E60 - DIY How to make a Combox plug & play retrofit harness
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Joined: Sep 2012
Posts: 246
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From: Greensboro, NC (USA)
E60 - DIY How to make a Combox plug & play retrofit harness
This is how you build a harness to simply plug in your new combox module without cutting any wires on your car and without re-pinning an connectors on the car (only applicable to cars with CIC or CIC retrofits of course..). This particular guide is only for cars with TCU's ONLY, but I can help with MULF systems as well.
Here's the basics of what you need:
Combox side:
1 x 61136913644, BMW, connector, 26 pin
1 x 61136913626, BMW, socket housing, 26 pin
~15 (order 20) x 928999-6, TE, female pins (BMW has these too, but they are like $1 a piece, easier to just buy them from onlinecomponents.com. Exact same thing
22 AWG wire
TCU side:
1 x 37758, Kufatec, 54 pin connector. socket housing is included
~15 (order 20) 1-928918-1, TE, male pins (BMW has these too, easier to just buy them from onlinecomponents.com. Exact same thing)
Here's what it looks like in the end:
Combox end. The blue'ish green connector has the pins labeled so you can use that to figure it out
TCU end below. Notice I wrote pin #'s on connector--bottom is 37, top is 54. On the next row down (towards the floor in the pic), bottom pin is 19, top is 36. and Bottom row, bottom is 1, top is 18
And here is how it is wired:
That's it. The only elusive part is the black connector from kufatec. It takes a full 4 weeks to get them in.. so I ordered 3 
I'll post more detail on how to crimp the wires, etc. when I have more time
You can also buy these on eBay if you search worldwide for them, they run about $100. Kufatec also has them for about that
Here's the basics of what you need:
Combox side:
1 x 61136913644, BMW, connector, 26 pin
1 x 61136913626, BMW, socket housing, 26 pin
~15 (order 20) x 928999-6, TE, female pins (BMW has these too, but they are like $1 a piece, easier to just buy them from onlinecomponents.com. Exact same thing
22 AWG wire
TCU side:
1 x 37758, Kufatec, 54 pin connector. socket housing is included
~15 (order 20) 1-928918-1, TE, male pins (BMW has these too, easier to just buy them from onlinecomponents.com. Exact same thing)
Here's what it looks like in the end:
Combox end. The blue'ish green connector has the pins labeled so you can use that to figure it out
TCU end below. Notice I wrote pin #'s on connector--bottom is 37, top is 54. On the next row down (towards the floor in the pic), bottom pin is 19, top is 36. and Bottom row, bottom is 1, top is 18
And here is how it is wired:
TCU---------------------------------Combox
Pin---Description--------------Pin---Description
1----Mic(pos)------------------------25----Mic(pos)
4----AUX-GND-----------------------10----AUX-GND
15---Crash Sig.----------------------7----Crash Sig.
17---30 Power+ 5A------------------2----30 Power+ 5A
18---30 Power+ 10A-----------------1----30 Power+ 10A
19---MIC(neg)-----------------------12-----MIC(neg)
21---MIC Shield----------------------11-----MIC Shield
23---Shield---------------------------22-----Shield
31---SOS sig.f Button---------------18-----SOS sig.f Button
33---Wakeup-------------------------15-----Wakeup
36---31 GROUND(neg)--------------14----31 GROUND(neg)
37---emerg. Speak.(pos)------------21----emerg. Speak.(pos)
38---emerg. Speak.(neg)------------20----emerg. Speak.(neg)
50---emerg. butt LED----------------17----emerg. butt LED
54---GROUND-
Pin---Description--------------Pin---Description
1----Mic(pos)------------------------25----Mic(pos)
4----AUX-GND-----------------------10----AUX-GND
15---Crash Sig.----------------------7----Crash Sig.
17---30 Power+ 5A------------------2----30 Power+ 5A
18---30 Power+ 10A-----------------1----30 Power+ 10A
19---MIC(neg)-----------------------12-----MIC(neg)
21---MIC Shield----------------------11-----MIC Shield
23---Shield---------------------------22-----Shield
31---SOS sig.f Button---------------18-----SOS sig.f Button
33---Wakeup-------------------------15-----Wakeup
36---31 GROUND(neg)--------------14----31 GROUND(neg)
37---emerg. Speak.(pos)------------21----emerg. Speak.(pos)
38---emerg. Speak.(neg)------------20----emerg. Speak.(neg)
50---emerg. butt LED----------------17----emerg. butt LED
54---GROUND-
I'll post more detail on how to crimp the wires, etc. when I have more time
You can also buy these on eBay if you search worldwide for them, they run about $100. Kufatec also has them for about that
New Members
Joined: Dec 2019
Posts: 119
Likes: 8
From: London, UK
My Ride: 535d M Sport
This is how you build a harness to simply plug in your new combox module without cutting any wires on your car and without re-pinning an connectors on the car (only applicable to cars with CIC or CIC retrofits of course..). This particular guide is only for cars with TCU's ONLY, but I can help with MULF systems as well.
Here's the basics of what you need:
Combox side:
1 x 61136913644, BMW, connector, 26 pin
1 x 61136913626, BMW, socket housing, 26 pin
~15 (order 20) x 928999-6, TE, female pins (BMW has these too, but they are like $1 a piece, easier to just buy them from onlinecomponents.com. Exact same thing
22 AWG wire
TCU side:
1 x 37758, Kufatec, 54 pin connector. socket housing is included
~15 (order 20) 1-928918-1, TE, male pins (BMW has these too, easier to just buy them from onlinecomponents.com. Exact same thing)
Here's what it looks like in the end:
Attachment 160047
Combox end. The blue'ish green connector has the pins labeled so you can use that to figure it out
Attachment 160048
TCU end below. Notice I wrote pin #'s on connector--bottom is 37, top is 54. On the next row down (towards the floor in the pic), bottom pin is 19, top is 36. and Bottom row, bottom is 1, top is 18
Attachment 160049
And here is how it is wired:
That's it. The only elusive part is the black connector from kufatec. It takes a full 4 weeks to get them in.. so I ordered 3
I'll post more detail on how to crimp the wires, etc. when I have more time
You can also buy these on eBay if you search worldwide for them, they run about $100. Kufatec also has them for about that
Here's the basics of what you need:
Combox side:
1 x 61136913644, BMW, connector, 26 pin
1 x 61136913626, BMW, socket housing, 26 pin
~15 (order 20) x 928999-6, TE, female pins (BMW has these too, but they are like $1 a piece, easier to just buy them from onlinecomponents.com. Exact same thing
22 AWG wire
TCU side:
1 x 37758, Kufatec, 54 pin connector. socket housing is included
~15 (order 20) 1-928918-1, TE, male pins (BMW has these too, easier to just buy them from onlinecomponents.com. Exact same thing)
Here's what it looks like in the end:
Attachment 160047
Combox end. The blue'ish green connector has the pins labeled so you can use that to figure it out
Attachment 160048
TCU end below. Notice I wrote pin #'s on connector--bottom is 37, top is 54. On the next row down (towards the floor in the pic), bottom pin is 19, top is 36. and Bottom row, bottom is 1, top is 18
Attachment 160049
And here is how it is wired:
That's it. The only elusive part is the black connector from kufatec. It takes a full 4 weeks to get them in.. so I ordered 3
I'll post more detail on how to crimp the wires, etc. when I have more time
You can also buy these on eBay if you search worldwide for them, they run about $100. Kufatec also has them for about that
You will need 22AWG (0.35mm²) wire, but 20AWG (0.5mm²) wire for both power and ground. It needs to be Thin Wall wire.
Based in the UK i ordered the contact pins from Farnell 100 of each.
Part numbers below:-
£45
100 x 5-928999-6 Female
100 x 6-928918-1 Male
€60
Kufatec with pins x 2
Crimping tool £30
IWISS SN-58B 0.25-1.5MM², AWG24-16 Non-insulated Crimper for Dupont Jumper Wire EPS PCIE SATA PINS MOLEX JST Terminals https://amzn.eu/d/4MoXFq8
1 x 54 Pin Connector Cap BMW £10 6920068
revised part number for this is
61132471244
Last edited by smartshah; Dec 13, 2022 at 09:46 AM.
Probation Members
Joined: Mar 2023
Posts: 1
Likes: 0
From: Latvia
My Ride: BMW e61
Model Year: 2008
Engine: M57N2
Can't figure it out
Hello! I can't figure it out. I want to install combox, but I can't find MULF module. Is it possible that my car does not have it? I have e61 2008 year with oem cic. TCU is right under the floor, but where others have MULF, I only have PDC modules. No sign of wires for MULF module anywhere at the back. Can you confirm that it might not have?
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