Citroen C5 X7 2011 LED License Plate Lighting Issue: Not Turning On Automatically, Allegro Purchase

Question

Hello, I want to ask. My car is Citroen C5 X7 2011. I bought LED lamps to illuminate the register plates. from this auction from Allegro: / LED-array-Citroen-c2-c3-c4-c5-c6-berlingo-DS3 The lamps are nice, but I have a problem. The backlight does not turn on automatically when the engine is...

DiZMar · Answer

Does the voltage on the LED appear after starting the engine? If you cannot measure, connect LEDs and a traditional bulb in parallel. After starting the engine, what lights up?

Gomes 40 · Answer

After starting the engine, there is a short flash and they go out.

koks110 · Answer

And ordinary light bulbs used to glow normally before? Check if there is still voltage after firing on the wire, if so, something must be wrong with the led lights.

DiZMar · Answer

Does the voltage remain and the LEDs are off? Without a meter, you can check it with an ordinary light bulb. If the voltage remains, it is the fault of the LEDs. If not, and it appears only after the car's computer is turned off / on.

Gomes 40 · Answer

Yes, I wrote above that I connected the factory lamps with bulbs and they shine correctly.
I have the impression that the computer senses the LEDs and disconnects them.

Added after 1 [minutes]:

Tomorrow I will measure the voltage with the leds connected.

Krzysztof Kamienski · Answer

The light controller detects too low current consumption in the lighting circuit. Nominally, two 5W bulbs are 10W, that is ~ 0.8A. And LEDs? Less than half of that.

DiZMar · Answer

Why the LEDs consume less electricity. The linked auction is The driver should be cheated by LED lamps.

Gomes 40 · Answer

It's just like DiZMar wrote earlier, if I connected the light bulbs in parallel, it should be ok.

koks110 · Answer

The lights are probably without can and the computer can probably see the burnt bulb and turn off the power on them. You will need to replace the leds with stronger ones or add a condenser.

DiZMar · Answer

If this is the case, however, contrary to what I wrote, the fault may be on the LED side - they do not pretend to be light bulbs sufficiently. They do not cheat the driver in the car.

Marian B · Answer

And here is the problem that in the case of CAN control, it makes no sense to use LED instead of bulbs, because you need to ensure adequate power consumption by this LED bulb by adding, for example, a resistor, which does not make sense at all, because LED is used to save electricity . Using an LED and an additional resistor pretending to be a light bulb? A bit nonsense.
An imposing solution is simply a separate power supply for the LED. Actually, it is only one wire, because the mass already exists.

mariann · Answer

Hello I know about adding a resistor and how it works, but how does a capacitor help in this case and how should it be turned on? Best regards.

koks110 · Answer

Sorry, my mistake, it was supposed to be a resistor, something else I thought and wrote something else.

Gomes 40 · Answer

Thanks to everyone for your help. I will be looking for other lamps.

Szyszkownik Kilkujadek · Answer

@gomes 40 give it a rest and put them there, as provided by the manufacturer. By inserting LEDs in place of light bulbs, you risk even losing the registration certificate for a broken vehicle. PS One word: and so many varieties

Citroen C5 X7 2011 LED License Plate Lighting Issue: Not Turning On Automatically, Allegro Purchase

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