The location of the microphones differ depending on how the vehicle is optioned….and/or if you have a convertible vs the 2 & 4 door coupes. The 2 & 4 door coupes mics are in the headliner (see B3 & B2 or B265 (for B&O system) below:
Since the convertibles don't have a solid "headliner"...their microphone is in a different location. See the illustration below...
B3 &
B2 are the
microphone locations for the convertibles for the basic & HK systems.
B265 is the combined mic location for the B&O audio system on the convertibles. The mics (on the convertible) are located in the shroud/trim around the steering wheel column. I can’t find an illustration of where B2 is located on the convertible (sorry).
If you have the B&O system…your microphone is
B265 in the illustration below:
Microphone (for Bang & Olufsen)
The microphone is e.g. always installed with optional equipment SA6F2 "Bang & Olufsen High End Surround Sound System".
The microphone is a combination microphone. That means: The following 2 microphones are installed in one housing:
1 microphone for hands-free mode when making phone calls, and for voice input to the voice processing system.
1 microphone for volume adjustment of SA6F2
The microphone records the prevailing sounds in the passenger compartment. This allows the audio playback volume to be adjusted accordingly.
The 2 microphones have separate circuits.
Functional description
Depending on the vehicle equipment, the two microphones are connected directly to the corresponding control unit via separate circuitry and plug connections.
Microphone for hands-free mode and SVS
The microphone is, for example, connected directly to the Telematic Control Unit or interface box or Combox or headunit. Using the MOST interface on the control unit, the digital signal is also provided to other bus users on the MOST network.
Microphone for volume adjustment for equipment with SA6F2
The microphone is connected directly to the premium Top HiFi amplifier or High End audio amplifier.
The microphones differ, for example, in their directivity. The directivity of a microphone is its ability to pick up sound waves from different source directions at different volumes. For example, a microphone with the corresponding level of directivity picks up sounds waves from a specific direction particularly clearly and loudly. Sound waves from the remaining surrounding area are to a large extent suppressed.
The microphone for hands-free mode and SVS has cardioid directional characteristics. The microphone picks up sound waves from a specific direction particularly effectively.
The microphone for volume adjustment for equipment with SA6F2 has omnidirectional directivity. The microphone picks up sound waves from all directions almost equally.
For clear assignment, the plug connections for the microphones are colour-coded.
1. Microphone
2. 3-Pin plug connection (colour: bordeaux purple), connection for the microphone for hands-free mode and the voice processing system
3. 3-Pin plug connection (colour: blue), connection for the microphone to volume adjustment on SA6F2