MODEL | 117.3 up to 11/2/14, 242 up to 11/2/14, 246 up to 11/2/14 |
up to model year 2015 | |
with CODE 347 (Mercedes-Benz emergency call system) | |
without CODE 348 (Emergency call/assistant system) | |
MODEL | 156 up to 8/31/15 |
up to model year 2016 | |
with CODE 347 (Mercedes-Benz emergency call system) | |
without CODE 348 (Emergency call/assistant system) | |
MODEL | 176 up to 8/31/15 |
up to model year 2016 | |
with CODE 347 (Mercedes-Benz emergency call system) |
P82.95-2940-79
Shown on model 246, 242, 117.3 up to 02.11.2014, model 156, 176 up to 31.08.2015 |
A1 | Instrument cluster | A40/9 | Audio/COMAND control panel | S111 | Right multifunction steering wheel button group | ||
A2/22 | Telephone and stationary heater antenna (with CODE 386 (Comfort telephony), except model 117.3) | B25/12 | Hands-free system microphone | X237/1 | Mobile phone contact plate (with CODE 386 (Comfort telephony), as of 01.06.2013) | ||
A2/53 | Mobile phone and stationary heater radio remote control antenna splitter (with CODE 386 (Comfort telephony) and CODE 228 (Stationary heater)) | N2/10 | Supplemental restraint system control unit | CAN A | Telematics CAN | ||
A2/91 | Bluetooth® antenna | N10 | SAM control unit | CAN B | Interior CAN | ||
A28/11 | Multifunction antenna (model 117.3 with CODE 386 (Comfort telephony)) | N40/3 | Sound system amplifier control unit (with CODE 810 (Sound system)) | CAN E | Chassis CAN | ||
A34/1 | Telephone module with Bluetooth® (SAP profile) (with CODE 379 (Telephone module with Bluetooth® (SAP profile))) | N73 | Electronic ignition switch control unit | LIN E1 | Steering LIN | ||
A34/7 | Bluetooth® module (with CODE 386 (Comfort telephony), up to 31.05.2013) | N80 | Steering column module control unit | LVDS | Low voltage differential signal | ||
A34/15 | Mobile phone cradle (accessories, for CODE 386 (Comfort telephony)) | N123/7 | Drive Kit control unit for the iPhone® (with CODE B56 (Drive Kit Plus for iPhone® 4/4S), or CODE B62 (Drive Kit Plus for iPhone® 5s/5c/5)) | MOST | Media Oriented System Transport | ||
A40/3 | COMAND control unit | N135 | Steering wheel electronics | ||||
A40/8 | Audio/COMAND display | S110 | Left multifunction steering wheel button group |
Function requirements, emergency call system, general
Circuit 30
Transport mode not active
A mobile phone is connected to the COMAND controller unit via Bluetooth®.
Emergency call system, general
The emergency call system allows a manual or automatic emergency call to be triggered. The emergency call is received by the Mercedes-Benz Service Center. The user is spoken to in the language that is selected in the system settings of the COMAND controller unit. If necessary, the Mercedes-Benz Service Center notifies the local rescue services.
If the COMAND controller unit receives the "Circuit 15R" message from the electronic ignition lock control unit via the interior CAN, the COMAND controller unit checks the operational readiness of the emergency call system.
After a successful check, the emergency call system is operational and "SOS ready" appears in the telephone menu on the Audio/COMAND display.
The following checks are carried out:
Receipt of cyclic readiness signal ("sign of life") from the supplemental restraint system control unit
Availability of a mobile phone that is connected to the COMAND controller unit via Bluetooth®
In the event of a fault, a fault message appears on the Audio/COMAND display, depending on the fault type.
The emergency call system function comprises the following subfunctions:
Emergency call system status indication
Voice connection between vehicle and Mercedes-Benz Service Center
Data from the Supplemental Restraint System control unit
Manual or automatic emergency call
An automatically triggered emergency call has priority via a manually triggered emergency call.
Emergency call system status indication
The status of the emergency call system is indicated by a text message on the Audio/COMAND display in the following cases:
Emergency call system is operational ("SOS ready" in "Telephone" menu)
Emergency call has been activated ("activating" (call setup), "transmitting data" (data telegram transmission), "connected" (voice connection established))
Fault in emergency call system
The COMAND controller unit sends the display message over an LVDS line to the Audio/COMAND display, on vehicles with CODE B56 (Drive Kit Plus for iPhone® 4/4S) or with CODE B62 (Drive Kit Plus for iPhone® 5s/5c/5) over the Drive Kit control unit for the iPhone®.
Additional function requirements for voice connection between vehicle and Mercedes-Benz Service Center
Manual or automatic emergency call triggered.
Voice connection between vehicle and Mercedes-Benz Service Center
Once the emergency call has been triggered, a voice connection with the Mercedes-Benz Service Center is established. The COMAND controller unit mutes the audio sources and interrupts any telephone call that may be in progress. After a data telegram has been transmitted to the Mercedes-Benz Service Center, the user can speak to a service receptionist via the voice connection. The Mercedes-Benz Service Center carries out the call in the language that was selected in the system settings of the COMAND controller unit and transmitted in the telegram. The hands-free system microphone is used for the voice input. The signals from the hands-free system microphone are routed over a direct line to the COMAND controller unit.
The COMAND controller unit sends the signals of the hands-free system microphone to one of the following components via the Bluetooth® antenna:
Mobile phone (except CODE 386 (Comfort telephony) up to 31.05.2013, except CODE 379 (Telephone module with Bluetooth® (SAP profile)))
Bluetooth® module (with CODE 386 (Comfort telephony) up to 31.05.2013)
Telephone module with Bluetooth® (SAP profile) (with CODE 379 (Telephone module with Bluetooth® (SAP profile)))
On vehicles with CODE 386 (Comfort telephony) up to 31.05.2013, the Bluetooth® module sends the signals to the Mercedes-Benz service center via the following route:
Mobile phone and stationary heater radio remote control antenna splitter (with CODE 228 (Stationary heater))
Telephone and stationary heater antenna (model 246, 242, 156, 176) or multifunction antenna (model 117.3)
On vehicles with CODE 386 (Comfort telephony) as of 01.06.2013, the mobile phone sends the signals to the Mercedes-Benz service center via the following route:
Mobile phone contact plate
Mobile phone and stationary heater radio remote control antenna splitter (with CODE 228 (Stationary heater))
Telephone and stationary heater antenna (model 246, 242, 156, 176) or multifunction antenna (model 117.3)
On vehicles with CODE 379 (Telephone module with Bluetooth® (SAP profile)) the telephone module with Bluetooth® (SAP profile) sends the signals as follows to the Mercedes-Benz Service Center:
Bluetooth® module (up to 31.05.2013) or mobile phone contact plate (as of 01.06.2013)
Mobile phone and stationary heater radio remote control antenna splitter (with CODE 228 (Stationary heater))
Telephone and stationary heater antenna (model 246, 242, 156, 176) or multifunction antenna (model 117.3)
The telephone signals are received via the reverse route.
On vehicles with CODE 810 (Sound system), the COMAND controller unit forwards received signals via MOST to the sound system amplifier control unit for the voice output. On vehicles except code 810 (Sound system), the COMAND controller unit outputs the received signals over the speaker system.
In a normal case, the voice connection is terminated by the Mercedes-Benz Service Center or the user.
The setup of a voice connection to the Mercedes-Benz Service Center is aborted after several unsuccessful dialing attempts, and an appropriate message appears on the Audio/COMAND display.
In the event of failure of the telephone and stationary heater antenna (model 246, 242, 176, 156) or the multifunction antenna (model 117.3) (e.g. defective through rollover) also on vehicles with CODE 386 (Comfort telephony), the antenna of the mobile phone is used (except CODE 379 (Telephone module with Bluetooth® (SAP profile))).
Additional function requirements for data from supplemental restraint system control unit
Circuit 15R ON
Data from the Supplemental Restraint System control unit
In the event of an accident with airbag deployment, an automatic emergency call is immediately sent out. An emergency call is sent out regardless of the severity of the accident. The supplemental restraint system control unit sends the crash information, incl. crash level, to the COMAND controller unit via the following route:
Chassis CAN
Electronic ignition switch control unit
Interior CAN
The supplemental restraint system control unit transmits a readiness signal cyclically via the same route (e.g. every 500 ms). In this way the COMAND controller unit monitors the communication with the supplemental restraint system control unit and the correct operation of the crash detection.
Manual or automatic emergency call
In an emergency situation, a service receptionist from the Mercedes-Benz Service Center can obtain an overview of the status inside the vehicle with the aid of the data received from the emergency call system control unit (voice connection and data telegram) and initiate appropriate help measures. An emergency call be initiated manually or automatically. These emergency calls are made for the following reasons:
Automatic alerting of the rescue services after an accident
Alerting rescue services by pushing a button (own emergency situation, observed accident)
Reduction in rescue times through fast emergency notification with details on exact location involved
The manual or automatic emergency call function consists of the following subfunctions:
Function sequence for activating an automatic emergency call
Function sequence for activating a manual emergency call
Function sequence for transmission of emergency call data and communication with the Mercedes-Benz Service Center
Function sequence for activating an automatic emergency call
In the event of an accident with airbag deployment, an automatic emergency call is immediately sent out. An emergency call is sent out regardless of the severity of the accident. The supplemental restraint system control unit sends the crash information, incl. crash level, to the COMAND controller unit via the following route:
Chassis CAN
Electronic ignition switch control unit
Interior CAN
An automatic emergency call is also triggered (redundant) if the COMAND controller unit receives the "central locking emergency opening" signal and the cyclic readiness signal ("sign of life") from the supplemental restraint system control unit is not received.
The supplemental restraint system control unit transmits a readiness signal cyclically via the same route (e.g. every 500 ms). In this way the COMAND controller unit monitors the communication with the supplemental restraint system control unit and the correct operation of the crash detection.
The "central locking emergency opening" signal is received by the COMAND controller unit via the interior CAN from the SAM control unit.
Additional function requirements for triggering a manual emergency call
No automatic emergency call is active.
Function sequence for activating a manual emergency call
A manual emergency call can be dialed using the address book entry.
The address book of the COMAND controller unit can be opened in the Telephone menu.
On vehicles with CODE B56 (Drive Kit Plus for iPhone® 4/4S) or with CODE B62 (Drive Kit Plus for iPhone® 5s/5c/5), the "TEL" button on the COMAND controller unit (for opening the "Telephone" menu) is nonfunctional, as long as the Digital DriveStyle App is switched on.
The emergency call address book entry ("Mercedes-Benz Emergency Call") is in the first position in the address book. The reserved entry in the address book is selected using one of the operating facilities:
Phone buttons or keypad on the COMAND controller unit
Audio/COMAND control panel
Multifunction steering wheel button groups
Operation of the voice control system
The button operation on the COMAND control unit is processed internally.
The control signals from the Audio/COMAND control panel are received by the COMAND controller unit over the telematics CAN, on vehicles with CODE B56 (Drive Kit Plus for iPhone® 4/4S) or CODE B62 (Drive Kit Plus for iPhone® 5s/5c/5) as follows:
Telematics CAN
Drive Kit control unit for iPhone®
Telematics CAN
The control signals of the multifunction steering wheel button groups are transmitted to the COMAND controller unit via the following route:
Steering wheel electronics
Steering LIN
Steering column module control unit
Chassis CAN
Instrument cluster
Interior CAN
The voice commands are received by the COMAND controller unit from the hands-free system microphone.
Function sequence for transmission of emergency call data and communication with the Mercedes-Benz Service Center
Once a manual or automatic emergency call has been triggered, the COMAND controller unit sets up a voice connection with the Mercedes-Benz Service Center. Audio sources are muted, and existing telephone connections are interrupted. The status of the connection setup is indicated by the following messages on the Audio/COMAND display:
"Activating" (setting up the call)
"Transmitting data" (transmission of emergency call data (data telegram))
"Connected" (voice connection established)
As soon as a connection to the mobile phone and the mobile telephone network has been established, the COMAND controller unit automatically transmits two text messages using Message Access Profile (MAP) to the Mercedes-Benz Service Center. The text messages contain the following information:
Time stamp
Global Positioning System (GPS) position of vehicle
Language
Vehicle identification number
MB Contact status (ON or OFF)
Once the text messages have been transmitted, the voice connection is set up. The COMAND controller unit first transmits a shortened data telegram using the Dual tone multiple frequency (DTMF) procedure via the voice connection. Then the user is contacted by a service receptionist from the Mercedes-Benz Service Center. The user can terminate the emergency call by pressing the "END" button on the COMAND controller unit or the accept/terminate phone call button (S111s3) in the relevant sub-field.
During an automatic emergency call the "END" button and the accept/terminate phone call button are temporarily disabled while the connection is being set up in order to avoid unintentional termination. Pressing the "END" button or the Accept/terminate phone call button 2 times briefly in succession can interrupt the automatic emergency call.
Prioritization
The automatic emergency call has priority over a manually triggered emergency call. If an automatic emergency call is triggered during a manual emergency call, the manual emergency call is interrupted. If a manual emergency call is triggered during an automatic emergency call, it is ignored. However, a data telegram (text message or DTMF) containing updated position information is transmitted to the Mercedes-Benz Service Center, and the existing connection is maintained.
Electrical function diagram for manual or automatic emergency call function | MODEL 117.3 up to 11/2/14 up to model year 2015 with CODE 347 (Mercedes-Benz emergency call system) without CODE 348 (Emergency call/assistant system)MODEL 156 up to 8/31/15 up to model year 2016 with CODE 347 (Mercedes-Benz emergency call system) without CODE 348 (Emergency call/assistant system)MODEL 176 as of 6/1/13 up to 8/31/15 as of model year 2014 up to model year 2016 with CODE 347 (Mercedes-Benz emergency call system)MODEL 242 as of 6/1/13 up to 11/2/14, 246 as of 6/1/13 up to 11/2/14 as of model year 2014 up to model year 2015 with CODE 347 (Mercedes-Benz emergency call system) without CODE 348 (Emergency call/assistant system) | ||
MODEL 176 up to 5/31/13 up to model year 2014 with CODE 347 (Mercedes-Benz emergency call system)MODEL 242 up to 5/31/13, 246 up to 3/31/13 up to model year 2014 with CODE 347 (Mercedes-Benz emergency call system) without CODE 348 (Emergency call/assistant system) | |||
Overview of system components, telematics |