Bluetooth module localization?

Here is some information on the mobile phone system with diagrams and locations in the images below:

Function requirements
Status "Circuit 30 ON" or "Circuit 15R ON"
One mobile phone network is available in sufficient strength and quality
Mobile phone system operating error-free
Mobile phone and "audio unit" switched on
Enabled Subscriber Identification Module (SIM) card inserted in mobile phone
Compatible mobile phone inserted into UPCI [UHI] cell phone holder (Universal Portable CTEL Interface) (A34/15), which is connected to Bluetooth module (A34/7) (comfort telephony) or Bluetooth-capable mobile phone authorized in vehicle and at "audio unit" (basic telephony)
Correct Personal Identification Number (PIN) entered, if set on the mobile phone

Depending on the equipment installed one of the following control units will be installed, hereafter referred to as the "audio unit":
- Radio (A2), with code (523) MB Audio 20 radio or with code (510) Audio 20 with CD changer
- Radio and navigation unit (A2/56), with code (525) MB Audio 50 APS radio or with code (511) Audio 50 APS with DVD changer
- COMAND operating, display and controller unit (A40/3), with code (528) COMAND with DVD changer, with code (527) COMAND APS with single DVD drive (with navigation) or with code (512) COMAND APS with DVD changer

To be able to operate a Bluetooth-capable mobile phone authorized at "audio equipment" in the vehicle, the mobile phone must support Hands Free Profile (HFP) 1.0 or 1.5. More information is available under:
- www. Mercedes-benz-mobile. Com

General
Cellular mobile telephone subscriber A has logged into the mobile telephone network through his/her mobile service switching center, and cellular mobile telephone subscriber B has logged into the mobile telephone network through his/her mobile service switching center B and both are registered in their respective home location register.

Now both mobile phone subscribers can call each other via the following communication path:
- Mobile phone
- Base transceiver station
- Base station controller
- Mobile service switching center or mobile service switching center B

However, if cellular mobile telephone subscriber A or cellular mobile telephone subscriber B log into the mobile telephone network outside of the reception area of their mobile service switching center or mobile service switching center B, then both are entered into the visitor location register of the nearest mobile service switching center by the nearest base transceiver station and base station controller.

The nearest mobile service switching center automatically contacts the responsible home location register of the mobile service switching center for cellular mobile telephone subscriber A or the mobile service switching center B for cellular mobile telephone subscriber B and signals the present location of cellular mobile telephone subscriber A or cellular mobile telephone subscriber B.

If mobile phone subscriber A wants to call mobile phone subscriber B, he/she enters the subscriber's telephone number. On the basis of this telephone number, the present location of cellular mobile telephone subscriber B can be determined by his/ her mobile service switching center B. With the information on the location, the mobile phone system then transfers the call from mobile phone subscriber A to mobile phone subscriber B via the best communication path.

The mobile phone system also automatically searches for the most favorable communication path during a phone call in order to minimize transmission losses.
The transmission path in the mobile telephone network consists of the following:
- Mobile phone
- Base transceiver station
- Base station controlled
- Mobile service switching center or mobile service switching center B

Check out the images (below). Please let us know if you need anything else to get the problem fixed.

Good to hear, please use 2CarPros anytime we are here to help.