ALEKSCLK

Looking for some help. I have a 2003 clk500 with the xenon lights. I've been to the the dealer three times so far, going on my fourth visit. Replaced the right xenon bulb, replaced the ballast, replaced the SAM unit. The light still will not consistently work. When I turn my lights on, it either works fine or does not work at all. How can I resolve this problem? Thanks for your help.

redcoupe

You need to change out the headlight control unit.

Ausmbtech

There is a wiring modification for the headlamps. The wiring to the headlamp has poor contacts. The dealer should be able to find this for you. Best to do both sides at the same time

alcool

I tried a search but couldn't see a write-up for this. Is it a potential DIY solution? I'm having the same problem in my CLK,.. when I turn on the switch, they either both fire, or only 1 of them fires. Playing with the switch does not change anything. I have to actually turn the car off, and back on again.. at that point, they will both work.

Sounds like bad wiring / relay type issue indeed!

- Alex

Ausmbtech

I'll check the part numbers for you when I get back to work next week. What model and year are youre vehicles?

alcool

That would be awesome, and much appreciated! Mine is a 1999 CLK 320 (Canada, if that matters).

On a somewhat related note, I've been reading conflicting responses as to whether my car would have the auto-levelling headlight system or not?

Thanks again,

- Alex

Diesel Benz

All MB cars with xenons from the factory have auto-levelling. You would notice it from the fact that you don't have the manual head lights level control dial switch next to the lights switch. Cars with xenon lights should come with washers too.

alcool

Then that should confirm that I have them... I don't have any manual adjustment inside the car, and I do have the nozzles in the bumper as well.

Question is, how exactly do I know if they're working or not?! They were WAY off when I bought the car, and so I manually adjusted them using the knobs on the lamps themselves. What throws me off though is that when I'm on a bumpy road for example, the lights bounce around with the front-end of the car, whereas I would assume that 'auto-levelling' ones would continue to remain level regardless of the travel of the car's suspension??

Any suggestions on how to diagnose? Thanks for all the help!

- Alex

Ausmbtech

Sorry for the delayed reply.

Check the sticker on the top of the headlights for the build date of the lights. For the 209 any light assemblies built after 28.4.03 then the usual light diagnosis path applies.

For all assemblies built prior to 28.4.03 then there is a known fault with the ignition module. The replacement part number of the ignition module is A203 820 1112 05 (1 per side) and solder connector A002 546 1341 (3 per side).

The new module needs to have the wires soldered into the old wiring.

This only recitifies lamps that intermitantly aren't working, when they perminately don't work then you need to ensure that all other components are functioning first.