Rear-end electronics control unit

Electrics and electronics 9

9_59_11 Other functions

• Anti-removal lock for ignition lock/P switch • Central locking antenna (windshield - remote control) • Switch/glove compartment light (+) • Washer fluid level sensor • Crash signal (PWM) • Terminal 15 - heated washer jets • Two-tone horn relay • Tank cap actuating element • Dual washer pump f/r • Headlight cleaning system

9.6 Rear-end electronics control unit

The rear-end electronics control unit communicates with the gateway via CAN Comfort. The rear-end electronics control unit includes several function groups and functions. These will be explained in more detail below.

Lighting function group

The daytime running lights (front left/right) are controlled by way of a CAN signal from the front-end electronics control unit. The rear left and right brake lights and the high-level brake light are controlled by a hard-wired signal from the brake light switch and via a CAN signal (redundant). The back-up lights are activated by a switch on vehicles with manual transmission and by a CAN signal from the selector lever in the case of automatic transmissions. The tail lights, rear fog lights and license plate lighting are also connected to this control unit.

Other lighting functions:

• Terminal control G1 (comfort lighting) • Engine compartment light • Luggage tray light • Ambient light (rear interior light left/right) • Door sill lighting

Access and driving authorization/alarm system

The alarm siren is connected via a LIN bus (LIN 2) to the rear-end electronics control unit and triggers an alarm if an attempted theft is detected. The alarm horn is equipment-specific (especially USA) and must be coded in the rear-end electronics control unit. An alarm horn is used for the RoW market which is activated by way of a relay. The roof module is connected to the rear-end electronics control unit via a LIN bus (LIN 1). It optionally has an integrated inclination sensor (INC) and features radar interior surveillance in all vehicles. Both of these functions can be deactivated as required for certain countries by way of a pushbutton (remote control). If the vehicle is locked and an alarm event is detected by the interior surveillance system or the inclination sensor, the roof console sends a signal to the rear-end electronics control unit (alarm system master). The externally running sliding roof, air deflector and roll-up sunblind are also controlled via LIN 2.

A breakage sensor for the rear window is achieved utilizing the rear window heating element. If the heater circuit is interrupted when the alarm is activated glass breakage is detected.

Other functional scopes

• LEDs front door panels, pushbutton interior surveillance/inclination sensor • Pushbutton/microswitch for front/rear lid • Actuating element for front/rear lid • Exhaust flap control • Rear spoiler relay • Hall-effect sensors for rear spoiler • Heated rear window relay • Coolant level sensor • Brake pad wear Electrics and electronics 9

Installation position alarm siren 9_60_11