Technically, OBD uses CAN bus and, hey, whaddya know, we've got some CAN-capable microcontroller boards here at Adafruit so this OBD Plug (16-pin) to DE-9 (DB-9) Socket Adapter Cable will come in super handy when you want to attach one of our CAN boards to your car!
On one end is a 16-pin OBD plug that goes right into your car's port. The other end is a DE-9 'CAN bus' connector. Sometimes DE-9 connectors are referred to as DB-9. Technically that's the wrong name, but it's so ingrained that most people only know the connector as DB-9.
Note: Despite having a serial port-looking end, this cable is not meant to be plugged directly into a computer’s serial port. It is meant to plug into a hardware CAN BUS interface. It does not contain circuitry or any kind of translator, it only re-wires a OBD plug into a DB-9 plug
Here's the pinouts, you'll need to match this up against the CAN board you have to make sure the CAN H, CAN L and GND in the right spots.
DB-9 pin 1 connects to OBD pin 11
DB-9 pin 2 connects to OBD pin 14 : CAN L
DB-9 pin 3 connects to OBD pin 5 : Signal Ground
DB-9 pin 4 connects to OBD pin 8
DB-9 pin 5 connects to OBD pin 1
DB-9 pin 6 connects to OBD pin 4 : Chassis Ground
DB-9 pin 7 connects to OBD pin 6 : CAN H
DB-9 pin 8 connects to OBD pin 3
DB-9 pin 9 connects to OBD pin 16 : Battery Power
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