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  #1  
Old 07-29-2006, 05:36 PM
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Question W124 400E - What is this part?

Hi all, while trying to fix a problem with the aux fans with my car I ran into this part located just behind the brake booster (the middle black box in the picture), I need to know what it goes to. Inside it resides a white fuse, it was blown and there is power going to it. I don't want to try putting a new fuse in until I find out what it does. I have not noticed any effect from the fuse being blown, and for all I know it could have been like this for years. This car has fuses spread everywhere throughout that are not labeled which makes me wonder how many more might be blown that I don't know about.



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Old 07-29-2006, 09:06 PM
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I'd like to double-check my info on my Mercedes wiring diagram disc, but can't get it to work, BUT I think it's for the aux fans. If you look on the fuse list, I think it is listed there, but instead of a fuse number it says something like "Aux Fuse Box" or sumptin' like that. If no one knows for sure, hopefullt I'll get a current version of Adobe Acrobat installed and then can check it out.
Gilly
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Old 07-31-2006, 12:18 AM
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I tried to put in a new fuse with the ignition off and it blew instantly. There's always power going to it so I'm thinking it goes to something else besides the aux fans. I tried to follow the wire but it goes under the master cylinder away from view. It looks like I'm going to need to look at a wiring diagram as you suggested Gilly. If you end up getting your Adobe Acrobat working hopefully you can post the diagram.
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Old 07-31-2006, 06:33 PM
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I have the acrobat on now and will try to figure it out. I always have a problem trying to post anything here, but hopefully my description will suffice. I know just enough about computers to get myself into trouble.
Gilly
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Old 07-31-2006, 07:24 PM
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Ohhhh kay. Clear as mud, this is a tricky one. THINK I have it figured out though. Fairly sure the fuse holder is F22/1, it's used for the seat heaters. If I am correct it should be a 25 amp fuse, a white one is only 8 amps. You got seat heaters, and do they work? Acid test is this: Should have 2 wires (in and out) one is red, other is red with a white stripe. I see these colors in the pic you posted but hard to tell what combinations they are. I just see both red and white. I also see the number 5 label on one of the wires, unsure the significance of that, usually I would associate it with fuse #5, but I see no connection to F22/1 and fuse 5. If this all seems to be correct-sounding, I'd try popping in a 25 amp fuse. If you have spare fuses I think a 25 amp is blue.
Gilly
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Old 07-31-2006, 07:46 PM
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Well, unfortunately my car does not have seat heaters, I wonder if the wiring was put in anyhow and they just left the element out. I've tried the white, red, and blue color fuses and they blow immediately. There are only two wires as you mentioned, one red, the other red and white so that's at least good.

I figure that it's been like this since I've had the car, everything seems to work fine on the car except the low speed aux fan setting but I don't think that this has to due with it.

Do you think you can email me the pdf of the wiring diagram?
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Old 07-31-2006, 07:52 PM
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No, it goes on for pages and pages.
For the heck of it, pull fuse 5 and see if the power goes away from this aux holder, cuz that 5 on there should mean something. Sometimes they piggyback fuses for you are using the amp rating of this fuse and fuse 5. What is the function of fuse 5? You don't see anything on the fuse list for an aux fuse holder? Any label on the other wire (the one that doesn't have the 5 on it)? Anthing under the cover over this fuse? This has just a space for 1 fuse right?
Gilly
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Old 07-31-2006, 08:10 PM
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http://mb.braingears.com/124_DISC1/Program/etm_my86-92.htm
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Old 07-31-2006, 08:11 PM
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Alright, just tried what you suggested, took out the #5 fuse in the fusebox which went the the guages, cruise control, etc. and there was still power to the outside fuse.

On the fuse box indicator card it says there are four fuses outside of the fuse box, they're the blower motor, seat heater, telephone, and aux fan. I know that it's not the blower motor since its mounted on the shock tower and takes and 30 amp metal fuse.

Next the fuse that we're dicussing, directly right of it in the picture is another 30 amp fuse just like the blower motor.

In the small box of the fuse that we're discussing is space for two fuses but the wiring only goes to the one fuse, the other is just extra.

It seems since there are only four fuses outside the fuse box the process of elimination should tell us which fuse it might be, we know it's not the blower motor for sure.
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Old 07-31-2006, 10:21 PM
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Checked out the possiblity of the fuse being for the phone. They only show the red and white wire coming from the aux fusebox F22/2 (instead of /1), and that one is an 8 amp white fuse. They don't show what the other wire color should be. You didn't mention what the 2 wire colors are, I just know there is some red and white going on, not specifically what each of them are.
Will try to find more info on F22/2.
Gilly
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Old 07-31-2006, 10:28 PM
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K for F22/2, they would both be red with white stripe and the power would be coming from X4, which is under the dash above the parking brake, just a 2 pole junction block. Wire would end up back in the trunk. You have the original phone stuff in the car or not/never?
Gilly
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Old 07-31-2006, 11:47 PM
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I took a look at the link Arthur Dalton posted, which is a link to an online version of the MB Shop CD. Sadly my internet is very slow where I'm currently staying so it's difficult to view the pdf file since it's 73 megs.

My car has never has a cell phone wired to it.

From what you just posted it a seems as if the mystery box might contain both the aux fan fuse and the cell phone fuse. I took a look at wiring diagrams for the cell phone and the aux fans and they both seem to share the F22/2 box and the F1 box which has a 16 amp fuse relay.

Upon further looking under the hood I think I may have located all of the four fuses outside the fusebox. As already stated the blower motor fuse is located on the shock tower and is a 30 amp fuse. Located to the right in the picture is a 25 amp fuse which I think is for the heated seats. Not in the picture but just below it there is a 15 amp fuse that is of the newer plastic Japanese style, maybe the aux fan. And finally to our box it might be either the aux fan fuse or the cell phone fuse. Since I found it with a white 8 amp fuse in it, it would seem as if it would be for the cell phone, the wires coming out of that box are red and red/white.

This doesn't really seem to make any sense to me but I'm thinking that the fuse we're trying to locate might be to the cell phone, a while ago I had some weird problem behind the stereo where a wire burnt and was blowing the stereo/windows fuse in the fuse box, it was hot even with the ignition off. Maybe the cell phone wiring is screwed up and this is it.

I have no clue why there would be fuses in the car for both the cell phone and the seat heaters but maybe all the wiring is put in anyway and they just leave out the actual option itself, seems that way.
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Old 08-13-2006, 03:39 PM
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Well, I think this one is solved, I got my aux fans to work. Whatever that other fuse is that keeps blowing will just be a mystery forever.

Thanks for the help Gilly.

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