Reading off and programming data Volvo V70 II рестайлинг

Reading off and programming data

This function allows programmed data to be read off or data such as customer parameters to be programmed in.

Note. If possible, all data must be read out from the control module before replacement. After replacement the relevant data must be programmed into the new control module.

Customer parameters can be programmed for approach lights, seat heaters, post drying and daytime running lamps.

Seat heater: First read off the data that is programmed in the central electronic module (CEM). Answer, for example, 37C. Then enter the temperature desired by the customer, for example 41C. After programming, the new data must be saved in the control module memory. The following values can be programmed in: 0, 10C, 28C, 30C, 31C, 32C, 33C, 34C, 35C, 36C, 37C, 38C, 39C, 40C, 41C, 43C. The left and right-hand seats are programmed individually and there are two settings that can be selected by the customer, high or low.

Approach lights: First read off the data that is programmed in the central electronic module (CEM). Answer, for example, 30 seconds. Then enter the time desired by the customer, for example 90 seconds). After programming, the new data must be saved in the control module memory. The following values can be programmed in: 0, 30, 60 and 90 seconds.

Post drying: First read off the parameters programmed in the central electronic module (CEM). Reply for example the function is not set. Then enter if the customer wants post drying (the function is set). After programming, the new parameters must be saved to the control module memory. The following values can be entered: Off or on.

Daytime running lamps: First read off the data that is programmed in the central electronic module (CEM). For example, daytime running lamps off. Then enter if the vehicle is to have daytime running lamps (daytime running lamps on). After programming, the new data must be saved in the control module memory. The following values can be programmed in: Off or on. There are two versions of off. Dipped headlamps can be switched on in all light switch positions apart from the P position. The dipped headlamp beam can also be adjusted.

New software can be downloaded into the central electronic module. When ordering software, the hardware and the software in the car is compared to the Volvo central database. If the comparison is OK the software is downloaded to the control module.

If the comparison between the car and Volvo central database is not OK, the database is updated with the car configuration. When this is complete the software is downloaded.

The control module is in a relay box under the soundproofing panel on the driver's side. The control module needs to be removed from the relay box to be replaced.

When installing a completely new central electronic module in the car, PIN codes for the central electronic module, immobilizer and transponder (key) are downloaded into the control module. The PIN codes are loaded automatically during the ordering process in VIDA. The PIN codes are retrieved from the Volvo Central Database and sent with the software package when software is ordered for the new control module. Each transponder key must however, be programmed as each key has a unique code which must be stored in the central electronic module.

Because of the unique PIN codes, the central electronic modules cannot be moved between cars.

Three customer parameters (four for the V70/V70XC) can be programmed into the central electronic module. These customer parameters are stored in the control module but not in the Volvo central database. This means that the customer parameters must be reprogrammed when the hardware is replaced.

The customer parameters which can be programmed are

Seat temperature

1. There are two values that can be programmed: low temperature and high temperature. Programming must be carried out so that the high temperature setting is higher than the low temperature setting.

Approach lights

1. The approach lights can be programmed to stay on for a longer or shorter time according to the wishes of the customer. The factory setting is 30 seconds. The time can be set to 0, 30, 60 or 90 seconds.

Daytime running lamps

1. The daytime running lamps can be programmed in three ways: Low beam in all switch positions except the parking light position (Flex zero) The light switch functioning on the basis of: off, parking light and low beam (Flex standard) Low beam always on regardless of the position of the light switch (Flex low).

Note. It is essential that the legal requirements of each country are followed.

Tailgate wiper (V70/V70XC)

1. The tailgate wiper function can be programmed in two ways: The tailgate wiper can only be activated manually The tailgate wiper can be activated automatically when back-up (reverse) gear is selected and the front wipers are activated.

See ALARM, IMMOBILIZER, AND VOLVO ON-CALL - DESIGN AND FUNCTION .

See System description/Design and Function .

See IMMOBILIZER (2001-2004) or IMMOBILIZER (2005-2007) .

Scheme 177

Depending on the position of the knob, the light switch module (LSM) (3/111) transmits information via serial communication to the central electronic module (CEM) to turn on low beam. The central electronic module (CEM) (4/56) then transmits a control signal to activate the low beam relay (2/62). The bulbs are then supplied with power.

To change to high beam, the left-hand control stalk is pulled towards the steering wheel. The control area network (CAN) signal from the steering wheel module (SWM) (3/130) is transmitted to the central electronic module (CEM) which activates the high beam relay (2/63) and supplies power to the high beam. For Bi-Xenon lamps, the position of the reflector is also changed so that the Xenon lamp is on at high beam.

The central electronic module (CEM) also transmits a CAN signal to the driver information module (DIM) (5/1) to light the indicator lamp for high beam.

There is a Limp Home function that ensures that low beam still works if there is a fault in the control area network (CAN). For Bi-Xenon lamps the beam is then set to the shortest range.

Scheme 178

The parking lamps (10/11-12, 10/17-18) and license plate lighting (10/3) lights when

1. The knob in the light switch module (LSM) (3/111) is in the low beam position
2. The knob in the light switch module (LSM) is in the parking lamp position
3. Low beam is lit via the low beam automatic function.

The lamp switch module (LSM) transmits data using serial communication to the central electronic module (CEM) (4/56) to activate the lamps.

The lamps are supplied with power via a relay (2/61) which is activated by the central electronic module (CEM). The license plate lighting, the front parking lamps (also on the front fenders for US models) are directly supplied with power. The rear parking lamps are supplied by two shunts (20/28, 20/33) on the rear electronic module (REM) (4/58) so that blown bulbs can be detected.

In the event of a bulb fault for the rear parking lamps, data is transmitted on the control area network (CAN) from the rear electronic module (REM) to the driver information module (DIM) (5/1) and a text message is displayed.

There is a Limp Home function for the parking lamps so that they will work even if there is a fault in the control area network (CAN) or in the serial communication between the light switch module (LSM) and the central electronic module (CEM).

Scheme 179

Headlamp range adjustment is controlled by the central electronic module (CEM) (4/56). The central electronic module (CEM) communicates with the light switch module (LSM) (3/111) using serial communication.

If the thumb wheel in the light switch module (LSM) is turned, information about the position of the wheel is transmitted to the central electronic module (CEM). The central electronic module (CEM) transmits a pulse width modulation (PWM) signal to the actuator motors (6/38-39) with the pulse ratio set according to the position of the thumb wheel. The headlamp range can be adjusted in 16 stages.

Scheme 180

Automatic headlamp range adjustment is controlled by the central electronic module (CEM) (4/56). The position sensor (7/120) on the rear suspension transmits signals to the rear electronic module (REM) (4/58) about the angle of the car in terms of the load conditions.

The rear electronic module (REM) transmits this data via the control area network (CAN) to the central electronic module (CEM) which compares the information with the table for the relevant model. The table is stored in the central electronic module (CEM).

The actuator motors (6/38-39) are then operated from the central electronic module (CEM) via a PWM signal, the pulse ratio of which depends on the angle the lamps need to be set to.

Scheme 181

The front fog lamps (10/5-6) are activated by pressing the button for the front fog lamps in the light switch module (LSM) (3/111). The light switch module (LSM) transmits data to the central electronic module (CEM) (4/56) to light the lamps. The central electronic module (CEM) activates the relay (2/34) and the bulbs are supplied with power via the relay.

Scheme 182

This function is controlled by the left control stalk. The steering wheel module (SWM) (3/130) sends data to the central electronic module (CEM) (4/56) to activate the turn signal lamps via the control area network (CAN). The central electronic module (CEM) transmits information to the driver information module (DIM) (5/1) to activate the turn signal indicator lamp and powers the turn signal lamp via a shunt (20/32, 20/34).

The power supply is pulsed and the turn signal lamps are activated 90 times per minute.

The hazard warning signal flasher is activated by closing the switch (3/6) and transmits a signal to the central electronic module (CEM) to start the function. The central electronic module (CEM) transmits a signal in the same way as above, but to both sides. The central electronic module (CEM) also transmits a signal to the bulb in the switch to indicate that the hazard warning signal flashers are on. If the ignition key is in position I or II, there is a clicking sound from the driver information module (DIM). If the ignition is switched off, there is no sound, but the hazard warning signal flashers continue to flash.

If a fault occurs with a lamp, the central electronic module (CEM) detects the reduction in power consumption and the frequency is doubled on the side where the fault occurred.

Scheme 183

When the stop lamp switch (3/9) is closed, a signal is transmitted to the central electronic module (CEM) (4/56). The high mounted stop lamp (10/19) is supplied with power directly from the central electronic module (CEM). The central electronic module (CEM) supplies power for as long as the stop lamp switch is closed.

Scheme 184

The courtesy lighting (10/122-123, 10/125-126), keyhole (16/65) and glove compartment lighting (10/29) are controlled via the central electronic module (CEM) (4/56). All other interior lighting is controlled by the upper electronic module (UEM) (4/70). The central electronic module (CEM) powers the lamps which it controls directly.

The lamps are powered if a door is opened (3/74-77), or when the upper electronic module (UEM) transmits a request via the control area network (CAN). The upper electronic module (UEM) transmits a request when it has received an unlock command from one of the remote controls. If a door is opened, the central electronic module (CEM) sends a control area network (CAN) signal to the upper electronic module (UEM) to light the lighting it controls.

The glove compartment lighting (10/29) is supplied with power directly from the central electronic module (CEM) when the switch by the lamp is activated when the glove compartment is opened.

Scheme 185

The horn is operated when the steering wheel module (SWM) (3/130) receives a signal from the switches (3/37) in the steering wheel. The steering wheel module (SWM) sends data to the central electronic module (CEM) (4/56) via the control area network (CAN) indicating that the switch is closed. The central electronic module (CEM) activates the relay (2/17) for power supply to the horn.

There is also a signal directly connected from the steering wheel module (SWM) to the central electronic module (CEM). This is used if there is a fault in the control area network (CAN). This is a Limp-Home function.

Scheme 186

Manual transmissions

The starter motor (6/25) is operated by turning the key in the ignition switch (3/1) to position III.

1. For transmissions with a clutch interlock (certain markets), a signal is transmitted from the ignition switch to the engine control module (ECM) (4/46). The engine control module (ECM) detects the position of the clutch pedal sensor (7/123). The engine control module (ECM) transmits data to the central electronic module (CEM) (4/56) via the control area network (CAN) about the position of the pedal. The central electronic module (CEM) requires a signal that the clutch is pressed down and that the key is in position III before it will send a signal to the relay (2/35). When the relay is activated, the solenoid in the starter motor is powered
2. For transmissions without clutch interlock, the central electronic module (CEM) (4/56) activates relay 2/35 and powers the solenoid in the starter motor (6/25).

The starter motor turns for as long as the key is in position III. If the engine has been started once, there is a Limp Home function so that the engine can be started again even if there is a fault in the control area network (CAN). This function is active for a brief period after the key is removed from the ignition switch. After this time the car will not start because there is no communication for the immobilizer between the central electronic module (CEM) and the engine control module (ECM).

Automatic transmission

The starter motor (6/25) is operated by turning the key in the ignition switch (3/1) to position III.

1. For transmission 4T65EV, a signal is transmitted from the gear-shift position sensor (3/71) via the transmission control module (TCM) (4/28) to the central electronic module (CEM) (4/56) indicating that the gear selector is in position P/N
2. For AW transmissions the signal is transmitted directly from the gear-shift position sensor to the central electronic module (CEM). The central electronic module (CEM) requires this signal and a signal indicating that the key is in position III before it will send a signal to the relay (2/35). When the relay is activated, the solenoid in the starter motor is powered.

The starter motor turns for as long as the key is in position III. If the engine has been started once, there is a Limp Home function so that the engine can be started again even if there is a fault in the control area network (CAN). This function is active for a brief period after the key is removed from the ignition switch. After this time the car will not start because there is no communication for the immobilizer between the central electronic module (CEM) and the engine control module (ECM).

Scheme 187

The rear window lift mechanisms are operated using switches (3/85-86) in the door panels. Relays 2/116 or 2/118 for the left-hand side and relays 2/117 or 2/119 for the right-hand side are activated in the central electronic module (CEM) (4/56) depending on whether the window is to move up or down.

When the window lift mechanisms are operated from the driver's position, data is transmitted from the driver's door module (3/126) via the control area network (CAN) to the central electronic module (CEM) which transmits a signal to the correct relay.

There is a switch in the driver's door module (DDM) to allow for child locking, where the windows can only be operated from the driver's position. When this is active, data is transmitted via the control area network (CAN) to the central electronic module (CEM) to disconnect relay 2/120. This breaks the circuit for the rear switches.

When the child lock is activated, the lighting in the rear switches goes out.

Scheme 188

The central electronic module (CEM) (4/56) receives a request from the engine control module (ECM) (4/46) via the control area network (CAN) to start the fuel pump (FP) (6/33). The central electronic module (CEM) then activates the relay (2/23) which supplies the fuel pump with power.

In the event of a collision in which the airbags are deployed, a signal is transmitted from the supplemental restraint system (SRS) module (4/9) via the control area network (CAN) to the central electronic module (CEM) which deactivates the relay for the fuel pump.

If the control area network (CAN) is not functioning, a pulsed signal to control the fuel pump (FP) is transmitted from the engine control module (ECM) to the central electronic module (CEM) via a directly connected cable.

Scheme 189

The right-hand control stalk is moved downwards through three positions to operate the windshield wipers. The steering wheel module (SWM) (3/130) transmits information via the control area network (CAN) to the central electronic module (CEM) (4/56) about the selected position. The central electronic module (CEM) then activates relay 2/91 which supplies the wiper motor (6/1) with power in position 1. If high speed wiping is selected, relay 2/90 is also activated to power the motor in position 2.

The central electronic module (CEM) receives a signal from the motor when the wipers are in the parked position so that the wipers can be stopped in the correct position.

For intermittent wiping, the process is the same as for low speed, but the time between each stroke is set using the ring on the control stalk to one of eight positions between 1 and 27 seconds. The central electronic module (CEM) controls this once it has received information about intermittent wiping from the steering wheel module (SWM) via the control area network (CAN).

The windshield and headlamps are washed when the right-hand control stalk is moved towards the steering wheel. The steering wheel module (SWM) transmits information to the central electronic module (CEM) via the Control area network (CAN) to activate washing. The central electronic module (CEM) activates the relay 2/92 which powers the pump motor (6/2) and wiper motors (6/3-4) for the headlamps.

The central electronic module (CEM) receives a signal from the level sensor (7/5) in the windshield washer reservoir so that it can check the windshield washer reservoir level. The switch in the level sensor closes if the level falls below one liter. The central electronic module (CEM) sends the signal to Driver information module (DIM) (5/1) via the controller area network (CAN). The driver information module (DIM) displays a text message indicating that the windshield washer fluid needs to be topped up.

The tailgate wiper (6/32) (V70/V70XC) is controlled by the rear electronic module (REM) (4/58). The rear electronic module (REM) receives a control area network (CAN) signal from the steering wheel module (SWM) via the central electronic module (CEM). The rear electronic module (REM) then powers relay 2/16 to start the tailgate wiper. The tailgate wiper is powered via relay 2/72.

The tailgate wiper can be programmed so that it is activated if the windshield wipers are on and back-up gear is selected.

Rear windshield cleaning is activated when the right-hand control stalk is pushed away from the steering wheel. The steering wheel module (SWM) sends signals via the control area network (CAN) to the central electronic module (CEM) to activate rear windshield washing. The central electronic module (CEM) activates relay 2/93 to power the pump motor (6/30). At the same time the rear electronic module (REM) activates the tailgate wiper.

The wipers only operate at low speed if there is a fault in the control area network (CAN). If this is the case, the central electronic module (CEM) receives a directly connected signal from the steering wheel module (SWM).

There is no Limp Home function for the rear windshield washer and wiper.

Scheme 190

The seat heaters are activated by pressing the switch to the right of the climate control module (CCM) (3/112). If the switch is pressed once, they are activated at high temperature. Pressing again will activate low temperature. Pressing a third time switches the heaters off.

The climate control module (CCM) transmits information via the control area network (CAN) to the central electronic module (CEM) (4/56) to activate the seat heaters. The central electronic module (CEM) sends back a signal to the climate control module (CCM) to light the LED in the button. The central electronic module (CEM) compares the signal from the climate control module (CCM) with the programmed value for high/low temperature and transmits a pulsed signal to the control module for the seat heater (9/12-13) about the requested temperature. The number of pulses determines the power at which the control module will operate the seat heater. The control module also compares the value from the thermistor so that it can detect faults in the heater pad.

Scheme 191

The central electronic module (CEM) (4/56) receives data from the engine control module (ECM) (4/46) via the control area network (CAN) that the engine is running and information from the ABS system (4/16) about the speed of the car. From model year 2001 the ABS module is called the brake control module (BCM). The central electronic module (CEM) then operates the stepper motor (6/71) via the four outputs to set the stepper motor to the correct servo assistance level.

The central electronic module (CEM) checks the signals. If a fault is detected, the servo assistance is set to normal (approx.70km/h) and the system is disengaged. The central electronic module (CEM) also transmits a signal to the driver information module (DIM) (5/1) via the control area network (CAN) which lights the general warning lamp and displays a text message.

Scheme 192

The central electronic module (CEM) controls the Controller area network (CAN) and acts as a bridge between the high and low speed networks and the data link connector (DLC). It also manages the following functions

1. Alarm (certain functions)
2. Locks (certain functions)
3. Immobilizer
4. Headlamps
5. Parking lights / license plate lighting
6. Front fog lamps
7. Headlamp range adjustment (certain markets)
8. Automatic range adjustment (Bi-Xenon)
9. Turn signal lamps
10. High-mounted stop lamp (S80/S60)
11. Courtesy lighting / key lighting / glove compartment lighting
12. Rear window lift mechanisms
13. Fuel pump
14. Wiper / washers for the windshield and headlamps
15. Starter motor
16. Speed sensitive power steering
17. Electrically heated seats
18. Horn.

The control module is installed as a separate unit in a relay box under the soundproofing panel on the driver's side. The control module is removed from the relay box for replacement.

The car configuration file is stored in the central electronic module (CEM). It contains information about the car VIN number, structure week and the equipment in the car. When replacing the central electronic module (CEM), the VIN cannot be read off until the software has been downloaded from the Volvo central database.

The central electronic module (CEM) 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 central electronic module (CEM) replaces the faulty signal with a substitute signal. Other control modules also communicate on the network with the central electronic module (CEM) if they have diagnostic trouble codes (DTCs) stored. This function is used when reading off diagnostic trouble codes (DTCs) without VIDA.

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.

The easiest way to check if the central electronic module (CEM) is grounded and receiving power is to activate the hazard warning signal flasher. The central electronic module (CEM) is supplied with power if the function operates. Another way of checking that the central electronic module (CEM) is supplied with voltage and grounded is to activate one of the rear window lift mechanisms.

For further information, also see Signals .

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

Scheme 193

Scheme 194

See ALARM, IMMOBILIZER, AND VOLVO ON-CALL - DESIGN AND FUNCTION .

See System description/Design and Function .

See IMMOBILIZER (2001-2004) or IMMOBILIZER (2005-2007) .

Scheme 195

See ALTERNATOR AND REGULATOR - DESIGN AND FUNCTION .