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Old 09-11-2012, 08:02 PM   #51
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I had the same trouble with my tail and marking lights when I wired in my towed car. I was looking for a blown fuse, I could not found. I took my Solera to MB dealer, they have told me, there is now fuse for the Tail light, it is controlled by a SAM computer. The trouble he found is the lights were over loaded and the SAM shot down the tail and marking lights. He then ran a separate wire to SAM for the tail lights and it has fixed the problem.
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Old 09-11-2012, 11:43 PM   #52
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Peter..

Sounds exactly like my problem. I did have a frayed running light wire on the trailer. I t might have shorted out.

I thought about examining the controller board but realized it looks like is fed from the 12 volt chassis battery.

what all did you disconnect before removing the controller board assembly from the utility compartment?
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Old 09-11-2012, 11:46 PM   #53
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Quote:
Originally Posted by emilizik View Post
I had the same trouble with my tail and marking lights when I wired in my towed car. I was looking for a blown fuse, I could not found. I took my Solera to MB dealer, they have told me, there is now fuse for the Tail light, it is controlled by a SAM computer. The trouble he found is the lights were over loaded and the SAM shot down the tail and marking lights. He then ran a separate wire to SAM for the tail lights and it has fixed the problem.
Who or what is SAM?
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Old 09-12-2012, 12:31 AM   #54
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Removing my controller for inspection & repair:
There were 3 mounting screws board to back wall, top right, & 2 bottom & 1 tie wrap on the wire bundle screwed down. After removing the screws, I had to chip away at the foam in & around the wire entry hole to get some working room.
On the board the battery power goes to the 2 lugs, top left is ground w/4 spade lugs & 1 bottom left 12v+ disconnect & tape the 12v+, it's hot.
Unplug the three molex plugs & you have the board out.
The front & back are screwed on at the corners, but the front aluminum plate has 4 pop rivits attaching plate to 2 of the large capacitors. I drilled the pop rivits out & then inspected the board. There was a slight discoloration at one of the relays but until I put external power on the lugs and into the "park in" the relay was silent. I tested the other, which was left turn & it clicked & I had voltage out on the bottom left 3 pin molex output to Solera lights.
After removing the old & soldering in the new relay, I tested again with power on the lugs & 12v+ to the top molex "Park In" The relay clicked & I got 12v+ out on the running lights out pin bottom left.
You need the wiring diagram that is on this thread to identify the pins and wire colors.
See my post from earlier today, American Technology Components will repair it for you or they sell a replacement board. Nice & helpful to me, you can contact them at www.atccomp.com
Hope this helps. Peter
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Old 09-12-2012, 11:12 AM   #55
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SAM is the Merecedes Benz control module that sends electrical signals to where they need to go. It is located behind fuse block in driver side kick panel.
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Old 09-14-2012, 06:32 PM   #56
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The tail lights and the marking lights, I believe it was the brown wire has separately relayed back to the SAM's control mo dual, located in the fuse Box above your left foot. When The Sam detected overload, it shots down. I hope I answered your question.
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Old 10-05-2013, 09:32 PM   #57
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Just bumping this thread back to the top
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