On-Board Diagnostics [OBD] is a vehicle bus used to monitor engine functions. OBD II is the second generation of that interface. The graphic below details a narrow OBDII to 15-pin DB Cable assembly
Narrow OBDII to DB15 Cable assembly
Male OBDII connector to 15-pin Dsub connector on a 3 inch cable.
This is one of several pages showing OBDII cable assemblies
Female OBDII to VW 2x2 pin Cable [Volkswagen]
Right Angle Male OBDII to DB-9 pin Cable
Male OBDII to DB9-pin Cable right angle
Male OBDII to Male 9-pin DB Cable
Male OBDII to Male 15-pin DB Cable
Male OBDII to Female OBDII Cable
BMW to Female OBDII Cable [Bavarian Motor Works]
Back to the main OBDII description page, or OBDII pinout, Signal Assignments