3315548 - E2021 BRAKE LIGHTS - Functional description (Right hand drive)

Functional description

The main beams are controlled by electronic Check device M45 , which receives control signals from the switches and controls the bulbs while also checking the various lines. The supply for the Check device M45 arrives directly from the battery (maxifuse CENTR of B5 ) at pins 1 and 6 of connector C, via fuse F11 of junction unit B1 . The supply controlled by the ignition (INT/A) arrives via fuse F1 of junction unit B1 at pin 9 of connector C: pin 7 of connector C is earhed. The switch I30 is supplied when the ignition is turned on (INT/A) from fuse line F1 of junction unit B1 :when the brake pedal is pressed, the switch closes and sends the operation signal to pin 1 of connector B of M45 . The supply line I30 is also sent to the Check device M45 - pin 2 of connector C - which checks its condition. The check device also controls - pin 7 and pin 5 of connector B - the supply to the side stop lights in the rear lights clusters F30 ed F31 and connector B of the centre rear light cluster F40 from pin 8. The device M45 checks the efficiency of the bulbs and their connections: if faults are detected in the circuit, the 'lights fault' warning light on the instrument panel E50 , pin 7 of connector C, is lit from pin 6 of connector A, while pin 15 of connector A supplies an ignition-operated power supply to the panel through fuse F1 of the junction unit B1 . In this specific case, the control unit also checks the supply line of switch I30 , and if necessary indicates any faults. The braking signal for the switch I30 is sent from the switch to the ABS (  See E7020  ABS ) and to the engine management control unit as well (  See E5030  PETROL ENGINE ELECTRONIC MANAGEMENT or  See E5050  DIESEL ENGINES ELECTRONIC MANAGEMENT ).