What are the reasons for the rear camera of the dash cam not displaying?

[StGavin]

The reasons for the rear camera of the dash cam not displaying are: 1. The camera is damaged; 2. The power supply of the rear camera is short-circuited; 3. The signal cable of the rear camera is broken. The functions of the dash cam are: 1. It can record video images and sound of the entire driving process, providing evidence for traffic accidents; 2. For car owners who enjoy self-driving tours, it can be used to record the scenery along the way. The installation method of the dash cam is: 1. Stick the dash cam near the rearview mirror; 2. Wrap the wire around the rearview mirror several times to avoid falling off; 3. Tuck the wire along the interior trim panel; 4. Insert the wire into the gap of the glove box; 5. Plug the other end of the wire into the cigarette lighter.