Restraint system control unit data, function - GF82.95-P-3005LEU

MODEL 216 with CODE (359) TELE AID emergency call system as of model year 09/YoM 08 

MODEL 221 with CODE (359) TELE AID emergency call system as of model year 09/YoM 08 

Function requirements 

• Status "Circuit 15R ON"
• Proper communication with restrain systems control unit (N2/7)
• Automatic crash recognition including crash level by restraint systems control unit

General 

In the event of an accident with airbag actuation, an automatic emergency call (E-Call) is transmitted immediately. An emergency call is sent out regardless of the severity of the accident.

Function sequence 

The emergency call system control unit (N123/4) receives the crash data from the restraint systems control unit, on the one hand via a direct line as a digital crash signal and, on the other hand, it also receives the data (redundantly) including the crash level via the following route:

• Chassis CAN
• Central gateway control unit (N93)
• Diagnostic CAN

The restraint systems control unit sends a LIFE signal (the LIFE signal is the "life sign" from the restraint systems control unit) every t = 500 ms over the same path as the crash information including crash level. This allows the emergency call system control unit to permanently monitor communication with the restraint systems control unit and proper function of the crash recognition.