Alarm Volvo V70 II

Alarm

See VIDA Design and Function, Alarm.

See VIDA Design and Function, Central locking.

Scheme 620

The fuel level is gauged by the fuel level sensors (7/130, 7/143). The signals from the sensors are transmitted to the rear electronic module (REM) (4/58). The rear electronic module (REM) calculates the quantity of fuel remaining by comparing the signals with a tank table stored in the rear electronic module (REM). Information about the quantity of fuel is transmitted via the Control area network (CAN) to the driver information module (DIM) (5/1) where the fuel level is displayed on the fuel gauge.

Scheme 621

The fuel level in the gasoline tank is measured by the fuel level sensor (7/143). The level in the gas tank is measured by the fuel level sensor (7/156) (CNG) or (7/153) (LPG). The signals from the sensors are transmitted to the rear electronic module (REM) (4/58).

The rear electronic module (REM) calculates the quantity of fuel remaining in each tank and transmits this information via the Control area network (CAN) to the driver information module (DIM) (5/1). The driver information module (DIM) also receives data via the Control area network (CAN) from the engine control module (ECM) (4/46) indicating which type of fuel the car is running on. The gas level in the tank is displayed via the fuel gauge. The gasoline fuel level is displayed in the text window in the driver information module (DIM).

Scheme 622

The rear electronic module (REM) (4/58) controls the shut-off valves, (8/88-90) (CNG) and (8/76) (LPG), via a directly connected relay (2/140) which supplies the valves with power when they should be open.

The rear electronic module (REM) receives information via the control area network (CAN) from the engine control module (ECM) (4/46) indicating that the car should run on gas/LPG. The rear electronic module (REM) also receives information via the control area network (CAN) from the central electronic module (CEM) (4/56) indicating the position of the ignition and data about collision status. When the ignition is on and no collision has been registered, the rear electronic module (REM) activates the relay, which supplies the valves with power.

The rear electronic module (REM) deactivates the relay in the following cases

1. there is a signal from the engine control module (ECM) indicating that gasoline operation has been selected
2. ignition off
3. the collision status changes
4. there is a fault in the communication on the controller area network (CAN).

The relay can be activated via a diagnostic command to, for example, allow the tank to be drained. Activation is carried out in VIDA via the vehicle communication socket. See function group 3, Rear Electronic Module (REM).

Scheme 623

The rear electronic module (REM) (4/58) controls warming up the diesel filter.

The rear electronic module (REM) checks that the conditions to start the diesel filter have been met. The following is transmitted on the controller area network (CAN)

1. the engine control module (ECM) (4/46) sends a signal indicating that the engine is running
2. the central electronic module (CEM) (4/56) transmits a signal indicating the position of the ignition key. The key must be in position II.

When the conditions are met, the rear electronic module (REM) grounds the output for relay 2/142. There is a temperature switch (8/85) on the relay circuit which closes at approximately -3 °C and then activates the relay. The temperature switch switches off at approximately 5 °C which breaks the power supply by releasing the relay. The diesel filter (9/38) is then supplied with power via the relay.

Scheme 624

The rear fog lamps (10/46, 10/53) are activated by pressing the button for the rear fog lamps in the lamp switch module (3/111). The light switch module (LSM) transmits a request to light the lamps to the central electronic module (CEM) (4/56) using serial communication. The central electronic module (CEM) transmits the request to the rear electronic module (REM) (4/58) via the Controller area network (CAN). The rear electronic module (REM) activates the relay (2/49) and the lamps are supplied with power via the relay.

Central Electronic Module (CEM) transmits information

1. back to the light switch module (LSM) to light the LED in the button
2. via the Controller area network (CAN) to the driver information module (DIM) (5/1) to light the indicator lamp for the rear fog lamps.

Information about the lamp circuit is obtained by the rear electronic module (REM) via a shunt (20/29). The rear electronic module (REM) sends the status of the lamp fault via the Control area network (CAN) to the central electronic module (CEM). In the event of a fault, the central electronic module (CEM) transmits data via the Control area network (CAN) to the driver information module (DIM) which displays a text message.

Scheme 625

Manual transmissions

The back-up (reversing) lamps (10/48, 10/55) are activated when back-up (reverse) gear is selected. The switch (3/10) on the transmission is then closed. A directly connected signal is transmitted to the central electronic module (CEM) (4/56) indicating that back-up (reverse) gear is selected. The central electronic module (CEM) transmits the information via the controller area network (CAN) to the rear electronic module (REM) (4/58) to activate the back-up lamps. The rear electronic module (REM) activates the relay (2/80) and the lamps are supplied with power via the relay.

Automatic transmission

The back-up (reversing) lamps (10/48, 10/55) are activated when back-up (reverse) gear is selected. The transmission control module (TCM) (4/28) transmits information via the Control area network (CAN) to the central electronic module (CEM) (4/56) indicating that back-up (reverse) gear is selected. The central electronic module (CEM) transmits the information via the controller area network (CAN) to the rear electronic module (REM) (4/58) to activate the back-up lamps. The rear electronic module (REM) activates the relay (2/80) and the lamps are supplied with power via the relay.

Scheme 626

The stop lamps (10/43, 10/50) are activated when the brake switch is (3/9) closed. A directly connected signal is transmitted via the central electronic module (CEM) (4/56) to the rear electronic module (REM) (4/58) and activates the relay (2/79). The lamps are powered via the relay. The central electronic module (CEM) transmits the data via the Controller area network (CAN) to the rear electronic module (REM) indicating that the stop lamp switch is activated. Information about the lamp circuit is obtained by the rear electronic module (REM) via a shunt (20/31). The rear electronic module (REM) sends status information for the lamp fault via the Control area network (CAN) to the central electronic module (CEM). In the event of a fault, the central electronic module (CEM) transmits data via the Control area network (CAN) to the driver information module (DIM) (5/1) which displays a text message.

Scheme 627

When the stop lamp switch (3/9) is closed, a signal is transmitted to the central electronic module (CEM) (4/56). The signal is transmitted from the central electronic module (CEM) to the rear electronic module (REM) (4/58) via a directly connected cable. The high mounted stop lamp is supplied with power directly from the rear electronic module (REM). The stop lamp is supplied with power for as long as the stop lamp switch is closed.

Scheme 628

Rear demist (9/2) is activated by pressing the switch on the climate control module (CCM) (3/112). The climate control module (CCM) transmits the data via the Control area network (CAN) to the central electronic module (CEM) (4/56). The central electronic module (CEM) checks that the conditions to start the demist have been met. If the conditions are met, a request is sent via the Control area network (CAN) to the rear electronic module (REM) (4/58) to activate the relay (2/82). The rear electronic module (REM) powers the relay and the demister is powered.

The central electronic module (CEM) also transmits a request via the Control area network (CAN) back to the climate control module (CCM) to light the LED in the switch.

Scheme 629

When a power consuming component is connected to the rear 12V socket (17/19), the power consumption is measured via a directly connected shunt (20/39) on the rear electronic module (REM) (4/58). The rear electronic module (REM) transmits status data via the control area network (CAN) to the driver information module (DIM) (5/1) which displays a text message (applies only to factory mounted 12V sockets).

The text message is also displayed if a power consuming component is connected when changing from ignition position

1. II to I
2. I to 0 and
3. 0 to the key is removed.

There is also an audible warning note when the key is removed.

Scheme 630

The back-up (reverse) warning system is activated by pressing the switch on the climate control module (CCM) (3/112). Information about the position of the switch is sent via the Control area network (CAN) to the rear electronic module (REM) (4/58). When back-up (reverse) warning is selected, this is confirmed by the rear electronic module (REM) sending a signal back to the climate control module (CCM) to light the LED in the switch.

The rear electronic module (REM) also receives information via the Control area network (CAN) from the central electronic module (CEM) (4/56) about

1. the key position and
2. that back-up (reverse) gear is selected.

The parking assistance system can detect nearby objects when the ignition is on in position II and back-up gear (R) is selected. The parking assistance system is deactivated automatically when the gear selector lever is moved from (R) to any other position.

When the conditions for activating the back-up (reverse) warning are met, the rear electronic module (REM) sends data via serial communication to the parking assistance module (PAM) (4/86). The parking assistance module (PAM) receives signals from the back-up (reversing) warning sensors. The parking assistance module (PAM) sends the signal when there is an object within 1.5 meters of the rear of the car.

Scheme 631

The rear electronic module (REM) handles functions for

1. alarm (certain functions)
2. locks (certain functions)
3. inclination sensor module (ISM)
4. headlamp range adjustment position sensors (Bi-Xenon)
5. fuel level (Gasoline/Diesel)
6. fuel level (Bi-fuel)
7. shut-off valve (Bi-fuel)
8. diesel filter preheating (Diesel)
9. rear fog lamps
10. back-up lamp
11. stop lamps
12. high level stop lamps
13. rear windshield wiper/washers
14. rear demist
15. cargo compartment lighting
16. rear 12 V socket)

The control module is installed as a separate unit in the rear relay box. This is under the left-hand cargo compartment panel.

The rear electronic module (REM) communicates with components which are directly connected and also with other control modules and components via serial communication and the control area network (CAN).

The control module checks activations and input and output signals using an integrated diagnostic system A diagnostic trouble code (DTC) is stored if the control module detects an error. In certain cases the control module replaces the faulty signal with a substitute value.

Any diagnostic trouble codes (DTCs) are stored in the control module memory. This information can be read off using VIDA via the data link connector (DLC) in the car.

Lock and unlock the rear doors to check whether the rear electronic module (REM) is grounded and powered. The control module is powered and grounded if the doors lock and unlock. Another way to check whether the rear electronic module (REM) is powered and grounded is to switch on the rear fog lamp.

For further information, also see the relevant Signal specifications.

The following chart summarizes input signals to and output signals from the rear electronic module (REM). The signal types are divided into directly connected signals, serial communication and controller area network (CAN) communication. The illustration below displays the same information with the Volvo component designations.

Scheme 632

See VIDA Design and Function, Alarm.

See VIDA Design and Function, Central locking.