Gateway

Gateway - Bus Interfaces







The LIN interfaces are designed as LIN master interfaces. These LIN interfaces are intended for a battery sensor connection and for connecting an intelligent main fuse carrier. Energy management on the gateway can use the battery sensor to call up various battery characteristics, e.g. voltage, battery charging condition, etc and if required switch off the control units in the vehicle electrical system. For this purpose, the gateway sends the relevant switch-off messages, e.g. via the same LIN bus, to the intelligent main power distributor.







Tasks:
- The gateway control unit facilitates the exchange/translation of data between the various networks and bus technologies (CAN/LIN)
- Vehicle energy management
- Optimization of battery charging during driving
- Terminal management, before/after driving the vehicle, (WfS5, ELV)

- System and diagnostic functions (PIDT - PIWIS diagnostic tester)
- Wake-up/power-down function (Vehicle Network State Manager)

Front-End Electronics Control Unit







The front-end electronics control unit is located by instrument panel/steering wheel and is connected directly to CAN comfort. The control unit delivers the supply voltage for the ignition lock and the axle height sensor via output terminals 30.







- LIN 1 = Light and vision functions
LIN control units: Rotary light switch (RLS), rain-light-moisture sensor (RLM sensor) and wipers

- LIN 2 = Access systems
LIN control units: Electronic ignition lock (EIL), electronic steering column lock (ELV)

- LIN 3 = Comfort
LIN control units: Electronically adjustable steering column (EASC), garage door opener or Home Link

Exterior Lights

A rotary light switch (RLS), which is connected via a LIN bus system, controls the marker light, dipped beam, high beam and fog lights. In addition, the switch setting "0" is transferred directly to the control unit. (LIN failure)

The driving light assistant (RLS position "1") can be used to automatically control light functions using the front-end electrics control unit. Light and weather conditions are a factor in this activity. A rain-light-moisture sensor is connected in order to register these.







The rain/light functions have been retained and expanded to include a moisture function, which helps to detect misting on the windshield. The data is made available to air-conditioning control via the data line in order to prevent the window from misting.

Rain sensor function:
This sensor detects quantities of rainfall and issues a wipe request for the windscreen wiper. The sensor is attached to the windscreen near the rearview mirror.

Light sensor function:
The light sensor, which is integrated into the rain sensor, detects the rapid or slow onset of darkness, e.g. a tunnel or dusk, and outputs a signal accordingly to switch on the driving light. If it is bright enough, the relevant signal for switching off the driving light is output.

Functional concept behind the moisture sensor:
The condensation sensor is used to identify how likely the windshield (inside the vehicle) is to become misted. The data is made available to air-conditioning control via the data line. Air-conditioning control can then respond and prevent condensation.

Exterior light function:
- Headlight flasher, flashing via CAN signal (CSCM)
- Hazard warning light operated manually by hazard warning light button, automatic crash signal (flashing)

Ambient Lighting

Active:
When the vehicle is unlocked, when a door is opened, when the ignition key is removed, when the RLM sensor detects darkness or the door contact function is active. Dimmable.

Not active:
When brightness is detected, when the vehicle is locked (dimmed) or when all doors, including the rear lid, are closed and the ignition is off (delayed dimming).

Orientation Lighting

Active:
When it is dark and the ignition is "off", when the vehicle is unlocked, a door is open or the ignition key is removed.

Not active:
When locking the vehicle (dimmed), when the ignition is "off".

LIN Exterior Light Signals (inputs)
- Marker light
- Dipped beam, high beam
- Fog light, switch position "0" (RLS)
- Headlight flasher, flashing (CSCM)
- UGDO, Home Link - ELV, EIL
- RLM sensor
- RLS
- Wipers

The ambient lighting in the rear is integrated into the center rear interior light and performs the same function as the ambient lighting in the roof console (slave function). As the rear interior light is connected to the roof console, the function is also performed by the roof console.

Engine Compartment Lighting

Illuminates the engine compartment and is not dimmable. It is activated when the engine compartment lid is opened and deactivated when the engine compartment lid is closed or when loads are switched off.

Luggage Compartment Lighting

Is activated (dimmed/fade in) when the rear lid is opened (Prerequisite: Load switch-off is inactive) and deactivated (dimmed/fade out) when the rear lid is closed (Load switch-off is active).

NOTES:
Automatic switching off of interior lights.
- When it is dark and the engine is not running, the interior lights are switched off after 16 minutes to save the battery.
- When it is light, interior lights that have been switched on manually are switched off automatically after 1 minute.

Interior Lights







Activation:
This light is activated by way of a switch, when a door is opened (dimmed), when the vehicle is unlocked by remote control or when the ignition key is removed, light is not switched off manually and door contact function is active. Manually dimmed when the interior light button is pressed.

Deactivation:
This light is deactivated by way of a switch, when the vehicle is locked or the ignition is switched on (dimmed), provided that the doors are closed and the light has not been switched on manually. Delay dimmed if all doors are closed, provided that the ignition is "off". Automatic, undimmed, when load switch-off is active. Manually dimmed when the interior light button is pressed or deactivated by way of the door contact button. Dimming can be programmed.

Reading Lights







Activation:
These lights are activated by controls, dimmed when a door is opened, when the vehicle is unlocked by remote control or when the ignition key is removed, light is not switched off manually and door contact function is active. Manually dimmed when the reading light button is pressed.

Deactivation:
These lights are deactivated using controls, dimmed when locking the vehicle or when the ignition is switched on, provided that the doors are closed and the lights have not been switched on manually in an unlocked vehicle. Automatic, undimmed, when load switch-off is active. Delay dimmed once all doors have been closed and provided the engine is "off". Reading lights are switched off at the same time as the interior light. Manually dimmed when switching the reading lights are "off".

Load Switch-Off

Comfort Lighting:
All lights that do not perform a safety-related function. The sole purpose of this type of lighting is to guarantee the comfort of occupants and ensure that they can get their bearings. Comfort lighting includes: reading lights, interior light or make-up lights, footwell lighting, ambient lighting, interior light, engine compartment light, luggage compartment light.

Safety lighting:
Safety lighting includes all lighting components that are responsible for the safety of the vehicle or the occupants, e.g. brake lights or hazard warning lights, door-guard lights and exit lights.

Switch-off is performed in three stages via battery management (gateway):
a. Vehicle is not locked: Comfort lighting - Gateway terminal G1 after 16 minutes Safety lighting - Gateway terminal G2 after 32 minutes
b. Vehicle is locked: Immediately after locking
c. Transport mode

Terminal Management

The front-end electronics are responsible for terminal management. The relays for terminals 15, 30 and 50 are therefore connected to the control unit. When the ignition is on, one relay switches voltage to terminal 15. When a start command is issued, one relay switches terminal 50 and the engine starts.







Control Systems







- Activation of the cooling-air flaps/DFI (speed/temperature, CAN signal)
- Activation of flaps for brake cooling
- Activation of Servotronic (power steering)
- Steering column adjustment (EASC) is activated via a LIN bus system and facilitates the adjustment by means of buttons. A variety of steering column position settings can be saved, called up using a memory function and automatically adjusted.
- The central locking system controls locking and unlocking of the filler flap. An actuating element is connected to the front-end electrics control unit for this purpose.

Wiper and Washer Functions







The wiper and washer functions are controlled via a steering column switch. This is connected to the control unit via the CAN bus. If no signals are received from the CSCM on the CAN bus, a limp-home mode is activated via the rain sensor. The washer fluid level is monitored by a sensor and the driver is notified if the level is too low.

The headlight washer system (HWS) can be started in two different ways:

by tapping the HWS button or, automatically, after every tenth activation of the headlight washing function.

Access and Driving Authorization

Access to the vehicle is gained via the mechanical closing function, remote control and Keyless Entry. For keyless operation, a valid key must be detected within one meter of the vehicle. Six antennas are provided for this purpose. They are distributed at various positions on the vehicle and connected to the control unit. The vehicle is unlocked as soon as the proximity sensors detect that someone with a valid key is approaching a door handle. The signals from the remote control are received by a UHF antenna and relayed to the front-end control unit.