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"With the E90 an additional module, the FRM, is connected to the PT-CAN to
receive the brake light signal from the LDM." (p22 E90 Voltage Supply and Bus System.pdf)
--- Seems FRM only receive the brake light signal from the LDM, so it should be JBE to foward the MFL packet from PT-CAN to K-CAN. From another point of view, PT-CAN was not connected to FRM in the model before 2007.03, but the MFL has already been there.
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