Where is the OBU Bluetooth switch located?

2 Answers
DanielLee
07/24/25 9:44am
OBU Bluetooth switch is a button on the top of the OBU device, which serves as the power switch for the device's Bluetooth. After pressing it, the Bluetooth indicator will flash and then remain steadily lit. Below are the meaning of OBU and the installation method for OBU: Meaning of OBU: OBU stands for On-Board Unit, a microwave device that communicates with RSU. In the ETC system, the OBU is placed in the vehicle, while roadside units (RSU) are installed along the road. They communicate with each other via microwave. When a vehicle passes the RSU at high speed, they communicate via microwave to verify authenticity, identify the vehicle type, calculate the toll rate, and deduct the toll fee. OBU installation method: First, open the electronic tag and peel off the adhesive backing. Attach the electronic tag firmly to the upper part of the front windshield. Then press the Bluetooth button on the top of the electronic tag and insert the card. The electronic tag screen will display that Bluetooth is turned on. Next, turn on your phone's Bluetooth, enter the mini-program, click 'Apply for Card' and 'Activate Electronic Tag,' and the Bluetooth will automatically sense and activate. Finally, upload a front photo of the vehicle, and it will be ready for use.
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Raymond
08/11/25 5:01am
I've been driving for over a decade and am quite familiar with ETC devices. For the OBU Bluetooth switch, you usually find it on the side of that small box. Try removing it from the windshield to check – there's always a small round button on the back or side, either labeled 'Bluetooth' or with a Bluetooth icon. Remember it needs power when pressing it – I usually press it twice in parked state to activate until the indicator light starts blinking. If it's a newly purchased car model, the manual definitely marks the switch location. If you really can't find it, contact ETC customer service. This Bluetooth is mainly for connecting to your phone for top-ups – never operate it while driving at high speed, safety first. By the way, last time I helped a friend find his, his device actually had proximity activation – it automatically activated when near a phone. So it really depends on your specific device model design.
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