BMW 520 M SPORT (F11) 2013 - SOS call system failure #
Posted by Phil Cake on November 12, 2018, 3:28 pm
Year of Manufacture: 2013|
( Optional ) Engine Code or CC: N47d20c
Afternoon all. This message is displayed after starting from the Telematic communication box.
2 fault codes
B7F323:- TCB, Airbag alive signal defect(combox emergency call system)
B7F338:- TCB Airbag alive signal missing (combox
emergency call system)
I cannot find much info on this, some mentions of back battery for the message,but no mention of the
cause of the code.1 link through a forum lists a voltage or/and signal issue between the TCB and 5 different ecu's .TCB1,TPL, ATM,TCB4G & ATM02.
Has anyone had any experiences with this netowrk
or the codes so we can go a hunting on wiring ?