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Comment: Re:Surprising to me (Score 1) 159

by YabooYig (#45280953) Attached to: Car Hackers Mess With Speedometers, Odometers, Alarms and Locks
The speedometer will be configured to respond to a specific CAN message.

For example, in J1939 the vehicle speed is contained in a message formatted as follows:

Header ------------- Bytes 1-8
18FEF100 __ ll hh __ __ __ __ __

The speedo filters messages which have the header __FEF1__ and convert bytes 2 and 3 into speed, then displays it.
The hackers devices merely blasts the bus with erroneous messages.

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