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  #11  
Old 10-19-2013, 04:45 PM
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I had a similar problem a year ago:

BMW X5 FAN WON’T STOP AFTER SHUTTING OFF. PROBLEM SOLVED.
December 4th, 2011 Mike
Are you sitting in your BMW X5 with the keys out of the ignition and your interior heating/cooling fan is still running? Are you Googling “BMW X5 FAN WON’T STOP” trying to find a solution so that your battery does not die while you are at work for the day?



My first thought was to pull the fuse for the fan except that the factory owners manual does not have any information on which fuses do what.
My second thought was to disconnect the battery, but the battery is in the rear buried below the spare tire and a number of large tight bolts and the factory included tool kit does not have the proper sized wrenches.
Third thought? Call the dealership. They told me over the phone there was no fuze to pull that would make the fan stop but they could pick up the car later in the afternoon and look at it. My BMW is out of warranty so I knew this would be a $500 + Solution.
Fourth thought? Get on line on my smart phone and Google the answer. Google told me it was most likely a bad Final Stage Unit and by removing a panel near the passenger footwell I could disconnect the unit which would turn off the fan.
Google was correct. Luckily I had a leatherman tool on hand with a phillips head screwdriver. Two screws removed and I had access to the connector plug to disconnect the Final Stage Unit. After unplugging this connection the fan stopped.

Later that evening I did a little more research on line and found out this is a fairly common problem with the BMW X5. A quick trip to Ebay and I purchased a replacement for just under $100.00 There were replacements as low as $39.00 but they were not OEM.

Replacing the BMW X5 Final Stage Unit took less than 15 minutes.
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  #12  
Old 10-19-2013, 05:05 PM
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thanks 03-e53 however in my situation its not the heating/cooling fans that wont stop its a fan that is sitting behind the cliemate control unit that I cant see but hear.
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  #13  
Old 10-19-2013, 09:32 PM
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Wake/Sleep Modes & the P-bus, K-bus, & GM

Quote:
Originally Posted by Grantsmith82 View Post
thanks 03-e53 however in my situation its not the heating/cooling fans that wont stop its a fan that is sitting behind the cliemate control unit that I cant see but hear.
Sounds like you're suffering from the same condition as many new owners that sit in the car after shutting down and then get confuzzled by the sounds and lights still illuminated.

There's a small fan inside the IHKA (AC/heat control panel) that draws air from inside the cabin across a thermistor...this is how the IHKA regulates the air temp you've selected.

This little fan in the IHKA control panel... as well as windows and door actuators (and Nav CPU) all stay AWAKE for 16 minutes after shutting off the engine. If no "calls" on the door handles or the remote buttons on the key are activated within this 16 minute window...the car will go to SLEEP.

If you open a door or window or push a remote key button...then the car will AWAKE and components that are connected to the P-bus will begin to operate in preparations of you getting in the car. The little fan in the IHKA panel, the Nav CPU, door actuators etc (all connected to the GM)...start preparing for take off.

When you went back out to the car and sat in it...you caused the car to AWAKE...so that is why you still hear the little fan in the IHKA control panel. Next time, roll the window down and come back 16 minutes later, or stay inside the car and don't open anything...after 16 minutes...the fan should stop running. But again, if you lift the door handle or unlock the vehicle, or stick the key in the ignition, etc...the little fan will start running again.

If you have an automatic tranny, you should also see a little orange lit illuminated on the gearshift.




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  #14  
Old 10-20-2013, 05:25 AM
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i am going to go out later and take the paper and sit in there for 16-20 mins to see if it goes off. battery didn't drain overnight, when i went in the car this morning to listen for the noise i level of noise was a fraction of what it was last night.. i had to sit really still and listen for it this morning. maybe 1/5th of what it was last night
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  #15  
Old 10-20-2013, 01:24 PM
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Just an FYI: below is an image of the little fan inside the IHKA control unit...you can see how dust can build up on it...which is what can make it sound louder the older the vehicle gets. If you take a good look at the left vent on the front of your IHKA control panel...take note if it has a build up of dust. If it does, take a small brush (like an old toothbrush) and clean out that vent. That vent is where air is drawn in by the little fan:

Image below by: Mario
***

Images below by: Farnarkler (fan is held on spindle by magnet only)
***

***
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  #16  
Old 09-28-2016, 03:47 PM
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IHKA Unit Still Running

Thank you so much for this response (as I know the post is really old)
I have an e53 x5 2005.

So if I understand your post properly, the fan running in the IHKA unit after turning the car off is normal? I did happen to be sitting in the car for about 20 minutes and I did hear the car completely shut off after 16 minutes and the fan stopped.

Does this mean that I do NOT need to replace the IHKA unit? That's what I was told because the mechanic never heard of the unit making that sound for so long and he suggested that perhaps that is what killed my battery.

Thanks!

-PRDivaMichelle
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  #17  
Old 09-28-2016, 04:56 PM
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Quote:
Originally Posted by prdivamichelle View Post
Thank you so much for this response (as I know the post is really old)
I have an e53 x5 2005.

So if I understand your post properly, the fan running in the IHKA unit after turning the car off is normal? I did happen to be sitting in the car for about 20 minutes and I did hear the car completely shut off after 16 minutes and the fan stopped.

Does this mean that I do NOT need to replace the IHKA unit? That's what I was told because the mechanic never heard of the unit making that sound for so long and he suggested that perhaps that is what killed my battery.

Thanks!

-PRDivaMichelle
Yes...the SLEEP MODE (aka consumer cut off) initiates after 16 minutes when there are no calls on the P-bus...or in regards to the "consumer cut off"...the doors aren't open, windows down, etc, etc....and yes, this would include the IHKA control panel.

If your IHKA control panel has no other issues other than the little fan on the inside is still running after the ignition is shut off...but then turns off after 16 minutes with no "calls"...then replacing it will be a waste of money...because the new one will operate the same way.

The IHKA turns on when the doors are unlocked with remote key or the door handles are lifted etc...in preparation to be boarded. It turns on the little fan so that the cabin's air is drawn in across the thermistor on the circuit board. This tells the IHKA control panel what the temperature is inside the cabin...thus it prepares to maximize the system to get the cabin to the temperature that has been selected on the panel. It continues to run after shut down 9up to 16 minutes) in case the driver comes back to the car...it is still prepared to keep the cabin at the selected temperature.






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Last edited by Qsilver7; 09-28-2016 at 05:04 PM.
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  #18  
Old 09-29-2016, 01:27 PM
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Thank you so much for the explanation and response! I really, really appreciate it!
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  #19  
Old 10-21-2016, 03:59 PM
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I have the same issue happening to my 2005 X5 4.4i and my cars battery keeps dying. It sounds as if something is still on also after car is turned off and key is taken out. I haven't any idea what is causing this issue and I need to fix it. Anyone else know what's the cause.
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  #20  
Old 10-21-2016, 04:16 PM
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Oops I just saw the post above with an explanation for this thank you
This is one issue off my list of problems with this car. I have so many problems with this car anyone want to help fix them so I can drive it, would be nice. Thanks for the helpful information.
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