wireless

Hi all,

I've got a strange one that just started showing up. The drivers light parking light is staying on after the car is turned off. Went back to the car an hour later and only the drivers side parking light is on. I connected it to the diagnostic tool I have and when I look at all off the options to do two-way communication I only have these.

Right low beam
Left main beam
Left front side lamp and parking lamp
left from turn signal lamp
Left foglamp

I swapped out light bulbs to see if it was a bulb issues and both lights test correctly. Now my question is, would this be indicative of a failing (or failed) drivers side SAM? I'm not getting any codes that there's an issue with the SAM.

Thoughts?

J.D.

A1EK

Silly question, but you sure you have not just turned the parking lights on at the control knob?

11 o'clock position will leave on right side front and rear lights when parked, 10 o'clock for the left side.

wireless

Triple checked everything. I'm really leaning towards a SAM issue. The only thing my scanner sees from the right side is the low beam light. I read a few other posts online describing some odd behaviors. Everyone post I read had a slightly different issue.

Anyone know the part number of a drivers side SAM? I blew out my VM that had WIS installed.

g0rsq

Are you looking at data from the correct SAM?

There are two SAM's that control the front lights. The lights are crossed between SAM's, so Left SAM controls some light on Left side, and some Lights on right side, and the Right SAM likewise!

However it looks like driverside SAM does control the parking/Standing light on Left hand side.

First question to ask when having issues with lights is have the been changed for LED. Often cause issues.

With good diagnostics you should be able to see the status of the light.

wireless

Thanks for this. I had been under the impression that the drivers side SAM controlled only both the left and right sides. I was able to validate the passenger side SAM is working correctly. When I do an active test on the drivers side with my diag tool i'm unable to turn it off. I should be able to override whatever the switch is doing and it just stays on. Also, every time I tried to change screens it would lose connection or say it can't find the SAM. This doesn't happen on any other SAM. However, I did see an odd stored code saying something about the light switch. I wish I would have taken a pic of it before I cleared out the code. I was hoping it would come up again but it didn't.

g0rsq

Is the output status always ON?

If this is the case then it is likely something else keeping it ON.

What diagnosis tool are you using?
Not sure they can all force outputs OFF if it is switched ON internally.

Have you checked the status of the light switch You should be able to read it in the SAM. If not try disconnecting the light switch and check again the output with your diagnostics.I dont think the light switch is CANBUS, but it will use some comunication, maybe just binary signal.

wireless

Good one. Didn't think about checking this. I'll give it a shot and try it this evening. It's like a bazillion degrees outside I'm using an autel MaxiDas DS808K, FWIW.

wireless

Really starting to look like a SAM issue. I plugged it up to my Autel diag tool and I can get confirmation from the switch when I turn it to the parking lights. It'll tell me that the switch is on (and of course the light is on too). But when I switch it off, the scanner tells me that it's off, but the light still stays on.

I think that's my smoking gun.

wireless

Anyone know the relay that controls the parking light?

wireless

And the location? I must be looking at the wrong stuff because nothing seems to be telling me which relay it is.

Frederick NL

Sorry if I'm wrong but I don't think you answered someone's question if someone put a led bulb in there.

g0rsq

There is no relay for the parking light. It is controlled by a solid state device inside the SAM, kind of like a transistor.

They can fail open circuit, or short circuit (so ON all the time, or OFF all the time.

However they normally blow OFF all the time.

Yes looks like the SAM is faulty, so replace with another one.

A used one (with identical part number) may work fine, but really you need to use STAR/SDS system to transfer over the settings inside. All depends if options on doner car match options on your car.

wireless

There’s no led bulb.

wireless

Ordered the same part number. Fingers crossed. We'll see how it goes.

Thanks to everyone that offered their thoughts. I really appreciate it. I'll keep everyone posted.

Rad Pro

Just a comment regarding this issue. - I have a 2004 SL500 with only 54K miles on it. I had issues with the Battery Control Module and dreaded red light icon . The module did its job however it was not communicating with the Can Bus correctly. I removed the module out of the vehicle and opened it. I found corrosion on the board where the center connector is located. I removed the corrosion using a toothpick, alcohol and contact cleaner. I found minute corrosion on other parts of the board and clean that also. I reinstalled the module and corrected the false Can Bus error . I then decided to check out other modules and found small amount corrosions on the rear SAM board , front right and front left SAM modules connectors. The right front SAM was the most difficult to remove and then reinstalled. All compartments inside the vehicle were completely dry no evidence of water intrusion. i attribute the corrosions to humidity. I now have " no malfunctions" display on the dashboard. If you follow this post you will have your work cut out for you. Good Luck

Dr. Plastic

It's not an issue. It is what is referred to the German parking lights and all cars in Germany are required to have them. I think you can disable it in the menus. They stay lit at half voltage. Many cars in country park on the street or on a curb in skinny streets and the lights help keep other cars from hitting you when navigating small side streets.

https://www.autotrader.com/oversteer...ide-car-269684

Frederick NL

Parking lights in Europe, sure, but of course you switch them on manually when you want to use them. And off, obviously.

raez77

Can you share me diagram of right and left side headlight unit of Mercedes w220 2000 model plz

raez77

can you share me same wiring diagram for Mercedes w220 2000 model s320