It's probably in steady on mode.
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Generally, there will be a button next to the light ON the top of the cab, and there are three modes on the button, respectively, the mode of ON, the mode of opening the DOOR, the mode of closing the door, and the mode of closing the door. It is usually switched to DOOR mode, which lights up automatically when the door is opened and closes automatically when the door is closed. If the button is set to ON, the light will always be on and need to be turned off manually. If the interior light is abnormally on, check the light switch, the door and the lights. Because the car lights are often used, most car lights generally do not have any problems. If you don't adjust the interior lighting mode,