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Old 04-30-2011, 09:39 PM
Chief Village Id10t
Join Date: Aug 2010
Location: Houston, TX
Posts: 356
Question What is that last light bulb for?

I had a tail light go out, so I opened the rear lamp assembly for the first time to replace the bulb.

There is a small light bulb (6W) on the outside corner of the light bar which is angled to the side of the car. I tried lots of combinations of key and light switch positions, but I never got this bulb to come on. I gave it a quick look; it appeared OK but who knows.

When is this light supposed to illuminate? I think I read somewhere its called a "side illumination bulb".

Mike Frederick
1986 300SDL, 240K+ miles
1985 300D KaliKar, 270K+ miles
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Old 04-30-2011, 09:40 PM
babymog's Avatar
Loose Cannon - No Balls
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
Whenever the running lights are on. Side marker bulb.

Gone to the dark side

- Jeff
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Old 04-30-2011, 09:45 PM
pawoSD's Avatar
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,323
The filament likely has a hairline split in it, thats how they generally fail. No one seems to realize that the W123/W126 have a lamp there.
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 90k - mine - (OC-91,200)
'17 Metris(VITO!) - 18k - wifes (OC-25k)
'01 E320 Wagon - 161k - mine (OC-165,000)
'01 E320 - 180k - dad's (OC-182,500)
'07 E350 Wagon - 134k - dad's (OC-139,500)
'01 SL500 - 56k - dad's (OC-59,000)
'16 E400 4matic Sedan - 81k - Brothers (OC-88,000)
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Old 04-30-2011, 09:46 PM
compu_85's Avatar
Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
And note that they only come on with the running lights or headlights, the one side only standing lights do not activate the side markers.

1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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Old 04-30-2011, 10:12 PM
Yak Yak is offline
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Join Date: Aug 2009
Location: San Antonio, TX
Posts: 1,711
Try turning the headlight switch two clicks to the left with the ignition off.

If that works, then it's the "standlicht" or "parked by the side of the road at night so you turn a light on so nobody hits you" light.
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Old 05-01-2011, 12:37 PM
Registered User
Join Date: Dec 2009
Posts: 60
those little bulbs often get corrosion on the lamp housing terminals. i deleted mine on the drivers side when i installed my euro spec rear light. if anyone has a eurospec passenger side, let me know.

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