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# ISO 9141-2. This protocol has an asynchronous serial data rate of 10.4 kBaud. It is somewhat similar to RS-232, but that the signal levels are different, and that communications happens on a single, bidirectional line without extra handshake signals. ISO 9141-2 is primarily used in Chrysler, European, and Asian vehicles.
* pin 7: K-line
* pin 15: L-line (optional)
* UART signaling (though not RS-232 voltage levels)
* K-line idles high
* High voltage is Vbatt
* Message length is restricted to 12 bytes, including CRC
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