WaveyKat

So Lately when it Rains or even when i go thru the car Wash i get this Error search and didnt find anything on this site.

Thought it was the Brake Stop Lamp Switch but its not!

found something on mymbonline about someone saying the REAR SAM Might have a moisture problem.



Have anyone had the Error Before?

phister

Check the rear SAM or tailight harness. Sounds like water is leaking somewhere and moisting up.

FrankW

Hey mike,

Don't u have the s-class style lights ? Make sure they are not leaking because sometimes those seals will break down aging

WaveyKat

yea i do have those S-Class Style Light i will Remove them and check it out tomrrow and apply some Clear sealer around the egdes and will also remove the truck liner and take a look at the wire harness there too..

thanks.

Frank how did you convert to the 05+ tail lights on your 02?

MW_ATL

Oh yes, have had this happen on the Coupe. See if the contacts, both on the bulb and the bulb carrier have oxidized. Often cleaning them with a pencil eraser will help, for a while. For a long time I gave the car and annual "bulb sacrifice."

I think the moisture/humidity causes the resistance to go up and the system thinks the bulb is out. Before I started the bulb sacrifice, ours would act up almost every day that was rainy+cool.

WaveyKat

ok guess i will be checking each bulb too
:-)

thanks

FrankW

I had a write up on the 05+ tail light. I spliced couple wires and used the new connector.

WaveyKat

so i checked all the bulbs and connections no sign of water/rust. also removed the "REAR SAM/FUSE BOX" no sign of Water leaks nothing everything looks fine..
dont know where else to look smh..

baekim22

got the same thing error on my 2003 CL500 which i just bought like 4 days ago and then it decides to rain in san diego and after something got wet or possibly wet i saw this same exact error. I go into the trunk no fuse box or SAM (thanks to waveykat i just learned what a SAM, since this is my first mercedes lol) All i see are the 2 rear tail lights entrances through the carpeting. i opened them up and the plugs there are just EXPOSED poorly done. but of course i saw no condensation. Oh yea, the sign went away after everything dried off. Also when that error comes up when i first start the car the ABC and suspension up lights just flash for a bit. but that also disappears when the STOP LIGHT sign disappears. any thoughts and anyone know where the rear sam is for a 2003 cl500

WaveyKat

When The Stop Light Error Comes on All Three Brake lights Stays on constantly untill the error goes away.

@baekim: if you get the Fuse Chart Layout for you Model it should show the Rear Fusebox location

baekim22

Thanks waveykat. It always gives that error in the morning when I first drive the car. and then goes away all day until the next morning. I think it's a problem with the rain gutters on the trunk my friend. Yesterday I noticed a little bit of water leaking through the sides when I was getting my window tinted. Going to check the rear tail light connections tomorrow. After that I'm gonna buy some silicone seal and just seal off the rain channels on the sides of the trunk.

WaveyKat

hmm sounds like a good idea using the Sealer.. take some pictures

Also Check your Third Brake Lamp for Leaks i will be removing mines this weekend

WaveyKat

so i scan my car with the DAS Star and this what i think the problem is.. now All my Three Brake Lights stays on for good :-(







any help will be great

baekim22

CONFIRMED waveykat...pics to come soon. The leak in the tail light portion is confirmed. As suspected leaks right on to the back connection area of tail light and worse if it doesn't get the tail light can leak to the amp, pse and the spare tire area. Horrible

WaveyKat

so i was checking out my repair Manaul and its states:
Exterior Lights and/or Stop light swicthes on by itself: Causes: Water ingress into the module box engine compartment can lead to malfunctions in the signal acquistions and control module Front Sam N10/1..

Edit: see attached

baekim22

https://mbworld.org/forums/cl-class-...any-ideas.html

check out pics and my explanation from this post.

baekim22

were u able to fix my friend?

AdidasC230

that sucks, some one said a rear sam is like 290 at a dealer if u need it and a bit of star programming to fix

LILBENZ230

Looks like he owns the STAR system so no need to use a dealer.

WaveyKat

Well over the weekend i took all the Carpet out from the trunk, i also removed the taillights and the REAR SAM. check and looked for Water leaks Nothing was found.. i also took apart the Front SAM no water there either..but just to be safe i used Clear Silcone Sealer around the Tailights and there ever i think water can come thru. put everything back together.. The Repair Manual Said Try Resetting the Rear SAM.. To do so you have to Disconnect the Negative Terminal On the Battery and wait 15 mins. after that i wash the car didnt get any error.. it rained this morning and so far still no Error but i dont want to speak to soon. but so far everything seems good.

yes i own a Star DAS :-) and the W203 Repair Manual..

baekim22

Man I should reset my SAM too. So you just disconnect for like 15 min?

WaveyKat

yep see post #15 with the Attached PDF File

WaveyKat

ok so last week tuesday and wednesday it rained alot and the Error Came back.. :-( so on saturday i took the Front SAM/FUSE box out completely removing all fuse and wires. and i found water corrosion around 3 fuses and 1 wire from underneath the SAM.. Luckily i had a 2005 Front SAM from 2 years ago. :-) i switch out the SAM and also added the water Cover over the SAM/FUSE Box that comes with the 2002+ C-Classes.. so far everything working great.. i went thru the car wash no error yet (knock on wood).. it supose to rain tuesday let see what happens then.. i will report back.

baekim22

any word back? the dealer fixed mine last week and then they called after further testing i think after the rain today the error came back so it might be a minute before i get it back again. We'll see what they say and come back with

baekim22

got a call from the dealers. the stop lamp error is gone, it hasn't come back. BUT all 3 of my brake lights are flickering on my cl500. anyone dealt with that before?