Pinouts >  Cars, Bikes and Trucks Diagnostic Link Connectors (DLC)
9 pin D-SUB male connector layout
9 pin D-SUB male 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

ISO 14230 KWP2000 (Keyword Protocol 2000)

pin 7: K-line

pin 15: L-line (optional)

Physical layer identical to ISO 9141-2

Data rate 1.2 to 10.4 kbit/s

High signal voltage level: +12V (min/max 9.60 to 13.5)

Message may contain up to 255 bytes in the data field

RS-232 to ISO-9141 cable schemeOBD 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.

25 pin D-SUB female connector layout
25 pin D-SUB female connector
According to 4 reports in our database (2 positive and 0 negative) the OBD-2 ISO 14230-4 (ISO-9141-2, KWP2000) RS-232 cable schematic pinout should be correct.

Is this pinout
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