Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Data Link Connector (DLC)
The data link connector (DLC) is a standardized 16-cavity connector. The DLC low speed serial data circuit is connected directly to the instrument panel (I/P) splice then to all other splices or modules. Connector design and terminal location is dictated by an industry wide standard, and is required to provide the following:
- Terminal 1 low speed GMLAN communications terminal
- Terminal 4 scan tool power ground terminal
- Terminal 5 common signal ground terminal
- Terminal 6 high speed GMLAN serial data bus (+) terminal
- Terminal 14 high speed GMLAN serial data bus (-) terminal
- Terminal 16 scan tool power, battery positive voltage terminal
With RPO HP2 the DLC also connects the high speed hybrid GMLAN bus to the scan tool for programming purposes. The terminal and circuits are as follows:
- Terminal 3 high speed hybrid GMLAN serial data bus (+) terminal
- Terminal 11 high speed hybrid GMLAN serial data bus (-) terminal
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.