9C4A – stepper motor dynamic pressure

[Toothbrush]

Originally Posted by HellRazor35

Thanks for the update... I understand that there are a lot of false positives with bimmer codes...reason I am really leaning towards replacing the part is that when I try and activate the motor I can hear it and it keeps cycling like its trying to move....unlike the other flap motors.

When I activate them to 50% via the BimmerGeeks ProTool that activate then shut down and a noticeable change happens in the vents and air flow..


What exactly does the the Dynamic-pressure-flap motor control?

That's pretty interesting that you can hear a change trying to happen. Is it like a clicking sound?

The flap that stepper motor controls just changes whether or not you get inside or outside air. Once you remove that stepper motor, you can actually physically move the flap with your fingers.

Just FYI, the white section of the stepper motor only fits one way, so you may have to hold it up against where it attaches while it cycles around until it lines up. You don't have to push hard or anything, just hold it up where it would screw in until it moves to the correct position and slips on. you can see from the image there's a flat section that has to line up properly. Very easy to do.

Also, in case anybody is ever curious, I've attached a quick video showing the center vent blend doors working.