9C4A – stepper motor dynamic pressure
 

So A/C and heat vents starting having issue. When A/C switched on and fan is running sounds like pressure is being released out of a soda bottle that was shook-up and slowly being release. Turn the fan off and sound goes away
Assuming that this air leaking past a vents that is not getting opened all the way?
With no A/C on no Air from middle vents left/right sides
Defrost blows hard and hor
Already confirmed iDrive settings


get the following
BimmerGeeks ProTool

Date: 11.23.21 11:26 AM

Vin: 4USFE435X7LY79830
Chassis: E70
Model: X5 3.0si
Engine: N52
Body Style: off-road vehicle
++++++++++++++++++++++++++++++++++++++++++++
JBBF [JBBF70] | A6CF: AUC sensor <<<<---- Ordered new one

JBBF [JBBF70] | 9C69: Rear-cabin stratification adjuster

KLIMA [IHKA70] | 2007 x5 9C4A: Dynamic-pressure-flap motor

KLIMA [IHKA70] | E729: No message (automatic air recirculation control sensor, 0x2D0), receiver integrated automatic heating / air conditioning system, transmitter JBE <<<---- Related to AUC Sensor?

KLIMA [IHKA70] | E728: No message (rear stratification, 0x2D3), receiver integrated automatic heating / air conditioning system, transmitter JBE <<<---- Related to AUC Sensor?

+++++++++++++++++++++++++++
Found this on xoutpost
https://xoutpost.com/attachments/x5-...b_64_07_07.pdf

and also

https://ia801005.us.archive.org/11/i...ntrol%20WB.pdf

Is this #2 on page 16?
Dynamic pressure compensation, actuator motor

https://www.fcpeuro.com/products/bmw...eo-64119321034


Thanks in advanced

(Still trying to get ISTA to run on my Laptop)

Do you have any diagnostic tools like INPA, ISTA or OBD readers/apps?

Edit: Ooops, just read the bottom of your post. If you can get ISTA running you can test all the various ~13 flaps and read their states.

Yes I do, BimmerGeeks ProTool Right now

Have tried several times without success to get ISTA running on a laptop. I get it installed but when connecting to the car it does not read or no communication.

I know that would be really helpful. Can you recommend a link with up to date instructions (win10) and links for download?

Also might be the cable that I am using?
https://www.bimmergeeks.net/product-...dition-k-dcan1

Will that one work or do I need

^ That cable looks good. I would trust it for the E70. Getting ISTA running can be a bear. I recently got it working on my 3rd attempt. The software packages have gotten better in terms of "ease of install." PM'ing you on possible source.

Your AUC sensor will take care of the A6CF.

9C69 could be tougher. In the E60/E61 there is a wire that gets pinched/frayed inside the center console that causes the symptoms you describe. I went through that. Apparently a problem in multiple chassis, not sure about the E70. Here is a thread mentioning it for the E90: https://www.e90post.com/forums/showthread.php?t=1288626.

Not familiar with your other 3 IHKA70 codes.

I'd start with the AUC sensor and then go from there.

Good luck.

Awesome thanks for the update and PM downloaded and will wipe the laptop and try again.

Ill update once the AUC sensor gets her on the 10th. At least that will be an easy swap.:D

I saw that thread in my searching, The A/C Compressor is engaging when the A/C is turned on just not getting any Cold Air through the vents. Just get a sound that I can only describe is the sound of a propane tank getting filled up

So I think that the vent flags are not opening up like they should and only a sliver is opening and creating the sound. Thus my focus on the Dynamic Pressure flag.

I am going to pull the vent cover and see if the I can see the flaps moving.

Ill keep updating as hope progress is made

Update after replacing the AUC sensor and clear code for the day

Initially had this showing up on a BimmerGeeks ProTools Scan

Vin: 4USFE435X7LY79830
Chassis: E70
Model: X5 3.0si
Engine: N52
Body Style: off-road vehicle
++++++++++++++++++++++++++++++++++++++++++++
FRM [FRM_70] | 9CC5: Mirror heating, driver's side, faulty
JBBF [JBBF70] | A6CF: AUC sensor <<<<---- Ordered new one

JBBF [JBBF70] | 9C69: Rear-cabin stratification adjuster

KLIMA [IHKA70] | 2007 x5 9C4A: Dynamic-pressure-flap motor

KLIMA [IHKA70] | E729: No message (automatic air recirculation control sensor, 0x2D0), receiver integrated automatic heating / air conditioning system, transmitter JBE <<<---- Related to AUC Sensor?

KLIMA [IHKA70] | E728: No message (rear stratification, 0x2D3), receiver integrated automatic heating / air conditioning system, transmitter JBE <<<---- Related to AUC Sensor?


Replaced the AUC sensor, cleared codes and so far so good.

Only codes left that I need to fix

FRM [FRM_70] | 9CC5: Mirror heating, driver's side, faulty <<<<---- This morror was replaced this summer by a body shop, need to confirm everything is connected and fuse is good


KLIMA [IHKA70] | 2007 x5 9C4A: Dynamic-pressure-flap motor

Figured out that you can use ProTool to test all the Flaps oprmomg and closing. All responde except The Dynamic Pressure Flag when testing

Is this the correct part ?? If so should be able to access it under the passenger side footwell?

https://www.fcpeuro.com/products/bmw...eo-64119321034

Did the body shop install the correct type mirror?

The mirror was bough at a BMW salvage yard

# 51167179633
2007-2013 BMW X5 (E70) LEFT DRIVER P-FOLD AUTO DIM HEATED DOOR MIRROR

So poss. that the heating element is bad. Everything else works....I am more concerned about the Dynamic Pressure Flap because right now I have not Cold air that blows. I can feel cold air its like its being blocked.

As per the testing of all the FLAPs the only one that does not respond to the test is the dynamic pressure flap

Just looking for confirmation that I am going to be ordering the correct part to replace.:dunno:

Anyone? :dunno:

I ordered that very same part for a problem that ended up being an issue with the IHKA controller. So it may or may not fix your issue.

Mine was reporting the stratification flap + a Lin Bus error, but as I understand it, the Lin Bus issue will cause all the other codes to show up. I followed all the steps outlined elsewhere, included the dynamic stepper motor steps (went ahead and tried a new part just in case).

I can confirm that's the part that will fit under the glove box, below/behind the blower motor. It's really easy to access and remove/install.