Mitsubishi owners may get a warning on the dashboard stating BSW Service Required. This message comes on when the blind spot monitoring function malfunctions. While this error message appears, you must turn your head when changing lanes to check the blind spots.

What does the BSW service required error mean?

BSW is an abbreviation for the Blind Spot Warning system, a safety feature in many newer Mitsubishi vehicles. It uses a radar mounted behind the rear bumper that monitors the blind spots next to the car.

When it detects an approaching vehicle in the blind spot, it notifies the driver with a symbol on the corresponding outside mirror. An additional feature of this system is Lane Change Assist or LCA. It alerts the driver with a buzzing sound to switch lanes while another vehicle is in the blind spot.


  • BSW service required message to show on the vehicle display
  • Inoperable BSW and LCA feature, meaning the driver will not be warned about approaching vehicles inside the blind spots.

Possible Causes

mitsubishi bsw servbice required problem

The most common problem that triggers Mitsubishi BSW Service Required warning light is a damaged radar sensor behind the rear bumper. Try pulling over and restarting the vehicle. The vehicle must be diagnosed if the BSW Service Required doesn’t reset.

Foreign objects and external conditions – that interfere with radar operation. Some possible issues include a thick layer of mud and dirt to a heavy rain downpour or snow. The system will regain proper operation after these obstructions are no longer present.

Damaged or misaligned radar assembly – due to the previous collision or after other repairs to the vehicle’s rear end, including bumper removal.

Software issues – and glitches that can result in BSW system issues in some specific situations. Installing the latest BSW software version will ensure the system has all the necessary upgrades. To diagnose Mitsubishi BSW Service Required, you need to use a Mitsubishi All System Scanner to read the fault codes stored in the BSW Control Module.

We hope you find the Mitsubishi BSW Service Required guide helpful. Check these troubleshooting and repair guides for more help on your Mitsubishi.

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