According to, On-Board Diagnostics, or OBD, is a generic term referring to a vehicle’s self-diagnostic and reporting capability. It gives the vehicle owner or a repair technician access to state of health information for various vehicle sub-systems. The has 16 pin locations which are numbered as shown below.

Pinout Diagram

OBD Connector Pinout Schematic Diagram

Pinout Assignment

1 ____ 5 (signal ground)
2 ____ 4 (chassis ground)
3 ____ 6 (CAN high J-2284)
4 ____ 7 (ISO 9141-2 K Line)
5 ____ 14 (CAN low J-2284)
6 ____ 10 (J1850 Bus-)
7 ____ 2 (J1850 Bus+)
8 ____ 15 (ISO 9141-2 L Line)
9 ____ 16 (Battery Power)


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