Location Diagram of Vehicle Diagnostic Link Connectors

Location diagram of pick-up truck diagnostic link connectors:

Location diagram of utility vehicles diagnostic link connectors:

Link diagram of small car diagnostic link connectors:

NOTE: Each vehicle manufacturer may use additional pins to diagnose a variety of systems. Not every manufacturer uses the same standard. The function on a certain pin will vary from manufacturer to manufacturer. Verify with the manufacturer.

Diagnostic Link Connectors Terminal Definition and Communication Protocols

Standard OBDII Diagnostic Link Connector 

Pin Definition (Reference material)
Various pin definitions as follows:
1. Manufacturer definition
2. SAE J1850 bus positive
3. Manufacturer definition
4. Bodywork site
5. Signal site
6. ISO 15765-4 defined CAN high
7. ISO9141 and ISO14230 defined K line
8. Manufacturer definition
9. Manufacturer definition
10. SAE J1850 bus negative
11. Manufacturer definition
12. Manufacturer definition
13. Manufacturer definition
14. ISO 15765-4 defined CAN low
15. ISO9141 and ISO14230 defined L line
16. Permanent positive voltage
[1] 1, 3, 8, 9, 11, 12 and 13 haven’t been distribution, which can be defined by manufacturer.
[2] 2, 6, 7, 10, 14 and 15 are used for diagnostic communication. They are always won’t be used at
the same time according to the actually used communication may be different. Unused definitions
can be defined by auto makers.