Diagnosis instructions
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The state of charge of the emergency battery can be read via the control unit functions and the procedure for telecommunications. If the emergency battery needs to be replaced, a fault memory is stored.
The diagnosis of the USB connection between Telematic Communication Box (TCB) basic version and headunit is integrated into the diagnosis of the headunit.
Function structure > 03 Body > Audio mode, Video mode, Navigation, Telephone > Headunit > Devices connected to headunit