If you have a car with a blind spot sensor, you may be wondering how to turn it on. The process is actually quite simple. Here's what you need to do:
1. Start the engine and put the car in drive.
2. Look for a button on your dash that says BS or BLS. This stands for Blind Spot Monitor.
3. Press and hold this button for three seconds. You should see a light on your mirror come on, indicating that the system is now active.
4. That's it! Now whenever you signal to change lanes, the blind spot sensor will be activated and will let you know if there's someone in your blind spot.