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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.
3. Diagnostic Link Connectors Terminal Definition and Communication Protocols
3.1. 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
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