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.
Auxiliary Data Connector
The auxiliary data connector is a standardized 16-cavity connector. This connector shall be available on all vehicles that require service programming for controllers on the Powertrain Expansion Bus for Hybrid applications only. Diagnostics shall be available via the data link connector (DLC), and not provided via the auxiliary data connector. The pinouts for this auxiliary data connector are as follows:
- Pin 3 High voltage energy high speed GMLAN serial bus (+) terminal
- Pin 4 Scan tool power ground terminal
- Pin 5 Common signal ground terminal
- Pin 8 Ground terminal for auxiliary data connector identification
- Pin 11 High voltage energy high speed GMLAN serial bus (-) terminal
- Pin 12 Powertrain high speed GMLAN serial bus (+) terminal
- Pin 13 Powertrain high speed GMLAN serial bus (-) terminal
- Pin 16 Scan tool power, battery positive voltage 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.