Using the M.U.T.-III, check the data list of LDW. It is judged normal if the display turns ON from OFF when the light receiver of LDW-ECU (light sensor) is covered by hand, with item No.81: Tail lamp, 82: Low beam, and 83: Tunnel detection.
note
When covering the LDW-ECU (light sensor) receiver, be careful not to touch the windshield surface (where the LDW-ECU (light sensor) receiver is mounted). (The LDW-ECU (light sensor) receiver has limited resistance to oil.)
Before checking the data list by using M.U.T.-III, wipe the windshield thoroughly and visually check if there are foreign materials on the windshield to which the LDW-ECU (light sensor) is installed.