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BMW E39 Air Supply Issue: Replaced Resistor, Checked Fuses, Blower Works, Climatronic Fault?

malina156 19077 11
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  • #1 16892377
    malina156
    Level 9  
    Posts: 14
    Rate: 14
    I will start all over again, so I replaced the resistor with the same one with identical numbers, it does not work. Fuses all ok, No. 8 this style behind the glove box even those in the glove box. The blower works. Is it possible that the climatronic breaks ???? Regeneration only works no airflow control works less or more.
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  • #2 16893172
    Dawidws442
    Level 9  
    Posts: 13
    Help: 1
    Rate: 4
    The airflow itself is there under the hood of such a so-called hedgehog, such a cube, see if there are any tarnished wires, etc., it is best to unplug the fan and connect the multimeter there and turn on the blower, it will not give 100% certainty that everything is ok, but if it gives voltage, there is a possibility of a fixed plug somewhere and the fan from the air supply needs a little electricity and loses voltage somewhere on the ankle
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  • #3 16894474
    malina156
    Level 9  
    Posts: 14
    Rate: 14
    if this resistor must have the same numbers as it was originally because I do not know if it makes sense to buy because I have but with other numbers. and if I touch the mass on the attached ankle, the blower is on the max. or maybe the climatronic has failed, how can you check the climatronic? ??? buddy, this resistor is inside, not under the hood, I'm talking about 39 sedan here
  • #4 16894610
    melas
    Level 31  
    Posts: 1552
    Help: 138
    Rate: 684
    If you touch this heat sink from the hedgehog to the ground, it's a fan? As it is, check this thin cable with an oscilloscope if it gets a signal from the climatronics.
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  • #5 16895575
    Dawidws442
    Level 9  
    Posts: 13
    Help: 1
    Rate: 4
    melas wrote:
    If you touch this heat sink from the hedgehog to the ground, it's a fan? As it is, check this thin cable with an oscilloscope if it gets a signal from the climatronics.

    with an oscilloscope, a strange method, a hedgehog has always touched the mass in this car, it is screwed with metal screws to the car's metal sheets, and what if it is a wire + a burned oscilloscope will it show? well, that's not what a universal multimeter is for, if you don't have one, buy the cheapest one for PLN 20, a one-time measurement should be able to check the continuity of the wires and the voltage on the hedgehog and behind it with the fan plugged in and turned on.


    Moderated By T5:


    3.1.11. Don't post messages that add nothing to the discussion. They are misleading, dangerous or do not solve the user's problem.

  • #6 16896173
    sebap
    Level 41  
    Posts: 7139
    Help: 538
    Rate: 1076
    Buy a hedgehog with the same number and don't fret.
    Look what words will underline you in the editor because he reads terrible words with such errors.
  • #7 16900717
    malina156
    Level 9  
    Posts: 14
    Rate: 14
    I bought the same hedgehog with the same numbers, it doesn't work either :shii: The fuses are ok all. I have no idea what devices are you writing about, so is it possible that the climatronic has fallen ???? I have not checked the cubes yet, but 99% is ok. :shii:

    Added after 3 [minutes]:

    Climatronic supports all other functions only with non-blowing force :shii:
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  • #8 16900929
    sebap
    Level 41  
    Posts: 7139
    Help: 538
    Rate: 1076
    Did you buy a poor replacement or something specific?
  • #9 16900935
    melas
    Level 31  
    Posts: 1552
    Help: 138
    Rate: 684
    Car for electrician. You have no idea and the layout is simple.
  • #10 16901396
    malina156
    Level 9  
    Posts: 14
    Rate: 14
    original replacement

    Added after 5 [minutes]:

    Maybe I have no idea but I will do it. Melas, then write what to do. I checked the fuses ok. The blower is ok. I have two hedgehogs with the same numbers, the original Valeo and it does not work tomorrow, I will have a third, then I will be sure that it is not a hedgehog.

    Added after 1 [minutes]:

    I already have a multimeter so I will measure tomorrow.
  • Helpful post
    #11 16901619
    melas
    Level 31  
    Posts: 1552
    Help: 138
    Rate: 684
    Write to me, or if you touch the hedgehog to the mass with this heat sink, the fan works full steam? On one thin cable you must have 12 volts, after turning the ignition on the other cable, check if it brightens when you adjust the climatronic. Check and let me know

    Added after 2 [minutes]:

    The schematics you look for on the BMW Wds are generally available
  • #12 16903067
    malina156
    Level 9  
    Posts: 14
    Rate: 14
    When I touch the mass, the fan is running at full power. Now check it with the same numbers.

    Added after 3 [hours] 47 [minutes]:

    so the climatronic remains on the thin wire there is no current at all. on the other two it is brown also not.
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Topic summary

✨ The discussion revolves around an air supply issue in a BMW E39, where the user has replaced the resistor and checked the fuses, but the blower still does not function properly. Despite the blower working when directly connected to ground, the climatronic system appears to be malfunctioning, as there is no voltage on the control wires. Suggestions include checking for damaged wires, using a multimeter to measure voltage, and ensuring the replacement resistor matches the original specifications. The user has confirmed the use of original Valeo parts but continues to experience issues, leading to speculation about a potential climatronic failure.
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FAQ

TL;DR: E39 blower-speed faults usually come from the FSR “hedgehog” control: verify 12 V on the thin control wire; “On one thin cable you must have 12 volts.” Check fuses and signal before blaming the climatronic. [Elektroda, melas, post #16901619]

Quick Facts

What is the E39 “hedgehog” and what does it control?

It’s the Final Stage Resistor (FSR) with a finned heatsink that modulates blower speed. The climatronic (IHKA) sends a control signal to the FSR, which then regulates power to the cabin fan. A grounded heatsink makes the blower run full speed. [Elektroda, melas, post #16894610]

How do I diagnose no airflow control when the blower still spins?

Do three checks. 1) Verify blower fuses (including No. 8). 2) Momentarily ground the hedgehog’s heatsink; full-speed means motor and power are good. 3) With ignition on, measure the thin wire for 12 V and variation while changing fan speed. [Elektroda, melas, post #16901619]

Does the FSR need identical part numbers on a BMW E39?

Yes. Owners advise buying a hedgehog with the same number to avoid incompatibilities. This ensures the control circuitry matches the IHKA signal and avoids erratic speeds or no response. “Buy a hedgehog with the same number and don’t fret.” [Elektroda, sebap, post #16896173]

Where is the hedgehog located on an E39 sedan?

It sits inside the cabin HVAC housing, not under the hood. Access is typically behind the glovebox/center area, depending on trim. Users in the thread clarify it’s inside for the E39 sedan. [Elektroda, malina156, post #16894474]

Could the climatronic (IHKA) be the cause if speed control doesn’t work?

Yes. If the thin control wire shows no 12 V or no change when adjusting the panel, the IHKA signal path or controller may be at fault. “Check this thin cable… if it gets a signal from the climatronics.” [Elektroda, melas, post #16901619]

What voltage should I see on the thin control wire?

Expect about 12 V with ignition on, then a changing signal as you adjust fan speed. Lack of 12 V indicates a control-side issue upstream of the FSR, such as IHKA output or wiring. [Elektroda, melas, post #16901619]

Which tool is best: oscilloscope or multimeter for this test?

Use a basic multimeter to verify voltage and continuity at the FSR connector and blower. A budget unit is sufficient for these checks, and safer than probing with an oscilloscope in tight spaces. [Elektroda, Dawidws442, post #16895575]

How can I confirm the blower motor itself isn’t dead?

Momentarily ground the hedgehog’s heatsink. If the fan runs at maximum, the motor and power feed are fine, and the issue is control-side. This is a quick, decisive test. [Elektroda, malina156, post #16903067]

What wiring issues should I watch for at the hedgehog connector?

Inspect for tarnished or heat-damaged wires and loose plugs. Poor contacts drop voltage and prevent proper fan control, even when the blower and FSR are good. Clean and tighten as needed. [Elektroda, Dawidws442, post #16893172]

I replaced the FSR twice and still no control. What next?

Stop swapping parts. Measure the thin wire at the FSR for ignition 12 V and signal change from IHKA. If absent, trace IHKA output and related fuses using WDS diagrams to find the break. [Elektroda, melas, post #16901619]

Is using an OEM brand like Valeo a guarantee of success?

No. One user tried an original Valeo with matching numbers and the issue persisted, pointing to wiring or IHKA signal. Part quality matters, but correct diagnosis matters more. [Elektroda, malina156, post #16901396]

What is BMW WDS, and why is it useful here?

BMW WDS is the official wiring diagram system. It shows the IHKA-to-FSR-to-blower path, connector pinouts, and fuse links, helping you find breaks quickly and avoid guesswork. [Elektroda, melas, post #16901619]

What do brown wires mean in this context?

Brown usually denotes ground in BMW wiring. If the brown ground paths show no continuity or no return, the blower will fail or behave erratically even with a new FSR. One case reported no current on brown wires. [Elektroda, malina156, post #16903067]

Can a failed fuse still let the fan run at full speed when grounded?

If grounding the heatsink triggers full speed, the high-current fuse and feed are intact. The remaining fault is the control signal or connector integrity at the FSR. Check the thin wire next. [Elektroda, malina156, post #16903067]

Quick How-To: How do I test the E39 blower control path fast?

  1. Check blower fuses, including Fuse 8 behind the glovebox.
  2. Ground the hedgehog heatsink; confirm full-speed blower.
  3. With ignition on, meter the thin wire for 12 V and response to fan changes. [Elektroda, melas, post #16901619]
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