Often owners of VAZ 2106 - 2107 wonder why the battery indicator light does not light up when the ignition is turned on . This is a fairly common problem on classic. And almost everyone has encountered such a manifestation of a malfunction in the car’s energy system.
And it’s one thing if such a malfunction occurs in the summer and 100 meters from the house. Such a breakdown is much more dangerous in cold weather on a country road, especially at night. Therefore, you need to know the causes of the problem, as well as how to fix it. There are several reasons for a light bulb to fail. You'll have to check all the options, fortunately it's not difficult. Basic electrical knowledge is sufficient.
Burnt out battery indicator light
A fairly common cause of this problem is lamp failure. This is perhaps one of the simplest breakdowns, but it is not always harmless. It is advisable to replace the light bulb as quickly as possible. If there are problems with it, you will not be able to identify the problem with the generator in a timely manner. Which will lead to the battery being discharged at the most inopportune time. Thus, driving with a burnt-out lamp is highly not recommended.
Battery charge indicator light VAZ
You should also consider the design features of your car. Most generators have a built-in resistance. This allows you to generate energy even when the charge control lamp is burnt out. On some cars, the lamp itself plays the role of resistance.
This can be found on some modifications of the VAZ 2112, as well as many old foreign cars. In this case, when the light bulb burns out, the generator stops producing current. If your car has this structure, you should always have a spare lamp.
We are looking for problems - the main culprits of the voltage drop
The problem is that your car may have a number of individual problems that lead to a drop in voltage. Therefore, only a specialist can tell the reason one hundred percent after examining the entire electrical circuit and performing high-quality diagnostics. Without inspecting the car, you can only guess the real problems and speak in general terms. However, there is a certain set of blocks and equipment that is responsible for voltage. This is what you should check first:
- battery - if this device is completely discharged, the computer tries to replenish its resources and sends the lion's share of the generated energy to charge and restore it;
- generator - a broken diode bridge can cause a significant drop in network performance, and this will cause problems with the battery in the future;
- voltage regulator (tablet) - installed on the generator and distributes voltage flows from this device; if it breaks, it can put an excessive load on the engine;
- too powerful equipment - for example, you could install a sound amplifier and subwoofer that the on-board electrical system of your car simply did not support;
- a failed consumer of electrical energy - this could be a burnt-out fan, a broken fuel pump, failed headlights, an air conditioner and other components.
Of course, this is not a complete list of possible causes of problems. It is worth remembering the importance of proper operation of the electrical network. In case of malfunctions and constantly low voltage, a variety of troubles are possible, including burning of important parts and simply low reliability of the vehicle as a whole. So it’s not worth driving with such a problem for a long time. You should immediately send the car to a service station or perform independent diagnostics.
Low battery
Another common reason why the battery warning light does not light up when the ignition is turned on in a VAZ 2106 - 2107 is a weak battery.
If, at the same time that the battery light does not light up, the dashboard instruments do not turn on or are dimly lit, then this is a clear sign of a low battery. The problem can be “cured” by simply charging the battery.
Good battery
However, not all so simple. The discharge of a car battery may not occur because the owner did not have time to charge it in time or forgot to turn off the headlights. A problem with a battery becomes dangerous if the cause lies in the generating device. As you know, the battery must be charged while the car is moving, otherwise it will discharge quite quickly. And this function falls on the generator. But if the latter is faulty, then problems arise.
Thus, a seemingly trivial reason may indicate a damaged car generator, which performs many useful functions. Obviously, a thorough diagnosis should be carried out, the cause should be found and eliminated.
Indicator light
As can be seen from the diagram, the charging system involves a large number of components and each of them can cause poor charging or its absence. To monitor the battery charging process, the car's dashboard is equipped with a control light.
If the system is in good working order, the control signal turns on after the factory. But when the engine enters operating mode, the VAZ 2107 battery charging light does not light up. This means that the battery's energy supply is replenished from the generator. At the same time, the needle on the voltmeter moves to the green sector.
Signs of a battery not charging:
- The VAZ 2107 battery charge arrow twitches.
- The control signal does not go out. In some cases, the VAZ 2107 battery light blinks.
- The voltmeter needle does not go to the green zone after starting the engine.
- When the engine is running, the voltage on the battery should remain around 13.9.
- The permissible deviation in any direction does not exceed 0.3 V. Undercharging of the VAZ 2107 battery within these limits is not yet dangerous.
A voltage drop to 12 V says: the generator is not charging! lamp is dimly lit - the battery is undercharged.
Blown fuse
A failed dashboard light may be caused by a blown fuse. In this case, several devices usually fail at once. If such a symptom appears, you just need to check the fuse. It is located in the mounting block.
Mounting fuse block VAZ 2107
You can find it using the diagram on the block cover. To check, the fuse is removed from the mounting block. The easiest way is to install a known good fuse. If this is the reason, then the light should light up when the ignition is turned on. You can also check the fuse by measuring the resistance with a multimeter.
A light bulb may burn out due to a faulty electrical circuit.
A problem with the circuit that powers the battery light can be caused by several things. Let's consider everything.
So, problems with contacts are becoming quite common. Usually this situation occurs in the spring, after cold weather. During the winter months, moisture accumulates on the connectors, causing the formation of oxides. This makes the contact much worse, as a result of which the indicator stops turning on.
Electrical circuit diagram of VAZ 2107
As a rule, this problem does not appear immediately and is not stable. In other words, the light bulb may light up one time and not another time. The solution to this problem is to clean all connectors. They should be treated with a grease specifically designed for this purpose.
The light bulb may burn out due to an open circuit. To make sure of this, you should arm yourself with a multimeter. The device checks the circuit to determine the faulty section.
Fuse relay is faulty
Another possible problem is a faulty relay. Some car modifications are equipped with a relay that monitors the battery charge light on the instrument panel. As soon as the relay fails, the indicator does not work either.
Fuse relay VAZ 2107
To test the relay, you should arm yourself with a multimeter. They measure the current at the positive output of the relay. If the voltage is less than 6V, then there is clearly a problem with the generating device. If the value is even higher, then the relay is faulty. It needs replacing.
Thus, finding out the reason why the battery light does not light is extremely important for adjusting the indicator and protecting the car from more serious malfunctions.
Checking fuses of VAZ 2106 - 2107 with a multimeter
You also need to know how to check a fuse in a car with a multimeter because in some cases replacing it does not eliminate the malfunction; the circuit needs a more thorough check. Usually its failure is visible to the naked eye, but in some cases the break can be detected only after an instrumental check. To do this, use a car tester or even a simple voltmeter to measure direct current.
- We attach the probes to the fuse.
- Next, using simple manipulations, we melt the wiring inside the fuse. Therefore, we made a non-working fuse out of a working fuse. What won’t you do for a good article!? :-). Again we apply the probes to the fuse and look at the behavior of the multimeter.
- The resistance is infinitely large, we do not hear any sound signal like “peep”. The fuse is broken. It can be thrown into the trash bin.
How to repair a generator - important recommendations
In 80% of cases, the culprit of low or unstable voltage in the vehicle’s on-board network at idle speed is the generator or its equipment. For example, the voltage regulator may be the culprit. Replacing it does not cause any particular difficulties, but it can be difficult to choose an option that is suitable in all respects. In case of this breakdown, there are several effective repair methods that will bring the desired results:
- replacing the voltage regulator - it looks like a small black tablet on domestic cars and like a small module on top or on the side of the generator on foreign cars;
- checking the integrity of the electrical circuit - perhaps there is a break somewhere in the area of the generator, voltage is not supplied to important modules for normal operation of the car;
- generator replacement - the unit is also often replaced as a whole in order to avoid problems in the future; a number of manufacturers do not recommend repairing these units at all;
- repair of the generator with replacement of the diode bridge, which is responsible for the generated electricity in the car, as well as for its correct rectification and distribution throughout the network;
- replacing a battery that is excessively discharged and requires either high-quality charging or simply replacement, it is better to buy a new battery and not experiment with old parts.
This is how difficult the process of qualitatively eliminating problems with a generator and its systems looks like. If you have no idea how the electrical module in a car works, you should not undertake DIY repairs. An incorrect connection can cost you a lot. Burnt wiring, burned blocks and system modules will have to be replaced, and this often turns out to be an unbearable burden for your budget.
Watch a video diagnosing problems with a car generator:
