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.
Repair Procedures: Inspection: Notes
How to Check the AVN Head Unit When Replacing It (Variant Coding)
The AVN head unit performs basic audio, video and navigation functions.
It also receives overall information about the vehicle from other units (SWRC, FATC, BCM, PGS, AVM, Cluster, Cubis T, ECS, etc.) through CAN communication and forwards it to the driver.
Therefore, when replacing the AVN head unit, you must input into the unit the detailed installation option information on the vehicle to correctly use the device.
This learning process is called variant coding.
- The following process describes the GDS based input method only.
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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.