Subaru FORESTER 2020 Quick Reference Index page 31

11 ENTERTAINMENT
11.2 Telematics System
Data Communication Module (DCM)
The data communication inside the cabin uses CAN for send/receive the data between each unit, and as for the external
communication, the telematics service is provided by communicating with servers via roof antenna and the sub-antenna
inside the instrument panel.
The data communication module, which is the heart of the system, is installed in the center of the vehicle, inside the
cabin, which is affected least during a crash.
It will operate with the battery built-in the DCM (BUB: Back Up Battery) even when power is not supplied from the
battery of the vehicle at the time of a collision (front collision) or during the SOS call, allowing to continue the
emergency call.
It has adopted the secondary battery, which will be charged from the vehicle battery while the ignition is ON.
The degradation of the secondary battery is monitored, and notifies the replacement time with an indicator before it will
not work as a backup power source.
(a)
(b)
ET-10630
(a) DCM (b) Backup battery (BUB)
11-17