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Thread: Blower motor issue

  1. #1
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
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    14,723

    Default Blower motor issue

    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?
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  2. #2
    Join Date
    May 2004
    Location
    Japan
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    9,137

    Default

    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.

  3. #3
    Join Date
    Dec 2003
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    Eastern Tennessee USi
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    Default

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

    What and where?
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  4. #4
    Join Date
    May 2004
    Location
    Japan
    Posts
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    Default

    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

  5. #5
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
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    Default

    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

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