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windgat 01-07-2013 04:44 AM

bmw 540i e34 horn and light problem
Good day my fellow bmw owners.i'm stuck and need help with my 540i
i just bought the car but it seems that someone changed the lights so when the switch is on parks in switch on mane beams as well and would like to know where to check for a relay or something.i checked the wires and fuses and at the back of switch and cant find a problem.and with the horn it is completely power to steering collum or fuse.please help

windgat 01-07-2013 10:43 AM

is there anyway to bypass all of that.cause i see that the airbag light stays on

paperplane94 01-07-2013 11:46 AM

Make sure all the fuses are OK.

Also I have a theory about your problem, but can you post a picture of your fusebox here?

windgat 01-08-2013 09:01 AM

2 Attachment(s)
i found the relay but theres no power.when you remove the horn fuse and switch on the egnition and press the horn then you can here the relay on my bmw 525i e34 its the small black one at the bottom

paperplane94 01-08-2013 07:54 PM

Wait, so when you switch on the parking lights(1 click up), the Main beams also come on....

Sounds like a problem with the LKM. The LKM is the biggest black box in the bottom of your first picture, it pulls out. MAybe one of the relays in your LKM is stuck on.
repairing the LKM here:

The horn problem is something else that I don't know, all I can say is check for power at the connector of the horn, which means removing stuff to get to the horn.

ALSO your #19 fuse slot looks burnt out.

ONE MORE THING. What Model Year is your 540i?

windgat 01-09-2013 01:32 AM

1995 e34 and my 525i is 1994

paperplane94 01-09-2013 02:11 AM

OK, here are the ETM books so that you can trace the light and horn circuit:
If you need help reading it, message here again.

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