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In this video I am dealing with the error message on the dashboard - Emergency Call System Not Available. Car can still be driven, but you are unable to see miles driven and fuel consumption. This is caused by battery failure from the Telematics unit located in the back of the vehicle, under the roof. It's quite common issue across all BMW range and also same type of battery is shared across multiple BMW models.
The most common source of this problem is is that the battery us simply discharged if the vehicle has not been used for a while. Try to charge the main battery with the car battery charger or run the car for couple hours to give the battery chance to recharge. If that doesn't help, then simply this small battery doesn't hold enough charge to satisfy the Telematic Unit Requirements and needs to be replaced.
Remove C + B pillar covers. Remove side cover from the back of the vehicle and detach clips at the back of the panorama window. This will give you enough space to reach out to the unit, open battery compartment and replace the battery.