Explained in plain English

What's a 'low-voltage system'?

Modern cars, including Teslas, have complex electrical systems. The 'low-voltage system' typically refers to the 12V battery and related electronics that power things like lights, infotainment, and, crucially, the door mechanisms. If this system malfunctions after an accident, as mentioned in the story, it can prevent the door handles from working, trapping occupants.