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OBD-2 ISO 14230-4 (ISO-9141-2, KWP2000) RS-232 cable schematic pinout

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OBD-2 ISO 14230-4 (ISO-9141-2, KWP2000) RS-232 cable schematic pinout

Should be suitable to vehicles of most European and Asian manufacturers. Alfa Romeo, Audi, BMW, Citroen, Fiat, Honda, Hyundai, Jaguar (X300, XK), Jeep since 2004, Kia, Land Rover, Mazda, Mercedes, Mitsubishi, Nissan, Peugeot, Renault, Saab, Skoda, Subaru, Toyota, Vauxhall, Volkswagen (VW) since 2001, Volvo to 2004

DB9M connector X1 goes to car OBDII port and supplies +12V to this circuit. Use J1962M to DB9F, Type D Cable (P/N 143301), or build an equivalent. DB25F connector X2 is RS-232 serial port to connect to PC or laptop. A DB9F could be used here instead, with appropriate pin number changes.
See also PC RS232 interface details.

 
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