W203 C220D Starter Fuse randomly blows (Front SAM)
Bit the bullet and had a specialist run STAR diagnostics. Turns out I was right, multiple faults in the Front Signal Acquisitions Module (SAM), as well as a couple of other minor faults that aren't presenting any real issues. The wipers decided to play up the morning I took the car to the garage, not working at first then randomly deciding to work a few minutes later with no issue, which I later found out happened to Mercedes when they changed the ECU about 3 years ago. They thought nothing of it and returned the car to my friend, who personally never experienced the issue.
As you can hear when it doesn't blow the starter fuse (Fuse 52) it starts fairly strong, keeping in mind I've been trying to drain the battery and heat the starter motor to see if the fault will present more often (it doesn't). No loose wires and working with a scissor jack in cramped spaces isn't very enjoyable for me so removing the starter to inspect wasn't really an option I wanted to consider unless I had to. Luckily I don't, but unfortunately fixing this is going to be far more complicated than I'd hoped.
Options at this point are:
Main Dealer Replacement - about £700 supplied and fitted (quoted by local Mercedes Dealer).
Third Party Replacement - £300-400 estimated, depending on cost of unit (Local Specialist).
Repair the thing - Difficult, Can't find schematics, High chance of failure, Lots of prerequisite requirements, Time consuming, but essentially FREE or a few quids worth of minor components.
Obviously I'm leaning towards repairing the unit, so my next task is to get the thing out (as well as the ECU as I have a feeling Mercedes never really replaced it), inspect the wiring and connectors, and then attempt to disassemble the SAM and see if I can locate the fault. I'll try to upload another video in the next couple of weeks to update on the situation, and a video of what I find if/when I disassemble the SAM. Hopefully this helps someone in the future.
Видео W203 C220D Starter Fuse randomly blows (Front SAM) канала David
As you can hear when it doesn't blow the starter fuse (Fuse 52) it starts fairly strong, keeping in mind I've been trying to drain the battery and heat the starter motor to see if the fault will present more often (it doesn't). No loose wires and working with a scissor jack in cramped spaces isn't very enjoyable for me so removing the starter to inspect wasn't really an option I wanted to consider unless I had to. Luckily I don't, but unfortunately fixing this is going to be far more complicated than I'd hoped.
Options at this point are:
Main Dealer Replacement - about £700 supplied and fitted (quoted by local Mercedes Dealer).
Third Party Replacement - £300-400 estimated, depending on cost of unit (Local Specialist).
Repair the thing - Difficult, Can't find schematics, High chance of failure, Lots of prerequisite requirements, Time consuming, but essentially FREE or a few quids worth of minor components.
Obviously I'm leaning towards repairing the unit, so my next task is to get the thing out (as well as the ECU as I have a feeling Mercedes never really replaced it), inspect the wiring and connectors, and then attempt to disassemble the SAM and see if I can locate the fault. I'll try to upload another video in the next couple of weeks to update on the situation, and a video of what I find if/when I disassemble the SAM. Hopefully this helps someone in the future.
Видео W203 C220D Starter Fuse randomly blows (Front SAM) канала David
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