1997 C230:

My "light-out" indicator has actuated on my C230. I've checked headlights, tail-lights, turn signals, brake lights... [have not checked backup lights].

Does it show a fault when an interior light fails?

No, it doesn't show a fault with interior lights. If there is a bulb of the incorrect wattage installed somewhere, then the current draw will not be correct and it could make the system think there is a burned out bulb somewhere. But first, check the backup lights to make sure it is not one of those.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record

Try the elimination process. Turn car off and restart. Light should not eliminate. Turn on parking lights - check indicator. Headlights - check indicator (then high beams). Hit Brakes - check indicator (don't forget 3rd brake light).

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97 S500
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or the rear side marker lights

In my experience with the "bulb out" warning light, it was always a turn signal. Just replace them, they are cheap!

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1996 SL320 97K miles
1996 C220 130k miles
1992 500SEL 170k miles <---sold
1986 300E 216k miles <---sold

I was going crazy with the same problem checking the rear lights with the trunk open- until our 7 year old asked why the window brake light doesn't come on anymore -- do I feel dumb !