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That was my thought as well. He said that the code was signal lost to the sam which led him to the prefuse to check those and apparently there is a fuse out in there. I would MUCH rather it be the prefuse than the sam but it is what it is I guess
With a surge strong enough to blow a prefuse, then for sure it will damage a SAM before the prefuse blows, the SAM units are very delicate units and act as a nerve center to take in and send out signals, in this case all the signals are going haywire which points directly at a SAM unit.
These are quite expensive units so the Tech needs to be sure it is at fault and hence his doubt.
Thats what he said too. I can get a complete new SAM from Mercedes here for $510USD. I dont understand the german cars at all. I would think that if the unit were bad then fuses would show no pwr to them but that's not the case with this thing. All the fuses show up as fine when tested making one think all is ok but apparently not.
Said he did a continuity check in the prefuse box to find something out. Just ready to be done with this car.
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