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9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the vehicle cable (adapter needed for connecting to vehicle connector)
25 pin D-SUB female connector layout
25 pin D-SUB female connector
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
RS-232 to ISO-9141 cableOBD II ISO 14230-4 (ISO-9141-2, KWP2000) to RS-232 interface cable schematic
 
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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PinoutsGuide.com > Cars and bikes interfaces > Pinout of OBD-2 ISO 14230-4 (ISO-9141-2, KWP2000) RS-232 cable schematic and layout of 16 pin car OBD2 special connector
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