DOWNLOADING SOFTWARE AND REPLACING THE CONTROL MODULE
New software can be downloaded into the steering wheel module (SWM). When ordering software, the hardware and the software in the car is compared to the data in 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 integrated in the steering wheel bracket. The steering wheel must be removed to replace the control module.
Scheme 71
The left-hand control stalk is used to control the trip computer and to display and erase text messages in the driver information module (DIM) (5/1). The steering wheel module (SWM) (3/130) transmits information to the driver information module (DIM) on the Control area network (CAN) indicating which function is selected.
The trip computer menu is controlled using the ring on the left-hand control stalk. Turn the ring forwards or backwards to scroll through the menu one step at a time. Some menu selections, such as average speed and fuel consumption, can be reset using the RESET button.
Error messages displayed in the driver information module display are erased using the READ button.
Scheme 72
The steering wheel module (SWM) has the task of managing the signals for those functions which can be controlled via the steering wheel control stalks and buttons. The signals are transmitted to the relevant control modules via the control area network (CAN). The actual functions are not in the steering wheel module (SWM).
The steering wheel module (SWM) manages the control signals for the following functions
- Volume control and CD track / radio selection
- Volume control during hands free carphone calls and menu selection for the phone module (PHM)
- Menu selection for traffic information
- Front windshield wipers/washers
- Rear windshield wiper/washer (V70, V70XC/XC70 and XC90)
- Cruise control
- Turn signal lamps
- High and low beam
- Trip computer and displaying / erasing text messages in the driver information module (DIM).
The control module is integrated in the steering wheel bracket. The steering wheel must be removed to replace the control module. Control stalks, key pads and switches can be replaced as separate units.
Cars with DSTC also have a steering wheel angle sensor installed in the contact reel in the steering wheel module (SWM).
The steering wheel module (SWM) communicates with directly connected components and communicates with other control modules via the Control Area Network (CAN).
The control module checks activations and input and output signals via 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 signal.
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.
A simple way to ensure that the steering wheel module (SWM) is powered and grounded is to flash the headlamp high beam or to change the audio or carphone volume.
The table below summarizes the input signals to and output signals from the steering wheel module (SWM). 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.
| Input signals | Output signals |
|---|---|
| Via serial communication | Via serial communication |
| Steering wheel buttons, digital signal from the buttons to the steering wheel module (SWM): Cruise control control unit (3/4) Audio/carphone switch (3/131) RTI switch (3/135). | |
| Via Controller Area Network (CAN) communication | Via Controller Area Network (CAN) communication |
| Central electronic module (CEM) (4/56). | Engine control module (ECM) (4/46) Transmission control module (TCM) (4/28) Upper electronic module (UEM) (4/70) Accessory electronic module (AEM) (4/78) (optional equipment) Audio module (AUM) 16/1 (optional equipment, not XC90) Central electronic module (CEM) (4/56) Driver information module (DIM) (5/1) Phone module (PHM) (16/60) (optional equipment) Rear electronic module (REM) (4/58) Road traffic information module (RTI) (16/45) (optional equipment, not XC90) Infotainment Control Module (ICM) (16/1) (XC90 only). |
Scheme 73
Scheme 74
The subwoofer module (SUB) consists of two components
- a loudspeaker element
- an amplifier.
The loudspeaker element is an 8 inch bass loudspeaker with two sound axes. The impedance is 4 ohms for each sound axis.
The amplifier has two channels, one for each sound axis. The output from each channel on the amplifier is 70 W at 4 ohms. Power booster amplification is set so that the acoustic output from the subwoofer module (SUB) matches the other loudspeaker channels.
When transferring sound signals to the subwoofer module (SUB), the infotainment control module (ICM) allocates a channel on the MOST network. The audio module (AUD) transmits sound signals to the subwoofer module (SUB) via the MOST network. All filtering and sound treatment of the sound signal takes place in the audio module (AUD). Volume control takes place in the Subwoofer module (SUB).
The volume of the Subwoofer module (SUB) is raised or lowered using the volume knob on the infotainment control module (ICM). The infotainment control module (ICM) transmits a request on the MOST network to the subwoofer module (SUB), which then processes the request and actively raises or lowers the volume.
The limiter function in the subwoofer module (SUB) does not permit an increase in the output level if this leads to a fall in sound quality.
The subwoofer module (SUB) is supplied with power by one of the relays in the rear electronic module (REM).
This function can be used to read parameters, status identifiers and counters stored at the same time as a diagnostic trouble code (DTC). These are called frozen values.
For further information, see DESCRIPTION OF VEHICLE COMMUNICATION INFORMATION .
New software can be downloaded into the subwoofer module (SUB). When ordering software, the hardware and the software in the car is compared to the information in 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 located on the left-hand side behind the third row of seats.
After replacing the control module, the unique serial numbers of the control module are checked by the infotainment control module (ICM). The installed control module will not work if the serial number is incorrect.
Try turning the ignition off and on if there are problems after the software is downloaded and the control module is not working.
The MOST network is used for a total software reload.
For further information about the function of the subwoofer module (SUB), see Design and Function, audio module (AUD) in MEDIA, COMMUNICATION AND NAVIGATION - DESIGN AND FUNCTION