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      01-01-2013, 05:05 PM   #10
Kalud
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Drives: e92 335i
Join Date: Jun 2010
Location: Canada

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CAN is the communication network on the car. The JB4 read and write on that network to get various parameters (pedal position, throttle, RPM, speed, read steering button pressed) and write to it (gauge hijack, flash hazard, activate the exhaust flapper, etc).

Having it activated (read/write) interfere with any software updates the dealer could do via the obd port towards the left driver's leg. The obd port is used for diagnostic and to perform dme's software updates.