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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > ConnectedDrive / I-Drive / Navigation Related Discussion > Retrofitting 6FL or Combox in a car without any factory MULF/TCU



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      02-09-2020, 10:55 PM   #1
sparkyblue
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Retrofitting 6FL or Combox in a car without any factory MULF/TCU

I'm a bit perplexed here, as I have recently purchased a 2010 E82 135i equipped with CIC. Unfortunately, the original owner did not opt for 6FL (USB/AUX) or Bluetooth Calling; thus I am missing ANY MULF/TCU modules in the trunk.

I am familiar with retrofitting Combox, as I did a CCC->CIC+Combox upgrade on my 2007 E90 335xi and it was fairly straightforward.

However, as my 2010 135i does not have any MULF/TCU modules in the trunk at all, there is NO wiring for the MOST loop or any other connections.

Does anyone know if it's feasible to retrofit either a 6FL OR Combox in my car?

I have seen some info where people mention it would be much easier to install just a 6FL by tapping into the CIC wiring up by the glovebox (instead of installing a MULF/TCF in the trunk).

I am aware that doing a Combox retrofit will likely require installing the entire harness (with everything in the bundle) to the trunk... thus I would be content with JUST a 6FL (and using my Tune2Air).

Note: I have a 2008 135i which I've totaled, so I have a entire parts car I can rip the harness from... my 2008 135i has both the wiring in the trunk + MULF/TCU.

Does anyone know where all the wiring in the trunk for the MULF/TCU leads to? And if it's feasible to retrofit the harness into my 2010?

VIN: VK81096

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P337A M Sports Package
S710A M Leather Steering Wheel
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S403A Glass Roof Electrical
S423A Floor Mats Velours
S428A Warning Triangle And First Aid Kit
S442A Cup Holder
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S473A Armrest Front

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S645A BMW US Radio

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S502A Headlight Cleaning System
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S863A Retailer Directory Europe
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Last edited by sparkyblue; 02-09-2020 at 11:05 PM..
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      02-10-2020, 03:48 PM   #2
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Does your car have the most hub in the rear seat area? That would get fiber most of the way to the trunk. You can get what you need from the donor car easily.

Regarding the rest of the wiring, it goes all over the place. The good news is you don't need most of it for either MULF or Combox. The only required wires are the bluetooth antenna, the 3 microphone wires and power/ground. Your tune2air can live in the trunk with an ebay aux. Just remove the pins from the white connetor and put them in the combox or mulf.
https://www.ebay.com/itm/Car-AUX-USB...oAAOSw6qReOHTv

The link below will show where the factory setup gets power/ground and so on. ``

http://www.zen104526.zen.co.uk/320d/...trofit%201.pdf

But if you are OCD and want to do it the factory way, start taking apart the parts car wiring from the back forward. Use a razor blade to carefully remove the needed wires from the bundles. At a minimum, you will need to do this for the bluetooth antenna wire.
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      02-11-2020, 12:26 AM   #3
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Originally Posted by smass View Post
Does your car have the most hub in the rear seat area? That would get fiber most of the way to the trunk. You can get what you need from the donor car easily.

Regarding the rest of the wiring, it goes all over the place. The good news is you don't need most of it for either MULF or Combox. The only required wires are the bluetooth antenna, the 3 microphone wires and power/ground. Your tune2air can live in the trunk with an ebay aux. Just remove the pins from the white connetor and put them in the combox or mulf.
https://www.ebay.com/itm/Car-AUX-USB...oAAOSw6qReOHTv

The link below will show where the factory setup gets power/ground and so on. ``

http://www.zen104526.zen.co.uk/320d/...trofit%201.pdf

But if you are OCD and want to do it the factory way, start taking apart the parts car wiring from the back forward. Use a razor blade to carefully remove the needed wires from the bundles. At a minimum, you will need to do this for the bluetooth antenna wire.
I should have a MOST hub somewhere in the mid-rear of the car, as my 2010 135i has a Top-HIFI Amp somewhere back there.

Damn, I really wish BMW would stop being cheap with these cost-cutting measures (removing trunk key, alarm pre-wiring, telephone pre-wiring, etc).

Where would I find the Bluetooth antenna? My vehicle did not come with Bluetooth telephone or anything Bluetooth related from the factory.

Similarly, where do I find the microphone wires? While my car did come with S620A (Voice Control) package from the factory; unfortunately BMW moved the voice control logic from the MULF unit to the CIC head unit in 2010, so my car does not have MULF or wiring for it in the trunk. Despite what the document you linked says (thank you!! very helpful still), which mentioned if I had S620A package, it would have MULF in the trunk (applied only 2008 models).

I am not OCD, and I honestly just want to be able to use my Tune2Air to be able to control songs via steering wheel controls. I can forego Combox (Bluetooth A2DP), and just live with Tune2Air... I honestly want the simplest install possible, so I'm trying to grasp your method of getting the eBay AUX/USB parts and connecting it to the Combox/MULF.

So you're saying I can retrofit the Combox/MULF with just: MOST loop, Bluetooth Antenna (for what? and where do I connect this to?), 3 mic pins (again, where do I find these?), and power/ground?
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      02-11-2020, 10:53 AM   #4
smass
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Sorry but I don't know component locations for the E82. I only know E90 and E70. Taking the wrecked car apart will answer most of your questions but it is not required.

So let's make this as simple as possible for MULF with tune2 air only (no handsfree calling over Bluetooth). Take the new car apart and find the most loop. Then steal what fiber you need from the old car. Go on eBay and order the aux wiring. The 3 pins in the white eBay connector can be removed from the housing and put in the MULF housing to make the connection for aux audio in. Look at combox retrofits DIYs to see what the pins are. Mulf pin locations are shown in combix diys. One is attached below.

Run generic power and ground wire to the fuse block and use a fues tap. Steal the wiring/pins from your wrecked car to splice to.

https://www.ebay.com/itm/5-Pack-12V-...e/233449717749


Option 1
If you want combox without handsfree calling, do above but get an eBay generic BMW Bluetooth antenna. The BT antenna can also live in the trunk.

https://www.ebay.com/itm/Carplay-App...temCondition=3

Option 2
If you want to add hands free voice calls to either of the above you will need a mic. Something like this will work. I am not sure if 4m is long enough so you may need to extend them. Once again, remove the pins from the green connector and insert them into the appropriate holes of the MULF or Combox connector.

https://www.ebay.com/itm/OEM-Car-Blu...W/331825406233
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File Type: pdf CIC-Combox Retrofit for E63s.pdf (2.33 MB, 6 views)
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