Blind Spot Monitor
These are Blind Spot Monitor (BSM) Warning or Blind Spot Detection (BSD), Blind Spot Alert (BSA) System (left) or BLind spot Information System (BLIS) (right) or Blind Spot Intervention (BSI) symbols. Yet another instance of essentially identical systems end up with manufacturer-dependent names for reasons that are not at all clear.
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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).
Many More Versions
System problems are generally indicated by a separate alert and text message in the instrument panel. These may include the Blind Spot Alert Malfunction indicator at the left. The word OFF added to the image means that the option has been switched off or has malfunctioned. The last one is the same symbol as seen above in red. A malfunction will not effect any driving systems, so you may continue on your way. Blind Spot Monitoring will not be available, however.
This version displays only the sensors used for blind spot detection. If seen in black and white, as shown here, the system is unavailable, likely because the sensors are dirty. A text message will be seen with the symbol in the information screen. If the system is working properly, the symbol will be displayed in green.
Alternatively or in conjunction with the symbols above, text symbols with the acronym BSM, or Blind Spot Monitor, or BSM OFF, may be seen on the instrument panel. BSM alone in green simply indicates the system is on. On of the symbols above will be seen in the outside mirrors themselves.
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.
This one is used by Audi. It may be the clearest concept, in that it is the image of a car in a mirror! It is the Audi Side Assist Indicator, and, if seen, points to a fault in the system. When the light is on, the assist system is inoperative and will not detect vehicles alongside your car. Find a dealer or authorized repair station soon.
Some manufacturers use an indicator in gray scale is seen when the system is activated. It uses large triangles on either side of an image of a vehicle to show the area covered by sensors. If there is a system problem, a text message will appear. Both are seen in the center information display.
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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.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY