Before starting work, be sure to remove the terminal from the battery, as you will work in the immediate vicinity of the airbag.
Inoperable or absent heated steering in the winter turns driving into torture, causing the driver to convulsively squeeze cold plastic and lose the sensitivity of the fingers. Installation of heated steering wheel with their own hands is the most effective solution to this problem, if the standard configuration of your car does not provide such an option, and buying a new expensive steering wheel with already built-in heating seems inexpedient waste of budget. The procedure requires accuracy in disassembling the unit and minimal skills of working with a soldering iron, but the result in the form of a warm girth even in severe frost is worth it.
The main complexity of the process lies not so much in the electrical part, but in the qualitative and imperceptible integration of the heating element under the skin. Wrongly selected heater or a violation of the adhesive technology can lead to uneven heating or, worse, damage to the integrity of the steering wheel. In this guide, we will analyze in detail the choice of components, the connection scheme through the relay and fuse, as well as the nuances of disassembling modern security systems.
To implement the project, you will need a minimum set of tools: screwdrivers, soldering iron, multimeter, tape and thermal shrinkage. It is important to understand that circuitry It should be protected from short circuit, since the steering column is a zone of increased vibration. Weβll consider installing a versatile heater thatβs suitable for most car models, from budget sedans to SUVs.
Selection of heating element and materials
The first stage of any modernization is the selection of quality components, on which the durability and safety of the system depends. The market offers many options, but for self-installation, ready-made kits based on nichrome thread or graphite plates are best suited. Nichromic thread It has a high melting point and oxidation resistance, which is critical for a unit operating under temperature changes. Graphite elements, in turn, provide more uniform heating throughout the area, but they are more fragile when installed.
When choosing a material, pay attention to the thickness and flexibility of the substrate. Too thick a layer of heater can change the geometry of the girth, making the steering wheel uncomfortable, and also complicate the process of reverse stretching of the skin or alcantara. The optimal thickness of the working layer should not exceed 1-1.5 mm. Also an important parameter is power consumption: for a standard steering wheel with a diameter of 37-39 cm, a 15-25 W element is enough.
- π The heating element: Ready-made nichrome tape on adhesive basis or graphite mat.
- π Control button: General (if there is free contact) or universal with backlight.
- π‘οΈ Protective automationRelay 4 contact and fuse with a nominal value of 5-10 Ampere.
- 𧡠Wiring: Copper wire cross-section 0.5-0.75 mm2 in heat-resistant insulation.
Do not save on the wire, using thin veins, as when passing current they can heat themselves. For switching, it is better to use a multi-core copper wire that is resistant to constant vibrations of the steering mechanism. If you plan to plug in a button backlight, make sure the LED voltage matches the onboard network or use the appropriate resistor.
Dismantling of steering wheel and airbag
The most important and potentially dangerous step is the removal of the airbag. Before starting disassembly, it is necessary to de-energize the onboard network, throwing off the battery's negative terminal, and wait 10-15 minutes for the discharge of the safety capacitors. The design of the cushion mounting may differ: in some models (for example, VAG Group) end holes in the spokes are used, in others (many Asian cars) - screws on the back of the steering wheel, access to which is opened after turning the wheels.
After unscrewing the fixing bolts, the pillow is removed by moving on itself, but this should be done extremely carefully so as not to damage the plumes. Airbag connectors They usually have a bright yellow color and are fixed with latches. They must be carefully disconnected, remembering or photographing the position of the fixers. The pillow itself should be placed with the outside upwards so that in the event of an accidental shot, it did not cause injuries.
β οΈ Attention: Never leave the airbag removed connected to the network or lying down the connector. Keep it in a safe place, away from heat sources and static electricity.Then the central nut is unscrewed, holding the steering wheel itself on the shaft. Before removal, it is recommended to make markers on the shaft and hub of the steering wheel so that when assembled, it is installed smoothly, without skewing the spokes. Removing the steering wheel, you will get full access to the back side of the frame, where the main work on laying the wires will take place.
Disassembly of the steering wheel and frame preparation
For a high-quality heating installation, partial or complete disassembly of the steering wheel itself is often required to lay wires inside the spokes and bring them to the contact areas. In some cases, it is enough to remove decorative plastic linings on the spokes, under which the wiring of the horn and cruise control is hidden. Use thin plastic blades to avoid scratching glossy surfaces and breaking fragile latches.
If the design of the steering wheel allows, the heater wires are best stretched through the spoke cavity to the central part. This will hide the wiring and protect it from rubbing. In places of exit of wires from plastic it is recommended to use Cambricks or shrinkage for additional insulation. Steering frame it is necessary to clean from dust and degrease in places where the heating element will be glued using alcohol or a special degreasing agent.
Nuances of disassembly of composite rudders
In some sports steering wheels, the frame consists of two halves, fastened by screws. If you are planning a full retraction, it makes sense to take the steering wheel apart completely to fit the thread perfectly into the grooves. However, for simple installation of heating without stretching, this method is not required and can lead to a violation of geometry.
It is important to check the integrity of the existing wiring inside the steering wheel. Often in old cars, wires at the exit point from the turning part (cushion) have microcracks. If you find damage, they must be rebuilt by soldering before installing new equipment.
Installation of heating tape and soldering of contacts
The installation process begins with fitting the heating tape. It should fit tightly around the front of the rim, without creating bumps. Cut off the excess if the design of the element allows (not all types of nichrome can be cut arbitrarily, check the marking). The heating element usually has a self-adhesive base, but for reliability, especially in the cold, it is recommended to additionally fix the edges with a heat-resistant sealant or special glue for the skin.
The ends of the heating thread must be connected to the supply wires. For this purpose, soft soldering is used. The soldering place is necessarily isolated by a shrink tube, which is then warmed up with a hairdryer to a tight fit. The soldering joint It must be strong, as the steering wheel is constantly subjected to mechanical stress and vibrations.
Parameter Recommended value Critical minimum Chain resistance 6-12 Om. 4 ohm Cross-section of wire 0.75 mm2 0.5 mm2 Nominal of safety 5-7.5 A 10 A Melting point of insulation +105Β°C and higher +85Β°C After mounting the tape and soldering contacts, you need to βringβ the chain with a multimeter. The resistance must match the heater's passport data. If the device shows a break or short circuit on the mass (frame steering), the installation is made with errors and requires alteration.
βοΈ Pre-assembly check
Done: 0 / 5Connection scheme and button installation
Connection of the heated steering is carried out through a separate button and relay. Direct connection to the onboard network without relay is unacceptable, since the currents of consumption can lead to overheating of the regular wiring of the button and its melting. The connection circuit is standard: one contact of the relay (85) goes to the mass, the second (86) - to the control wire from the button. Contact (30) is connected to the plus of the battery through the fuse, and contact (87) - to the plus of the heating element.
The control button is most convenient to cut into the free niche of the torpedo or use the regular place, if the design of the panel allows. To connect the power buttons often use wiring from the lighter or position lights (if you need a backlight button). It is important that the button is switched on only when the engine is running or the key position is in place.
ACC/ONTo keep the battery from running out.
- πΉ Plus wire: Driving from the battery through the fuse to the contact 30 relay.
- πΉ ManagementFrom the button, we send a signal to contact 86 relay.
- πΉ The loadFrom contact 87 relay lead to the heater in the steering wheel.
- πΉ GroundingMinus wire heater and contact 85 relay planted on the body.
All connections in the cabin are desirable to perform by twisting with subsequent soldering and isolation, or use high-quality crimping terminals. Laying the wire from the cabin to the steering column should be carried out through existing corrugated to avoid rubbing when rotating the steering wheel.
Use only copper wires. Aluminum alloys quickly break down to bend and oxidize, which will lead to a system failure after six months of operation.
Assembly of the node and final inspection
After successful testing of the system in disassembled form (short-term on for 10-15 seconds to check the heating), you can proceed to the final assembly. Set the steering wheel on the shaft, combining the marks, and tighten the central nut with the force indicated in the manual (usually 30-50 Nm). Connect the airbag connectors to a characteristic click and set it in place, fixing with bolts.
Check the horn and other buttons on the steering wheel. Then plug in the battery. When the ignition is turned on on the heating button, the indication should light up (if it is provided), and the steering wheel itself will begin to heat up. Full access to operating temperature takes from 1 to 3 minutes depending on the upholstery material and ambient temperature.
β οΈ Attention: If after assembly the Airbag error lamp on the dashboard lit up, then the cushion connector is not fully connected or the plume is damaged. Operating a car with a burning safety lamp is prohibited.It is recommended to conduct several on-off cycles to ensure the stability of the relay and the absence of spontaneous shutdown. Also check if the connection points of the wires in the steering column are warm.
Typical errors and troubleshooting
In the process of self-installation enthusiasts often make a number of mistakes that negate all efforts. The most common of these is poor insulation of the contacts, which leads to oxidation and resistance growth at the joint site. Another common problem is using a heater that is too powerful to melt the glue under the skin or make the steering wheel too hot for a comfortable grip.
Sometimes users forget about the thermal shrinkage in the soldering places inside the steering wheel. Over time, vibration leads to the closure of the nichrome thread on the metal frame, which causes the fuse to burn. It is also worth mentioning the error when choosing a place for the button: if it is installed in a difficult-to-reach place, the driver will have to distract from the road to adjust the temperature.
- β No relays: Leads to overheating and melting of button contacts.
- β Weak safety lock.: Causes constant chain breaks at peak loads.
- β Polarity violation: Not critical for the heater, but important for the backlit button and diodes.
If the heating works intermittently (disappears), check the integrity of the wire at the place of transition from the column to the steering wheel (in the βsnailβ or contact ring). It is this area that experiences maximum mechanical stress during rotation.
Can I install heating without removing the steering wheel?
Theoretically, you can use thin graphite heaters that are glued on top of the skin. However, this option is considered temporary and less aesthetic. In addition, without removing the skin is difficult to secure the wires, and the risk of damage during operation.
How long does it take to install heating with your own hands?
An experienced master with all the tools the process takes 2-3 hours. For a beginner who is taking apart the steering wheel for the first time and looking for connection points, the time can increase to 5-6 hours, including time to search for information and neat assembly.
Is it safe to use universal heating kits?
Yes, if they are certified and have the appropriate markings. The main thing is to comply with the connection scheme and not exceed the permissible power. High-quality universal sets are often more reliable than standard solutions in budget cars.