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post #4 of (permalink) Old 16th November 2007
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Originally Posted by madnoel10 View Post
Hi Jamesy - this problem has come up before. The system monotors the lighting circuits for specified resistances and any changes will result in showing it as a fault. For instance thats how it knows when a bulb has blown. If bulbs with a higher or lower resistance are fitted it will show as a fault. This can be overcome by fitting additional resistors to the rear of the bulb holder.
As a matter of interest was your car fited with Xenon headlights from new and if so have you had any problems with the self-levelling system
Spot on. The system actually measures the current fed to the lamps. This and the battery voltage gives the resistance.
LEDs consume considerably less current for the same brightness than conventional bulbs. This means that the system thinks a bulb is out.
Whilst fitting a resistor in parallel will stop the false fault detection the system will probably not detect a true failure of the LED.

As a quick calcu;ation (based on a 5W bulb and 1W LED).

Resistance of bulb ~ 29R
Resistance of LED ~ 144R

Parallel resistance required ~ 36R
This will need to be a 4W resistor (4W + 1W = 5W)

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