LittleRockAuto

Customer brought us an 01 C240 with standard halogens and they purchased a set of projection headlights. Factory plugs fit but lights aren't working, any suggestions?

pcy

Bulbs in the new projector lights may be no good. Swap the bulbs from the standard halogen lights to the new headlights and see if they light up.

LittleRockAuto

None of the lights are working, i believe i've come to the conclusion that they are the wrong headlights for this car, as the turn signal wiring is integrated into the new headlight, and separate on the old one. We currently have no lights at all.

pcy

are you saying that the old (standard halogen) lights are not working either? Then, fuse may be blown.

LittleRockAuto

No, I'm sorry, the factory lights work properly, when the new lights are plugged in, none of the bulbs in that housing work.

Glyn M Ruck

Are you getting a "malfunction" warning on the dash display.

Glyn M Ruck

This is a conversion from Halogen to HID - Yes? If so where are the balasts? integrated?

This thread might be of help but it very long.

https://mbworld.org/forums/c-class-w203/188766-aftermarket-hid-conversion-kits-required-setting-xenon-present-thread.html

pcy

Glyn, based on the info given by the OP, the new lights are just the projector type lights. I don't think they are HIDs...

Glyn M Ruck

Yes - I'm just trying to clarify - because my memory is failing me but I remember in the dim distant past that the Halogen wiring actually changed between 2000 & 2003. I suspect that the wiring is just wrong. This should throw a malfunction warning.

I learned a long while back on this forum not to assume anything.

e.g. presume that lamps are in fact fitted to new light housings ???

fookoo303

As Glyn said, it Sounds like a harness problem. The wiring must not be mating up properly. Also, with the separation of the turn signals, the owner probably bought the updated harness, which is hard wired to the electrical system.

samaritrey

Glyn are you sure they changed the harness because my 01 is know rocking bix headlights date stamped for 05 and work perfectly. I do have one that has the hardwired turn signal light but the other side does not have that. i have heard that on some aftermarket light that the pins inside bend and that is why you don't get any lights coming on i would find the pin out for the lights and test them out outside of the car then work on the pins. GL

LittleRockAuto

Thanks for your helps guys, yes, it is just a projector conversion, not HID. It seems as though the wiring is wrong as when they are both plugged in it sets a code for all of them. I also learned that you can't go old school and just unplug and check the wires individually with a test light because the computer won't send voltage to them if it sees an open in the wiring. Guess I'll start switching things around until i figure it out.

1st lite

I have a 2002 C240 with the frosted halogens that I swapped out and installed the clear lense halogens from a 2007. I know the turn signal wiring is integrated (built in) to the newer headlight assembly and the older headlight units have the seperate wiring to the turn signal.
What I did is use the fitting (turn signal) from my old housing and used it in the new headlight assembly. There are 4 contacts in your wiring harness and 4 contacts in the early light assembly. The later headlight assembly has 5 contacts in the housing. So you have to use the fitting from the original turn
signal. That is your 5th electrical contact.
Check the bulb holder from both turn signal assemblies. You will see the newer one will have metal contacts around the outer part of the housing and the older one doesn't.
Hope you understand my explanation.
It worked for me, I haven't had any problems since I changed my headlights.
I have photos somewhere if you need to take a look. Good Luck.

samaritrey

you can run 12v to the new lights to test them out though. the car is obviously working fine because the old lights work so no need to test that.
My 01 had the metal connectors in the light for the turn signal. But Mercedes put out a fix because they had issues with it. so they spliced the connector and made it hard wired into the light. So originally your 02 had them both thought the light then they switched it to the direct wire style to fix the issue. My car has one hardwired and one normal.

What brand are the projectors because like i said the pins in some of the lights were pushed to far back or bent wrong and that might be why there is nothing working

LittleRockAuto

Solved the issue yesterday afternoon. It ended up being that whoever wired the headlights at the manufacturer had the ground and the HB in the wrong slot in the harness of the headlight, so I ended up switching them out. Trial and error with a set of test leads got it all figured out. Thank you for all of your help. And I'll see you next time.

samaritrey

Oh great

Glyn M Ruck

Good news

patrickkc

I too am having this problems with my new DEPOs I just got. My turn signals are wired separately. Upon plugging in the DEPOs, the lights don't light up and I get low beam L.R malfunctions and high beam L.R. malfunction

I tested these DEPO lights on a C32 AMG and they work.

Even the ebay seller is baffled.

samaritrey

Sounds like you might need the xenon= present setting done but that doesn't explain why the high beams don't work.
Try plugging them in and turning them on with the key out of the ignition. The car doesn't check for proper voltage and if they work then the setting is your issue.
I suspect the c32 has xenon lights and even if it doesn't some cars seem more sensitive about voltages accepted than others.

patrickkc

Thanks,

It doesn't make sense to me either. These lights are made for halogen headlights.

The seller is just as baffled as I am.

patrickkc

I still have not figured out what's wrong with my headlight and why plugging them in doesn't work.

I have reread a few threads and looks like some of the pins maybe in the wrong place thus the DEPO headlights not lighting up at all in my C240.

Also as for coding, I was not able to code my car at all. STAR does not read / cannot connect with my car. No idea as to why.

I've had these lights sitting here for a year and a half now.. still not installed.

SunnyRayToronto

At your car's OBDII connector under the driver-side dashboard, unscrew and remove that little plastic door & surround trim that cover and goes around the OBDII connector. This will allow the OBDII connector cable plug from STAR to go deeper into your car's OBDII connector for a better connection.