Cars and bikes Diagnostic interfaces

ISO 9141-2. This protocol has an asynchronous serial data rate of 10.4 kbit/s. It is somewhat similar to RS-232; however, the signal levels are different, and communications happens on a single, bidirectional line without additional 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
  • K-line idles high, with a 510 ohm resistor to Vbatt
  • The active/dominant state is driven low with an open-collector driver.
  • Message length is Max 260Bytes. Data field MAX 255.

car OBD2 serial cable scheme



Another scheme

 

 

car obd cable

IC3, IC4 are Si 9241aey or Si9243aey, both can be used but pins are diffrent

Used for Volkswagen, Audi, Skoda, Seat. + opel bu only K-line

9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer
16 pin J1962 OBD-2 car proprietary of OBD-2 ISO-9141-2 (ISO 14230-4, KWP2000) serial cables schematics connector layout
16 pin J1962 OBD-2 car proprietary connector
at the car (looking into the car-side connector)
According to 4 reports in our database (3 positive and 1 negative) this pinout should be correct.

Is this pinout
Source(s) of this and additional information: tele-way.com, id2.cz
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