PFL auto mirror tilt in reverse?

Kenny F

Registered User
Does anyone happen to know if you can enable auto mirror down tilt when the car is put in reverse?

Random and lazy I know !
 

HertS3

Registered User
You should be able to even if you don't have power folding mirrors using Carista or OBDEleven
 

bentwenty

Registered User
Yes it is, I’ve done it on my 63 plate 8V, using VCDS.
It doesn’t quite work as expect on some control module versions though, so I have not used it after the initial novelty wore off.
The issue is that the control module isn’t able to accurately store the original ‘pre-dipped’ position, so my mirror would never return the exactly the same place when in a forward gear, usually slightly higher. This meant that I’d always have to manually adjust it before driving, making the feature a little useless.
I’m not sure if this affects all PFL cars, but that was my experience.
 

HertS3

Registered User
Yeah my friend's FL does the same thing, doesn't quite go back to the right position but close to it

My PFL returns to the same position, possibly because I have folding mirrors?
 

bentwenty

Registered User
Yeah my friend's FL does the same thing, doesn't quite go back to the right position but close to it

My PFL returns to the same position, possibly because I have folding mirrors?

Yeah that sounds familiar, I would imagine your control module has that capability where as others don’t.
 

Kenny F

Registered User
I need to look into this . Wish i’d thought about this when Alex was doing my cruise control :(
 

AlS3BE

Registered User
My s3 came with non folding mirrors and they never returned to the same position. Some days were ok/close but other days it will point to the sky.
Retrofitted folding mirrors and it works. Goes back to same position every time. I’m using the same door modules that was used with the non folding mirrors. So it’s more than just the door modules that keeps the memory.
 

Rcord

Registered User
My s3 came with non folding mirrors and they never returned to the same position. Some days were ok/close but other days it will point to the sky.
Retrofitted folding mirrors and it works. Goes back to same position every time. I’m using the same door modules that was used with the non folding mirrors. So it’s more than just the door modules that keeps the memory.

Maybe you are just lucky. I have folding mirrors and the glass rarely returns to the exact position, most of the times going back pointing slightly higher than it was. I guess it depends on the manufacturing process of the memory motor that makes some units more precise than others. As far as I know, there's an analogue resistive memory inside the motor (like a potentiometer). I've measured the resistance of one of those devices and it ranged from 1.2 k to 2.7 k at each end of the vertical movement. It seems that the door module stores the current value before dipping, using a single byte A/D converter. When it has to move the glass back to position it moves the motor while reading the position (again through the one byte A/D converter) until it reaches the stored value. Not a high precision process. I don't know there is a so terrible memory mirror positioning in other models or brands, but I suppose there would be a lot of complaining from owners, especially in models that have multiple memories for seat and mirror positions.
 

AlS3BE

Registered User
Maybe you are just lucky. I have folding mirrors and the glass rarely returns to the exact position, most of the times going back pointing slightly higher than it was. I guess it depends on the manufacturing process of the memory motor that makes some units more precise than others. As far as I know, there's an analogue resistive memory inside the motor (like a potentiometer). I've measured the resistance of one of those devices and it ranged from 1.2 k to 2.7 k at each end of the vertical movement. It seems that the door module stores the current value before dipping, using a single byte A/D converter. When it has to move the glass back to position it moves the motor while reading the position (again through the one byte A/D converter) until it reaches the stored value. Not a high precision process. I don't know there is a so terrible memory mirror positioning in other models or brands, but I suppose there would be a lot of complaining from owners, especially in models that have multiple memories for seat and mirror positions.

I’ve never had a problem with mine. Was the same with my other a6’s the one with folding mirrors returned to same position and one without never return to same position.
 
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