomalies in the various circuits. This warning light comes on for about 6 seconds when the ignition key is turned to MAR, to indicate it is working properly, then it goes off.The circuit is protected by the two fuses protecting lights monitored by the check function.A braking signal is also sent from the switch to the ABS, which detects braking status and therefore introduces braking control. The same signal is also sent to some engine management systems, which take the braking condition into account when determining the engine control mode.

the switch fitted on the pedal assembly consists of two contacts which supply two signals: the first which is the 'N.A.' type recognizes the position of the brake pedal when it differs from the rest position, i.e. pedal pressed; the second, which is the 'N.C.' type, recognizes the brake pedal in the rest position.

The lights are switched on by the N.A. contact (pedal pressed). The 'N.A.' switch information is sent, in particular to the engine management control unit and the ABS control unit.  See E5030  PETROL ENGINE ELECTRONIC MANAGEMENT ,  See E5050  DIESEL ENGINES ELECTRONIC MANAGEMENT ,  See E7020  ABS