ERA Glonass Limitations
WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
The proper operation of the ERA Glonass system is dependent on several elements outside the components integrated into the vehicle. These include the National Cellular Network Infrastructure and the GPS/Glonass.
Making an SOS key press in areas that lack sufficient cellular coverage or have a temporary equipment failure will result in either the inability of a call to complete with a data transfer or the complete inability to connect to the Call Center. In this case the module will uses backup mechanism to store the MSD message into history. When the module succeeds in connecting to the network the stored MSD message will be sent to the call center.