The light or symbol, often seen on the far corners of outside mirrors themselves, will illuminate when a vehicle is detected in the blind spot. Also seen on mirrors are simple yellow/amber lines in many models.
The light will flash while the turn signal is operated. Manufacturers who employ the light on the instrument panel also employ an indicator lamp on the inside of the mirror to draw attention to side of the vehicle being intruded upon.
The systems monitor the areas on either side of the vehicle just behind the driver and front passenger for unseen vehicles and obstructions. The indicator lights look like vehicles pointing a beam at another vehicle, which is pretty much what it is doing.
Note that these systems are evolving to active duty. That is, if an obstructive is detected in the area covered, the vehicle will move itself out of the way (Blind Spot Intervention above).
BSM alone and in yellow/amber indicates a problem with the system. If on continuously, BSM OFF indicates the system has been turned off. If flashing, BSM OFF indicates a problem with the system. See your dealer or authorized service center for repairs. The vehicle can be driven without the benefit of the advanced system.
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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
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