ML 550 (164.172) V8-5.5L (273.963) (2009)
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Direct line
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GPS antenna splitter (A2/5), with code (512) COMAND APS with DVD changer, and direct line
The GPS signals are used by the emergency call control unit to calculate the current vehicle position (receiver).
In addition, the vehicle's direction of travel is determined with the aid of the sequence of the locations calculated with GPS.
Basic position finding function requirements
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Status "Circuit 15R ON"
Basic position finding function sequence
For basic position finding, the emergency call control unit requires the following information:
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Wheel speed signals
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Distance traveled data
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Direction of travel data (forwards or backwards)
The wheel speed signals are detected by the following rpm sensors:
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Left front rpm sensor (L6/1)
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Right front rpm sensor (L6/2)
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Left rear rpm sensor (L6/3)
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Right rear rpm sensor (L6/4)
The wheel speed signals from the rpm sensors are received by the emergency call system control unit over the following path:
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Direct line
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ESP control unit
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Engine compartment CAN
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Central gateway control unit (N93)
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Diagnostic CAN
The distance traveled data is received by the emergency call system control unit from the instrument cluster (A1) in the following way:
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Interior CAN
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Central gateway control unit
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Diagnostic CAN
The emergency call system control unit receives the data on the direction of travel (forwards or backwards) from the central gateway control unit over
the diagnostic CAN .
After this the emergency call system control unit uses the distance traveled, the vehicle alignment and the direction of travel to calculate the vehicle
position (degree of longitude and degree of latitude) at any given time.
Error during position finding
Basic position finding is falsified when a vehicle rolls backwards with "circuit 15 OFF" (ignition switched off) or if it is transported somewhere. In both
instances, the deviation is automatically corrected by the navigation processor integrated into the emergency call system control unit when it receives
GPS data.
GF82.95-P-3005GQU Restraint System Control Unit Data, Function
GF82.95-P-3005GQU Restraint System Control Unit Data, Function
- with CODE (359) TELE AID emergency call system
Function requirements
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Status "Circuit 15R ON"
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Proper communication with restraint systems control unit (N2/7)
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Automatic crash recognition including crash level by restraint systems control unit