Design

Design

Control module




The traffic message channel module (TMC) stores a list of the stations (or frequencies) found during the most recent search. When started, the control module tunes to the last set station. If there is no information about the station, the control module will search automatically starting at 99.4 MHz. If a new TMC station is found that is not already in the list, this station is stored automatically.
If the signal from the present frequency does not contain any RDS data, the control module will automatically begin a new search. The search continues until a station is found which transmits traffic messages. If the control module does not find any TMC stations, the control module returns to the last set frequency.
Automatic searching only takes place if none of the stations in the stored list have better reception than the station currently tuned in. During automatic searching, the list of saved stations is erased and a new list is created. Automatic searching may take up to 10 minutes.
The traffic message channel module (TMC) is controlled via the menu system in the multimedia module (MMM).
When the ignition is switched off the power consumption of the traffic message channel module (TMC) and antenna must not exceed 0.1 mA.
The system can endure temperatures between -40 °C and 85 °C.
The control module checks the input and output signals through an integrated diagnostic system.
The control module communicates with directly connected components, and via MOST communication.

Antenna

C30/S40/V50





C70




On the S40 a combined AM/FM (main and sub) and TMC-antenna is used. The antenna is integrated in the rear windshield.
There are two antennas on C30/V50.
There is a combined AM/FM main antenna integrated in the right door window. There is also an antenna for FMsub, which s a combined FMsub/TMC antenna integrated in the rear window.
On the C70 there are two antennas. A combined AM/FM rod antenna, which is integrated on the rear right-hand side. An FMsub antenna, which is a combined FMsub/TMC antenna and is behind the bumper.
The frequency range of the antenna is 87.5 - 108.0 MHz.
The signals from the antenna are amplified or adjusted by an antenna amplifier.
The antenna amplifier transmits TMC/FM sub-signals on to the Traffic message channel module (TMC). The FM sub-signals are then transmitted to the AM/FM tuner module (AFM) (applies to vehicles with structure week up to and including 200445) or Integrated Audio Module (IAM) (applies to vehicles with structure week from and including 200446).