Car interior heater control unit: specifications

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42

The heater control unit is necessary for the high-quality operation of the car's stove in the winter. Only under the condition of the normal functioning of the heating system will the driver and passenger be as comfortable as possible. Even in the most modern models of domestic cars, the heating system is one of the most vulnerable parts. Component failure is very common. In the summer, drivers usually turn a blind eye to malfunctions, but with the onset of the first cold weather, corrective measures must be taken.

Before starting repairs, it is necessary to carry out diagnostics in order to understand which particular component in the heating system has broken down. The easiest way is to go to a service station where an experienced car mechanic will help you in troubleshooting. Of course, you will have to pay a tidy sum for diagnostics. But on domestic cars, all repair work can be done independently so that the autonomous heater works,as expected.

Features of the control unit

Very often, when the stove is not working, it turns out that the malfunction lies in the control unit. VAZ-2110 injection cars, for example, come from the factory with microcontroller automatic heating control systems. If one or more fan modes suddenly refuse to work, then the malfunction lies in the control unit.

With the help of an electronic system inside the cabin, the temperature set by the driver will always be maintained. Of course, the air will not be cooled in summer. But in winter, the stove will perfectly warm the air in the cabin. On VAZ-2110 vehicles manufactured before 2003, an old-style stove is installed. On them, the heater control unit (2110) has a different design and is not replaced by new devices.

Right control handle

The electronic unit consists of a microcontroller, which receives signals from the handles on the front panel. The right switch is needed in order to set the desired fan speed. A resistor is installed in the stove, with the help of which the engine speed is adjusted. If an old-style stove is installed on your car, then there are several resistances that are designed to adjust the rotation speed. But the new-style stoves are equipped with modified resistances.

Left control handle

The handle located on the left is needed to select the temperature in the car. Depending on whether inwhich position the handle is in, a signal is sent to the damper electric drive about what temperature it is necessary to set. The microcontroller adjusts the valve position. The regulator allows you to set the temperature from 16 to 30 degrees Celsius.

On cars until 2003, stoves were installed that had controllers with four and five positions. At the moment, you are unlikely to find them on sale, as the products have been discontinued. Please check which heater control system is installed on your vehicle before purchasing replacement parts needed for repairs.

How to diagnose the system

The control system module is located in the center console. It is possible to repair the heater's electronic control unit, but only if you have at least general knowledge of electrical engineering. The easiest way to check the he alth of the device is to replace it with a known-good one (borrowed from a car with the same heater). Before replacing blocks, be sure to disconnect the negative terminal from the battery - this will avoid a short circuit in the power circuits.

No other diagnostic methods are provided, you can only visually assess the condition. If there is damage to the case or board, then the device will not be able to work normally. The slightest damage to the printed circuit leads to the fact that the entire control system stops working, giventhe temperature is not maintained at the desired level.

Dismantling the device

To remove the device, do the following:

1. Remove the buttons located on the sides of the stove.
2. Turn both knobs to the positions corresponding to "0" (fully counterclockwise).
3. Now you need to carefully pull out the module.
4. As soon as the wire connection blocks appear, carefully disconnect them.

Try not to damage the wires during work, otherwise even a new, fully functional heater control unit will not be able to function normally. Installation is in reverse order.

Moreover, you can only connect the wires and check the performance of the entire system with a new device. If the heater still does not work, then you will have to look for a malfunction in other components of the car's stove.

How to disassemble the device

If during the diagnosis it turned out that the VAZ-2110 heater control unit is faulty, then you can try to repair it. Of course, it is best to install a new element. But its cost is quite high, and malfunctions in the device circuit are usually very simple. You only need to have basic knowledge of electrical engineering, as well as be able to use a soldering iron and a multimeter. Before starting work, be sure to disassemble the control unit.

Since the block has already been dismantled, it remains only to disconnect the frontthe cover that contains the controls. After that, it is necessary to detach a special glass lining. Next, use a screwdriver to unscrew the two screws that are on the front panel. Another one is located at the back. Then carefully remove the top cover of the control box. Be careful not to damage the contacts and parts inside the device.

Checking circuit elements

Inside the case you will find a printed circuit board with jumpers, contacts, resistors, microcontroller, capacitors. They are responsible for the normal operation of all heating systems. The GAZ-3110 heater control unit consists of the same elements. There may be such breakdowns:

1. Carefully examine all elements to detect damage. Very often, high temperatures heat up the printed circuit board, causing the contacts to disconnect.
2. It is possible that only soldering the joints will be enough for repairs.
3. Take a closer look at the paths that supply power to the electrical circuit. If it has damage that is visible to the naked eye, then this problem should be corrected.
4. In the event that capacitors or resistors are damaged, new ones must be installed in their place. To find out their parameters, you need to use the literature, which describes in more detail the scheme of the heater control unit.
5. If there is no visible damage, then it is necessary to check the operation of all resistors in the circuit with a multimeter, as well as the connection of the elements. In other words, you just need to ring all the tracks.
6. After eliminating all the breakdowns that have been identified, it is necessary to connect the product to the power supply. Then put the multimeter into voltage measurement mode. Check the test points on the board for power.

After repairing the unit, it is necessary to assemble it in the reverse order and install it in place. After connecting power to the battery, check the operation of the entire system. If it has not recovered, then you will have to replace the heater control unit.

How to adjust the microcontroller

It is provided that he must warm up the interior to the temperature that the driver sets, no more than 15 minutes. Moreover, the permissible deviation is less than 2 degrees Celsius. The driver sets the desired temperature using the knob. To check the correct operation of the heating system, you must use a mercury or digital room thermometer. Set the desired temperature, then turn on the heating.

Watch what readings the room thermometer gives. If after 15 minutes the set temperature is not reached in the cabin, it will be necessary to adjust the controller. The procedure is quite simple: you just need to pull out the entire module, then turn the temperature control knob to the maximum, then in the opposite direction. After this simple manipulation, it is necessary to install the device in place. Check if the heater control unit is working properlysalon.

Heater flaps

Check how the dampers in the stove work. If there are extraneous sounds during the switching of the temperature mode, then be sure to check whether the dampers work correctly. In the event that cold air enters the cabin from the outside without problems, but hot air does not pass, then most likely the problem lies in the lower damper.

If hot air enters the cabin normally, but cold air does not pass, then the malfunction is in the upper damper. On all cars of the tenth model, dampers very often fail, as they are made of plastic. Under the influence of temperature, this plastic is deformed, as a result of which the flaps stop moving. It would be much better to install aluminum dampers instead of regular dampers, they are resistant to temperature changes.

Conclusion

You can independently perform minor repairs to the electronic unit, but if you have the slightest knowledge of electrical engineering. It is also desirable to diagnose all electric drives and the condition of the dampers. It often turns out that hot air does not enter the car interior heater due to a faulty filter: leaves or other objects got inside. Carefully monitor the condition of your car and try to change all filter elements in a timely manner. Only in this case will the heater be completely autonomous, your intervention during operation will not be required.