Hello, have got a funny problem, who can please help? Have the car for almost 5 years, occasionally was shown in the display that the battery of the remote control is weak, new battery in the radio key has had no effect, the error was further shown all 3-4 Wichen. About 3 months ago the key remote control did not work properly several times when operating, then no more, at the same time the error message was no longer displayed. nn the doors manually open and make, respectively start the engine and otherwise drive normally, but the FB no longer works. My question: Can it be that this C3 has a separate battery somewhere (e.g. in the FB control unit)? The error memory shows no error. Thanks for your suggestions.