Need help... Ac and horn fuse keeps blowing

[seandhillon]

Hello everyone...

I have 91 E32 735IL....Vin#DC27666.... i got couple of problems...

My Ac and Horn fuse#9 keep blowing some reason any idea? as soon as i turn on the ac the fuse pops
Also i just recently replaced my steering wheel to Nardi non airbag wheel.. i disconnected the battery before installation after i got done putting it together connected the battery... Now i have no power to my radio ? i did unplug the airbag/SRS plug..


any help would be appreciated.... Thanks

[shogun]

fuse #9 is for horn, IHKA, auxiliary fan, cellular phone (optional extra) http://shark.armchair.mb.ca/~dave/BMW/e32/e32_91.pdf
I would first check the aux fan, maybe it is blocked by the magnets inside the motor which get lose and then there is too much amps, on my buddies 750 even the wire from aux fan to fuse box had melted. Turn the aux fan by hand if it runs smooth.
If that is o.k., disconnect the 4 plugs which go into the IHKA control module one after the other, on each side there are 2 plugs, the IHKA control module is behind center console, when you remove the cover on the side of the center console, you have access, only 1 screw each side.
So with this method you can find out easier the bad part, each pin description, IHKA pinout
white connector X610 'A'
1-4 stepper motor fond area
5 heater sword
6 aux fan
7 rear window heater relais
8 climate control relais
10 NC
11 NC
12+F20 (30)
13+F20 (30)
14 - 17 stepper motors for air distribution (recirculation)
18 light switch LED
19 light switch LED
20 TXD
21 water valve left side
22 aux water pump relais K8
23 water valve right side
24 front window heating relais K8
25+F20 (30)
26+F20 (30)

Blue connector X613 "C"

Pins are in such way
13 up to 1
26 to 14

1= ground
2=ground
3= NC
4=temp feeler driver side
5= potentiometer blower motor
6= temp feeler in engine room
7=outer temo feeler
8= potentiometer temperatur driver side
9=NC
10+,11+, for stepper motors
12+F21 (15)
13+ F21 (15)
14= ground
15=ground
16= potentiometer+ feeler ground
17= potentiometer flappers
18 temp feeler left
19 starter (50)
20=potentiometer+feed
21 temp feeler inside
22 temp feeler reight side
23+ for stepper motors
24+for stepper motors
25+26 = F21 (15)
26+ F21 (15)


green X611 „B“
1 to pin 14,15,16
2,3,4,5 mixing flap motor left
6,7,8,9 fresh air stepper motor outside
10 NC
11 NC
12 NC
13 NC
14, 15,16 with pin 1 legroom stepper motor left
17, 18, 19, 20 defrost flap stepper motor
21, 22, 23 fresh air stepper motor left
25 NC
26 NC

yellow connector 614 „D“

1,2,3,4 legroom stepper motor right
5 MPX button
6 MPX button left
7 MPX defrost
8 MPX button right
9 speed signal
10 RDX
11 button rear window defogger/defroster
12 MPX button recirculation
13 MPX button aircon
14, 15, 16, 17 fresh air stepper motor right
18, 19, 20, 21 mixing flap stepper motor right
22 NC
23 NC
24 NC
25 NC
26 NC

The connectors are:
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14

See the connectors, they are marked with small numbers outside.
the SWORD has a 5 pin connector
Pin 1 connector for the potentiometer for speed regulation at the control panel.
Pin 2 power supply
Pin 3: the relay get's contact when the blower fan potentiometer is adjusted, 12 volts come on.
Pin 4 is ground
Pin 5 the cable/wire from the blower fan.

[SergeBMW]

I had the same issue, it was the AUX fan that was jammed up and never really turned freely. It can also have an internal short. Good info above if its not the AUX fan.

[seandhillon]

Thanks shogan... i will look into it