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Makes perfect sense - "THANKS" ;) (archive)

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

Posted by NW on January 27, 2000 at 22:04:45:

In Reply to: Re: Foglight check control - Help (more) posted by Jim Cash on January 27, 2000 at 17:04:33:

: : My foglight check control (CHECK FRONT FOGLAMPS) comes
: : on for no reason. Then, I turn on my foglights and
: : the check control goes off????????

: : This has been going on for two weeks, every time I
: : start or turnoff the car - "CHECK FRONT FOGLAMPS"
: : always come on - the only way to shut it off is
: : to turn on my foglights (which of course work).

: : My dealership has no idea.

: : Anyone with a solutio? Thanks in advance.

:
: I would suspect a high resistance in the bulb connector, or a partially deteriorated filament in one of the bulbs.

: The system checks the bulb circuits when they are on, and whenthey are off. It does it whenthey are off by sending a very brief 12v pulse to the bulbs every 2 seconds - does not light the lights because the pulse is just a few milliseconds in duration. This is enough to check that the circuit is within resistance specifications.

: So if there is any corrosion in the connection,or the bulb is now beyond tolerances the system will report a fault.
: Applying fulkl voltage by turning on the lights will often overcome any small extra resistance in the circuit and your lights will seem to operate properly - but there will be a reduction in current and light due to the extra resistance in the circuit.

:
: Try cleaning the connections at the bulb, or replacing the bulbs.

: You have to pull off the small grill beside the foglight to get access. Remove small plastic rivits under top lip of grill piece and then just pull it out - pull hard.

: Cheers
: Jim Cash




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