Voice connection between vehicle and service center, function - GF82.95-P-2022GQU

MODEL 164.1 with CODE (359) TELE AID emergency call system as of model year 2009/Modification Year 2008 model refinement package 

MODEL 164.8 with CODE (359) TELE AID emergency call system as of model year 2009/Modification Year 2008 

MODEL 251.0 with CODE (359) TELE AID emergency call system as of model year 2009/Modification Year 2008 

MODEL 251.1 with CODE (359) TELE AID emergency call system as of model year 2009/Modification Year 2008 

Function requirements 

• Circuit 30 or Circuit 15R
• Emergency call system authorized and operating properly
• Each vehicle-related service is authorized separately
• An emergency call system control unit (N123/4) communication module authorized for the corresponding vehicle-related service is configured ex-factory with the telephone number of the corresponding service provider
• The customer is registered and authorized at the service center
• One mobile phone network is available in sufficient strength and quality
• One of the following vehicle-related services is present:
  • Manual or automatic emergency call (E-Call)
  • MB-Info call
  • Breakdown assistance (Roadside Assistance)
  • Vehicle tracking

General 

Regardless of the type of vehicle-related service initiated (e.g. MB-Info call), a voice connection is established to the service center. After feedback by the service center with a special tone, an SMS is sent to the service center with the appropriate data (vehicle identification number (VIN) and vehicle model, etc.). Then the customer can speak to a service receptionist over the existing voice connection.

Function sequence 

The hands-free system microphone group (A67b1), which is integrated into the inside rearview mirror unit (A67), is used for the voice input. The signals from the hands-free system microphone group are routed over 2 discrete lines to the COMAND operating, display and controller unit (A40/3).

In the COMAND operating, display and controller unit, the signals from the hands-free system microphone group simply pass through and are forwarded to the communication module integrated into the emergency call system control unit.

The communication module integrated into the emergency call system control unit then transmits the hands-free system microphone group signals to the service center. The communication module integrated into the emergency call system control unit transmits and receives the mobile phone signals or data in the following way:

• Direct line
• TELE AID antenna (A2/93a4)

Voice output is performed exclusively over the cockpit center speaker (Centerfill) (H4/27). This speaker is controlled by the emergency call system control unit over discrete lines.

In vehicles with code (810) Sound system, the center cockpit speaker (centerfill) is therefore muted for all other applications (e.g. audio mode) via a mute signal from the emergency call system control unit via a direct line to the sound system amplifier (N40/3).

The mute signal on the sound system amplifier is used to simultaneously mute the following speakers in vehicles with code (810) Sound system:

• Left rear door speaker (H4/3)
• Right rear door speaker (H4/4)
• Left front door speaker (H4/5)
• Right front door speaker (H4/6)
• 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 (H4/54)
• Right rear surround speaker (H4/57)

The mute signal for the subwoofer speaker (H4/29) is routed by the sound system amplifier via direct lines to the subwoofer amplifier (N40/9) and from there via direct lines to the subwoofer speaker.

On vehicles, except code (810) Sound system, the emergency call system control unit sends a mute signal via a discrete line to the COMAND operating, display and controller unit to mute the following speakers:

• Left rear door speaker
• Right rear door speaker
• Left front door speaker
• Right front door speaker
• Left front door tweeter
• Right front door tweeter
• Left rear door tweeter
• Right rear door tweeter

Normally, the voice connection is deactivated by the service center or by the customer.

The hands-free system microphone group comprises 2 microphones. However, only one microphone is used for voice input.

The establishment of a voice connection to the service center is interrupted by the communication module integrated into the emergency call system control unit after several unsuccessful dialing attempts.

In the event of a malfunction of the TELE AID antenna (e.g. defective due to rollover), the communication module integrated into the emergency call system control unit automatically sends and receives the mobile phone signals and data via the TELE AID backup antenna (A2/50).

	Electrical function diagram for voice connection between vehicle and service center, function	Model 164	PE82.95-P-2069-97MAA
		Model 251	PE82.95-P-2069-97RAA
	COMAND operating, display and controller unit, component description	A40/3 With code (528) COMAND including DVD changer without navigation With code (512) COMAND APS with DVD changer	GF82.85-P-3134GQ
	Sound system amplifier, component description	N40/3 with CODE (810) Sound system	GF82.62-P-6003GQS
	Emergency call system control unit, component description	N123/4	GF82.95-P-3212GQU