BLIS (Blind Spot Information) is a camera-based information system that under certain conditions can help the driver to notice vehicles moving in the same direction as the host vehicle in the so-called "blind spot".
The system is designed to work most effectively when driving in dense traffic on multi-lane highways.
The system is a supplement to, not a replacement for, a safe driving style and use of the rearview mirrors. It can never replace the driver's attention and responsibility. The responsibility for changing lanes safely always rests with the driver.
The lamp illuminates on the side of the car where the system has detected the vehicle. If the car is overtaken on both sides at the same time then both lamps illuminate.
In order to work most effectively the BLIS camera lenses2 must be clean. The lenses can be cleaned with a soft cloth or damp sponge. Clean the lenses carefully so that they are not scratched.
The lenses are electrically heated to melt ice or snow. If necessary, brush snow away from the lenses.