S82.85-4572-09
N112/9 | HERMES control unit |
Location
The HERMES control unit is located under the instrument panel in the area of the steering column.
Tasks
The HERMES control unit is responsible for the following tasks:
Prioritization of the services in the internal arithmetic unit
Self-diagnosis, secures operational readiness of emergency call system by checking the following facts:
Reception of cyclic readiness signal from Supplemental Restraint System (SRS) control unit (N2/18)
Connection for muting audio sources (mute function)
Connection to hands-free system microphone (B25/17) over radio (Audio/COMAND) (N87/6)
Connection to GPS antenna (A2/47), HERMES GSM antenna (A2/163)
Setting up of voice connections or data links to the service provider over the GPS antenna or HERMES GSM antenna
Reception of hands-free system microphone signals
Sending of audio signals to HERMES speaker (H24)
Reception of GPS signals (global navigation system) for position finding over the GPS antenna
Forwarding of real-time traffic data from service provider to radio (Audio/COMAND) over direct line
CAN communication over the diagnostic CAN (CAN D) with electronic ignition lock (EZS) control unit (N73)
The HERMES control unit can, e.g. receive the following CAN signals:
Status of circuit 15 from the electronic ignition lock (EZS) control unit as a trigger signal for self-diagnosis of the emergency call system
Cyclic readiness signal from the supplemental restraint system (SRS) control unit as check signal
Crash signal from supplemental restraint system (SRS) control unit as trigger signal for the automatic emergency call
Control signal for SOS button (N70s11), breakdown assistance button (N70s12) and MB-Info button (N70s13) from the overhead control panel (OCP [DBE]) control unit (N70)
"Central locking emergency opening" signal from the signal acquisition and actuation module (SAM) control unit (N10/1) as a redundant trigger signal for the automatic emergency call
Control signals of left multifunction steering wheel button group (S110) and right multifunction steering wheel button group (S111)
Signals of steering wheel angle sensor from steering column tube module (MRM) control unit (N80) for position finding
Wheel speed and yaw rate signals from Electronic Stability Program (ESP) control unit (N30/4) for position finding
Position data from radio (Audio/COMAND) for position finding
The HERMES control unit can transmit the following CAN signals, for example:
Status display through actuation of anti-theft alarm system-readiness indicator (N70e4) in the overhead control panel (OCP [DBE]) control unit
Map data and other data sent by the Service Center over the electronic ignition lock (EZS) control unit to the Audio/COMAND display control unit (A40/8)
Status signals to instrument cluster (IC [KI]) control unit (A1/1) over the electronic ignition lock (EZS) control unit
Display messages for showing on the Audio/COMAND display over the electronic ignition lock (EZS) control unit and the radio (Audio/COMAND)
"HERMES" stands for: "Hardware for Enhanced Remote, Mobility & Emergency Services".
Body
Integrated Internet-compatible communications module with Bluetooth® interface and with radio interface for wireless local area network (WLAN)
Integrated locating module
Integrated GPS receiver for position finding (date, time, history and last known location)
Memory for navigation and vehicle-specific data