Low Beam not working - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 04-27-2015, 05:03 PM Thread Starter
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Low Beam not working

hello, i have a Mercedes 2003 CLK320 coupe W209 model with a xenon halogen
headlight. The low beam bulb is not working. i replaced it with a new one as well as
using the other known good bulb and still does not work. Could it be a ballast problem?
How do i confirm this is the problem that needs replacing? I understand you have to
remove the bumper just to access the headlight assembly. thanks for your help.
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post #2 of 10 (permalink) Old 04-27-2015, 07:50 PM
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If it's not the bulb, then it's probably the igniter. Unfortunately, the "official" repair is to replace the entire headlight assembly. The cost of the part is north of $1000 plus several hours of labor. Removing the front bumper is not that big of a deal - maybe an hour to remove, another to replace. There are other options for repair (still requiring removing the bumper and headlight) such as igniter repair kits or an aftermarket headlight.

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post #3 of 10 (permalink) Old 04-28-2015, 05:38 AM
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ballast

Just replaced both ballasts.

Remove bumper- pull out headlight, turn over replace ballasts that ar on the bottom, reinstall.

About one hour.

Ballasts are $500 plus on line for new Mercedes, $150 new on EBAY and $100 used on ebay.

Not difficult to replace - just somewhat time consuming and takes various size screw driver types.

Note: mark headlight level on a convenient wall before removing headlight to do check after replacing.
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post #4 of 10 (permalink) Old 04-28-2015, 05:40 AM
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Xenon halogen??

Question?

My previous note was for HIDs- which have ballasts.

If you have the standard halogen headlights- my reply would be non applicable.
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post #5 of 10 (permalink) Old 04-28-2015, 06:48 AM Thread Starter
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Thank you for your reply degeja. Yes i can see the ballast from underneath the headlight assembly.
So most likely this is the culprit? i hate to think it is the igniter which is built in to the assembly.
I would rather stretch for a used ballast before investing in a whole headlight unit.
post #6 of 10 (permalink) Old 04-28-2015, 07:26 AM
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one ballast

you can do one ballast without taking the whole bumper off-

do the one side totally and the other side only the front bolts- then bend the flxible bumper enough to get the headlight out-

dont need to unplug the electrical connections(very tough sometimes for some reason) but can just cut the plastic ties on the cables.

The igniter cables can also be replaced but most of my reading(and experience) is the ballast.

After changing the ballast- you can check the headlight function before reassembly.
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post #7 of 10 (permalink) Old 04-28-2015, 12:16 PM
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You might be right about a faulty xenon control unit (you call it a ballast) but take a look at the WIS schematic below.

This shows that the xenon control module drives the low beam lamp, the high beam lamp, the range adjustment motor, and the high beam solenoid. So if it is toast, all those items should fail.

The xenon ignition module only drives the low beam lamp.

Btw, if you have Code 614 you have bi-xenon.
Attached Files
File Type: pdf W209 bi-xenon ext lights.pdf (225.6 KB, 160 views)
File Type: pdf W209 xenon.pdf (583.6 KB, 170 views)
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post #8 of 10 (permalink) Old 04-28-2015, 12:36 PM
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headlights

My car with xenon HIDs

Mercedes code 614 BI-XENON*HEADLAMPS*FOR RIGHT-HAND TRAFFIC

NOT halogens or xenon halogens:

One bulb is bit hi and lo beams;


From the manual page 414 it is

bi-xenon headlamps high and low beam bulb type D2S 35W

which are an option on my 2005
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post #9 of 10 (permalink) Old 04-28-2015, 12:42 PM
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The pictures you show are a different year version than mine.
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post #10 of 10 (permalink) Old 05-01-2015, 12:35 PM
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Quote:
Originally Posted by degeja View Post
The pictures you show are a different year version than mine.
OK.

For model W209, my WIS does not show a circuit for your xenon/low and halogen/high combination. It only shows either ALL halogen, or the bi-xenon design.

I knew that the W208 could have your arrangement, but your information about this on a W209 is news to me.
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