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.
Component Function: Antenna
3. Interior Antenna 3 (Trunk Antenna)
4. Rear Bumper Antenna
The roles of the IBU (SMK + BCM + TPMS) can be divided into the passive start function for starting the engine and the passive entry function for entering the vehicle (door lock/unlock) and opening/closing the trunk. The passive start function enables a driver to supply power to and start the engine by controlling the power supply relay (ACC, IGN1, IGN2, Start) when a driver holds the smart key and presses the start/stop button inside the vehicle. The passive entry function enables the driver to enter the vehicle by possessing the smart key and pressing the door handle button to transmit door lock/unlock information to the CAN.
The IBU (SMK + BCM + TPMS) is included in the communication network (B_CAN) for the electronical system of the vehicle's body.
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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.