If the wipers on a VAZ-2107 car do not work, you can easily fix them yourself without involving car service mechanics. But for this, it is very desirable to have at least an initial understanding of the design of the windshield wiper used in this model.
SL-193 windshield wipers are installed on all “sevens”, both with carburetor and injection engines. Their design uses an electric motor with a gearbox, as well as a lever mechanism and a switch for supplying glass washer fluid. The electric motor is started using a special button located on the steering column. It also allows you to regulate the intensity of the liquid stream.
In addition to the water tank (or “glass washer”), the washer contains a compact pump and nozzles that spray liquid. In addition, it should be noted that there is a fuse that prevents increased loads on the motor and pump and protects them from voltage surges.
Operating principle
On a VAZ 2107 car, the wipers are driven by a 12 V electric motor. A relay is installed in the windshield wiper activation circuit. It is responsible for the intermittent operation of the wipers, which work without interruption or at intervals of four seconds.
The windshield wiper is connected in parallel through the contacts of the closer. They are located in the gearbox housing and are “responsible” for returning the brushes to their original position and abruptly stopping the motor. The driver controls the operating mode of the windshield wiper using the switch. The whole mechanism works thanks to a motor. It is prohibited to operate a car with faulty wipers, so car owners must ensure that they are in good working order. And in bad weather, driving with non-working wipers is very dangerous!
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Where is the wiper relay for VAZ 2107 located?
Where is relay in a VAZ-2107 car
Owners of the VAZ-2107 will have to re-equip and modernize the car in their own way, if, of course, there is a desire to improve the hardware to a probable standard. This also applies to the wipers, which demonstrate a leisurely cyclical movement.
A windshield wiper is designed to painstakingly clean the surface of the windshield, so if it works ineffectively, sticks and slows down, the road ahead in the rain or snowstorm becomes difficult to see.
The functions of the wipers are based on the supply of adequate power and the uninterrupted operation of the regulator. The last part is irreplaceable in the design of the wipers, so it is better for every VAZ- 2107 to know where the relay is located so that problems with it can be eliminated at any convenient time.
Where does which wire go, or just a diagram
Connecting wipers and washer
“Plus” power is supplied from the ignition switch through fuse No. 2 at 10 Amp of the mounting block. The permanent “plus” goes along the black and yellow wires to contacts “4” of the connectors of the gear motor and the steering column switch. It should not disappear even when the switch is in the “off” position. The blue wire supplies “+” 12 V power to the motor when the switch is in the “continuous mode” position. On the blue-white wire, in the “off” position there should be a “minus”, and in the “continuous mode on” position the “minus” is turned off. This is done to slow down the motor when the power to the closer is turned off.
The red wire supplies the relay with “+” 12 V from the switch when the intermittent mode is turned on. At the moment of operation, contacts “2” and “4” close, and “1” and “3” open, the motor starts working and the brushes make one or two movements. Then “+” 12 V is turned off, and contacts “1” and “3” are closed to each other and to “minus”. The motor stops for a few seconds and then the cycle repeats.
The washer pump motor is connected to “+” 12 V constantly with a black and yellow wire through the same fuse No. 2. “Minus” is applied when you press the windshield wiper lever from bottom to top.
Video about how a windshield wiper works
Replacing the fog light fuse
Proper operation of the fog lights is ensured by a fuse, which is located separately from the fuse box. It is located under the console center panel, next to the button for turning on the fog lights on the panel next to the radio.
To carry out inspection or replacement work, perform the following sequence of operations:
- Turn off the vehicle's power.
- Pull out the plastic insert on the console by squeezing it with a screwdriver to gain access to the fog lamp fuse housing.
- Remove the housing and check or replace the fuse link.
- Reassemble all the elements and switches in the reverse order to make sure the fog lights are working.
You need to use a screwdriver to disconnect the switches from the console in the place where the radio is installed, ensuring free access.
VAZ 2107 wiper malfunctions
Replacing a burnt out motor
During the winter season, at sub-zero temperatures, wipers often stick to the windshield. The wiper motor is under a lot of load, and it burns out if the bimetallic fuse does not work or the fuse burns out.
Location of the glass cleaner and washer fuse in the mounting block
In such cases, it is necessary to replace the motor. To do this, you need to remove all the parts in a certain order:
- Unscrew the fastening nuts;
- bend the lever and remove it from its seat;
- Using a 22mm wrench, unscrew the trapezoid fastenings on both sides;
- remove the plastic inserts;
- remove the hood seal;
- remove power from the windshield wiper motor;
- remove it with the drive from the hole in the body;
- bend the protective cover, unscrew the fastening nuts;
- press on the protrusions of the slots on the reverse side, on which the wiper arms sit, so that they fall inward, move in different directions, the trapezoid with the motor will come out.
Read, it may come in handy: VAZ 2107 bottom: replacing and overcooking the bottom, do-it-yourself repairs
Video instructions for replacing the windshield wiper trapezoid
After disconnecting the mechanism parts, you can repair the gear or install a new motor. But the electric motor must be inspected, even if it is in working condition. It is a conventional DC electric motor, the rotation of which, through a worm gearbox, is supplied to a trapezoid.
You should disassemble and repair the electric motor only if you are confident in your plumbing skills!
Walk over the collector with a cloth soaked in solvent. If there is a lot of wear, you need to change the armature or motor. Defects on the gear will require it to be replaced. Assembly occurs in reverse order. Therefore, before installing a replacement electric motor, you need to clean the trapezoid from contamination, lubricate the rubbing elements, motor and gearbox.
Trapezius problems
The trapezoid transmits rotational movements from the electric motor to the wipers and ensures the reciprocating movement of the wipers while cleaning the glass. Interruptions in the operation of wipers occur due to problems with the trapezoid; oxidized bushings and corrosion on the axles lead to jamming and slow operation of the mechanism. You can remove the trapezoid with a flat-head screwdriver. To set the correct position when installing the trapezoid, you must:
- set the motor to the initial position;
- place the crank and short rod parallel to each other;
- After that, attach the motor to the trapezoid.
Wiper relay not working
If the wipers fail to operate in intermittent mode, it can be argued that the relay has failed. First you need to check the power supply to the relay block. To do this, you need to remove the relay, turn on the wipers in intermittent mode, and check the voltage at the terminals. If no current flows, you need to repair the open circuit or replace the switch. The design of the relay is such that it cannot be repaired. So, if it does not work under voltage, you need to replace the part with a new one.
Wiper switch
To check the voltage supply to the switch, you need to remove the pads from the steering control or on the relay connection blocks. There is always voltage on the black-yellow wire. Check on the red and gray wires. If there is no voltage on one of them, then you need to change the switch.
Causes of fuse blown.
If the wipers do not work in two positions of the switch, then most likely the fuse has blown, which serves to protect the circuit from short circuits and overloads. When the wiper control lever is set to the off position and the blades do not stop at the bottom of the glass or anywhere else, the problem is in the gearbox. It is there that a special switch is installed, which ensures that after turning off the brushes remain in the desired position.
Due to heavy overload of the electric motor, overheating of the wiring, or exposure to water, the fuse may blow. Replacing it is easy, but the cause of the burnout must be found out and eliminated.
Causes of breakdowns
Among the most common are:
- Switch malfunctions.
- The fuse has blown, which happens when:
- if you overload the electric motor;
- allow water to get into it;
- if the wiring overheats.
- The cause of the malfunction is in the windshield wiper motor.
- The wiper relay is broken.
- There is no or intermittent contact in the circuit.
In the event that a fuse has blown, replacing it alone will not be enough; you also need to find the reason why this happened.
Why does the windshield washer not work?
All washer malfunctions are divided into two groups: electrical and mechanical.
Mechanical:
- Lack of liquid. In winter, you cannot use ordinary water, as it may freeze. If the water still freezes, you need to warm up the car engine and leave it in a warm room.
- The fluid supply hose may fly off or become pinched.
- The nozzles can also stop the washer from working. Poor quality of water and washer fluid leads to the fact that the fittings become clogged with dirt, rust, and washer fluid does not flow. The injectors are cleaned or new ones are purchased.
Read, it may be useful: Hood deflector
Electrical:
- Fuse F2(10A) has blown.
- The electric motor does not pump, no fluid flows, which means the terminals are oxidized. You need to clean the terminals and contacts and connect everything.
- Faulty switch. If the motor does not turn when voltage is present, then this is the reason.
- Check the pump motor by connecting it directly to the battery; if it starts spinning, then the fault is in the steering column switch.
System diagnostics
To understand the reasons for the inoperability of the windshield washer on the VAZ 2107, you should first of all consider the design of the system. It consists of the following elements:
- Washer fluid reservoir.
- A pump with an electric motor, which operates from a 12V network.
- Nozzles or sprayers of a water jet that hits the windshield.
- PVC pipes connecting the above elements.
A special liquid is poured into the washer reservoir, one type in summer and another in winter. Winter liquid is called “anti-freeze”, with its help you can effectively wash windows at sub-zero air temperatures, and not worry about the fact that it may freeze in the system.
When the washer is turned on, liquid is sprayed onto the windshield with the simultaneous automatic activation of the wipers. If, when you turn on the device, there are no signs of its performance, then you can determine the cause of the breakdown yourself. The electrical diagram for connecting the washer on a VAZ 2107 is presented below, based on which you can sort out the malfunctions.
We disassemble the turn switch for a VAZ 2107
And although many manufacturers of turn switches claim that this is a completely non-separable design, it can still be disassembled with some effort. Disassembly of devices is necessary when repairing it. It takes place in several stages:
- Using a 3 mm drill, drill out the 2 upper rivets and remove the upper part that is attached to the tube;
- After removing this part we see 2 more rivets that hold the ring;
- Carefully remove the ring from the grooves, then you need to remove additional rings and levers.
We repair the device
In the VAZ-2107, the switches are located under the steering wheel of the car. If you suspect a malfunction, the first thing you need to do is find out the reason why this or that function does not work.
Repairing the switch
We remove the steering column switch on the seven. Having removed the first ring, then the headlight, stop and wiper levers, we get to the mechanism by which the turns are automatically turned off. We take it out and here lies the cause of all the troubles: between the reeds there is a spring that breaks off and does not move the reeds in different directions. It is necessary to replace the spring; you can use a regular spring from a ballpoint pen. Next, we begin collecting all the rings and levers in reverse order. After finishing the work, we check how the levers and the turning mechanism work. To do this, we connect the pads and place the terminals on the battery; if all functions work, then we have completed the repair.
Also, the cause of a malfunction of the turn switch may be contamination or oxidation of the contacts. You can clean dirty or oxidized contacts; to do this, you need to slightly bend the “sagging” springs and other accessible parts. As a rule, after carrying out such cleaning manipulations, it is possible to restore the functionality of the switch.
What does the windshield wiper relay consist of?
The windshield wiper relay is shaped like a box, painted black, with a 15 cm long wire connected to it. If you start to disassemble it, you will see an electrical circuit board inside that contains the electronic components. They are assembled and connected to each other, taking into account the circuit developed by the designers, this circuit simply maintains the windshield wiper relay in working condition.
For a better understanding, let’s disassemble the windshield wiper relay device into parts:
There are a few more resistors, but they are not as important as the main one, located next to the controller in the lower right corner of the device. There are 4 connected wires on the board, through which signals from the VAZ-2107 wiper regulator are transmitted.
