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.
UART Data line
UART-Based communication systems have a master of the serial data line and remote transceivers. The master controls the message traffic on the serial data line by polling all of the remotes (control modules). The master then waits for the proper response.
- The UART serial data line: The UART serial data line allows the following components to communicate data with a scan tool:
- The electronic brake control module (EBCM)
- The transaxle control module (TCM)
- The inflatable restraint sensing and diagnostic module (SDM)
- The immobilizer control module
- The anti-theft module
- The UART serial data line allows a scan tool to communicate with these modules for diagnosis and testing.
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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.