SparkFun
OBD-II to DB9 Cable
The OBD-II to DB9 Cable connects your vehicle's OBD-II diagnostic port to a DB9 female serial connector, providing access to automotive bus protocols for dia...
The OBD-II to DB9 Cable connects your vehicle's OBD-II diagnostic port to a DB9 female serial connector, providing access to automotive bus protocols for diagnostics, data logging, and vehicle hacking projects.
The cable is 5 feet (approximately 1.5m) in length and breaks out all key OBD-II pins to the DB9 connector, supporting CAN, ISO 9141-2, and J1850 protocols.
Key Features
- OBD-II to DB9 Conversion – Standard pinout for automotive diagnostic interfaces
- Multi-Protocol Support – CAN High/Low, ISO 9141-2 K/L Lines, and J1850 BUS+/−
- Battery Power Pin – OBD-II pin 16 (battery power) mapped to DB9 pin 9
- 5-Foot Cable Length – Approximately 1.5 metres for comfortable reach
Pinout (OBD-II → DB9)
Pin Description OBD-II Pin DB9 Pin J1850 BUS+ 2 7 Chassis Ground 4 2 Signal Ground 5 1 CAN High (J-2284) 6 3 ISO 9141-2 K Line 7 4 J1850 BUS− 10 6 CAN Low (J-2284) 14 5 ISO 9141-2 L Line 15 8 Battery Power 16 9Ideal For
- Automotive diagnostics and data logging
- Vehicle CAN bus projects
- Connecting OBD-II hardware interfaces
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- CAN bus
- CAN bus is a reliable two-wire communication network originally designed for vehicles and now common in machinery and robotics. It matters when you need multiple controllers or devices to share status and control messages in a noisy electrical environment.
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Prototyping & Wiring
Supplier page — sparkfun.com
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Related Tutorials
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