1.This DB9 to OBD2 cable allows you to access the pins on your car's OBDII connector.
2.It has an OBDII connector on one end and a DB9 female serial connector on the other.
3.The overall length of the cable is 1M /3.3 ft /40"
4.This adapter cable is compatible with all OBD II compliant vehicles
5.This cable is not meant to be plugged directly into a computer's serial port. It is meant to plug into some sort of hardware interface. It will not communicate with PC

How to use the cable, the pin on the OBDII connector of the car. There is an OBDII connector, and the other end has a DB9 female serial connector. The total length of the cable is 40 inches.
Note: This cable is not intended to be directly plugged into the serial port of the computer. It is designed to plug in some kind of hardware interface.
This is the basic pin assignment (OBDII> DB9 female)Pin description OBDIIDB9
2:7 J1850 bus+
4: 2 chassis ground
5:1 signal ground
6: 3 CAN high J-2284
7: 4 ISO 9141-2 K line
10: 6 J1850 bus-
14: 5 CAN low J-2284
15: 8 ISO 9141-2 L line
16:9 battery power
feature:
High-quality OBD2 to DB9 serial port adapter cable
Used to connect diagnostic interface and OBD II compatible vehicles
Length: about 40 inches
OBDII plug: 16-pin male to car
9-pin DB9 female connector to your diagnostic interface
Use model
The adapter cable is compatible with all OBD II-compliant vehicles. All vehicles (sedans and light trucks) sold in the United States from 1996 and on must comply with OBD II. Certain models of gasoline vehicles in 1994 and 1995 were compliant with OBD II.