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Re: lack of "self-leveling system" - NOT ! (archive)

[ Follow Ups ] [ 5-series (E39) Message Board ] [ Msg. Board FAQ ]

Posted by Jim Cash on July 03, 2000 at 14:26:02:

In Reply to: lack of "self-leveling system" on aftermarket HID posted by JIMMY on July 03, 2000 at 13:56:50:


Jimmy - as shown by the messages from the other people, they are very aware it is an issue with the LCM (Light Check/Control Module) monitoring the resistance of the lamp circuit.

Please do not confuse the issue by making a technical statement that is not correct.

The "low beam fault message" has nothing to do with the "self leveling system".

I am not surprised that dealers do not know how to correct this issue when someone shows up with aftermarket lamps.
The LCM is set to look for a specific resistance in the circuits to the various lamps. If the resistance is outside the speck range, then you will get a message fault.

And many of the lamps are monitored in both their hot (ON) and cold (OFF) state. So you might get a failure message in one condition and not the other.

Dealers do not know how to compensate for an aftermarket installation that is not within the speck range. And I would not expect them to try and do so.

On top of that I think the later hardware versions of the LCM (and associated software) may have a slightly greater resistance range - so may accept some lamps that would fail in previous versions. (I am not sure of this but there have been several reports to that affect).

Jim Cash

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