What does BSW mean on a car?

Blind Spot Warning (BSW) This alerts the driver to the existence of vehicles in their blind spot while they are operating a vehicle. When merging or changing lanes in a hazardous manner, certain systems trigger an additional warning to the driver if they engage the turn signal. BSW Service Required may appear as a notification on the dashboard for Mitsubishi owners. When there is a problem with the blind spot monitoring feature, this notice appears. When changing lanes, you have to look up to see whether there are any blind spots while this error warning is displayed. The Blind Spot Warning System, a security feature included in many more recent Mitsubishi automobiles, is referred to by its acronym, BSW. To monitor the blind zones adjacent to the car, a radar installed behind the back bumper is used.

BSW service required Possible Causes

A damaged radar sensor behind the rear bumper is the most common problem. Foreign objects and external conditions mud and dirt to heavy rain or snow. Damaged or misaligned radar assembly.

How to calibrate the sensor?

Fabricate two calibration plates according to the dimensions shown in the illustration. Aluminium plate: 300 mm (W), 150 mm (H) and 0.5 mm (D) or more. To fabricate the plate easily, we recommend that the plate should be 0.5 mm thick. If thinner, the plate may be curved easily. If thicker, it will take longer to fabricate the plate.

Assemble the plate pieces according to the steps below to make a triangular pyramid.
Use three of four plate pieces. If the piece is covered with a protective film, do not peel off it yet.
Place the plate pieces and apply adhesive strips together as shown. When the plate pieces are covered with a protective film, apply the strips on the non-covered surface. (Peel off only one side of film when both sides of the plate pieces are protected) To make a triangular pyramid, clearance between the plates should be 0.5 to 1.0 mm. Apply an adhesive strip on the edges to assemble the triangular pyramid as shown. Apply adhesive strips on the outside of the panel as the inside reflects the radar wave. When protective films are applied on the inside, peel off them.

Locating the BSW reflector.

Ensure that the tyre pressures are correct and the vehicle is parked on a flat level at kerbside weight. Draw a line (a) from the centre of the Three-diamond mark on the front and rear ends (line a: vehicle centre line). Draw a line (b) from the centre of the Three-diamond mark on the rear wheel (line b: rear axle centre line). The bottom of the reflector should be positioned 2,021 ± 30 mm from the vehicle centre line and 2,127 ± 30 mm from the rear axle centre line.

The top of the reflector should be 734 ± 20 mm away from the floor and the bottom should be parallel to the BSW-ECU as shown.

Connect the M.U.T.-III. Ensure that the BSW system is turned on. If no, operate the blind spot warning switch to turn on the system. Proceed to the steps below on the M.U.T.-III:
Select “BSW” or “BSW(SUB). Select “Special function.
Select “Test. Select “Radar recognition angle inspection.
Observe the flow chart below: