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Wiring diagram for H4 lamp on a Japanese car. Correct connection of xenon equipment to block H4

The light source in most cars is a lamp with an H4 socket, providing low and high beam. This lamp can only be double-filament. If we are talking about switching to “xenon”, then the “H4” lamp must be replaced with a bi-xenon module. Inside such modules there is one light source, and it cannot change its brightness. The problem is solved by the presence of curtains and an electric drive.

What is bi-xenon?

Bi-xenon lamp white light with a slight yellowish tint

Note that if the lamp is covered with a lens, then the system looks like one sealed module (bilens). If there are no lenses, the design is called a “bi-xenon lamp”.

We disassemble headlights at home

Logically, the H4 bi-xenon installation cannot be done without removing the headlight assembly. We will not consider in detail how to dismantle headlights - each car has its own design features. We only note that the battery must be disconnected before dismantling. Which includes the following steps:

  1. disconnecting the DRL connector, turn signal,
  2. disconnecting the block from the terminals of the main lamp,
  3. as well as removing the hydraulic corrector.
  4. The fastening screws are unscrewed at the last stage.

The headlight modules themselves will have to be disassembled. This action is simple to perform. It is necessary to reach the temperature at which the butyl sealant melts. In general, the module must be placed in a box filled with hot air. And the source of air will be a hairdryer.

There is only one task - to melt the sealant

It is permissible to use only an industrial hair dryer. A diffuser - a wooden board - is installed opposite the nozzle. Carry out all the steps in order:

  1. The box is closed;
  2. Turn on the hairdryer (use minimum power);
  3. After 10 minutes, turn off the hair dryer and remove the headlight module with gloved hands.

When disassembling, use a flat-head screwdriver. The result of all work is shown in the photo.

All that remains is to remove the excess sealant

"Old" sealant applied around the edge of the reflector will interfere with assembly. Remaining sealant must be removed. And it’s better to do this before it cools down.

Modification of the reflector for bilens

The standard H4 lamp is attached to the headlight with a wire bracket. In order to install the bilens, the bracket is removed in any case. The same applies to all metal equipment. And the protrusions located on the back side of the reflector are cut off or broken off:

Additional hole is ready

Install the module on the reflector and secure it with the nut included in the kit. Then you need to align the lens by moving the module itself a small distance.

The module is connected to the battery via the adapter included in the kit

When the last operation is completed, the nut is outlined with a felt-tip pen. Then the entire structure is temporarily dismantled. Hot melt adhesive is applied to the points of contact between the reflector and the module and assembly is carried out.

In theory, installing bi-xenon with your own hands takes a few minutes. The main thing is not to forget about the hot glue stage. Otherwise, the xenon module will sooner or later shift.

The remaining question is how to assemble the headlight and how to connect it correctly.

Build process

Before assembling the headlights, the glass on the module is degreased. Pure alcohol or Secunda is used here.

Applying sealant to the headlight reflector

To carry out the assembly according to all the rules, you will need butyl sealant. The material is applied to the edge of the reflector, leaving no gaps. Instead of a liquid mass, sealing tape is also suitable (see figure). It is better to also treat the hole into which the wires are routed with sealant.

It will be necessary to perform “baking” again, but before that, an experiment is carried out. The adjusting screws are scrolled from one extreme position to the other. The bottom line is that the length of the cable running from the xenon module to the reflector must be sufficient. Otherwise, an unpleasant effect may occur - the wires will become short-circuited.

Butyl sealant must be “baked” in any case. Therefore, the assembled headlamp is placed in a box with a hairdryer and the steps indicated in “Chapter 1” are carried out. To avoid repeating everything again, keep the hairdryer on for 10-15 minutes.

After baking, the headlight should cool down. Cooling time – 2 hours. After this time, installation can be carried out; before, it is not possible.

Anyone who touches heated plastic with their hand can get burned. The problem will be solved by using gloves with pimples. Maximum caution won't hurt either. Happy installation.

Standard connection diagrams

Let's say a headlight with a bi-xenon module is already installed. Then, after connecting, it is adjusted using adjusting screws. In the meantime, let’s look at what the diagrams recommended by the manufacturer and relevant for bi-xenon look like.

Removable block contacts

The socket designed for H4 lamps is equipped with three contacts. One of them is “mass”. The cord going to the ground contact will always be in black insulation.

Perhaps the owner has two ignition units and one 5-pin relay. Then the connection can be made by implementing a simple circuit:

Circuit with one common relay

As you can see, only one of the two H4 connectors is used here. The other needs to be insulated.

The manufacturer often offers in the kit not only an ignition unit, but also a control module. The headlights are then connected as follows diagram:

Scheme with separate control units

From each line supplying the dimensions, the unit can read additional data. However, connecting these lines is not necessary.

When carrying out installation, follow these tips:

  1. There is no need to install a powerful fuse (30 A), shown in most diagrams - it is included in the standard wiring. Simply, connect to the line that powers the lights, not the accessories;
  2. High-voltage wires that go from the ignition unit to the headlight should not touch metal surfaces. Also, these wires cannot be bent into a loop - use an S-shaped laying;
  3. Once you have ensured that the headlights turn on, be sure to adjust the adjustment screws.

Today it is prohibited by law to operate a car without headlight level control. This applies to a greater extent to “xenon” light sources. Draw conclusions.

A simple action that causes great damage to any arc lamps is turning them on and off frequently. Therefore, in low beam mode, try never to “blink” your headlights. But this does not apply to the high beam - in this mode only the electric drive switches.

Everything except the last chapter in one video

Correction for reverse polarity

Reverse polarity of the base connection is implemented in many cars. The word “reverse” means that “plus” is applied to the common contact of the lamp (see figure).

The "reverse polarity" option is shown on the right

If the car uses reverse polarity, buy a universal bi-xenon kit:

Kit with two connection options

As you can see, the kit is equipped with an inverting jumper, as well as a control diode. When carrying out installation, follow the recommendations:

  • If switching between modes does not work, change the polarity of the diode;
  • If the switching does not work correctly, install a jumper.

No further explanation is required here. Happy installation!

Installation of bi-xenon lamps

A bi-xenon lamp is a module containing a lamp and a curtain. Appearance such a module is shown in the photo:

Bi-xenon module for H4 base

Such modules can be installed on a standard “mount”:

Bi-xenon lamp installation diagram

The bracket provided in the headlight design will press the metal part “A”. Then the remaining elements are attached to this part.

To mount a bi-xenon lamp, the headlight unit does not have to be disassembled or modified. Sometimes installation can be carried out without even removing the headlight from the car.

Before installing bi-xenon headlights, you need to make sure of the following:

  • The curtain or metal cap must not touch the headlight elements. That is, the dimensions of the module itself should not be too large;
  • If the glass has a standard reflector cap, use modules without a reflector. This rule cannot be broken;
  • The reflector cap, attached to the module itself, can usually be removed. And they do this in one case - when the headlight already has “its own” cap.

Let's look at what the proprietary bi-xenon module looks like:

Here the module is fully assembled

The numbers indicate the details:

  1. Reflector cap (removable);
  2. Reflector-curtain;
  3. Sliding curtain.

When high beam is on, the shade covers less of the surface. And vice versa.

When installing any electrical equipment, it is important to know: the battery terminal is connected last, when all connections are made. This advice is common, but it is often violated, leading to negative results.

Observe the following precautions when operating bi-xenon:

  • Be careful and try not to touch wires, blocks (ballasts), and especially bi-xenon lamps, both before turning them on and after igniting and starting work. At the moment of ignition, the blocks generate high voltage (23000V) and if you are in close proximity to the lamp or blocks, this voltage can break through not through the lamp, but through a body that is closer in mass to the weight of the car than the lamp.
  • To extend the service life of bi xenon lamps use them as needed; frequent switching on/off is negative for both lamps and ignition units. With this type of operation, the metal of the lamp electrodes evaporates more quickly, which can lead to failure of the ignition units.
  • If during operation you notice that the operation of the equipment is unstable and incorrect, or that traces of damage are visible on the equipment, stop using it as soon as possible and contact the installers at the service center. Using faulty equipment is dangerous and may result in fire or electric shock!
  • If the lights suddenly go out while the vehicle is moving, stop in a safe place and turn off the lights completely. After a few minutes, turn it on again. If the lamps do not work again, repeat the operation, but with a longer interval between turning on and off (about 15 minutes). If, after these steps, the headlights turned on and continued to operate in normal mode, then the shutdown was caused by an accidental failure and the protection in the ballast was triggered.
  • For the bi-xenon to work correctly, professional adjustment is required. Correctly set distribution of light beams will make the lighting as effective as possible and help avoid dazzling other participants traffic and occurrence of emergency situations. For your convenience and safety, adjustments are best done in specialized auto repair shops.

By installing bi-xenon yourself, without having the necessary qualifications, you are putting yourself in danger!

The installed components are high voltage sources; for their adjustment, repair or installation, use the services of qualified repair shops!

Precautions during installation:

  • IT IS NECESSARY TO STOP INSTALLATION IN THE following cases:
    - if damage occurs (due to a fall or other factors) to the ignition units or bi-xenon lamp.
    - if you notice signs of damage on the lamp or ignition units that were not your fault, you should also stop installation.
    - Do not install the bi-xenon with wet or dirty hands, as this may result in electric shock or equipment malfunction.
  • When installing equipment, carefully check the reliability of electrical connections.
  • For proper operation of bi-xenon lamps, it is unacceptable to apply great force to them, cause scratches or dirt.
  • When moving the bi-xenon kit, be careful not to hold it by the wires, this may cause damage to the equipment.
  • Turning on the system without headlights is strictly prohibited (except for situations where there is a need to verify the functionality of the system). In this case, you should not turn on the system near flammable liquids and objects, so as not to cause a fire.
  • If you touch the lamp bulb, carefully degrease the area with alcohol to avoid breaking it.

Before installation, you need to make sure that it is possible (based on the overall dimensions of the lamp).

The technology for checking lamp dimensions is the same for lamps with any sockets. IN in this case We are considering a lamp with an H4 socket. This bi-xenon lamp has a diameter of 15 mm. and flask length 56 mm. from the landing plane. If your car's headlight cannot accommodate a bulb with this socket, installation cannot be carried out. In this case, you must contact the seller for advice.

Size A must be at least 15mm.

Size IN must be at least 56mm.

The following cases are not considered malfunctions:

  • The left and right headlights shine in different colors (to a slight extent).
    Factory tolerance differences color temperature±500K lamps, that is, such a difference in glow is a normal characteristic of the glow. If the difference is significant, contact the seller of the product.
  • After turning on the lamps, their color changes quickly; this is a normal characteristic.
  • Ignition units generate high voltage, as a result of which noise up to 400 Hz can be heard.
  • Cases where, after quickly turning the lamps on and off, the subsequent switching on is unsatisfactory, this may be a consequence of the unit’s protection being triggered and is not a malfunction. The lamps will turn on after a few seconds.
  • Lamp failure. If the headlights are turned on first and then the engine is started, the light from the lamps may diffuse or turn off due to the voltage drop when the engine is started. The headlights need to be turned back on.

    • To install you will need the following tools:

    • Standard tool.
    • Insulating tape.
    • Alcohol.

    Bi-xenon installation diagram

    1. The wiring harness connection diagram is shown in the figure below.


    2. Circuit connection

  • To start, connect only the right side
  • Turn on the low beam

    • If the lamp lights up, but the “near/far” switching does not occur (the lamp is in one “far” position), remove the control diode, turn it over and insert it the other way around (the white arrow on the diode will point in the other direction). After this, check the “near/far” switching again and finish the connection. right side.

    If you experience the following problems when connecting, this indicates that the connection is incorrect:

      1.If the light switch is in the "low" position
      - the light lights up correctly / the lamp is in the “far” position

      2. If the light switch is in the "far" position
      - the light does not light up / the lamp is not in the “far” position

    These problems can be corrected by turning on the diode with the arrow in the opposite direction. This is shown in the following figure. Move the diode as shown in the picture and insert the inverting jumper. (see picture above)



    3. Perform the same actions (see step 2.) for the left side.

    Installation of ignition units is shown in the figure below.



    The installation of bi-xenon lamps is shown in the figure below.

    Instructions for installing bi-xenon on a car


    User Warning

    1.Do not touch HID lamps, ballasts and wires before and after turning on and entering operating mode. At the moment of startup, the ballast generates a voltage of 23000V and can cause a breakdown not in the lamp, which is the load, but on a body that is closer to the mass of the car than the lamp.

    2.Turn the headlights on and off only when necessary. Frequent switching on/off negatively affects the service life of the lamps and causes faster evaporation of the metal of the lamp electrodes, which in turn will lead to failure of the ballast.

    3.If you find damage to the equipment or its incorrect operation:

    Stop using the equipment immediately and contact your installation center. Use of damaged or faulty equipment may result in electric shock or fire.

    4.When the lights suddenly went out.

    Stop in a safe place, turn off the lights and turn them on again after a while. . If the headlights turn on normally, this means that an accidental failure occurred that caused the protection in the ballast to trip.

    5.Adjusting the headlights.

    Xenon headlights are twice as bright as halogen headlights. For this reason, improperly adjusted headlights can cause blinding to other road users, resulting in dangerous accidents. Set the correct distribution of light beams

    Installed equipment

    Because the equipment includes devices that generate high voltage, hazards accompany the installation of these devices. If you need to install equipment or replace faulty components, use the services of suitably qualified and certified auto electricians. Do not attempt to install the equipment yourself.

    Precautionary measures

    • If you drop or otherwise damage the HID lamp or ballast, discontinue installation and do not use the kit.
    • If you find damage to xenon lamps, ignition units or power wires, also stop installation
    • Do not install with wet or dirty hands. This increases the risk of electric shock and equipment damage.
    • Check electrical connections carefully.
    • Treat the lamps with care, do not apply excessive force to them, do not allow scratches or contamination.
    • Do not move the equipment by holding it by the wires.
    • Do not operate the system without headlights (except when necessary to verify the system's functionality). To avoid fires, do not operate the system near flammable objects or liquids.
    • After touching the lamp bulb, degrease it with alcohol.

    Checking the possibility of installing the system (checking the overall dimensions of the lamp)

    The lamp from the kit has a diameter of Ø 15mm and a bulb length of 56mm from the landing plane. The kit cannot be installed on a vehicle whose headlight cannot accommodate the bulb. If the lamp requires modifications before installation, contact your dealer for advice.

    Size A must be at least 15mm.

    Size IN must be at least 56mm.

    The following cases are not malfunctions:

    • The color of the left and right headlights differs slightly.

    Sometimes a slight difference in luminescence is a normal characteristic of the product. If there is a significant difference in color under steady state conditions, please contact your dealer. Factory tolerance is ±500Kelvin.

    • The color of the lamp changes quickly after switching on. This is a normal characteristic of the system.
    • Noise from ballasts. Noise with a frequency of 400 Hz occurs as a result of the voltage generated by the ballast.
    • Lamps do not turn on satisfactorily after they have been quickly turned on and off. This sometimes triggers the protection in the ballast and is not a fault if the lamps turn on after a few seconds.
    • Lamp failure. If the engine starts after the headlights are turned on, the light may scatter or turn off - this is due to a drop in supply voltage when starting the engine and is not a malfunction. Turn on the headlights again.

    Bi-xenon installation diagram.
    option 1 (depending on the equipment manufacturer)

    For bi-xenon kits without relay wires included, or with a separate relay wire on each side.

    1.Wiring harness connection diagram Fig.1



    2.Connecting the circuit

    · Connect the right side only

    · Turn on low beam

    If the headlight lights up but “low/high” does not switch (the lamp is in the “high” position), remove the control diode from the right side and move it the other way around (the white arrow on the diode will point in the opposite direction).
    Also try removing the diode completely
    Check that the "near/far" switching is correct and finish connecting the right side.

    The following symptoms indicate an incorrect connection :

    1.If the light switch is in the “low” position

    The light lights up correctly / the lamp is in the “far” position

    2. If the light switch is in the “far” position

    The light does not turn on / the lamp is not in the “far” position

    This means that the diode must be turned in the reverse direction. Move the diode,

    As shown in Fig.2 and insert inverting jumper (see Fig. 1)

    3. Perform the same actions (see step 2.) for the right side.

    The bi-xenon lamp is placed in place of the standard halogen lamp and connected according to the above diagram

    Bi-xenon installation diagram.
    option 2 (depending on the equipment manufacturer)

    For bi-xenon kits equipped with one relay wire for both headlights


    Checking bi-xenon performance:

    1. Start the engine and turn on the headlights
    2. Check the reliability of the lamp ignition and low/high beam switching
    3. Check the specified color temperature. A slight difference in the glow of the lamps is allowed (+- 500K)
    4. If necessary, adjust the headlights



    1. Do not touch the equipment during operation. Remember about high voltage 23000 volts!
    2. Do not start the engine with the xenon light on, this may damage the system!
    3. Do not turn the headlights on or off unless clearly necessary, this will negatively affect the life of the lamps
    4. Keep your headlight lenses clean, otherwise the light will scatter and blind other road users. Use headlight washer
    5. Remember that if you install bi-xenon without headlight washers and automatic headlight leveling, you will not pass the official inspection
    6. Respect other road users and adjust your headlights.

    You can always And