BMW 1-Series Forum (F20) 135i - > Second Generation 1 Series Forum > DIY Guides and Instructions > DIY: F20 F21 Power Folding auto dimming & dipping mirrors
Post Reply
Thread Tools Search this Thread
      03-06-2017, 03:36 PM   #1
New Member

Drives: F20
Join Date: Mar 2017
Location: Germany

iTrader: (0)

DIY: F20 F21 Power Folding auto dimming & dipping mirrors

Hi guys,

I'm new at the forum and I drive a BMW F20.

As with all DIY projects, undertake this at your own risk. I am not responsible for anything that happens to you or your car!

I did the power folding auto dimming retrofit with dip function to my F20 - I want to share that with you - and by the way - sorry for my english, I'm not a native speaker.

F20 118i 11/2011
normal heating mirrors
auto Timing back mirror

Needed Parts:
- 2 x Mirror with power folding functionality
- new switch for the mirror control with the folding button

- shrink tubing
- soldering colt
- Torx screwdriver
- plastic tools for the door covers

The mirrors in the normal setup where directly connected to the switch on the driver side. So they are directly controlled. In the new setup they are Controlled via Lin BUS. These are basically the differences.
On the driver side, Lin Bus is already there - on the passenger side not ...

Opportunities ? Later more ...

1. lower the Panel on both sides and put the mirror glas on both sides in the upset possible position.

2. disconnect battery

3.remove both door covers. (some torx screws, use a plastic tool to remove them safely). Dont kill the metal clips at the top!

4. remove both inner doof frames where the small speakers are located. The frames are also tightened with clips.

5.Remove the mirror glas with a plastic tool from the bottom. Lever it towards yourself slowly. Reattach the tool several times around the glas. Afterwards remove the mirror cover. It is tightened at three points inside the mirror with some kind of plastic clips. Four hands instead of two helped a lot here
Two hands try to loosen the clips, the other two should try to remove the cover.
Same for the other side.

6. Now it is possible to remove the mirrors. It is tightened with three torx screws (one is hided unter some rubber).
Loose the mirror connector plug first.

7. Mount the new mirrors in the same way you removed the old ones. Plug in the cable.

8.Now the mounting is finished. Driver side is plug and play, if you replace the switch ... Because Lin is already located there (you remember - I mentioned this before) But what is about the passenger side?

So I did some research in the Internet and in Rhinegold and I started to wondering what happened with the three cables which were used in the old "normal" variant? You are guessing right - nothing. So they will remain useless.

But - how many cables do we need for getting the passenger mirror working? - We will need three of them. Perfect - this sound ideal. One little problem is the cabel profile - it is not the same than in the original wire ring diagram. But from my point of view - this is not a big problem. Not much power running through it.

So - we are able to proceed:

9. Following steps are needed on the connector of S35 (at the passenger switch)
Pin 7,8,9 are the useless pins which where directly connected to the passenger mirror.
I've opened the connector and connected the following pins with the soldering bolt. ( you can do it how ever you prefer ... )

Pin 7 mit Pin 1 (ground)
Pin 8 mit Pin 2 (Lin Bus)
Pin 9 mit Pin 10 (power)

You can see the disconnected cables from pin 7,8,9 and the connected cables to the mentioned above pins.

10. Put everything together

11. Connect Battery

12. Code: Add 430 to FA and code FEM VO


Thanks and feel free to ask if something is unclear.

Attached Images
Appreciate 0
      03-16-2017, 05:35 AM   #2

Drives: BMW 1series F20
Join Date: Mar 2017
Location: West Yorkshire.UK

iTrader: (0)

Hi Tim,
I'm a new member, do you have a copy of the wiring diagram for the F20 standard wing mirror (not folding or auto-dim).
Appreciate 0
      09-23-2017, 02:48 AM   #3

Drives: f 20 116 ed
Join Date: Sep 2017
Location: GREECE

iTrader: (0)

Hi i have bought an auto dim internal mirror but i can not find a way to activate it.PLEASE can you post a photo of the existing wiring of your car???
Appreciate 0
      08-19-2018, 02:40 AM   #4
New Member

Drives: Bmw116 F20
Join Date: Aug 2014
Location: Sydney, Australia

iTrader: (0)

Just done this retrofit and it works. I did exactly what VIPER wrote above.

Thanks VIPER!!!

Here are the wiring diagrams.

Last edited by Raygbmw1; 08-19-2018 at 05:21 AM..
Appreciate 0
      03-05-2019, 11:33 PM   #5

Drives: F20 116i
Join Date: Mar 2019
Location: Europe

iTrader: (0)

Also got it working by following your instructions, however, i had to add the following two options with coding to get the switch button and dipping function to work:

ASP_BEIKLAPPEN set to aktive
Appreciate 0
Post Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 06:25 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.,,,,,,,,, logo and trademark are properties of BIMMERPOST