ThePD

Dear MB Experts,

I am having a strage issue since this morning, I had a warning in the meter console for right turn signal not working but when I switched of my car, the left indicator stays on and also the right brake lights.. Any suggestions what went wrong and whats the problem.. HOw to have it resolved please advise. Thanks.

ThePD

Anyone please help

Domm

Unplug the battery and see what happens? I'm at a loss and I assume most people are as well, which is why no one is responding. Best advise: take it to the dealer or Indy

Glyn M Ruck

It's likely a rear SAM issue. For CANbus & SAM issues you really need to get the car onto a Star diagnostic machine. SAM might just need re programming.

ThePD

Thanks for you response Glyn..

Took the car to workshop and the guy says your Fuse box which is in the trunk part # 2045453901, is blown and you need to replace it..

Is it something to believe or he is trying to rip me off.

Glyn M Ruck

He is talking about the rear SAM - Signal Aquisition & Actuation Module. (includes fuses)

These things are expensive. It might be blown but it might also just be corrupted. First step is to re-program & initiate. If that fails then replace which also requires programming with Star.

omardaer

ThePD,

It seems I'm having the same problem. Can you give me an insight on how you resolved this issue?

hollysway

I don't think so,I check the tail light,the wire does't connect to the rear SAM,so I think it does't matter with rear SAM.

hollysway

I will try this tonight.I hope it works.

Glyn M Ruck

The brake light connects to the front SAM via fuse 21. The rest of the tail light cluster including flashers is controlled by the rear SAM.

hollysway

Are you check wire by yourself, or you have a circuit diagram ?

I don't see tail light cluster connect to the rear SAM directly.The wire and what you say confuse me.

Glyn M Ruck

Please note that anything that is labeled "electronic" on your fuse diagram is controlled by the front or rear SAM. The SAM is controlled over the CanBus which is a bi directional digital network that replaces miles of hard wiring. example. If you turn on your parking lights or headlights a signal is sent over the CanBus to the SAM to tell it to turn on your lights.

See the W203 Wiki for how a CanBus operates.

Glyn M Ruck

Here from Wiki.

You have no wiring diagram as you are used to because a Canbus carries multiple signals in multiple directions simultaneously if necessary.

http://static.ibsrv.net/mbworld/Can%...2010-28-02.pdf

hollysway

Thank you! I will read that information about Canbus.

w204_Generic

http://www.ebay.com/itm/321356100060

There you go, if all else fails.


That is $225 plus free shipping. Dealer price is $500+

hollysway

Do you have more detail about W204 rear SAM ? I will try repair the unit this weekend.

Glyn M Ruck

Sorry, No.

You really need a Star to work on the SAM. Sometimes it's just the software flash that has become corrupted.

hollysway

Thanks again.

I see the thread about "DIY: REAR SAM low cost repairing", and I'll try to reset rear SAM.If that not work,I'll find a used rear SAM or goto a Star like you said.

hollysway

About three weeks ago,my car definite crash.After locked the car,the rear light was always on.It must repair.I got to used market,changed rear sam,cost about $400,and the problem was gone.

When I have time,I will see the thread "DIY: REAR SAM low cost repairing" again, and I'll try to repair rear SAM.