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 Communications Description and Operation
The scan tool accesses the following data lines:
- The brake pressure control valve (BPMV), on vehicles with anti-lock brake systems
- The powertrain control module (PCM)
- The Inflatable Restraint Sensing and Diagnostic Control Module (SDM)
The BLU/RED wire at cavity 7 of the data link connector (DLC) OBD 2 provides access to the BPMV, SDM, and to the PCM. The RED/BLK wire at cavity 16 provides voltage to the scan tool. The WHT/BLK wire at cavity 4 and the BRN/RED wire at cavity 5 provides ground to the scan tool.
The data lines monitor the module for diagnostic purposes and for diagnostic trouble codes (DTCs).
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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.