Microphone and microphone 2

Depending on the series and the vehicle equipment, two hands-free microphones (microphone and microphone 2) are installed in the outer left and right sides of the roofliner near the sun visors. The microphone installation location can vary depending on the vehicle type. The microphones are used for the hands-free mode during telephone operation. The microphone on the driver's side is always used for an emergency call.

The microphones work with full duplex transmission. This means that the audio frequency signals are activated for both parties. It is thereby possible to speak and listen during the same call.

The hands-free microphones are directly connected to the Combox.

If a Combox is not installed, the microphone will be omitted for the roofliner on the passenger's side. The microphone for speech processing (if part of the equipment) in the roofliner on the driver's side is then directly connected with the headunit.

Fig 1: Identifying Microphone/Microphone 2

Courtesy of BMW OF NORTH AMERICA, INC.