Servo motors wigging out Key off. Anyone else?

[gearhead96]

My servo motors are constantly adjusting even when car is shut off. Anyone else had this problem? What do I need to replace? Can I just pull a fuse? Any feed back will be helpful.

[aaronz]

Maybe what you hear is your TB adjusting?

[Kamin]

That would be the throttle body adjusting. If you turn the key on, hold the gas down for 5 seconds, and then turn off the ignition with the gas pedal depressed and release once the ignition is off, you will readjust your TB... you should hear the same sounds. If the sounds are different then... I have no idea lol.

[gearhead96]

No, the noise is coming from the middle of the dash area. Saw somewhere that the servo motors for the climate control may have something to do with it. The noise is there when driving as well so i'm pretty sure its not the throttle body. Thank for the input though.

[Kamin]

Yeah, the TB noise isn't there while driving. Wish I could help. Good luck.

[Greg9]

My car does this from time to time when shutting off. the climate motors all adjust for about 5 to 10 seconds. I dont know what the prob is.

[bg18461]

My car does this, VAG says its the defrost flap servo motor. You hear it moving when the car is off, it also may move while its on. I have lived with it as the alternative is to pull the dash out to change the motor, not worth it for me...

[brewmastr]

to get to the air flap motors you do not need to pull the dash out, they are right behind the glove box, pull the glove box and you will see them out in the open and very easily accesable, i do however believe that what you are hearing is normal, not 100% sure though.

[diagnosticator]

Yes, very common. Try reseting the A/C servos by going into basic settings from Mblock 001, a row of windows will appear, wait untill the numerical value in each is 000, then turn off the key for a minuite.

[gearhead96]

How is that reset done? Please explain if possible.

[diagnosticator]

How is that reset done? Please explain if possible.

Using VCDS/VAG-COM, open the A/C controller, (AUTO or ECON mode,) save/store then clear any fault codes. Next, Read Measuring Block 001, then switch to Basic Settings. In Basic Setting Mode, the display will show a row of 6 windows with values ranging between 000 and 243, the controller will run each servo motor to establish the values of the postition feedback potentiometers on each servo at each end of the travel range. When all values shown are 000, exit the A/C controller and close VAG-COM, and turn the ignition OFF for at least a couple of minutes. Done.

Ref: Bentley

[diagnosticator]

My servo motors are constantly adjusting even when car is shut off. Anyone else had this problem? What do I need to replace? Can I just pull a fuse? Any feed back will be helpful.

Besides the servo reset procedure, Audi has revised the servos several times for this problem, with limited success. If the servos are going nuts and won't settle down, you can pull the A/C fuse/s for an overnight short term measure. Several guys have fitted better feedback pots to the servo motors claiming that solves the issue.

[sview]

no, The Noise Is Coming From The Middle Of The Dash Area. Saw Somewhere That The Servo Motors For The Climate Control May Have Something To Do With It. The Noise Is There When Driving As Well So I'm Pretty Sure Its Not The Throttle Body. Thank For The Input Though.

Have You Fixed This Problem Yet.

Any Updates???

Thanks

[pape]

Besides the servo reset procedure, Audi has revised the servos several times for this problem, with limited success. If the servos are going nuts and won't settle down, you can pull the A/C fuse/s for an overnight short term measure. Several guys have fitted better feedback pots to the servo motors claiming that solves the issue.

This sounds like a good fix. Do you know what pots they are using? would a pot of a high quality Radio control servo fit? do you know

[diagnosticator]

This sounds like a good fix. Do you know what pots they are using? would a pot of a high quality Radio control servo fit? do you know

No, I don't know what pots are being used to retrofit to the servos. I am sure it is a part from an electronics component source like Mouser Electronics. You need to examine the pots used currently then select a suitable better quality part that will fit. Besides the physical fit, the pot must have the same resistance range as the original potentiometer.

[pape]

No, I don't know what pots are being used to retrofit to the servos. I am sure it is a part from an electronics component source like Mouser Electronics. You need to examine the pots used currently then select a suitable better quality part that will fit. Besides the physical fit, the pot must have the same resistance range as the original potentiometer.

Ok, in some time Ill get to take the servo off and open it. I will post some pics and see if I find a replacment pot.

[diagnosticator]

I will be looking forward to what you find out.

[foley803]

Ok, in some time Ill get to take the servo off and open it. I will post some pics and see if I find a replacment pot.

Have any leads on a replacement potentiometer yet?

[waldo1324]

side note : all you have to do is drop the glove box and its right there. im rather just going to get new servos. anyone have a part # or cost?

[gottaBdope]

Have any leads on a replacement potentiometer yet?

Eye two would like to knoe.

[foley803]

Eye two would like to knoe.

Lol, Wht laguage r u speekn?

I tried cleaning it the first time and it lasted almost a year, now its worn a dead spot into itself and it won't open once closed.

[GTA]

I have written about this in a DYI section on this link:

http://www.audiforum.ca/a4-b5-b6-b7-...leaning-72039/

Essentially, as the flap motor units age, they may accumulate dust because they're not sealed units. I resolved my flap motor issues and all associated noises with household items, basic tools and some effort. The best part is that I didn't spend a dime and didn't have to replace anything.

Other than the noises, I wasn't getting good heating or AC cooling and I traced it to the flaps opening and closing on their own like they were possessed.

I hope this helps and good luck!

[gmudan]

I have written about this in a DYI section on this link:

http://www.audiforum.ca/a4-b5-b6-b7-...leaning-72039/

Essentially, as the flap motor units age, they may accumulate dust because they're not sealed units. I resolved my flap motor issues and all associated noises with household items, basic tools and some effort. The best part is that I didn't spend a dime and didn't have to replace anything.

Other than the noises, I wasn't getting good heating or AC cooling and I traced it to the flaps opening and closing on their own like they were possessed.

I hope this helps and good luck!

Link doesn't work.

[n7plus1]

you probably need to be logged in to view.

[imnuts]

you probably need to be logged in to view.

Nope, the link was truncated. I'm guessing something should be in place of the ... in the middle of it. In other news, the servo units are sealed, but it isn't air tight. I ripped a couple of mine apart, and there wasn't any dust in them. The problem was that the grease dried out, so they started to bind up. I just went and bought all new ones as cleaning and re-greasing them didn't really do much. Worked for a couple days, but that's it.

[Fast4esT]

Can you reset all servos, not just the a/c? Or are they all reset when you log I to the a/c. Mine do this too, for a little while after shutting car off, used to think it was the cd changer.

[GTA]

Link doesn't work.

My bad. Try again.

http://www.audiforum.ca/a4-b5-b6-b7-...leaning-72039/

[imnuts]

Can you reset all servos, not just the a/c? Or are they all reset when you log I to the a/c. Mine do this too, for a little while after shutting car off, used to think it was the cd changer.

Yes, run the adaptation after you're in the climate module and it will "home" all of the motors/flaps.

Sent from my Moto X

[texasboy21]

Yes, run the adaptation after you're in the climate module and it will "home" all of the motors/flaps.

Sent from my Moto X

I have been chasing this for a while now. Seems like every time it rains my servos start acting crazy.

[imnuts]

I have been chasing this for a while now. Seems like every time it rains my servos start acting crazy.

Mine used to do it all the time, then they slowly started to just seize up and not want to move. Eventually replaced all of them since 3 had stopped working, even after taking them apart, cleaning, and re-greasing them. Decided to replace all 7 rather than just wait for each one to fail. Now, the dash is nice and silent after I turn my car off

[Fast4esT]

How much did they cost?

[imnuts]

How much did they cost?

Total, about $350 plus shipping in parts. One was changed out at the shop, the driver's side foot well. The rest I got from GAP and did myself.

Sent from my Moto X

[coowhip]

Highly recommend replacing them instead of servicing them. Little annoying motors. If you hear things in the dash after key off, pull the glove box and visually inspect. What I was hearing was a motor not fully moving the flapper. Just minor movement sounds. I found a few used online, ebay. Look at the servo motor causing you issues, take down the part number and start searching.

[imnuts]

I posted all of the part numbers, both original and updated in another thread around here. They all have the same first 9 digits, just a different letter revision.

Sent from my Moto X

[Fast4esT]

I wonder of it's the same servos most commonly reported failing or if it's all of them

[Matteo Santucci]

Total, about $350 plus shipping in parts. One was changed out at the shop, the driver's side foot well. The rest I got from GAP and did myself.

Sent from my Moto X

GAP?


Sent from my iPhone using Audizine

[Blockis]

GAP?


Sent from my iPhone using Audizine

GenuineAudiParts.com

[Kevin C]

Also:

https://www.audizine.com/forum/showt...otor-Repair-B6

[Matteo Santucci]

GenuineAudiParts.com

Ooh thank you so much!


Sent from my iPhone using Audizine

[a4bradsd]

Was there ever any resolution to this thread???

My Details: I have a 2002 A4 B6 1.8T. Battery had been disconnected for over a year while I was doing repair work off and on. Everything is running now and I had to put a new battery in it before starting it a few weeks ago. I have an OBDeleven app running on iPhone which has some limitations. I do not have access to VCDS (so don't ask).

I have a concern that I may have a small drain on my battery. There has been some small voltage drop overnight now that I leave the new battery connected permanently. It's on the order of 0.5V which could also be related to cold weather even for a brand new battery. I have measured current draw both directly from the battery positive terminal and also in series with the Term-30 wires under the dashboard which power all the V+ to all electronics outside the ECU/plenum chamber. Why? Well back when I was first trying out my OBDeleven with the old battery (which turned out to be defective - it would charge to 12V on trickle charger but drop to 10V in a day when totally unconnected) I saw this DTC for 08 Air Conditioning module: 01206 Signal for duration of "Ignition Off, Implausible Signal" which concerned me about potential current drain with ignition off. Since installing the new battery, getting engine running and driving the car again I have not see that DTC again.

I have tested the AC system thoroughly with the controls and everything seems to work - defroster, blowers upper, middle and lower, and temp control of DS vs PS; however, I consistently get these AC DTC codes for 08 Air Conditioning: 4 passive faults
* 00710 Defroster flap motor, locked or has no voltage supply, Intermittent
* 01842 Potentiometer positioning motor, temp flap right, Intermittent
* 01274 Back pressure door motor, locked or has no voltage supply, Intermittent
* 00604 Potentiometer positioning motor, for air flap flow, Intermittent

I have measured the standby current draw from the battery, and about 1min 30sec after locking doors, when the security LED goes from steady to blinking, the current gradually drops to 25-50mA (fluctuates) which is acceptable leakage current once all Control Modules go into deep sleep. But I am concerned that the Climate Control Module aka AC Control Head aka E87 may be defective and periodically waking up when the ignition is off and car locked. IMHO it should always stay in deep sleep unless an idiot engineer designed it. BTW I am an engineer, EE. Lol

I don't really have a way to monitor current draw overnight. It's possible I could build something with an Arduino to measure and log voltage drop changes across fuses.

With regards to the noises:
After running the car and running and testing all the AC functions, I turn the AC unit completely off (all lights off). Then just after turning the ignition off, I usually hear the creak of several control flaps moving in the dashboard very briefly. I think that's normal. What bothers me though, if I sit in the car, with the ignition off, and doors locked for a period of time, I have heard in the dashboard on PS the sound of a flap opening and closing after about 5min. Then 5min later I heard it again. Like it is haunted by a ghost. Tonight after a test drive, several minutes after turning the ignition off and removing the key, and with the AC controls all off, I heard a series of clicking noises like some kind of actuator noise in the center dashboard region which lasted a couple of minutes and eventually stopped.

I will rule out all other malfunctions - flap motors, motor position sensors, etc. before I even consider replacing the AC Control Unit (E87)!

I will attempt to do the AC Control Unit reset detailed by Diagnosticator if it is possible on this not fully implemented iPhone version of OBDeleven.

Questions:

1. Has anyone verified if defective motors or positioning pots can cause the AC Control Unit to wake up long after ignition is turned off?
2. There are 3 fuses that supply voltage from Term-30 (battery +terminal always "hot") to AC System components: F1(S1) 10A and F26(S226) 30A to AC Control Head (E87) and F25(S225) 30A to the (fresh air) Air Blower Control Unit (J126). All the flap servo motor/positioning pot units are driven by direct connections to the AC Control Head (E87). Any recommendation which fuse(s) to pull to shut these servos down?