BMW E34 Blower motor issue

[632 Regal]

Went to take the lil girl to school this morning and no blower (not even on high). Was a cold ride. Thinking about all the possibilities and was stuck in traffic on the way back. All a sudden it started blowing while on speed #2 and also worked on all speed settings. Nothing triggered it like a bump or jolt, just sitting still idling in park. None of the controls worked either such as AC, rear defrost or re-circ and neither did the button lights. I am guessing a bad connection or ground. Where do I start troubleshooting this?

[shogun]

Might be a contact problem. Had a similar problem with my aux fan, turned out that some contacts were oxidized, used contact spray on all connections including the spades of the relays and it worked again.
Pull the control module and check the connectors, spray with contact cleaner/enhancer.

[632 Regal]

[QUOTE=shogun;349993
Pull the control module and check the connectors[/QUOTE]

What and where?

[shogun]

IHKA control panel in dash, backside has connectors
IHKA control modules behind dash next to the heater sword, 2 connectors on each side of the center console, and the sword connector, details pinout based on my E32, but probably same on your car if it is IHKA

white connector X610 'A'
1-4 stepper motor fond area
5 heater sword
6 aux fan
7 rear window heater relays
8 climate control relays
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 relays K8
23 water valve right side
24 front window heating relays 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 temperature 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 right 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.

On my website below there are pics how to resolder the IHKA control module

[632 Regal]

http://www.bimmernut.com/forum/showthread.php/44986-540i-Blower-Resistor

[632 Regal]

The issue reared it's ugly head again today. Swapped relay #4 in the front distribution box with donar car. Issue resolved. Swapped back to make sure and the relay was the problem. Just for fun I brought the bad relay inside for a while to warm up and it does work again. It will reside in the doner vehicle.

[shogun]

maybe you can re-solder it, open it up and check for cold solderings

[632 Regal]

maybe you can re-solder it, open it up and check for cold solderings

Replaced with doner relay, done deal.

Everything I researched was the resistor pack/sword and the issue was a relay never spoken about is my point.

[genphreak]

Any larger relay is a suspect for problems at 20 years in any beast ;-)

Even an aging garage queen, which she certainly isn't