Theory Of Operation

The module uses a single dedicated 70mm speaker for vocal communication with the vehicle occupants during an eCall. The system will detect an eCall trigger, whether automatic through a crash severe enough or manual at a vehicle occupant's request by pressing the SOS button. Once triggered, the system will attempt to send an MSD to any public system operated by an MNO and also attempt to establish a voice connection between the vehicle and the PSAP. When connected to the MNO, the vehicle will transfer the vehicle location and VIN.

In the event that the vehicle battery connection is compromised, a backup battery is mounted within the module to ensure the integrity of the system and a continuation of an eCall if the vehicle battery becomes disconnected while a call is in progress. If the backup battery becomes discharged, a message will be indicated in the Instrument Panel Cluster (IPC) and a diagnostic code set in the module. The microcontroller continuously monitors all of the system electrical circuits to determine the system readiness. If the module detects a monitored system fault, it sets an active and stored Diagnostic Trouble Code (DTC) and sends electronic messages to the IPC and BCM over the CAN data bus to turn on the indicator. An active fault only remains for the duration of the fault, or in some cases for the duration of the current ignition cycle, while a stored fault causes a DTC to be stored in memory by the module.

For additional detailed description and operation of the system. Refer to MODULE, EMERGENCY ASSISTANCE (EAM), DESCRIPTION AND OPERATION .