![]() With the ignition on, the L Line is not needed, since the modules are already awake. ![]() As such the BMW is not dierctly compatible with RS232, either in baud or signalling levels, and could damage your PC's RS232 port if directly connected. L line is some sort of RTS/DTS line that wakes up the modules on older cars. The K line is a bi-directional serial bus with a 10.4kbaud data rate. Here's how I did it using cheap USB interfaces.īMW uses a KKL system on the 90's cars. It lets me read fault codes, live engine statistics on a per cylinder basis and reset engine adaptations after repairs.
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