REAR button in the car: purpose, functions and rules of use

What is the REAR button and where is it located?

If you got behind the wheel of a modern car for the first time, you might have noticed on the control panel or console a mysterious button with the inscription REAR. Its purpose is not always obvious, especially for beginners. This button is found in cars of different brands - from budget Hyundai Solaris up to bonus Toyota Camry or Volkswagen Tiguan. But what does she really do?

Term REAR (from English - “rear”) suggests that the function is associated with the rear of the car. However, the specific action depends on the model and configuration. In most cases the button will activate rear heating (windows, mirrors or seats), but is sometimes responsible for turning on rear view cameras, parking sensors or even electric trunk drive. It is usually located on the center console next to the seat heating buttons or on the climate control panel.

To avoid confusion, remember: if next to the inscription REAR drawn rectangle with wavy lines — This is a heated rear window. If shown eye or car with waves — we are talking about parking sensors or a camera. And if the button is next to the symbol trunk, then she opens its electric drive.

Main functions of the REAR button depending on the car model

Manufacturers use a button REAR for different purposes. Here are the most common options:

• 🔥 Heated rear window - the most common function. Turns on heating filaments on the rear window to remove condensation or ice. Found in 80% of cars, from Lada Vesta up to Kia Sportage.
• 👁️ Activating the rear view camera — turns on the camera image when reversing (sometimes it only works when pressed). Typical for Nissan Qashqai or Mazda CX-5.
• 🚗 Parktronics (parking sensors) — activates audio or visual signals when approaching an obstacle. Often combined with a camera (for example, in Skoda Octavia).
• 🧊 Heated rear seats - less common, but found in premium trim levels (for example, Audi A6 or BMW 5 Series).
• 📦 Electric trunk drive — opens/closes the fifth door or trunk (relevant for Volvo XC60 or Ford Kuga).

How to understand which function is assigned to a button in yours car? Use the instructions:

1. Look at pictogram next to the inscription REAR.
2. Look into instruction manual (section “Controls” or “Comfort”).
3. If the button only works when turned on reverse gear, most likely it is a camera or parking sensors.
4. If after pressing the buttons appear on the rear window heating strips, this is heating.

How to use the REAR button correctly: step-by-step instructions

Even if you understand the purpose of the button, it is important to use it rightso as not to damage the car or create an emergency situation. Let's look at algorithms for different functions.

1. Heated rear window

This feature is enabled in advance, and not at the moment when the glass is already covered with ice. Optimal procedure:

Start the engine and let it warm up for 1-2 minutes

Press the REAR button (the indicator should light up)

Wait 5-10 minutes - this is enough to remove condensation

Turn off the heating so as not to overheat the filaments and drain the battery

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⚠️ Attention: Do not turn on the heated rear window for a long time (more than 15 minutes). This may lead to overheating of threads and their failure. Also avoid using the function when dry glass - this reduces the system resource.

2. Rear view camera and parking sensors

If the button REAR is responsible for the camera or sensors, it is usually pressed once before the start of the maneuver. In some machines (for example, Renault Duster) the camera turns on automatically when reverse gear is engaged, but the button allows force activate her at any time.

Tips for use:

• 📸 Before the maneuver clean the camera from dirt - otherwise the image will be unclear.
• 🔊 If the parking sensors beep continuously, check cleanliness of sensors (they can work on snow or ice).
• 🚫 Don't rely only on the camera - look in the mirrors and turn your head.

3. Electric trunk drive

In electric cars the button REAR can open the trunk. What's important here is:

• 🔑 Make sure the car standing in the parking lot or neutral gear.
• 🚪 Do not be near the trunk when opening - it may move unexpectedly fast.
• 🔋 If the trunk does not close, check fuses or battery.

Common problems with the REAR button and their solutions

Like any element of the car, the button REAR may fail. Here are typical faults and how to fix them:

Problem	Possible reason	Solution
The button does not respond to pressing	Oxidation of contacts, broken wire, blown fuse	Check the fuse, clean the contacts, replace the button
Heated rear window works poorly	Damaged heating thread, low voltage in the on-board network	Check the threads with a tester, charge the battery
Rear view camera does not turn on	Oxidation of connectors, damage to the wire, failure in the control unit	Check the connections, reboot the system (remove the battery terminal)
Parking sensors are triggering falsely	Dirt on the sensors, snow, ice, sensor damage	Clean the sensors, warm up the car, replace the faulty sensor
The trunk opens jerkily or does not close	Drive wear, low voltage, mechanical blockage	Lubricate the mechanism, replace the drive, check the battery

⚠️ Attention: If after pressing the button REAR triggered wrong function (for example, instead of heating the camera turns on), this may indicate problems with the control unit. In this case, it is better to contact an auto electrician - independent repairs may worsen the situation.

What should I do if the rear window heating stops working completely?

If the heating filaments are damaged (tears or darkening are visible), they can be restored using a special repair kit (sold in car dealerships). To do this:

1. Clean the glass with alcohol.

2. Apply conductive paste to the damaged area.

3. Let dry for 24 hours.

This is a temporary solution; a full repair will require glass replacement.

Can I install the REAR button myself?

If your car does not have a heated rear window or a camera, but you want to add one, this maybe. However, the complexity of the work depends on the type of system:

• 🔧 Heated rear window - the easiest way. You need to buy glass with heating filaments (or stick a film), connect it to the on-board network via a relay and a button. Average cost of work: 3 000–8 000 ₽.
• 📹 Rear view camera — you will need to purchase a camera, a screen (or connect to a standard display) and lay wires. Price: 5 000–15 000 ₽.
• 🚨 Parktronics — you need to install sensors in the bumper, connect them to the control unit and output the signal to a speaker or screen. Cost: 6 000–20 000 ₽.

For self-installation you will need:

• Set of screwdrivers and keys.
• Circuit tester.
• Soldering iron (for connecting wires).
• Wiring diagram for your car model.

⚠️ Attention: If you are not confident in your skills, it is better to turn to professionals. Incorrect connection may result in short circuit or failure of the on-board computer.

Frequently asked questions about the REAR button: sorting out the myths

Around the button REAR There are a lot of rumors and misconceptions. Let's look at the most popular:

1. Myth: “The heated rear window can be switched on while driving.”

   Reality: This unsafe. When driving at high speed, sudden blowing of cold air onto the glass can cause it to cracking. Only turn on the heat when parked or when driving at low speeds.

2. Myth: “The REAR button is only found in expensive cars.”

   Reality: Heated rear window is found even in budget models (for example, Lada Granta or Datsun on-DO). And cameras and parking sensors are increasingly being installed in basic versions.

3. Myth: “If the REAR button does not work, you can replace it with any other button.”

   Reality: The button must match resistance and current chains. Using an inappropriate one may result in fire.

Critical Fact: In some vehicles (eg. Toyota RAV4 2019+) the REAR button is combined with the function automatic folding mirrors when setting the alarm. Pressing it at the wrong time may damage the mirror drive.

FAQ: Answers to popular questions

Is it possible to turn on the heated rear window with the engine running and idling?

Yes it is safeif the battery is charged. However, it is not recommended to keep the heating on for more than 10–15 minutes, so as not to load the generator.

Why did the rear view camera stop working after washing it?

Most likely, water got into camera connector or the contacts have oxidized. Try drying the camera with a hairdryer (not hot air!) or contact a service to clean the contacts.

What should I do if the REAR button lights up, but the heating does not work?

Check:

1. Fuse (usually 10–15 A).
2. The heating filaments on the glass (possibly burned out).
3. Heating relay (located in the fuse box).

If everything is fine, the problem may be control unit.

Is it possible to install a heated rear window on a car that did not have it?

Yes, but for this you need:

• Buy glass with heating filaments (or special film).
• Connect it to the on-board network via a relay and a button.
• Check compatibility with the generator (heating consumes 100–200 W).

On average it will cost 5 000–10 000 ₽ with installation.

Why do parking sensors work on grass or snow?

Parking sensors respond to any obstacles, including soft ones. To avoid false positives:

• Clean the sensors from snow and dirt.
• Turn off parking sensors in conditions heavy snowfall.
• Adjust the sensitivity (if there is such a function).