Digital Audio Broadcasting (DAB), function - GF82.60-P-3020LE
MODEL 216, 221 with CODE (537) Digital radio as of model year 2009/YoM 08
Function requirements, general
- Circuit 30g ON
- The DAB L-band antenna (A2/49a5) (model 221) or DAB L-band antenna (A95/1) (model 216) and the rear window antenna amplifier module (A2/12) are operating correctly
The DAB L-band antenna in model 221 is integrated into the telephone and GPS roof antenna (A2/49).
Digital Audio Broadcasting (Digital Radio) (DAB), general
The Digital Audio Broadcasting control unit (N87/3) allows reception of stations in DAB format.
DAB offers the following advantages:
- Reliable and static-free reception of radio stations
- Reception of international radio stations
- High sound quality
- Future-safe by multimedia capability
DAB enables a number of programs, known as an "ensemble", to be received over one frequency.
An "ensemble" can consist of up to 12 programs.
Up to 64 frequencies are available for DAB.
In the United Kingdom, up to 7 of these frequencies can be received simultaneously; generally the number is 2 to 3 frequencies. Each program can have subprograms (e.g. news announcement, summary of events.).
Only the "ensemble name", not the frequency, is displayed for the individual "ensembles".
The DAB functions are controlled by the COMAND controller unit (A40/3).
The DAB functions are controlled assisted by menus using one of the following controls:
- Front central operating unit (A40/9)
- Left multifunction steering wheel button group (S110) and right multifunction steering wheel button group (S111)
It is only possible to select stations in the memory list or station list with the multifunction steering wheel button groups. A change in "Ensembles" can only be made using the control buttons on the front central operating unit.
The menu system is displayed by the COMAND controller unit in the COMAND display (A40/8) (without code (867) SPLITVIEW) or in the SPLITVIEW display (A40/10) (with code (867) SPLITVIEW). The control signals from the front central operating unit are transmitted to the COMAND controller unit via the telematics CAN (CAN A).
The control signals of the multifunction steering wheel button groups are transferred to the COMAND control unit over the following path:
- Steering LIN (LIN E1)
- Steering column tube module (N80)
- Chassis CAN (CAN E)
- Central gateway control unit (N93)
- Central CAN (CAN F)
The COMAND controller unit transmits the corresponding signals over MOST to the Digital Audio Broadcasting control unit.
Function sequence for DAB radio
The DAB L-band antenna receives the DAB L-band signals for the local broadcasts, usually from conurbation stations.
The rear window antenna amplifier module receives DAB band III signals via the rear window antenna structures for large-area provision, usually from stations with a large range or national stations.
These signals are forwarded to the Digital Audio Broadcasting control unit using coaxial cables.
The Digital Audio Broadcasting control unit decodes the signals and transmits them in the form of pulse code modulation signals via MOST to the audio tuner control unit (N93/1).
The audio tuner control unit processes the received signals accordingly, amplifies them and outputs the audio signals over the vehicle's speaker system.
On model 221 as of 1.9.10 (with code (811) Advanced Sound System) the audio tuner control unit only functions as a radio tuner and it does not actuate any speakers. Audio output here is through the digital sound processor (A2/69) and the sound amplifier (A2/13).
Audio output in model 216 is through the following components:
- Left door rear speaker (H4/3)
- Right door rear speaker (H4/4)
- Bass module speaker (H4/17)
- Center cockpit speaker (centerfill) (H4/27)
- Left rear surround speaker (H4/54)
- Right rear surround speaker (H4/57)
- Left door Sound tweeter (H4/68)
- Right door Sound tweeter (H4/69)
- Left door Sound woofer and midrange speaker group (H4/72)
- Right door Sound woofer and midrange speaker group (H4/73)
Audio output in model 221 with code (810) Sound system is through the following components:
- Left rear door speaker group (H4/3)
- Right rear door speaker group (H4/4)
- Bass module speaker
- Center cockpit speaker (centerfill)
- Left rear surround speaker
- Right rear surround speaker
- Left front door Sound tweeter (H4/68)
- Right front door Sound tweeter (H4/69)
- Left front door Sound woofer and midrange speaker group (H4/72)
- Right front door Sound woofer and midrange speaker group (H4/73)
Audio output in model 221 (as of 1.9.10) with code (811) Advanced Sound System is through the following components:
- Speaker Left front door (H4/5)
- Right front door speaker (H4/6)
- Bass module speaker
- Center cockpit speaker (centerfill)
- Left front door tweeter (H4/33)
- Right front door tweeter (H4/34)
- Left rear door tweeter (H4/35)
- Right rear door tweeter (H4/36)
- Left rear surround speaker
- Right rear surround speaker
- Left front door woofer (H4/64)
- Right front door woofer (H4/65)
- Left rear door woofer (H4/66)
- Right rear door woofer (H4/67)
The woofers and bass box speaker on model 221 (as of 1.9.10) with code (811) Advanced Sound System are actuated by the sound amplifier, which is controlled by the digital sound processor.
| Electrical function diagram for Digital Audio Broadcasting, function | Model 216 | PE82.60-P-2057-97CAA | |
| Model 221 | PE82.60-P-2057-97SAA | ||
| Digital sound processor, component description | A2/69 Model 221 as of YoM 10 with code (811) Advanced Sound System |
GF82.62-P-5011LE | |
| Component description for COMAND controller unit | A40/3 With code (526) COMAND with single DVD drive (without navigation) or with code (527) COMAND APS with single DVD drive (with navigation) |
GF82.85-P-3136LE | |
| COMAND display, component description | A40/8 Without code (867) SPLITVIEW |
GF54.30-P-6110LE | |
| Front central operating unit, component description | A40/9 | GF54.21-P-4500LE | |
| SPLITVIEW display, component description | A40/10 With code (867) SPLITVIEW |
GF54.30-P-6120LE | |
| Component description for Digital Audio Broadcasting control unit | N87/3 | GF82.62-P-5000LE | |
| Audio tuner control unit, component description | N93/1 Without code (810) Sound system and without code (811) Advanced Sound System |
GF82.62-P-3132LE | |
| With code (810) Sound system Model 221 as of YoM 10 with code (811) Advanced Sound System |
GF82.62-P-3132LES |