Design
Design
Alarm
See Design and Function, Alarm.
Central locking
See Design and Function, Central locking.
Inclination sensor module (ISM)
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 vehicle changes. If the angle changes when the vehicle is alarmed, a signal is transmitted to the rear electronic module (REM) which sends this information out on the controller area network (CAN) to activate the alarm.
There are diagnostics for the Inclination Sensor Module (ISM).
Headlamp range adjustment position sensors (Bi-Xenon)
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.
Fuel level (Bi-fuel)
CNG (Compressed Natural Gas)
The fuel level in the gasoline tank operates in the same way as for vehicles with B5244S6 engines, using a sensor in the gasoline 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) and engine control module (ECM) via the controller 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 vehicles with B5244S6 engines, using a sensor in the gasoline 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 to the driver information module (DIM) and engine control module (ECM) via the controller area network (CAN).
There are diagnostics for the fuel level sensor.
Shut-off valve (Bi-fuel)
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 and 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) by the engine control module (ECM).
The valves close when the vehicle 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 vehicle communication.
The valves for the CNG tanks can also be closed manually using an Allen key.
There are diagnostics for the shut-off valve relay.
Diesel filter preheating (Diesel)
There is a diesel filter on the fuel line from the fuel tank. The rear electronic module (REM) controls warming up of the filter by checking the power supply to the filter via a directly connected relay in the rear electronic module (REM).
There is a temperature switch for the diesel filter. The temperature switch closes at approximately -3 °C, which also closes the relay circuit. The temperature switch switches off at approximately 5 °C, breaking the power supply.
There are diagnostics for the relay circuit for warming up the diesel filter.
Rear fog lamp
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 in the rear electronic module (REM).
When reactivating key position II, the function is set to non-activated mode.
To detect faults in the rear fog lamps, the rear electronic module (REM) reads the power consumption of the circuit. If the power consumption falls below a certain limit, a fault is indicated and a text message is displayed in the driver information module.
Rear parking lamps/license plate lighting
There are a number of lamps positioned around the car to mark its position. These are in the headlamps and tail lamps. The lamps light together with the license plate lighting when the light switch module (LSM) is in parking lamp mode or low beam is on.
The rear parking lamps and license plate lighting are powered by the rear electronic module (REM).
The front parking lamps are powered by the central electronic module (CEM). For further information, see Design and Function, central electronic module (CEM).
There are diagnostics for the rear parking lamps and license plate lighting.
Back-up lamp
There are two back-up (reversing) lamps. These are in the tail lamps. The back-up (reversing) lamp lights when back-up (reverse) gear is selected. The back-up (reversing) lamps are connected to the rear electronic module (REM) via an internal directly connected relay. The lamps are powered via the relay.
Cars with manual transmissions
Cars with manual transmissions have a back-up (reverse) switch on the transmission. The switch closes and transmits a directly connected signal to the central electronic module (CEM) when back-up (reverse) gear is selected.
Cars with automatic transmissions
In cars with automatic transmissions, a signal is transmitted from the transmission control module (TCM) on the controller area network (CAN) to the central electronic module (CEM) indicating that back-up (reverse) gear is selected.
Brake light
The stop lamps are in the tail lamps. The lamps light when the stop lamp switch on the brake pedal is closed. The stop lamp switch is connected to the central electronic module (CEM). The signal from the stop lamp switch is sent on to the rear electronic module (REM) via a hardwired cable. The power supply for the lamps is via a directly connected relay in the rear electronic module (REM). In order for the stop lamps to work when the ignition is not on, there is no logic in the rear electronic module (REM) to activate the relay. The relay is activated directly by the signal from the stop lamp switch. The rear electronic module (REM) receives data via the controller area network (CAN) from the central electronic module (CEM) indicating that the stop lamp switch is activated.
To detect faults in the stop lamps, the rear electronic module (REM) reads the power consumption of the lamp circuit. If the power consumption falls below a certain limit, a fault is indicated and a text message is displayed in the driver information module.
There are diagnostics for the stop lamps.
High level stop lamp
There is a high-mounted stop lamp on the inside of the rear windshield. This lamp lights during braking together with the standard stop lamps. The stop lamp is activated when the stop lamp switch on the brake pedal is closed.
The high mounted stop lamp is supplied with power directly from the rear electronic module (REM). The lamp consists of a number of LEDs.
There are diagnostics for the high level stop lamp.
Rear windshield wiper/washers (V70/XC70/XC90)
See Design and Function, central electronic module (CEM).
Rear demist
There are heating loops in the glass for demisting and to prevent ice from forming. The loops heat up when they are supplied with power. The power supply is via a directly connected relay in the rear electronic module (REM).
Rear demist is controlled using a switch on the right-hand side of the climate control module (CCM).
The engine must be running for the demister to work. Press the button again to switch off the function. Demisting is switched off automatically after the maximum time of 12 minutes.
There are diagnostics for the switch via the climate control module (CCM).
Electric folding rear head restraints (S60/S80)
There are solenoids on the rear head restraints if the car has electrically folding head restraints (not the center rear seat). The solenoids can fold the head restraints when reversing, for example. The solenoids are powered by the rear electronic module (REM).
The head restraints are folded using a switch on the lower section of the climate control module (CCM). The head restraints fold down when the switch is pressed. The head restraints fold back up manually.
There are diagnostics for the switch via the climate control module (CCM).
Cargo compartment lighting (S60/S80/XC90)
There are lamps in the cargo compartment. There are two lamps in the S60/S80. These are on the left and right-hand sides of the cargo compartment panels. In the XC90 there is a lamp in the trunk lid. The lamps light when the trunk lid is open. The cargo compartment lighting is powered directly from the rear electronic module (REM).
There are diagnostics for the cargo compartment lighting.
Rear 12V socket (V70/XC70/XC90)
There is a 12V socket on the right-hand side of the cargo compartment. This socket can be used to power a number of accessories.
The socket is directly connected to the 30-supply via a fuse on the rear electronic module (REM).
The rear electronic module (REM) measures the power consumption and calculates an average value. This is compared with a limit value to determine if any power consuming component is connected.
This information is transmitted via the controller area network (CAN) to the driver information module (DIM) which displays a text message when a power consuming component is connected.
Parking assistance system (optional extra)
There is a parking assistance system to assist parking. The parking assistance system consists of:
- four parking sensors in the rear bumper
- four parking sensors in the front bumper (option)
- the parking assistance module (PAM) under the rear relay box.
The parking assistance module (PAM) communicates with the rear electronic module (REM) using serial communication. The signals transmitted contain information about status and diagnostics. The sensors are directly connected to the parking assistance module (PAM). The sensors are also powered via the parking assistance module (PAM).
The parking assistance module (PAM) is powered and grounded via the rear electronic module (REM).
The parking assistance system is activated via a switch on the dashboard environment panel for the climate control module (CCM). An LED lights in the switch when the system is active.
The rear sensors detect objects within 1.5 meters if back-up (reverse) gear is selected. There is a beeping noise from the rear loudspeakers. The sound intensifies as the vehicle gets nearer to the object. The sound is constant from approximately 30 cm.
The front sensors (option) detect objects within 0.8 meters if back-up gear is selected or if the car is driven forwards at a speed below 10 km/h. There is a beeping sound from one of the front loudspeakers. The sound intensifies as the vehicle gets nearer to the object. The sound is constant from approximately 30 cm.
In the event of a fault in the parking assistance module (PAM) or sensors, the general warning lamp in the driver information module (DIM) lights and a text message is displayed.
The parking assistance system can be temporarily deactivated at lower speeds. This is done manually using a switch on the dashboard environment panel for the climate control module (CCM). The LED in the switch goes out when the system is deactivated.
There are diagnostics for the parking assistance system
Tow hitch (optional extra)
The trailer module (TRM) manages the electrical connection between the vehicle and the trailer. The trailer module (TRM) is directly connected to the rear electronic module (REM).
The primary task of the trailer module (TRM) is to manage output signals to the tow hitch cable harness for:
- Turn signal lamps
- Brake light
- Parking lamps
- Fog lamps.
The rear electronic module (REM) transmits the following voltages to the electrical socket for the tow hitch:
- Back-up lamp
- +12V voltage
- +12V supply.
Rear window lift mechanisms
The rear side windows are operated by motors in the doors. The switches for operating the windows are in the door panels. The windows can also be operated from the driver's door module (DDM).
The function is controlled by five relays inside the rear electronic module (REM). Depending on whether the control switch is moved up or down, the relays are activated to carry out the requested operation.
Two relays guide the window up on the right and left-hand sides. Two other relays lower the window. A further relay controls the power supply.
When operated from the driver's position, information is transmitted via the controller area network (CAN) from the driver's door module (DDM) to the rear electronic module (REM) which sends out signals to the relays.