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Posted

Checking the fuses in my under-bonnet fuse box, I was checking the maxi fuses fitted to my car and comparing it against a photo obtained from the web I noticed differences. One of the differences might have been me putting a fuse back in the wrong place.

 

From the web MF1 is 50A, MF2 is 50A, MF3 is empty, MF4 and MF5 are 80A, MF6 is 50A, MF7 is 30A and MF8 is 40A.

I might have put the 50A fuse into MF3 instead of MF2, but my car doesn't have MF6 (50A)

 

Can anyone tell me what these fuses do (I believe MF8 fuses the suspension pump), but what about the rest?

 

post-6017-0-08575700-1448290697_thumb.jpg

Posted

The French RTA manual for the 2001 to 2004 C5 lists the maxi fuses as 

MF1 and 2 50 amp

MF3 not listed (in your picture there does not appear to be any contacts in the fuse slot)

MF4, 5 and 6 as 80 amp

MF7 as 30 amp

MF8 as 40 amp.

 

Translated they are listed as

MF1 air con blower

MF2 abs

MF4 BSI

MF5 BSI

MF6 think this is for the glove box F36-40 fuses permanent live (G fuses on later models)

MF7 contactuer antivol ?

MF8 suspension pump

Posted

After writing, I found some of the answers in the Haynes manual (if you can believe what it says) and it gives -

MF1 going to relays controlling fans (could be cooling as well as aircon) and probably other functions not immediately visible.

MF4 and MF5 as you say, goes to BSI and controls many items.

MF7 goes to ignition switch

MF8 goes to suspension pump (also mentioned in another forum posting)

 

Putting MF2 fuse into slot MF3 gave many weird error messages and effects such as suspension wouldn't go to lowest nor highest positions and got message that all the tyre pressure sensors were missing, the ESP was turned off as well as failing plus ABS and Braking fault. So as well as ABS, it apparently has effects elsewhere not listed.

 

In my fuse box, you are right, MF3 is probably not used - there is in fact a contact in the upper slot as shown in the image (but not visible in the image), but nothing in the lower slot.

 

MF6 is 50A as shown in the image and also installed in my fusebox.

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