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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 02-13-2007, 02:29 PM   #1 (permalink)
Join Date: Mar 2006
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Horn problems

Hey, i have a 88 325iS and the horn stopped working a while ago, i think it may be due to wiring issue because it worked great when it did work, but i dont know where the wiring for the horn is. If you could tell me where to find it or if you have any other possibilities on the cause of the problem please let me know.

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Old 02-14-2007, 10:13 PM   #2 (permalink)
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Not much help but on my 87 325is
I had to resolder/shrink wrap the wires to the two horns under the front end. (they were previously cut)
replace fuse.
remove center cap with screw driver clean up wiring.
cleaned up all the wires in column, with electrical parts cleaner. This fixed my tun signal problem. I think the relays are under there.
Have to remove all the covers to get at it all,but goes back together pretty easy.
Nice to get all the old years of dust coffee dirt grime etc out.
shop fixed one sticky button with new spring ring thingy
I'm pretty sure its an M wheel to,like yours?
Once you find the wire colors,compare to the wiring diagrams in bently/haynes and look for those colored wires in the spagetti bowl of wires under the dash to see if someone spliced into them,also.

If you only had one horn working then the other one went out that could be it too.
run apair of wires from the battery or in our case the junction on the passenger side where those wanna be i and e cars put thier batteries LOL, to the horns to test them maybe. careful removing the connectors they get dirty oxydized and brittle,I sprayed mine down first before removing, electricalparts cleaner then wd40 .
Good luck.

Oh yeh I sprayed the contact cleaner behind the 3switches on the wheel too. and then some WD40 after.
This method resurected both frozen electric mirrors and thie switches too.LOL
Richard Fitz
'87 325is Delphin Metalic

Last edited by Rfitz25; 02-14-2007 at 10:36 PM.
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