How to check the brake pedal frog

Search principle

To find a fault in any vehicle on-board network system, you should use the method of sequential elimination of elements. The point is to consistently check electrical appliances and sections of the circuit, excluding elements from the list of reasons that could cause a breakdown. To do this, you need to clearly understand the design and operating principle of the system. When troubleshooting, you need to move from the components that require the least effort to check, to the most difficult to diagnose elements.

Electrical diagram

We immediately emphasize that the pinout of connectors and color markings of wires may differ not only between different models of the same automaker, but also among one model of different years of manufacture. Before you start searching for the cause of the breakdown, you need to find an electrical diagram specifically for your car model.

We will consider the principle of operation of brake lights and the troubleshooting algorithm using the example of the VAZ 2101-2102 circuit. The photo shows the general diagram of the vehicle's lighting and light signaling. We need to isolate the components involved in the operation of brake lights.

6 – mounting fuse block;
13 – brake light switch. It is a non-locking button (returns to its original position after removing the force). Located directly next to the brake pedal. When the brake pedal is released, the contacts of the limit switch are open, no current passes through it. Accordingly, when pressed, the contacts close, allowing flow through the lamps;
19 – lamps that light up when you press the brake pedal.

We do not have a diagram of the mounting block, but we know in advance that the brake lights only work when the ignition is on. There is a wire from the mounting block to the brake light limit switch, on which there is a constant + after the ignition is turned on. As soon as the limit switch contacts close, + goes to the brake light bulbs, which are connected in parallel. The “ground” of the rear lights is common and consists of a wire screwed to the car body.

Installing a laser fog brake light on a car

To install the laser brake light, you do not need any special skills, since it is attached with double-sided tape. Therefore, you can install it yourself (a mounting kit is included with the device).

The laser has two wires - red (plus) and black (minus), which need to be powered from the rear fog lamp or side lights of your car, and the beam will light up when they are turned on and remain on continuously. The laser can also be connected directly through the cigarette lighter.

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If you connect a laser emitter to the brake light power circuit, then the beam will light up only when you press the brake pedal.

Possible locations for installing a laser brake light:

Inside the car, in the area of the rear window (the beam will pass through the rear window and be reflected on the asphalt);
Above the plate with the car number (standard installation location);
Under the car's bumper or spoiler;
Under any tail light;
Behind the bumper on the bottom of the car.

When installing a laser projector on the bottom of a car or under its plastic bumper, you will have to drill two holes to mount the device. After which you will need to adjust the image projection angle.

The angle of the device affects the size of the projected image and its immediate distance from the machine itself. The recommended tilt angle of the projector should be no more than 45 degrees so that the beam is projected onto the road and not onto the car behind.

The maximum radius of the beam is up to 25 meters. And some models of laser brake lights are even capable of projecting a logo with your car brand onto the road. Looks very creative!

You can buy a laser brake light at most online stores that sell automotive products. The price for a laser brake light is about 2,000 rubles. To order this laser in the online store, you just need to fill out the order form and wait for the operator to call.

Remember that your safety comes first, and a laser fog brake light will help eliminate the desire of drivers behind you to get too close to your car.

Fault localization

Understanding the operating principle allows you to determine exactly why the brake lights may not light up:

The fuse has blown. In the diagram, the fuses are marked with the letter F (from English - Fuse) and the serial number of the seat in the fuse block, for example, F3;
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poor contact at connectors;
the light bulbs have burned out, but since the lights are connected in parallel, the likelihood that 2 lamps will burn out at once is extremely low;
poor contact on the negative terminal of the lights. In this case, problems may begin not only with the feet, but also with the lighting of the remaining lamps in the lanterns;
Damage to the negative track in the lamp board. From the total mass directly to the brake light lamp, the minus goes along a special path on the board. The path may collapse from water or mechanical impact;
malfunction of the brake light switch, the so-called frog;
broken wiring, oxidation of contacts.

Troubleshooting algorithm

To detect a fault in the electrical network, you will need a multimeter or a tester, which you can make yourself. Previously, we told you how to use a multimeter, so we won’t focus on that.

The sequence of searching for the cause of the breakdown:

Check the fuse for the brake light circuit. The location diagram of the fuse links can be found in the repair and operating manual for your car; often the symbol of the protected circuits is located on the back of the cover covering the fuse mounting block. If the installed fuse of the required rating immediately blows, there is a short circuit (short circuit) in the circuit. Please note that the fuse can protect not only the feet, but also other circuits. Installing a fuse with an increased rating is fraught with the risk of a car fire;
If oxidation is detected on the terminals, clean the contacts mechanically or use an aerosol contact cleaner.
Having turned on the ignition first and holding the brake pedal depressed, check whether there is power on the positive wire that goes from the limit switch to the rear light connector. If there is power, there is a malfunction in the lights themselves;
check whether the positive signal is coming from the mounting block to the limit switch. If + comes, but when you press the brake pedal it does not appear on the second terminal of the limit switch, then the problem is in the “frog”;
If there is no + at the limit switch terminal, examine the circuit up to the mounting block. If the wire is intact and securely fastened in the connectors, then the problem is in the mounting block.

Frog

Look at the photo of a beautiful frog. Download for free the best photos and pictures of frogs online from our website with a description.

Left-click on the picture to enlarge it and download it in higher quality.

The frog belongs to the class of amphibians and tailless animals. The frog's body smoothly transitions from the head into a body without a neck, its eyes are large and bulging, its front legs are shorter than its hind legs.

See the best photos of frogs

Frogs come in different sizes from 8 to 32 centimeters.

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Frogs are green, brown, yellow, gray.

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There are 500 species of frogs in the world today. In the Russian Federation, the most common frogs are grass and pond frogs.

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The largest frog in the world is the goliath frog, its length is 32 centimeters, and the smallest frog in the world is 2 centimeters.

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Frogs have very well developed vision; they can look forward, sideways, and up.

Frogs swim well in water and jump on land.

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Frogs live almost everywhere, except in areas with critical climatic conditions, such as the far north and sandy deserts.

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Frogs feed on flies, dragonflies, and mosquitoes.

Picture of green frog

Frogs have a sticky and forked tongue, with the help of stickiness and instantaneous throwing of the tongue, they catch food for themselves, then the tongue quickly returns back with the prey.

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Some species of frogs do not have such a tongue, so they push their prey into their mouths with their front legs.

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Reproduction occurs through external fertilization, the female lays eggs, at one time she can lay up to 20,000 eggs and exactly 10 days later tadpoles are born.

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At first they breathe through gills, but gradually their legs grow, their tail disappears, and at 4 months they become small frogs.

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At three years old, frogs become fully sexually mature.

On average, frogs live from 10 to 14 years, but many species are in the process of becoming extinct.

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In a moment of danger, the “strawberry frog”, originally from South America, is able to jump a distance of one hundred and fifty times the length of its body, which is only two centimeters.

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This means that her jump range reaches three meters. The frog achieves this result thanks to glands located under the skin that secrete a stimulating substance into the muscles.

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See further:

Ant-eater
Ant
Wombat

Interesting facts about animals in the wild
Badger

The principle of operation of the brake light

The brake lights are located at the rear of the car. Red lanterns. They light up automatically if the driver brakes. When the driver takes his foot off the brake pedal, they are also automatically turned off. The presence of stops is mandatory for vehicles.

The lights should be located symmetrically and burn brighter than the side lights. Brake lights are installed on the sides, on the rear window, in the center above the line of the side stops.

Primary and secondary brake lights can be a single bulb, a neon tube, or a set of LED bulbs. The car enthusiast is additionally equipped with a brake light repeater. The rear brake light can also serve as a fog light. You can install a formula 1 brake light (the author of the video is Mikhail Ermolaev).

The simplest brake light includes a breaker (switch) and a flashlight. The brake light switch is often called the frog switch. The plastic body of the breaker contains two terminals, a rod and a spring. This device is installed on the brake pedal.

When the driver presses the pedal, the rod enters the breaker body, the contact closes and the light comes on. As soon as the driver removes his foot from the brake pedal, the spring pushes out the rod, the contacts open and the light goes out.

LED brake lights consist of a chip and a sensor, which in this case is a frog, it sends a signal when the driver presses the brake. As with the single lamp, the frog is mounted under the brake pedal.

How to replace frog stops?

On Renault Logan, Sandero, Duster and Lada Largus cars, the brake light sensor is located under the brake pedal. You can feel it with your hands under the steering column or move the seat aside and crawl under it if it is not clear to the touch.

The first step is to disconnect the power from the sensor. This can be done without removing the negative terminal of the battery, but be careful just in case.

It is located above the brake pedal near the metal arch. Unscrew the sensor counterclockwise a quarter turn. It is also necessary to disconnect the wires suitable for the sensor.

Turn the sensor counterclockwise a quarter turn and remove it.

Having previously purchased a new sensor, we reconnect the wiring to it (it will only fit in one position, so you won’t confuse it) and insert it back in, turning it clockwise.

The photo above shows the already removed sensor, which was located below the pink mark.

Possible malfunctions: signs and causes

If the feet do not burn, the reason may be the following:

bad contacts;
damage to the wiring located in the corrugation between the door and the body;
burnt out lighting elements.

There is a situation when the brake lights are constantly on if the side lights are on. In this case, the headlights may not light up. If they are turned off, additional lighting fixtures operate normally.

In this situation it is possible:

the contacts of the parking lights and stop lights have been short-circuited;
there is no weight on the dimensions;
the two-pin lamp is faulty;
the circuit closed, but did not open.

If the parking lights and brake lights are on and the ignition is turned off, then you need to check whether the lampshades are shorted to the housing. The reason may be poor contact of the negative wire with ground.

Methods for troubleshooting

Troubleshooting is not a complicated process and even novice car enthusiasts can do it (the author of the video is Avtoelektika VC).

First of all, you should check the integrity and condition of the wiring.

Using a multimeter, you need to test the wiring. Damaged or torn sections should be replaced intact or soldered. If there are traces of oxidation processes on the contacts, they need to be cleaned.

If the LEDs burn out, they need to be replaced in pairs. If the breaker fails, it must be replaced with a new one, as it cannot be repaired. Before replacing, turn off the vehicle's power by removing the negative terminal from the battery. Then disconnect the power wires from the breaker. Next, you need to loosen the lock nut and unscrew the main nut securing the switch to the bracket.

Replacing the brake light switch

Before installation, the new frog should be checked for functionality. This can be done using an ohmmeter. We connect the device to the device and measure the resistance. When the contact is closed, the resistance should be zero. If you press the rod, the contacts should open; the resistance in this case tends to infinity.

Replacing a stop repeater with your own hands

If repairing the repeater is not practical, it should be replaced.

The replacement process consists of the following steps:

Using a wrench, unscrew the fastenings of the rear part of the stop and remove it.
Then we connect the positive wire of the lighting fixture to the terminal where the brake light frog is located. To do this, you need to run the wire into the luggage compartment, unscrew the trim on the right side, and connect it to the desired terminal. The disadvantage may be a bolt in the luggage compartment.
Heat shrink should be applied to the wiring. To prevent the wires from dangling, they need to be secured with insulating tape.
The final step is to check the device for functionality.

Photo gallery

If a repeater with incandescent lamps is installed on the car, then when connecting a device with LEDs according to the above diagram, the lamp control will not work correctly due to different loads. In this case, you should insert the positive wire into the light bulb control unit and connect it to terminal 54H.

As a brake light, a strip with LEDs can be glued to the upper part along the entire length of the rear window. It needs to be connected to a standard device, and it will work in the same way. It is important to maintain polarity. To make the tape less conspicuous, it can be painted black. Attach the tape using double-sided tape. We check for functionality.