Definition of 4 Wires in Reversing Camera

The 4 wires in a reversing camera are:

1. Red wire for positive power supply.
2. Yellow wire for positive video signal.
3. Black wire for negative power supply.
4. Green wire for negative video signal. Boot wiring: Typically, a single wire (usually red) is connected to the positive terminal of the rear tail light. The other 3 wires can be left unattended.

Notes on vehicle cameras:

It is essential to ensure the operating temperature of the vehicle camera remains between 0-50°C, and it must not be installed in areas with excessively high temperatures. Vehicle cameras can monitor the working status of drivers and crew members, provide reversing images, and serve as valuable evidence in traffic accidents, functioning similarly to a car's black box.

The vehicle display and camera must be correctly connected. If the display does not have an AV input interface, it is necessary to locate the corresponding video cable or install an additional video conversion device to ensure proper display of the rearview image.

Under no circumstances should the power supply of vehicle-mounted electrical devices be directly connected to the vehicle battery, as this may cause power instability and result in damage to the vehicle camera and other equipment.

A reversing camera typically uses four wires to function correctly: power (usually red), ground (black), video signal (yellow), and reverse trigger (white or another colour). The power wire provides 12V from the car’s electrical system, while the ground ensures a complete circuit. The video signal transmits the camera feed to the display, and the reverse trigger wire activates the camera when the car is put into reverse gear.

For installation:

1. Connect the red wire to a 12V power source (often the reverse light circuit).
2. Attach the black wire to a clean metal ground point.
3. Link the yellow wire to the video input on the display unit.
4. Join the reverse trigger wire to the positive side of the reverse light circuit to ensure the camera activates automatically.

Proper wiring is crucial for reliability. If the camera doesn’t turn on, check the power and ground connections. A fuzzy or no signal often points to a faulty video cable or poor connection. Some modern systems integrate with infotainment displays, requiring additional configuration. Always refer to the manufacturer’s guide for model-specific details.

From an electrical perspective, the four wires in a reversing camera serve distinct roles. The red wire delivers power, the black wire grounds the system, the yellow wire carries the video signal, and the reverse trigger wire (often white) ensures the camera only activates when reversing. Incorrect wiring can lead to malfunctions, so double-check connections against the vehicle’s wiring diagram.