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I own a 2008 S550. After accidentally jumping it with the key on, I'm experiencing no crank and no start. Both batteries have been replaced, the starter is functioning properly, but there's no communication from SAM. SAM, which is new from Mercedes-Benz, has power but isn't communicating with anything.
HELP!!!!! I’m thinking I need to get ecm reprogrammed?
This sounds like a classic case of frying the front SAM. Even a new one needs to be coded to the car. You need a professional with Mercedes-specific diagnostic software like STAR to properly code the new SAM to your vehicle. The ECM may be fine; the communication issue is almost certainly the uncoded SAM.
its outrageous a dealer can fit a new front SAM and give up!
I just updated this - found they call some in the boot (trunk) of early twin battery cars Pre-fuses
Prefuse Box in the Engine Bay – F32/3 - Year 2005 to 2008 - the bit beside the battery
Fuse Ampere Rating Designation
F1 400 Starter M1
F2 150/200 Not for engine 642: Alternator G2 / Valid for engine 642: Alternator G2
F3 150 -
F4 150 AAC with integrated control additional fan motor M4/7
F5 200 Valid for engine 642: PTC heater booster R22/3
F6 200 Front SAM control unit with Fuse Relay module N10/1
F7 40 ESP control unit N47/5
F8 25 ESP control unit N47/5
F9 20 Front SAM control unit with fuse and relay module N10/1
F10 7.5 Vehicle power supply control unit F82/1 (Rear)
Prefuse Box in the Boot – N82/1 - Year 2005 to 2008 - the box of tricks above the hidden rear battery
Fuse Ampere Rating Designation
F1 No fuse Front prefuse box (via on-board electrical network line pyrofuse)
F2 125 Heated windshield control unit
F3 80 Right instrument panel fuse box
F4 200 Rear SAM control unit with fuse and relay module N10/2
F5 100 Special vehicle multifunction control unit (SVMCU [MSS])
F6 150 Rear SAM control unit with fuse and relay module N10/2
F7 100 Front SAM control unit with fuse and relay module N10/1
F8 80 Instrument panel fuse box F1/7
F9 5 Front SAM control unit with fuse and relay module N10/1
F10 5 C216: Emergency call system control unit
Prefuse Box in the Engine Bay – F32/3 - Year 2008 Onwards (single battery vehicles)
Fuse Ampere Rating Designation
F2 400 Alternator G2
F3 150 Electrohydraulic Power Steering A91/1 or glow time out put stage N14/3
F4 No fuse Interior prefuse box F32/4
F5 100 AAC with integrated control additional fan motor M4/7
F6 150 Front SAM control unit with Fuse Relay module N10/1
F7 40 Not for ESP Control Unit N47/5, Valid for Regen Brake System N30/6
F8 25 Not for ESP Control Unit N47/5, Valid for Regen Brake System N30/6
F9 30 Front SAM control unit N10/1
F10 – Not used
I know that this sounds crazy, but I had the exact same symptoms. Fuel pump relay behind the rear seat storage compartment was the fault. I dealt with this random fault for months, replacing, starter, fuel pump, and filter, until it finally gave up. Swapping the relay completely fixed it. May be a cheap and quick experiment for you.
I know that this sounds crazy, but I had the exact same symptoms. Fuel pump relay behind the rear seat storage compartment was the fault. I dealt with this random fault for months, replacing, starter, fuel pump, and filter, until it finally gave up. Swapping the relay completely fixed it. May be a cheap and quick experiment for you.
"Fuel pump relay behind the rear seat storage compartment" do you mean Relay S on the Rear SAM ? which is accessed by folding down the rear centre armrest and popping off a cheap nasty cover, where upon you see the SRB with fuses and relays clipped on top on the Rear SAM
I got it started feel like a proud dad lol it was a split wire under the passenger seat and the Sam Mercedes put in wasn’t working so I put a use Sam in and it started right up.
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