Satellite Digital Audio Radio (SDAR) Control Unit, Component Description - GF82.85-P-3121RDU
Model 172.4
up to model year 2017
with code 536 (Sirius satellite radio complete system)
Shown on model 172.4
Location
The Satellite Digital Audio Radio (SDAR) control unit is located in the trunk on the left side behind the paneling on a bracket.
Tasks
The Satellite Digital Audio Radio (SDAR) control unit has the following tasks:
- Receive signals
- Amplifying and decoding signals
- Transmitting signals
Receive signals
Signals are read in via the following connections:
- Direct line
- Media Oriented System Transport (MOST)
Direct lines
- Circuit 30g
- Circuit 31
- Wake-up
- Multifunction antenna (A28/11) (for satellite signals and terrestrial signals)
MOST
- Control signals from audio equipment
Amplifying and decoding signals
The Satellite Digital Audio Radio (SDAR) control unit decodes and amplifies the satellite signals (Time For Division Multiplex (TDM)) and terrestrial signals (Coded Orthogonal Frequency Division Multiplex (COFDM)) into PCM signals (pulse mode modulation).
Transmitting signals
The signals are transmitted via the following connections:
- Direct line
- MOST
Direct line
- Multifunction antenna (power supply of antenna via signal line)
MOST
- Audio signals to the sound system amplifier control unit (N40/3) (with CODE 810 (Sound system)) or the audio equipment (except CODE 810 (Sound system))
- Status of Satellite Digital Audio Radio (SDAR) control unit, program-specific supplemental information (e.g. artist, track name and composer) as well as music genre (e.g. "ROCK", "NEWS") to the audio equipment
- Demodulated and decoded digital S-band satellite and S-band terrestrial signals as digital traffic and weather data signals to the navigation processor integrated into the COMAND controller unit (A40/3)
| Wiring diagram for satellite digital audio radio system control unit (SDAR) | N87/5 | PE82.60-P-2301-97TAA |