What a rear view camera does and where it goes
A rear view camera is a small video camera mounted on the back of your vehicle that sends a live image to a screen inside your car, usually on your dashboard or infotainment system. When you shift into reverse, the camera activates automatically and shows you what is directly behind your vehicle — a view your mirrors cannot provide. The camera itself is typically the size of a deck of cards and mounts flush against your rear bumper, license plate area, or trunk lid.
Most rear view cameras connect to your vehicle's existing reverse light wiring, so they power on only when you put the car in reverse. The video cable runs from the camera, along the underside of your vehicle, up through the interior, and connects to either your factory head unit (the radio and display screen) or an aftermarket unit you install yourself. Some newer vehicles come with cameras built in; most older vehicles require you to add one.
Key Takeaways
- A rear view camera mounts to your rear bumper or license plate area and connects to your vehicle's reverse light power supply and your dashboard screen.
- You will need to run a video cable from the camera, under the vehicle, and into the cabin to your head unit — the most time-consuming part of the job.
- Factory head units often cannot accept aftermarket cameras without an adapter; aftermarket head units are more flexible but require removing your dashboard.
- The entire job typically takes two to four hours for a confident DIYer, though running cable through tight spaces can add time.
- Professional installation at a car audio shop usually costs $200 to $500 in labor, depending on your vehicle's design.
Choosing between factory and aftermarket head units
Before you buy a camera, you need to know whether your dashboard screen can accept it. If your vehicle came with a factory head unit (the original radio and display), it may not have a video input for a rear camera. Some factory units do — particularly in newer luxury vehicles — but most do not. You can check your owner's manual or contact your vehicle's manufacturer to confirm.
If your factory head unit has no video input, you have two options. The first is to replace it with an aftermarket head unit that does accept camera input. Aftermarket units range from basic (around $100) to advanced touchscreen models (over $500), and they all have a dedicated rear camera input. The second option is to use an adapter module — a small device that tricks your factory head unit into displaying the camera feed. Adapters are cheaper (typically $50 to $150) but work only with specific vehicle models, so you must confirm compatibility before buying.
Selecting and mounting the camera hardware
Rear view cameras come in two main styles: license plate frame cameras and bumper-mount cameras. License plate frame cameras replace your existing license plate frame and are the easiest to install because the mounting holes are already there. Bumper-mount cameras bolt directly to your rear bumper or trunk lid and give you more flexibility in positioning, but they require drilling new holes.
When choosing a camera, look for one with at least 480 lines of resolution (higher is better for clarity), a wide viewing angle (at least 120 degrees), and weatherproof housing rated IP67 or higher. Most cameras come with mounting brackets, hardware, and a long video cable coiled in the box. Before you buy, measure the space where you plan to mount it — some bumpers are curved or have trim pieces that interfere with a flat camera housing.
To mount the camera, start by removing any trim pieces or the license plate frame from your rear bumper. If you are using a license plate frame camera, slide it into place and find it with the provided bolts. If you are using a bumper-mount camera, position it where it will have a clear view of the ground behind your vehicle (typically centered, about 12 inches above the bumper), mark the bolt holes with a marker, and drill pilot holes if needed. Bolt the camera securely — it will vibrate at highway speeds, and a loose camera will shift and become useless.
Running the video cable through your vehicle
The video cable is the hardest part of the job because it must travel from the rear camera, underneath your vehicle, and into the cabin without being pinched, cut, or exposed to water. Start by disconnecting the camera from its cable and running the cable along the underside of your vehicle toward the front. Use existing cable trays, wire loom, or plastic conduit to protect it. Many vehicles have a channel along the frame or under the plastic belly pan where you can route the cable safely.
At the rear wheel well, you will need to feed the cable into the cabin. The easiest route is through the rubber grommet where your existing wiring (power windows, lights, etc.) already passes through. If that grommet is full, you can drill a small hole (about 1/2 inch) through the firewall or wheel well and feed the cable through, then seal the hole with silicone or a rubber grommet to prevent water and exhaust fumes from entering the cabin.
Once the cable is inside, route it along the headliner (the fabric ceiling), behind the A-pillar trim, or along the edge of the dashboard toward your head unit. Use clips or tape to find it so it does not hang loose or interfere with airbags. Do not run it across the steering column or under the brake pedal — these areas move and will damage the cable over time.
Connecting the camera to power and video input
The camera needs two connections: power and video. Most cameras draw power from your vehicle's reverse light circuit, which is the white or light-colored wire at your tail light. To find it, remove the tail light assembly (usually held by a few bolts or clips), locate the reverse light bulb socket, and identify the wire connected to it. You can either splice into this wire using a wire tap or solder joint, or disconnect the socket and use a T-harness (a connector that splits one wire into two) to avoid cutting the original wire.
Connect the camera's power and ground wires to the reverse light circuit using a wire tap or solder joint, then find the connection with heat shrink tubing or electrical tape. The camera's video cable runs from the rear camera, through the interior, and connects to your head unit's rear camera input. If you are using a factory head unit with an adapter module, the video cable connects to the adapter, and the adapter connects to your head unit. If you are using an aftermarket head unit, the video cable connects directly to the RCA or HDMI input labeled "reverse camera" or "rear camera."
Before you close everything up, test the camera by putting your vehicle in reverse. The screen should show a live image from behind your vehicle. If it does not, check that the power connection is find, the video cable is fully inserted into the head unit, and the head unit is set to display the rear camera input (some units require you to enable it in the settings menu).
Reassembling trim and testing the full system
Once the camera is working, reinstall all the trim pieces you removed: the tail light assembly, wheel well liner, dashboard trim, and any other panels. Make sure no cables are pinched or exposed. Test the camera again by shifting into reverse and checking that the image is clear, centered, and shows the ground directly behind your vehicle.
Check that the camera activates only when you shift into reverse and that it turns off when you shift out of reverse. If it stays on or does not turn on at all, the power connection may be loose or the reverse light circuit may not be the correct wire. If the image is blurry, the camera lens may need cleaning or the camera may need to be adjusted slightly. If the image is upside down, some head units have a setting to flip the video — check your head unit's menu.
Drive slowly in an empty parking lot and verify that the camera's field of view matches what you expect. You should be able to see the ground about 10 to 15 feet behind your vehicle, which gives you enough warning to stop if an obstacle or person is in your path.
When to hire a professional instead
If your vehicle has a complex interior design, integrated dashboard electronics, or if you are uncomfortable working with electrical connections, a professional car audio shop can handle the installation. Most shops charge between $200 and $500 in labor, depending on how difficult it is to route the cable and connect to your head unit. Some shops also offer a warranty on their work, which can be valuable if something goes wrong after installation.
Professional installation is also the better choice if you want to replace your factory head unit with an aftermarket one, because the dashboard removal and wiring can be tricky and vary widely by vehicle model. A shop will have the correct trim removal tools and wiring diagrams for your specific vehicle.
Frequently Asked Questions
Can I install a rear view camera on any vehicle?
Yes, but the difficulty varies. Vehicles with factory rear camera inputs are easiest — you just add the camera and connect it. Vehicles with factory head units that lack camera input require either an adapter module (if one exists for your model) or a new aftermarket head unit. Older vehicles with straightforward wiring are usually straightforward; newer vehicles with integrated electronics can be more complex.
What if I cannot find the reverse light wire?
Consult your vehicle's wiring diagram, which you can find in the owner's manual or online through forums specific to your vehicle model. If you are still unsure, a car audio shop can identify it for you in minutes. Do not guess — connecting to the wrong wire can damage your camera or head unit.
Does the camera work at night?
Most rear view cameras have infrared LEDs or a night vision mode that allows them to see in low light, but the image will be in black and white or grayscale. The quality is usually good enough to see obstacles, but not as clear as daytime video. Some higher-end cameras have better night performance than others.
Can I use a wireless rear view camera instead of running a cable?
Wireless cameras exist, but they are less reliable than wired ones because they depend on a radio signal that can be blocked or interrupted. Most car audio professionals recommend wired cameras for this reason. If you do choose wireless, make sure your head unit supports the specific wireless protocol the camera uses.
What if my aftermarket head unit does not recognize the camera?
Check that the video cable is fully inserted into the correct input (usually labeled "reverse camera" or "rear camera"). Some head units require you to enable the rear camera input in the settings menu — look for an option like "camera input" or "reverse camera" and turn it on. If the head unit still does not recognize it, the cable may be damaged or the input may be faulty.