Both low beam headlights do not light up

The driver is thrown off balance by any car breakdowns, but the failure of any elements on the night road is especially frightening. A problem often arises when, when the high beams are working, the low beams simply do not turn on. If the car is on a deserted country highway, then this situation is not critical.

On the other hand, blinding oncoming vehicles is quite dangerous. Therefore, it is important to present approximate causes of this phenomenon and try to eliminate them in time.

The fine for one low-beam headlight that does not work when driving at night can be 500 rubles, so you should not put off solving the problem for a long time.

The filament in the light bulb has burned out

The first thought that comes to mind if any light source does not turn on is that the light bulb has burned out. Car lamps are designed in such a way that the low beam filament can burn out while the high beam filament is working. That is, in halogen lamps there are two separate filaments, and the breakage of one of them has no effect on the performance of the second.

To replace a light bulb, it is not at all necessary to contact the services of an auto electrician. All you need to do is follow these steps:

open the car hood;
remove the protective cover on both sides of the headlight;
disable contact group;
remove the spring clips;
remove the burnt out light bulb;
insert new one;
Carry out all preparatory steps in reverse order.

At the same time, we should not forget to follow some rules:

It is recommended to wipe the surface of the flask with alcohol before installation, otherwise it may immediately burn due to the presence of greasy or dirty stains;
Do not touch the flask with unprotected hands, as this may lead to contamination of its surface. This is best done with cotton gloves, but you can also use a napkin or rag.

If all else fails

If none of the above helped you, then most likely there is a break in the circuit somewhere. It could appear as a result of:

mechanical impact (mice, rodents);
time (the wiring has deteriorated);
overheating of the wire and damage to its insulation.

This is a job for a professional electrician. The algorithm of actions is as follows.

We look at the voltage on the fuses. There should be 12 volts constantly.
We look at the voltage on one of the 33 contact chips. We need one with gray-black and gray wires in the corner part. These are the wires for the low beam headlights.
We look at the voltage at the headlight terminals.

If there is voltage everywhere, then the problem is an open circuit between the mounting block and the headlight.

When you turn on the car, the DRLs come on and two lights come on. When the headlights are turned on, the right DRL lamp does not light up, and also when the daytime running lights are turned on, all the lamps are on, but the right one is not.

The fuses are fine. Also, in the parking mode, the right brake light does not light up, although when the brake is pressed, it lights up. What could be the problem?

You turn on the dimensions - the light and backlight do not light up - 3 answers
Electric headlight corrector for Lada Granta – 1 answer
Removing headlights on Grant - 1 answer

Change the light bulbs. The lamps have two filaments - P21/4W and W21/5W.

So, flies separately, cutlets in the other direction! DRLs are DRLs, dimensions are dimensions. DRL - thick filament in the lamp, 21 watts, size - thin, 5 watts. In this case, the lamp burned out. And it’s not a fact that the new one is good, the lamps themselves burn out once a month, then one, then another.

Got distracted. It would be a good idea to check for DRL voltage on the cartridge. If indeed the new lamp is working. Or replace the left lamp with the right one.

Further. Daylight. I don't understand this term. No, in general it’s clear that there are fluorescent lamps in lamps, but I don’t know how to apply this to a car.

Further. Right stop. Here, as I understand it, this is a “luxury” package; I won’t offer anything other than diagnostics of the body electronics unit.

If you are sure that the fuses are all right (although there is a weak contact on them), then there remains a weak contact on the lamps or the absence of ground. Electrics is the science of contacts. The fuses are intact, the lamps are intact, only the contacts remain (they are weak or completely absent). Multimeter in hand and ring.

Even more useful tips in a convenient format

Fuse burned out

For this reason, one low beam headlight often does not light up. To eliminate it you need to do the following:

open the block that contains all the fuses of the automobile electrical circuits;
Using the diagram, the fuse that is needed is determined. As a rule, if it has burned out, it is immediately visible;
replace the faulty element with a working one.

By the way, if blown fuses become a frequent occurrence, then you should look for a breakdown in the wiring. To determine it, you need to ring all the elements of the electrical circuit, or seek help from specialists. Moreover, this must be done without fail, since the presence of a short circuit can cause a fire.

What is a hydraulic corrector and how does it work?

The hydraulic headlight corrector is installed on the Grant from the factory. This device adjusts the headlights higher or lower depending on the vehicle's load.

You need to adjust it yourself - there is no automatic setting.

The corrector control is located under the light switch handle. Position 0 corresponds to a car with one person - the driver.

Principle of operation:

the handle controls the hydraulic corrector cylinder;
the cylinder regulates the pressure in the flexible tubes that go to the pushers;
pushers are installed in the headlights - the higher the pressure in the tubes, the stronger the liquid inside the pusher presses on the rod;
the position of the rod deeper/further is responsible for adjusting the headlight higher/lower.

The operating principle of the hydraulic corrector is clearly shown below:

Visual representation of the headlight hydraulic adjustment system

What to do if the hydraulic corrector is broken

Have both or one headlight stopped responding to the hydraulic corrector? Most likely your pusher is broken.

If you want to fix the pushrod, there are two ways.

Table 1. Options for repairing the headlight range control pusher.

Option 1 is barbaric.

No further adjustment.

Link to a detailed description of the second method with comments here.

A corrector kit costs about 700 rubles - it may be easier to replace it

Having problems with the wires

The headlight does not light. To eliminate this malfunction, you will have to check all the blocks through which the relay and fuse box are connected. It is possible that there is a poor-quality connection, as well as oxidation of the contacts, which leads to an increase in the current flowing in these places and their heating. To eliminate such malfunctions, it is enough to tighten all the pad fastenings, having first thoroughly cleaned all contacts using sandpaper or a needle file.

It would also be useful to check the button with which the headlights are turned on, since its contacts are also subject to oxidation and they may also have a poor-quality connection. Practical experience suggests that it is from this button that you should start troubleshooting, and only after making sure that it is fully operational, continue searching for the reason why the low beam does not work.

Relay block Lada Granta

The relays are located in the same fuse and relay box, which is located to the left of the steering column under the cover.

K1 - heater fan relay

K2 - power window relay. If they do not work, also check fuse F2; if this does not help, then the problem may be in the control unit.

K3 - starter relay. If it does not work (does not turn) and this relay is working, check the battery charge level. It could also be a problem with the retractor or the ignition switch and its contacts.

K4 - ignition switch terminal 15 relay

K5 - turn signal and hazard warning relay. If the turn signals come on and do not turn off, this relay may be shorted. Also check fuse F3 (emergency mode).

K6 - windshield wiper relay. Check also fuse F4.

K7 - high beam relay. Also check fuses F14 and F15 and the lamps themselves.

K8 - horn relay. Also check fuse F20, signal switch contacts on the steering wheel.

K9 - low beam relay. Also check fuses F12 and F13 and the lamps themselves.

K10 - rear window heating relay. If the heating does not work, the problem may be in fuse F8.

K11 - engine control unit relay. Also check fuse F1.

K12 - electric fuel pump relay. Also check fuse F21.

Other reasons why one low beam headlight does not light up

Sometimes the abnormal operation of headlights lies in very unusual reasons. Thus, there is a known case when the owner of a Niva turned off the low beam after he dismantled the headlight cleaners, which had long ceased to function. As a result, for a long time he could not understand why the low beam on both headlights turned off. Only through experimentation did he manage to discover that for the headlights to work normally, the presence of any motor, be it left or right, is necessary. Ultimately, it was necessary to create an imitation of the presence of these elements by closing the contacts going to them.

This example illustrates that if, after checking all electrical circuits and the functioning of all elements, the malfunction cannot be eliminated, you should remember whether any changes or improvements have been made to the design of the car in the foreseeable past. After all, it cannot be ruled out that in the process of making changes, some brilliant idea of an engineer at the car plant was violated, which provoked the disappearance of the light.

In cases where all of the above measures were taken, but it was not possible to achieve normal operation of the low beam lamp, you should contact specialists at a service station. Otherwise, further searching for the reason why one low beam headlight is not on may take a lot of time without achieving the desired result.

Finding out the reasons that caused the low beam to fail and gaining experience in eliminating them will also help if the opposite problem occurs - the high beam stops lighting while the low beam is working normally. As a rule, the causes of the malfunction in this case are the same as those described above, only they are also supplemented by inadequate operation of the steering column switch. By the way, it can also be the reason why one low beam headlight does not light up. And in this case, it is best to simply replace it.

It’s paradoxical, but true: every third car owner encounters a situation where the low beam headlights are not on, but the high beam is on. Straightforward logic on the topic that if the optics are covered, then there should be no light at all does not work here.

This also happens, for example, to many VAZ owners: on Tolyatti models, for some reason, the right headlight is susceptible to the disease described, even on almost new cars; with the left, this incident happens much less often.

However, you should not blame exclusively domestic, so much-maligned, manufacturers: optics can sooner or later start to act up on any car. And here the point is no longer about the reliability of this or that brand, but rather about the deterioration or fatigue of some parts.

Algorithm of operation of the LCM (light control module)

The correct low beam algorithm for the Lada Granta is as follows.

When you move the switch to low beam headlights on the MCM (light control module), the green indicator on the instrument panel will light up and the low beam lamps will turn on. If the switch is set to the low beam position with the ignition off, the headlights will turn on.

If, when the ICU is turned on to the low beam position, the warning light on the panel lights up, but the headlights do not light, then the low beam has broken down.

Low beam headlight warning lamp

In a situation where the low beam headlights do not turn off when moving the MUS switch to another position, the following may be at fault:

The light control module itself. Quite a common occurrence among Grantmakers.
The contact relay is broken.

The whole problem with the situation is that even with the ignition off, the low beam will be on. Grant drivers have already drained batteries this way when, after driving along the highway, they turned off the low beams and went about their business (to have lunch, to the toilet).

Contact relay failure

If you have this problem, you should start troubleshooting with the contact relay.

Location of the contact relay in the mounting block

Open the fuse box (mounting block).
We take out the relay number K9.
It is advisable to take a known good relay for a test drive. Or you can lightly tap the old relay with a key or coin.
Reinsert the contact relay.
Checking the low beam operation.

If the low beam stops “sticking”, then the problem turns out to be in the contact relay.

Important advice. If the contact relay breaks down, the high beam may also stick. High beam relay in the mounting block numbered K7.

Light control module failure

Light control module on Grant

If replacing the contact relay does not bring results, then the MCM (light control module) is most likely to blame. In this case, it will need to be replaced. Grant providers recommend installing the MUS from a luxury model. The cost of this spare part is about 900 rubles.

The nature of such a breakdown is as follows. When the indicator switches to “O”, the low beam does not turn off, but if you click the switch to different modes, the low beam will go out.

Content

The easiest way, without a doubt, is to entrust everything to the reliable hands of a trusted auto electrician, but it is not too difficult to cope with some problems on your own - if you have the smallest amount of free time and a primitive acquaintance with the basics of electrical circuits.

The low beam of the headlights does not light up, but the high beam is on - this phenomenon can be due to several reasons. And most of them are quite easy to fix. Moreover, this can happen to your car at a completely inopportune moment: on the highway, for example, when you need to switch to low beam so as not to blind oncoming drivers with headlights. Let's try to deal with all the flaws one by one, and consider: what might be the most common options for repairing and troubleshooting such an important segment as low-beam lighting.

Adjustment

Once a year, the low beam on the VAZ 2110 should be adjusted. This procedure is necessary in order to increase the lighting efficiency and also to prevent dazzling oncoming drivers.

Below we will take a closer look at how to adjust the low beam headlights:

You need to find a flat area with a wall that will serve as a screen.
The car should be placed at a distance of five meters from the screen. A passenger must sit in front. You can also put a load weighing 75 kilograms in the car.
On the screen you need to draw a horizontal line at 600 mm, as well as a second line 75 mm below the first.
Then you need to draw three vertical lines - the two outer lines should correspond to the centers of the headlights, and the middle one should be located in the middle between them.
The headlight hydraulic adjustment handle should be moved to the position corresponding to the minimum load.
One of the headlights must be covered with cardboard or a sheet of plywood.

Then the light beam is adjusted according to the diagram. Adjustment is carried out with screws with plastic heads, which are located on the back side of the headlights. They rotate the optical element around the horizontal and vertical axis.
Next, you need to adjust the second headlight in the same way.

Here, in fact, is all the information on how to adjust the low beam headlights.

Lamp burned out

Naturally, if any light source does not turn on, the first thing that comes to mind is that the light bulb has burned out. The design of car lamps is such that the low beam may indeed be absent, but the high beam remains available. Halogen lamps have two filaments. It is quite possible for one of them to rupture - in this case, the light for which it is responsible will be absent.

To replace the bulb, the services of an auto electrician are not required. It is enough to open the hood with the ignition off, remove the protective box on both sides of the headlight, pull out the contact group, disconnect the spring clips, remove the burnt out bulb and install a new one.

A little subtlety:

The flask should be wiped with alcohol before installation, otherwise it will burn instantly. It is also not recommended to handle the bulb with unprotected hands: there is always some greasy and damp secretions on them, which can damage the light bulb. The best way to do this (replace the lighting) is with a dry cloth or rag.

Operating principle of the DRL controller

The operation of the DRL controller is based on the principle of Pulse Width Modulation (PWM). This principle has long been used by car manufacturers to adjust the brightness of instrument lighting, fan speed, etc.

In the early days of automobile manufacturing, sets of resistances and potentiometers were used to regulate power in a load. These elements were connected in series with the load and dissipated part of the power in proportion to their resistance. The level of development of modern electronics makes it possible to convert power in the load using PWM with virtually no losses. For example, losses in our DRL controllers when operating on 2 light bulbs with a total power of 110 Watts do not exceed 1 Watt. In other words, the device remains cool regardless of the selected brightness.

Non-standard reasons

Sometimes the abnormal operation of headlights is caused by completely unusual factors. There was an indescribable incident when the owner removed the headlight cleaners from his Niva because they had not functioned for a long time. As a result, he lost low beam on both headlights. And it took me a while to guess the reason! During the experiments, the owner found out that to obtain low beam, the presence of at least one of the motors is required, and it does not matter which one - left or right.

In the end, he simply short-circuited the connector, as if simulating the presence of a headlight cleaner. There were no further problems with light. So if you tapped all the links of the chain, but have not established the reason for the headlights, try to remember if you recently made any improvements to the design of your car. Perhaps in the process of these changes some engineering design was violated, which is the reason for the disappearance of light.

However, if such simple, although usually effective, measures do not produce the desired effect, you will still have to remember the phone number of a familiar auto electrician. Otherwise, you can spend a lot of time looking for reasons and never find them.

Having found out why the low beam of the headlights does not light up, but the high beam is on, and having learned to deal with this phenomenon, one day you may encounter the opposite problem, when there is a low beam, but no high beam. The reasons for these vagaries are, in principle, the same as in the previous case, only supplemented by a possible breakdown of the steering column switch. So if the reason for the strange behavior of the headlights has not been identified, and the low beam is still missing, it is likely that you will have to replace it.

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If all else fails

If none of the above helped you, then most likely there is a break in the circuit somewhere. It could appear as a result of:

mechanical impact (mice, rodents);
time (the wiring has deteriorated);
overheating of the wire and damage to its insulation.

This is a job for a professional electrician. The algorithm of actions is as follows.

We look at the voltage on the fuses. There should be 12 volts constantly.
We look at the voltage on one of the 33 contact chips. We need one with gray-black and gray wires in the corner part. These are the wires for the low beam headlights.
We look at the voltage at the headlight terminals.

If there is voltage everywhere, then the problem is an open circuit between the mounting block and the headlight.

Why doesn't the low beam headlight light up? Troubleshooting

Many car owners are faced with a situation where the low beams are not on. In this case, the distant one turns on normally, and its serviceability is beyond doubt. According to statistics, every third driver is familiar with such a breakdown firsthand. In this case, the first thought that appears in the head is the failure of the optics itself. In reality, the reason may be completely different.

The defect is well known to owners of VAZ cars, who sometimes encounter the problem even after purchasing a new vehicle. In this case, most often the headlight on the right side of the car does not light up. In turn, the head light source on the left suffers from a similar problem to a lesser extent.

But it would be dishonest to say that the breakdown is typical only for domestic cars. Foreign cars of various manufacturers are also susceptible to this “disease”. The difference is that each part has its own safety margin and resource.

What to do if the low beam does not light up? The car owner has two solutions - contact qualified specialists to fix the problem, or do the work yourself. When choosing the second option, you must have the necessary tools and knowledge of the car’s design, as well as the features of the electrical circuit. If the high beam lights up normally, but there are problems with the low beam, there may be several reasons:

The light bulb has failed.
Problems with wires (break, short circuit).
The fuse that powers the low beam lamp has blown.
Other reasons.

Regardless of the problem, you can easily fix it yourself. At the same time, knowing the reasons why the headlight does not light is useful for every car owner. There are situations in life when a fault occurs on the road, and the service station is several tens of kilometers away. Below we will look at how you can quickly solve the problem and which options are the most promising.

DOMOSTROYPlumbing and construction

Category: Construction
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Greetings to all readers!

It seems to me that this post will be useful to all Nivovods without exception. Probably everyone is familiar with the fact that sometimes you forget in a hurry to turn off the headlights or the low beam. This is especially pronounced in summer or in bright sunshine, when the light from headlights or sidelights is not noticeable. And leaving the light on can seriously strain the battery.

Here's what I had at first:

This option does not suit me at all! It’s much more convenient for me to turn off the ignition - both the low beam and the dimensions turn off.

But first, in order.

Let's start with our neighbor! What do we need to implement this idea? Money - 0 rubles. Time - 5-20 minutes. Electrical knowledge - 0%.

First, remove the terminal from the battery.

Then remove the steering wheel cover (unscrew the 4 bolts).

We find the contacts on the back of the ignition switch. The diagram is just to give you an idea. The color inscriptions do not correspond to reality.

In order for the low beam to go out when the ignition is turned off, but the dimensions remain, you need to move the blue and black wire coming to the “INT” contact of the ignition switch to contact “15” (blue wire).

The “INT” contact remains free. By the way, the permanent plus on the “INT” contact can be used to connect a radio, rather than powering it from the cigarette lighter.

Here's what I got:

But I didn’t stop there either. Then we turn off the dimensions.

What do we need to implement this idea? Money - 100 rubles. Materials: four-pin relay, socket for it, wire, terminals. Time - 30-60 minutes. Electrical knowledge - 0%.

First, remove the terminal from the battery.

We remove the “beard” and disconnect the block from the light switch. We find a black wire with a white stripe. He is responsible for the dimensions. We cut this wire and install the terminals.

I used these terminals:

We introduce a four-pin relay.

To ensure that the wires were held properly, I used the appropriate block.

The relay was implemented according to the following scheme:

We take the plus for the relay from the fan switch button (yellow with a blue stripe).

This is what I ended up with!

Thanks to all! Click “Like” and “Recommend” They don’t bite) Perhaps someone is looking for exactly this) It’s not difficult for you, but I’m very pleased!

On a Lada Granta car, a fairly common problem occurs when the low beam does not turn off, even after turning off the ignition. How to deal with this is described in detail in this article.

Repair and replacement of individual elements

In this case, you need a “10” key and a Phillips screwdriver. To begin, carefully remove the negative terminal from the battery and the front bumper. Only after this Lada Priora is ready for work:

release the lock;
disconnect the bundle of wires;
Unscrew the screw for the side mounting of the headlight on the Priora;
remove 4 clips;
Unscrew the housing fastening bolts.

Installation of new lighting elements is carried out in the reverse order. If problems arise with the rear lights, then their dismantling on the Priora is carried out in a similar way. In some cases, the functionality of the lighting element can be restored by replacing one of the parts. For example, if the headlight burns dimly, then the bulb needs to be replaced.

To complete this task you will need an industrial hair dryer. It works at a distance of 2-4 cm from the surface of the headlight. The duration of thermal exposure is 30 seconds. After the industrial hair dryer is turned on, it is necessary to act in a circumferential manner on the entire surface of the top cover. The result of the work done will be melted sealant. It does not cause technical malfunctions, while allowing you to carefully remove the lighting element on the Priora.

Recommendations for use

To prevent big problems from arising and fix minor problems when it's easiest to do so, you need to follow a few simple rules:

Periodic inspection	It is necessary to check the functionality of the lighting devices before each departure, in addition, at least once a month inspect the engine compartment and pay special attention to the reliable fastening of the wiring harnesses and all connections; very often problems arise due to the fact that the car’s wiring dangles and rubs against moving parts. elements
Monitoring the status of devices	If you hear extraneous sounds when you turn on the lights (relay clicks), or a button or steering column switch begins to work poorly, then it is better to immediately deal with the problem, without waiting for the moment when the unit fails.

Advice! When choosing a paw or any other element from the electrical equipment system, you must be guided not only by the seller’s advice, but also by information from the Internet, for example, on our portal there are descriptions of most manufacturers, which is very convenient.