SDARS Radio Systems
Radio Systems
- "Concert"
- "Symphony"
The radio systems are prepared for satellite radio -R146- use or satellite radio is installed.
Radio generation II+ introduced from KW 22/06.
This uses two internal tuners with "phase diversity" for reception.
Further removal steps are the same as with the "symphony" radio.
Besides switching diversity, "phase diversity" is the second procedure for reducing reception interference.
At least two antennas with an amplifier and a radio -R- with two tuners are required.
If the signal received is interrupted, both signals are digitalized and separated in the tuners in the radio so that the disrupted signals are blocked out as much as possible.
If the reception signal is not disrupted, the radio constantly compares which antenna (amplifier) has the strongest reception. This is then transferred.
In this case, the second tuner checks the frequency band in the background for better reception frequencies for the selected station. If a better signal is found, this tuner switches to reception and the other to the background.
Speaker Systems
- Active speakers (rear speakers use Amplifier/Woofer (in left rear luggage compartment) -R44-)
- BOSE sound
General Information
Communication with other vehicle systems takes place via the Infotainment CAN-Bus and Data Bus On Board Diagnostic Interface -J533-.
Fault finding is performed via "Guided Fault Finding" using the Vehicle Diagnosis, Testing & Information SystemVAS5051.
Repairs on antenna wires, refer to ANTENNA WIRES, REPAIRING .
Repair to CAN bus lines, refer to CAN BUS WIRE, REPAIRING .
Transport Mode in "Symphony II+"
The "symphony" generation II+ has a special protection lock for the internal CD changer.
This is active when the unit is shifted and must be deactivated after installation.
In the same way, the transport protection must be activated before removing the unit.
Transportation mode, activating and deactivating, refer to RADIO, SYMPHONY II+ IN TRANSPORT MODE, ACTIVATING/DEACTIVATING .