PinSignalDescription4CGNDChassis ground5SGNDSignal ground6CAN HighJ-22847K-LINE(ISO 9141-2 and ISO/DIS 14230-4)9SCSSCS (Service Check System) - diagnostic codes12Programming out13 or 14?Input/Output for VTM-4 and immobilizer control14CAN LowJ-2284 (WEN)15ISO 9141-2 L-LINE(ISO 9141-2 and ISO/DIS 14230-4)16+12vBattery power (unswitched)Honda OBD-2 compatibility listNote that list is not 100% complete!
OBD II Network Diagnostics Page 5 Signal protocols: There are five basic signal protocols currently in use with the OBD-II interface. SAE J1850 PWM SAE J1850 VPM ISO 9141-2 ISO 14230 KW ISO 15765 CAN (C&B) 8 16 Fused Battery Power 7 K Line of ISO 9141 15 L Line of ISO 9141 6 ISO 15765-4 CAN Hi (Bus +) 14 ISO 15765-4 CAN Low (Bus -).
ISO 14230 KWP2000 (Keyword Protocol 2000)pin 7: K-linepin 15: L-line (optional)Physical layer identical to ISO 9141-2Data rate 1.2 to 10.4 kbit/sHigh 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 schemeDB9M 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.
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