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Rear headlights Vaz 2108, 2109, 21099 - causes of failure, replacement process

November 28, 2019

The operation of the taillights of any car due to road safety is essential. These devices behind the machine perform a lighting and information function (warn road users about the movement of cars).

On the VAZ 21099 and other models, the headlights turn on automatically when shifting gears and moving the car back.

Structurally, the lights behind the car combine the following components of the lighting system:

  • reversing lighting;
  • dimensional lighting;
  • stop signals;
  • turn signals;
  • alarm system.

Rear lights for VAZ 21099

The structure of lighting devices is as follows:

  • frame, made mainly of plastic (in some cases - of glass);
  • lampholders;
  • latch for holding wires;
  • light diffuser for uniform illumination of the road surface. Glued to the back of the product, so in case of breakage it needs to be replaced together with the case.

The device of a back headlight on VAZ 2109-2108 and 21099

In VAZ 2108 or 2109 the following types of taillights can be installed at the rear:

  • incandescent lamps. Inexpensive, but they fail relatively quickly and are not bright enough. Such lamps light up yellow, which in adverse weather conditions is not very visible;
  • halogen bulbs. Considered more modern and durable, because air is pumped out of their flask, and inert gas is pumped. Models with H1 and H3 plinths are available;
  • LEDs. Burn with cold white light, serve several times longer than incandescent lamps. Implemented by tapes and today are often replaced by obsolete incandescent lamps.

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LED taillights on VAZ 2108

Causes and actions in case of breakage

Among the reasons for the breakdown of the rear parts of the lighting system on the VAZ 21099, 2108 or 2109 the most common are:

  • Light bulb burnout. Occurs due to wear or surges and is almost the most common reason for replacing rear lights.
  • Oxidation of contacts. Occurs due to poor contact quality of the terminals, electrolyte leakage, cracks in the battery case.
  • Fuse failure. This cause of failure is due to ??voltage drops.
  • Reversing sensor failure or breakage of its wiring.
  • Burning contacts on the headlight film.
  • Absence on the board "mass".

The most common and easy to solve problem is a lamp burnout. The product must be replaced with a new one, turning off the light sources, by opening the boot and disconnecting the wiring harness.

For this you, probably, will have to remove the upholstery of the trunk of VAZ 2108 or 21099, which is located behind the lantern. After this, squeezing the latches (they are located on the sides), you need to get the panel and unscrew the lamp, pre-clicking on it. Follow the reverse process to install a new rear lamp.

Replacement of lamps in VAZ taillights 2109

To clean the contacts from white plaque, which accompanies oxidation, they need to be cleaned. To do this, remove the headlight unit. The "mass" must be returned to its place, and the adjacent wiring to test for correct operation. Fuse on VAZ is broken 2109 and 21099 easy to find - their scheme is usually presented ??on the cover of the unit.

If you are faced with the problem of constantly burning reversing lights, this may be due to problems with the wiring or shutdown of the special sensor, which is located on the box.

When the car headlight switch stops working, it can be accessed through the engine compartment or from the bottom of the car. The breakdown of this component of the lighting system can be diagnosed as follows:

  • start a VAZ 21099 and shift it into reverse;
  • close contacts. The taillights must flash;
  • check with a multimeter the presence of short circuit contacts when turning on the taillight switch, pre-removing the switch;
  • make sure that the contacts are soldered, assemble the switch and test it again. If a normal short circuit is observed, put it in place.

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