Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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Let's ask a couple more questions. Maybe we can help.
When the car is running and you turn the headlights on, does the light remain lit?
When the headlights are on, are the low beams on or are the high beams on?
When you pull the windshield wiper stalk to flash the high beams, do the high beams work?
When you push the windshield wiper stalk to turn on the high beams, do the high beams work as they should?
Does the light on the dash go off when you engage the high beams or flash the high beams?
In simpler terms, do the headlights work as they should, and does anything you do to the headlights cause the light on the dash to turn off?
I'm looking for the most obvious problem--a miswired high beam light. If the light is on no matter what, the light (and perhaps some other stuff) may be wired into a hot circuit. I'm thinking when the air bag (it was the steering wheel bag, right?) was replaced, the light controller in the windshield wiper stalk was reconnected incorrectly. Alternatively, the insulation on the wiring may have been compromised and the naked wire is touching a ground source closing the circuit. The light is obviously hot all the time, so it seems to me there is a wiring mistake that happened somewhere in the reassembly process.
I'm no W202 maven; those are just my thoughts about the most obvious causes of your problem. A scavenger hunt to find the problem is likely to be costly either in terms of your time or your wallet, depending on whether you do the hunting yourself or pay someone to do it.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck