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First, sorry about the length of the post.
I Thought I'd share this here and it seems to come up on other forums.
I've made my own BT loom as I didn't fancy paying a dealer £150 for the harness (update: NLA from dealers), I started looking on the internet about a DIY custom solution, an OEM ULF with a custom harness, after all the OEM ULF is just a BT module with an I-Bus interface, right.
Since my car has the 40 quadlock and SatNav, custom making the 54pin ULF harness was very straight forward, here is the 54pin pinouts.
Pinouts
=====================================
BM54 - Main, 16 Pin Quadlock Connector
X13646-10----------------------- MUTE -----------------------PIN 51 ULF
X13646-12----------------------- GND ------------------------PIN 36 ULF
X13646-15----------------------- +12 V Perm----------------PIN 17 ULF
X13646-16----------------------- +12 V Switched------------PIN 35 ULF
X13646-9------------------------ I-BUS -----------------------PIN 15 ULF
X13646-11----------------------- TEL ON ---------------------PIN 33 ULF
BM54 - Small, 12 pin connector (C Btm right)
X13649-6---------------------- Tel Audio Out + --------------PIN 37 ULF
X13649-12--------------------- Tel Audio Out - --------------PIN 38 ULF
Extras, MIC:
MIC + ----------------------------------------------------------PIN 1 ULF
MIC - ----------------------------------------------------------PIN 19 ULF
MIC Shield-----------------------------------------------------PIN 21 ULF
Eject box, 18 Pin elo connector
=====================================
GND-----------------------(Pairing switch)--/ ----------------PIN 32 ULF
Cradle_On--------------------------------------------------------PIN 11 ULF
Pin 1 = Green (PAIRING)
Pin 2 = Brown (GROUND)
Pin 5 = Red (ign or direct 12v +)
Pin 13 = White (Cradle_On) Pin 11 of ULF.
Or
Pin-7 Pairing Button------------PIN 32
Pin-8 Cradle_On
Pin-10 12v+
Pin-17 Ground.
I started by getting the 54pin plug from the dealer, as it was on back order, I looked around and came across the same plug used by Audi for there BT module, I ordered the plug and connectors, and they were here within 3 days.
54 Pin connector £1.97 ($4) Audi Dealer - Audi p/n 4e0-972-144.
Pins for connector £3.01 ea Audi Dealer - Audi p/n 000-979-010.
Several things of eBay:
Pair button ---------------£1.30 ($2.60), I didn't bother with the eject box as the phone is always charged and BT enabled, now changed to the OEM cradle (I got one cheap).
Leads (Mic & Switch)-----£4.49 ($10), used 2.5mm speaker lead. (as they don't have to carry any high voltages, I thought this would be OK, and it seems to work just fine).
Then I made up the 54pin plug.
I used 5m of lead for the Mic and 3m of lead for the Pair button, normal HQ speaker lead is fine for whats needed and exceeds the spec of the OEM wire thats used, and give very good results.
This is the finished result and work as OEM.
I had to get several bits from the dealer (its hard to believe but they were cheaper than eBay).
Antenna, antenna fakra lead, antenna bracket and mic.
The satnav detected the BT module straight away.
then select phone
Go through pair process and bobs you uncle.
Total outlay is approx £180 ($360), sound quality is much better than that of the nokia kit and I now have full integration with the MFSW/ SatNav display, as well as voice control, the phone book has transferred and you can use the buttons on the display to call and receive calls.
Well pleased with the results.
The beauty of the DIY option is that its bespoke, all the inputs/outputs are self contained in the retrofit loom, unlike the OEM BT loom which picks up inputs from all over the car (power/switched power/gnd/i-bus/tel on/mute etc).
HTH
P.S
I should have mentioned, mine was a lot easier to install than the OEM harness, I fitted mine without having to remove the passenger seat (as OEM), so I installed it in under 2 hours, not the 10 the the dealers say it takes.
Extra bits needed.
Bluetooth Antenna, BMW p/n 84-50-6-928-461,
Bluetooth Antenna bracket, BMW p/n 84-13-6-912-160,
FARKA ULF to Antenna, BMW p/n 61-12-6-912-541,
Microphone, BMW p/n 84-31-6 938-762, (saloon/coupe only)
Microphone Cover, BMW p/n 51-44-8 250-108,
Also, Since I would have been watching the tv anyway I don't count the time taken to make the loom up, but its roughly 4 - 5 Hours start to finish
I Thought I'd share this here and it seems to come up on other forums.
I've made my own BT loom as I didn't fancy paying a dealer £150 for the harness (update: NLA from dealers), I started looking on the internet about a DIY custom solution, an OEM ULF with a custom harness, after all the OEM ULF is just a BT module with an I-Bus interface, right.
Since my car has the 40 quadlock and SatNav, custom making the 54pin ULF harness was very straight forward, here is the 54pin pinouts.
Pinouts
=====================================
BM54 - Main, 16 Pin Quadlock Connector
X13646-10----------------------- MUTE -----------------------PIN 51 ULF
X13646-12----------------------- GND ------------------------PIN 36 ULF
X13646-15----------------------- +12 V Perm----------------PIN 17 ULF
X13646-16----------------------- +12 V Switched------------PIN 35 ULF
X13646-9------------------------ I-BUS -----------------------PIN 15 ULF
X13646-11----------------------- TEL ON ---------------------PIN 33 ULF
BM54 - Small, 12 pin connector (C Btm right)
X13649-6---------------------- Tel Audio Out + --------------PIN 37 ULF
X13649-12--------------------- Tel Audio Out - --------------PIN 38 ULF
Extras, MIC:
MIC + ----------------------------------------------------------PIN 1 ULF
MIC - ----------------------------------------------------------PIN 19 ULF
MIC Shield-----------------------------------------------------PIN 21 ULF
Eject box, 18 Pin elo connector
=====================================
GND-----------------------(Pairing switch)--/ ----------------PIN 32 ULF
Cradle_On--------------------------------------------------------PIN 11 ULF
Pin 1 = Green (PAIRING)
Pin 2 = Brown (GROUND)
Pin 5 = Red (ign or direct 12v +)
Pin 13 = White (Cradle_On) Pin 11 of ULF.
Or
Pin-7 Pairing Button------------PIN 32
Pin-8 Cradle_On
Pin-10 12v+
Pin-17 Ground.
I started by getting the 54pin plug from the dealer, as it was on back order, I looked around and came across the same plug used by Audi for there BT module, I ordered the plug and connectors, and they were here within 3 days.
54 Pin connector £1.97 ($4) Audi Dealer - Audi p/n 4e0-972-144.

Pins for connector £3.01 ea Audi Dealer - Audi p/n 000-979-010.

Several things of eBay:
Pair button ---------------£1.30 ($2.60), I didn't bother with the eject box as the phone is always charged and BT enabled, now changed to the OEM cradle (I got one cheap).

Leads (Mic & Switch)-----£4.49 ($10), used 2.5mm speaker lead. (as they don't have to carry any high voltages, I thought this would be OK, and it seems to work just fine).
Then I made up the 54pin plug.

I used 5m of lead for the Mic and 3m of lead for the Pair button, normal HQ speaker lead is fine for whats needed and exceeds the spec of the OEM wire thats used, and give very good results.
This is the finished result and work as OEM.

I had to get several bits from the dealer (its hard to believe but they were cheaper than eBay).
Antenna, antenna fakra lead, antenna bracket and mic.


The satnav detected the BT module straight away.

then select phone

Go through pair process and bobs you uncle.
Total outlay is approx £180 ($360), sound quality is much better than that of the nokia kit and I now have full integration with the MFSW/ SatNav display, as well as voice control, the phone book has transferred and you can use the buttons on the display to call and receive calls.
Well pleased with the results.
The beauty of the DIY option is that its bespoke, all the inputs/outputs are self contained in the retrofit loom, unlike the OEM BT loom which picks up inputs from all over the car (power/switched power/gnd/i-bus/tel on/mute etc).
HTH
P.S
I should have mentioned, mine was a lot easier to install than the OEM harness, I fitted mine without having to remove the passenger seat (as OEM), so I installed it in under 2 hours, not the 10 the the dealers say it takes.
Extra bits needed.
Bluetooth Antenna, BMW p/n 84-50-6-928-461,
Bluetooth Antenna bracket, BMW p/n 84-13-6-912-160,
FARKA ULF to Antenna, BMW p/n 61-12-6-912-541,
Microphone, BMW p/n 84-31-6 938-762, (saloon/coupe only)
Microphone Cover, BMW p/n 51-44-8 250-108,
Also, Since I would have been watching the tv anyway I don't count the time taken to make the loom up, but its roughly 4 - 5 Hours start to finish
Last edited: