If I replace my 6w sidelights with longer life LED bulbs taking a few
milliamps, presumably the ship-board computer will think the bulbs have
blown and will continue to annoy me by saying so every time I turn them on.
Is there a way to tell the computer to expect low current drain from the
sidelights and not flag an error?
year 2000 E320 cdi
The normal bulb takes about 0.5 Amp And the LED probably 0.05 Amp
So the resistor in parallel with the led must take about 0.45 Amp to appear
normal, say 27ohm, and dissipate about 6 Watts.it may get as hot as a bulb.
If the LED fails, assuming it goes open circuit, the current will change by
0.05Amp and I doubt the computer will detect this.
I also doubt that Mercedes have the possible use of LED's programmed into
the current range of cars yet.
But it will come soon, probably with a model change and possibly with the
change to 42Volts which has often been suggested.
There will be a resistor in series with the LED but if it is a 12V LED it
will be inside the LED. If it is not a 12V LED the you will have to add a
resistor to limit the LED current.
I was referring to a resistor in parallel with the LED (or LED with series
resistor) which is added to deceive the car computer into thinking that a
normal bulb is fitted.
Thanks to all from the originator of this post. I understand that a
resistor in parallel to shunt 0.5 amp would fool the computer into
thinking there would be a normal bulb there. And, yes, there will be
another resistor insider the LED, but this is not my concern.
The trouble with this is that
1 an external parallel resistor would be difficult to install on the
2 there would be no warning of a bulb failure, though LEDs last a long time.
I had thought that I read in a thread on Xenon headlight bulbs that it
was possible to tell the computer to use different limits of acceptable
current. Is this really not possible?
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