MOST Audio Gateway

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Function

Vehicles after 01/09/2003 have MOST-connected Audio Gateway (AGW) installed in the trunk. AGW acts as a radio tuner, MOST master and sound amplifier (unless vehicle has option code 810 - SOUND SYSTEM).

Location

W220 A2208702889 top.jpg W220 A2208702889 speaker side.jpg W220 A2208702889 antenna side.jpg W220 A2208702889 label.jpg

Part Numbers

For all vehicles, except those with option code 529 - COMAND DVD JAPAN WITH NAVIGATION and 530 - COMAND DVD APS USA WITH NAVIGATION:

Part No. Notes
A2208271142 To date 20/01/2004
A2208701789 From date 20/01/2004 (replaced by A2208702889)
A2208702889 From date 20/01/2004

For vehicles with option code 530 - COMAND DVD APS USA WITH NAVIGATION, 625 - VERSION FOR AUSTRALIA and K08 (radio frequencies for South Africa):

Part No. Notes
A2208271242 From date 28/10/2003 to 20/01/2004 (replaced by A2208701889),
A2208701889 From date 28/10/2003 (replaced by A2208702989)
A2208702989 From date 28/10/2003

Wiring diagram

MOST and MQS 4-pin plug socket.
Audio output and power sockets.
Audio output and power sockets connected.
Antenna sockets.

MOST + MQS 4-pin connector

W220 AGW MOST connector.jpg MOST MQS 4-pin connector diagram.png

MOST 2-pin plug (A0025459040) and MQS 4-pin plug (A0025458440) is used inside MOST and MQS 4-pin housing (A0005458430).

MOST housing:

  • 1 (Receive) - MOST in
  • 2 (Transmit) - MOST out

MQS 4-pin housing:

  • 1 (yellow/black) - Mute (Telephone mute connector sleeve)
  • 2 (brown/red) - CAN-B H (Left voltage distributor (CAN) connector)
  • 3 (blue/black) - MOST wakeup
  • 4 (brown) - CAN-B L (Left voltage distributor (CAN) connector)

Audio output connector

Only for vehicles without sound system (option code 810). For vehicles with sound system Audio Gateway does not act as amplifier, but sends audio to Sound Amplifier over MOST network.

14-pin bushing housing (A2205453728).
Contact spring for 14-pin bushing housing (A0135451426).
  • 1 (blue) - (+) Bass module speaker speaker connector (pin 2)
  • 2 (blue/white) - (-) Bass module speaker connector (pin 1)
  • 3 (blue/yellow) - (+) Center cockpit speaker connector (pin 2) through Cockpit wiring harness and FFS [RBA] connector (pin 4)
  • 4 (brown) - (-) Center cockpit speaker connector (pin 1) through Cockpit wiring harness and FFS [RBA] connector (pin 3)
  • 5 (grey/green) - (+) Center cockpit speaker connector (pin 2)
  • 6 (grey/white) - (-) Center cockpit speaker connector (pin 1)
  • 7 (green) - (+) Left front door speaker group connector (pin 2)
  • 8 (brown/green) - (-) Left front door speaker group connector (pin 1)
  • 9 (pink) - (+) Left rear door speaker group connector (pin 2)
  • 10 (brown/pink) - (-) Left rear door speaker group connector (pin 1)
  • 11 (white) - (+) Right rear door speaker group connector (pin 2)
  • 12 (brown/white) - (-) Right rear door speaker group connector (pin 1)
  • 13 (black) - (+) Right front door speaker group connector (pin 2)
  • 14 (brown/black) - (-) Right front door speaker group connector (pin 1)

Power connector

4-pin plug housing (A2205453928).
Contact spring for 4-pin plug housing (A0135451426).

W220 A2205453928 bass-box speaker 4-pin plug housing diagram.png

  • 1 (blue) - Rear window antenna amplifier module connector (pin 2)
  • 2 - unused
  • 3 (brown) - Ground (left wheelhouse in luggage compartment)
  • 4 (red/yellow) - Fuse 24 in the left fuse box

Antennas

  • (black) - Rear window antenna amplifier module (pin B)
  • (black) - Rear window antenna amplifier module (pin C)

Firmware Update

Firmware can be updated using SDS under "Audio gateway (MOST network management diagnosis gateway radio tuner) AGW -> Control unit adaptations -> Control module programming". However, since the update process goes online to pull latest firmware version the procedure can be done only by the dealer using their Star Diagnosis machine.

The latest software version available for AGW A2208701789 (checked April 2015) is 16/2005.

Software Version in SDS

Software version can be read in SDS under "Audio gateway (MOST network management diagnosis gateway radio tuner) AGW -> Control unit version".

Before update. Software status 46/03. Software version 2204451100_004.
After update. Software status 16/05. Software version 2204420260_001.

Software Version in SDS Quick test log

SDS initial quick test log will display AGW software version.

Before update. SW Version 46/2003.
After update. SW Version 16/2005.

Software Version in COMAND-APS Hidden Menu

AGW software version can be viewed also in COMAND-APS hidden menu under "Components -> Media -> Software Versions / MOST AGW Versions".

Before update. SW Programming Date 05.16.03.
After update. SW Programming Date 03.46.05.
Before update. SW ECUIdentification 46.03.
After update. SW ECUIdentification 16.05.