This bulletin applies to 2014-2016 Mazda3/Mazda6, 2016-2017 CX-3/CX-9 and 2014-2016 CX-5 vehicles.
In certain conditions, Smart City Brake Support (SCBS) may operate unintentionally. (objects on the road at the entrance of a curve, vehicles passing in the opposite lane when making a curve, metal objects, bumps or protruding objects on the road, when passing through a toll gate, when passing under a vinyl curtain or flag, plastic objects such as pylons, two-wheeled vehicles, pedestrians, animals or standing trees).
There may be frost/water drops on the outer surface of the windshield around the black printing portion at the upper center where the infrared laser beam is emitted. The laser sensor light beam may be refracted by water drops or foreign material on the windshield. In this case, the laser sensor may not detect an obstruction ahead correctly.
The near-infrared laser beam (Sending) emitted from the laser sensor (Sender) is refracted by water drops on the windshield and reflects an object outside of the normal sending range.
The reflected beam (Receiving) by the object (traffic sign for example) is also refracted by water drops and received by the laser sensor. The system may detect an object outside the normal detection range as a vehicle and the SCBS operates unintentionally.
In case the frost and/or water drops is/are on the outer surface of the windshield, operate the wiper system to remove the frost/water drops. Advise the customer to properly clean the windshield. Oil films may cause raindrops to stick on the windshield.
If the customer is unable to perform these preventative measures, advise the customer to turn off the SCBS operation temporarily. When the engine is restarted, the systems will become operational again.
