I haven’t ever written a guide before so please bear with me

I will try and keep this as short and simple as possible, and I won’t go into detail in every area as there are loads of guides out there already for door card removal etc.  The main focus of this guide is the wiring side which is where I initially got stuck.

I now have a fully working reverse dip mirror on my passenger mirror with no errors.
I can confirm that this works 100% and you don’t need the memory module on the drivers side. If you later wanted to add power folding mirrors or auto dimming mirrors this module will handle that as well (although I don’t personally plan to add those and you would then also need the drivers side module)

 

What you need:

1 – Memory mirror motor and wiring loom - 3D0959578C
2 – Memory door module - 5Q4959592B

How to do it
1 – remove door card and door mirror
2 – replace mirror motor with new one
3 – snake the new wiring alongside the existing wiring and connect the additional wires into the 16pin connector that goes in to the door module
4 – change a few settings with VCDS

Parts needed:
Memory Mirror motor, part number 3D0959578C, The standard mirror motor has only 3 wires in its connector, the upgraded one has an 8 pin connector and uses 7 wires.

I got this one from Ali express which includes the 8 pin connector and the wiring which was longer than I needed, also was pre wired with the correct pins on the end to insert straight into the 16 pin connector that goes in to the door module

https://www.aliexpress.com/item/32350405340.html?spm=a2g0s.9042311.0.0.49254c4dP8nHxR

Memory door module, part number 5Q4959592B. I picked one up 2^nd hand on ebay for £15, and there are loads on there.

The job can be made slightly easier if you use a set of plastic trim removal tools like these

https://www.ebay.co.uk/itm/12Pcs-Car-Trim-Door-Panel-Removal-Molding-Set-Kit-Pouch-Pry-Tool-Interior-DIY/154017521367?epid=12022344510&hash=item23dc28ded7:g:yXoAAOSwtPlbYVfh

but it can be done without.

 

Step1 - remove the door card, follow this guide

 

Removing the mirror is easy, from memory there was just a single screw holding this in place, I managed to remove it with a torx bit, but that wasn’t the right bit.

Once you have removed the mirror housing, you can strip the mirror down, replace the mirror motor with the new one and feed the new wiring through the mirror (just follow the old wiring).

I then snaked the new wiring alongside the old wiring and wrapped it all in cloth tape. The exisiting connector was just tucked away but if you wanted to you could remove it.

The Wiring

I found a few guides on line with wiring instructions but none of them worked.
A lot of them referenced pin 12, my module was missing pin 12 so I knew these guides weren’t for me.

The wiring for me was as follows (16 pin is door side into the module, 8 pin is the connector that goes in to the mirror), there are a number of wires that go in to the mirror that aren’t on the motor connector, these should be left untouched.

 

On the 16 pin module they are

PIN3 – black/blue – common ground
PIN15 – Red/black – heated mirror
PIN11 – Yellow – indicator

 

So onto the 8 pin connector

Mirror controls, these 3 wires replace the original 3 wires, so these will need removing from the 16 pin connector.
Mirror number, Colour, 16 pin connector number
Pin2, White > Pin7
Pin6, brown/white> Pin5
Pin8, Red> Pin8
 

This leaves 4 wires yellow/white, blue/brown, grey/white, grey.

These wires handle the x/y co-ordinates on the mirror, 1 set handles the position reporting, and 1 handles the return values, if you get these mixed up the mirror displays erratic behaviour and whenever it tries to move it will go in seemingly random directions, I resolved this by swapping around a couple of the wires and came up with this

Mirror number, Colour, 16 pin connector
Pin1, Yellow/White > Pin14
Pin3, Blue/Brown > Pin16
Pin5, Grey/White > Pin4
Pin7, Grey > Pin13

I have done these 4 from memory as I stupidly forgot to take note of the final wire positions before I put the door card back on.

 

Untested are the other positions on the 16 pin connector (taken from a german forum), these might be useful in future for anyone wanting to add the other features
1 orange boarding spot +
2 black / gray mirror dimming
6 black / green mirror dimming
9 pink motor mirror folding mass
10 gray motor mirror folding +

Did you have any issues with this mirror motor, do they adjustments work in the same direction?

Everything works correctly as if it were a factory option. 

There is some coding that needs doing in vcds i forgot about that in the guide,  I'll add it in when I get chance,  but the info is in the vcds sticky already,  just need to also tick the option that says memory mirror installed.  That was already selected on my replacement module. 

Great 😀

I got a mirror motor from Aliexpress that seems be behave different than the original motor. The up/down and left/right motors are swapped compared with the colors on the wires (white and red). When I swop the wires, the direction both ways are swopped as well. So is seem the polarity of the motors themselves are different. 

 

This is without connecting the other wires for the positioning. I verified it with a power supply as well, and they are indeed different. Anyone else seen this? 

I finally came to the bottom of this. I solved the direction problem by swapping out the motors from the old unit. Apparently, they are made with different directions. Left/right and up/down had to be swapped as well, pin 2 and 8 on the mirror connector. The joystick will only supply the motors with the correct polarity and doesn't care about the feedback from the potmeters, and this combination of motors and pins are the only one that works with this unit.

 

When I tried the reverse dip, they mirror goes in the complete different direction. So I had to swap both potmeter sentertaps, pin 3 and 7,  and the top and bottom connection, pin 5 and 1, as well to get it right. 

 

So I ended up with the following:

Mirror connector - Control unit

8 - 7 (left/right motor)

3 - 13 (left/right position)

5 - 14  (pot bottom)

1 - 4 (pot top)

7 -16 (up/down pot)

2 - 8 (up/down motor)

6  - 5 (motor common)

 

The marking on the new mirror motor is the same as in the original post, 3D0959578C. So either, the motor using is assembled wrong or the marking is wrong. This if for a LHD car BTW, but as far as I can see, the motor units are equal on both sides.