Aircon switch blows fuse for airbag light

id101

id101

Zorg Addict
Joined
Dec 13, 2017
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59
Has anyone had this problem? If I switch on the aircon in my z3 3.0i it blows fuse 43 (7.5 amp) same happens if I leave the aircon switch on and I swap out the fuse and switch on ignition it blows.

Any thoughts?

Cheers in advance đź‘Ť
 
short circuit, probably humidity, or bad fuse box (wires deteriorate with time and heat - thank you BMW for tour biodegradable wires, the planet is safe now)
do you have any after market electrical in the car?
 
Zephyr said:
short circuit, probably humidity, or bad fuse box (wires deteriorate with time and heat - thank you BMW for tour biodegradable wires, the planet is safe now)
do you have any after market electrical in the car?
Click to expand...
There's a different stereo in there that's about it
 
IMG_2648.webp

the internet may be wrong, but fron what I see, in the 3.0 model fuse 43 is a 5A.
What does your chart under the fuse box cover say?
 
It maybe:
  • Shorted AC Compressor: A short circuit within the compressor coil can overload the circuit and blow the fuse.
  • Faulty Blower Motor: If the blower motor seizes or has internal damage, it can draw excessive current and blow the fuse.
 
The AC system works as a backup. So better check the motor for your electric auxiliary fan motor, it may be seized.
Or theres an issue at the two relays (a high speed and low speed) that control the whole system.
 
Interesting as I seem to remember the electric fan being on all the time but I don't think it is now
 
id101 said:
Cheers that's excellent, I won't understand it but i can always ask someone who does! Lol
Click to expand...
IMHO- BMW's circuit diagrams and presentation style for these are very difficult to understand and follow. I would love to see a more conventional diagram or diagrams. What I do is print the various pages that connect the circuit I am trying to trace or sketch out what I see so I can look for a fault.
 
Rudyrov said:
I followed that link above and didn't see a manual, so here is the one I have.
Click to expand...
The download button is at the end of the title...
 
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