Locks
See VIDA Design and Function, Central locking.
Scheme 609
The inclination sensor module (ISM) is on the left-hand side of the rear relay box.
The inclination sensor module (ISM) is powered from the rear electronic module (REM), which both activates and deactivates it. Information is transferred from the inclination sensor module (ISM) to the rear electronic module (REM) using serial communication.
The inclination sensor module (ISM) detects when the angle of the car changes. If the angle changes when the car is alarmed, a signal is transmitted to the rear electronic module (REM) which sends this data out on the controller area network (CAN) to activate the alarm.
There are diagnostics for the Inclination Sensor Module (ISM).
Scheme 610
Cars with Bi-Xenon lamps have a position sensor so that the headlamps can automatically adjust beam length. The vertical adjustment accounts for load and road conditions to reduce the risk of dazzle.
The position sensor is beside the rear axle and is connected to the left-hand rear control arm by a linkage system. This linkage system affects the sensor, allowing the angle of the car to be gauged.
The position sensor is directly connected to the rear electronic module (REM) via three inputs. Two are used for the power supply and ground connection for the sensor. One input is used for signals about the angle of the car. The signals are received by the rear electronic module (REM) which sends them onwards via the Control area network (CAN) to the central electronic module (CEM) which controls the headlamp range adjustment function.
The position sensor can be calibrated using VIDA. The calibration is saved in the rear electronic module (REM) and must be carried out again if the rear electronic module (REM) or position sensor is replaced.
There are diagnostics for the position sensor.
Scheme 611
The fuel level in the tank is measured by two sensors. The sensors are located on each side of the fuel tank. Cars with engine B5244S6 have only one sensor, on the pump side. The sensors are directly connected to the rear electronic module (REM).
There are different tables for different fuel tank sizes. These are stored in the rear electronic module (REM) and indicate which sensor values correspond to the remaining fuel in the tank. The rear electronic module (REM) determines which tank is in the car by reading a parameter.
The resistance of the sensor increases as the fuel volume in the tank decreases. The signals from the sensors are compared with the values in the fuel tank table to obtain a value for the remaining fuel volume. This data is displayed by the fuel gauge in the driver information module (DIM).
If the sensors are faulty, the fuel gauge will show 0.
There are diagnostics for the fuel level sensors.
Scheme 612
CNG (Compressed Natural Gas)
The fuel level in the gasoline tank operates in the same way as for cars with B5244S6 engines, using a sensor in the tank. A combined pressure and temperature sensor is used to measure the fuel level in the gas tank. The sensor is on the left-hand side of the gas tank.
The sensor is directly connected to the rear electronic module (REM). The signals from the sensor are transmitted to the rear electronic module (REM) where they are calculated and sent to the driver information module (DIM) via the Control area network (CAN).
There are diagnostics for the fuel level sensor.
LPG (Liquefied Petroleum Gas)
The fuel level in the gasoline tank operates in the same way as for cars with B5244S6 engines, using a sensor in the tank.
A sensor, on the right-hand side of the tank, is used to measure the fuel level in the LPG tank. The sensor is directly connected to the rear electronic module (REM). The signals from the sensor are compared with a table stored in the rear electronic module (REM). Data about the remaining volume of fuel is transmitted via the Control area network (CAN) to the driver information module (DIM).
There are diagnostics for the fuel level sensor.
Scheme 613
There are shut-off valves on the gas tanks to open and close the tank valves on bi-fuel cars.
These are positioned at the inlet/outlet on each gas tank. There is one for LPG and three for CNG.
The valves are controlled electro-magnetically and powered via a relay directly connected to the rear electronic module (REM). The rear electronic module (REM) activates the relay when a request for gas power is transmitted on the controller area network (CAN).
The valves close when the car is running on gasoline, when the ignition is switched off or in the event of a collision.
The valves can be opened via a diagnostic command by activating the relay for the gas valves. Activation is carried out in VIDA via the vehicle communication socket. See function group 3, Rear Electronic Module (REM).
The valves can also be closed manually using an Allen key or opened by unscrewing the shut-off valve and replacing it with a special tool.
There are diagnostics for the shut-off valve relay.
Scheme 614
There is a diesel filter on the fuel line from the fuel tank. The rear electronic module (REM) controls warming up the filter by checking the power supply to the filter via a relay. The relay is in the rear relay box.
There is a temperature switch between the rear electronic module (REM) and the relay. The temperature switch closes at approximately -3 °C, which also closes the relay circuit. The temperature switch switches off at approximately 5 °C which breaks the power supply by releasing the relay.
There are diagnostics for the relay circuit for warming up the diesel filter.
Scheme 615
The rear fog lamp are in the tail lamps. The fog lamps are operated via a button in the light switch module (LSM). An LED in the button lights when the fog lamps are activated. The rear fog lamp can only be activated when low beam is on (market dependent). The light switch transmits information to the central electronic module (CEM) using serial communication when the button for the rear fog lamp is pressed. The central electronic module (CEM) transmits the data via the Controller area network (CAN) to the rear electronic module (REM). The power supply for the lamps is via a directly connected relay on the rear electronic module (REM).
When reactivating key position II, the function is set to non-activated mode.
In order to detect bulb faults for the rear fog lamp, the rear electronic module (REM) detects the power consumption in the circuit using a directly connected shunt. If the power consumption falls below a certain limit, a fault is indicated and a text message is displayed in the driver information module (DIM).
There are diagnostics for the rear fog lamp relay.