1991 Euro 560SEL continues to be a joy to own.

Question: Right next to the fusebox, there's a small ancillary holder that takes two additional fuses. (I can't find this holder referenced in the service manual.) Anyone able to help me by identifying the circuits these two auxilliary fuses protect? [Photo attached]

Note that one of the two receptacles is empty. What (if anything) is on that circuit? And, if needed, what's the correctly rated fuse to insert?

Thanks for any advice here...

Attached Thumbnails

 

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Eric

1991 560SEL-Euro (214,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)

Most likely the blower motor, remove it with the key OFF & then see if the blower functions when you turn the key back on.

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possibly heated seats

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...that's not it. The car has the outboard 30A strip fuse protecting the blower circuit. (I nevertheless pulled the 25 Amp fuse from that external holder as advised, started engine, and blower motor still runs fine.) Mystery remains!

After my original posting, I did a more thorough search online and found a few others asking the same question about this apparently undocumented component in their vehicles. No definitive answers supplied to any of them either. Seems this same dual fuse holder gets used in multiple MB models for differing reasons. As noted previously, in my case ('91 Euro Edition 560SEL), only one of the holder's two receptacles is presently filled. Not sure if this is by design, or whether an additional fuse should be inserted. (Maybe it'll activate the gull wing door feature...)

I can obviously fiddle around until I figure this out by trial & error; but it would be really great if someone could offer up the definitive answer.

Always appreciate this board!

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Eric

1991 560SEL-Euro (214,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)

Nope... Not the heated seats. I tried them too with the fuse removed, and they worked fine. I'm thinking maybe the theft alarm... What's the easiest way to test that? (I can't recall it EVER sounding in this particular vehicle, hmmm...)

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Eric

1991 560SEL-Euro (214,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)

How about the power rear seat or rear seat heaters?

-J

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Thank you gentlemen!

Turns out that external fuse IS for the heated seats after all. I incorrectly responded to pwogaman's earlier post based on the fact that I saw the indicators on the seat warmer switch light-up. I didn't sit around long enough to see if the coils actually heated. Indeed, with the fuse removed, the indicator lights on the switch still work, but no heated seats. Reinstall the fuse, and fannies are again warm!

Armed with this info, I returned to the service manual to discover that the external fuse holder actually is correctly depicted in the seat warmer schematic (really helps when one knows what one is looking for!)

While the schematic shows that indeed there should only be a single fuse inserted in the dual module, it SHOULD be a 16 Amp fuse--NOT the 25 Amp one currently inserted in my car's receptacle. I'm making the switchover now to the correctly rated fuse.

Thanks again for helping me to so easily resolve this one. GREAT!

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Eric

1991 560SEL-Euro (214,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)