Both low beam headlights do not light up

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.

Main reasons

Consider in detail the most basic reasons for such a breakdown.

Fuses blown

The fuses in the mounting block have burned out (F12 - right side, F13 - left side). Their rating is 7.5A.

F12 - left headlight, F13 - right headlight

The fuses in the photo are marked with an arrow. (top - left headlight, bottom - right headlight)

In this case, the voltage regulator may be faulty. As a result, a power surge occurred and both fuses were blown. It is necessary to check the voltage of the electrical circuit under load.

If the problem persists after replacing the fuses, it is better to contact an automotive electrician.

If you are on the road at the time of a breakdown, you can install a “bug” instead of fuses.

Carefully insert a piece of wire into the fuse connectors, preferably one, the left fuse. In this case, do not put the cover of the mounting block back on, as you will have to conduct a visual inspection; the wire may begin to heat up.

Important. We do not recommend using bugs or higher rated ceramic fuses. Try not to overload the electrical circuits, for example, when installing a cigarette lighter splitter, route the power cable directly to the battery through an additional fuse.

Low beam bulbs burnt out

“Right low beam” burned out

The low beam bulbs burned out, both of them at once, either a coincidence, or a short one, or the low beams were not turned on at idle. At high speeds, the current is greater, so both can burn out at once. The voltage regulator may also be faulty.

The low beam contact relay is broken

Location of the contact relay in the mounting block

The low beam may not turn on due to a broken contact relay. This breakdown is a very common reason. Due to the design of the relay and its low cost, the contact group may become stuck.

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.

Light control module failure

Light control module on Grant

This fault should be checked last. The cost of a new part is about 900 rubles, so the easiest way is to replace the module with a known good one, for example, take it from another car.

Grant providers recommend installing the MUS from a luxury model.

If your high beams also do not work, then check whether voltage is coming to the MUS.

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.

Power fuses Lada Granta

The power fuse box is located under the hood and is located between the battery, strut support and coolant reservoir. Looks like a vertically mounted box. By removing the top cover, access to the power fuses appears.

F1 (50 A) - electric power steering.

If the steering wheel turns hard, also check fuse F32.

F2 (30 A) - heater fan

F3 (60 A) - generator.

If the battery discharges quickly or the discharge lamp is on, check this fuse, as well as the operation of the generator itself and its brush.

F4 (60 A) - generator

F5 (30 A) - low beam headlights.

Also check relay K9 and fuses F12, F13.

When troubleshooting any electrical problems, use caution. Replace fuses and relays only with the engine off and the ignition off.

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.

Fuse blown

An equally common reason why headlights do not light up. The block where all the car fuses are grouped is opened, the pinout of their location is taken and the required one is looked for. A burnt jumper is in most cases visible to the naked eye. Even a schoolboy can handle sticking a whole part into place, so a trip to the service station in this case will probably also be unnecessary.

By the way, if fuses blow with unenviable regularity, it means there is a breakdown somewhere in the wiring. Either wire the entire circuit yourself, or visit a professional electrician - problems with the wires can lead to all sorts of troubles, including a fire.

Wire problems:

And in very different places. You will have to check all the connectors at the connection to the relay and the fuse box. They may be poorly screwed and fall off; may oxidize and not pass current. In the first case, it is enough to tighten the clamping nuts; in the second, clean the contacts. You should also check the power button: very often the wire that leads to it becomes oxidized or comes loose. We can say that in domestic cars, first of all, you should inquire about the button, and only then go somewhere deeper.

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.

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.

The low beam on the Lada Granta does not turn on and does not light up

Now we will try to figure out why the low beams on a Lada Granta may not turn on.

TOP 15 most useful products for Lada Granta - OUR EXPERIENCE!

1 Main reasons 1.1 Fuses burnt out
1.2 Low beam bulbs burned out
1.3 The low beam contact relay is broken
1.4 Light control module failure

2 If all else fails

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.

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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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.

The low beam headlights on the Lada Granta have stopped working and do not want to turn on

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Now we will try to figure out why the low beams on a Lada Granta may not turn on.