XC90 AWD V8-4.4L VIN 85 B8444S (2005)
the gyro in the multimedia module (MMM)
the back-up gear position
the GPS antenna
the map matching function.
Information from the gyro and wheel rotation counter can be used for dead reckoning (i.e. to calculate the position). This happens for example when
communication with the GPS satellites is lost such as when traveling through a tunnel.
The multimedia module (MMM) receives traffic information messages (TMC) from the antenna module (ATM) via the MOST network. This
information is displayed on the directly connected display screen. The traffic message channel (TMC) is a standardized code system for traffic messages.
It provides information about road works, heavy traffic etc. The Japanese equivalent of TMC is called FM multiplex. This system is not available in the
The navigation function also includes voice guiding which instructs the driving how to reach the set destination.
The user can configure certain functions in the system settings. These functions are:
date and time
user settings, such as password.
The following functions are displayed on the directly connected display screen:
The control module transmits all the signals required to control the display screen.
The multimedia module (MMM) uses the Windows CE operating system.
Functions such as Mobile office, system settings and navigation are presented on a 6.5" display screen in the center of the dashboard. The display screen
is directly connected to the multimedia module (MMM). The control module transmits all the signals required to control the display screen.
If there is an internal fault in the screen or faults in communication with the control module, the quality of the display on the screen will deteriorate or the
screen will stop working completely. A simple way to detect a fault in the screen, or communication problems between the screen and the control
module, is to check the appearance of the image on screen.
The menu system on the display screen can be controlled either using the navigation buttons on the reverse of the steering wheel or using the screen
remote control. The infra-red receiver for the remote control is on the infotainment control module (ICM).
Menu control of the multimedia module (MMM)
The on-screen menu can be controlled using the buttons on the reverse of the steering wheel.
The buttons consists of:
a Back button
an Enter button
a navigation button which is used to move the cursor up, down, left and right on the screen.
These commands are transmitted from the steering wheel module (SWM) (3/130) to the infotainment control module (ICM) (16/1) via the Controller
area network (CAN). The infotainment control module (ICM) converts the electrical signal to an optical signal and sends it onwards to the multimedia
module (MMM) (16/108) via the MOST network.
The remote control for the multimedia module (MMM) has the same functions as the steering wheel buttons. The remote control can be used to control
the menus on the display screen. An infra-red signal is transmitted from the remote control to an infra-red receiver on the infotainment control module
(ICM), which in turn sends the signal on to the multimedia module (MMM) on the MOST network.