The 54-pin adapter plug is part number 84.12-0 308 375. I would build your custom wiring based on this.

I think that the caller voice output is line-level, because that would normally route through either the radio or AMP, depending on year and options of the car. I don't think that ever drives speakers directly.

__________________
SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input

Also appears to be available loose, but from Audi

4E0 972 144 54 pin multilock (Audi) £1.47
000-979-010 Pins for the connector £0.97 each

Jochen

Please feel free to call me an idiot but i still cant figure out WDS. Hopefully you will see i have tried . . .

I've selected E53, then selected Communication>Telecommunication>Basic Interface Telephone (Bit II) (SES Language-input system with BIT Basis Interface Telephone from 2003_03)

That shows a diagram with component U407

So i look up U407 and get Component and signal information>Components>U)Radio/interferance supression equipment>U407 Basic Interface, telephone>U407 Basic Interface Telephone (Fixed Mounting, siemens (cordless handset) from 2002_03)

But i cant find the pin out list for this.

When i search for the TCU (I01157) it comes up with Components>I_Components of outside manufacturer>I01157 Telematcis Control Unit (TCU_Everest) (without USA_LHD)

and then i can see a table of all the Pin assignments at plug connector X18500

Where can i go from here? The only pin out i can find for BIT2 is X4038

but that doesn't show "Basic Interface Telephone (Fixed Mounting, siemens (cordless handset) from 2002_03)" only "up to 2002_3

So shich plugs should i be comparing? X18500 and X4038 seem so different

X4038 - Siemens Internal (Eject Box) at pins 1,2, 5, 19, 20, 37, 38, 48
X18500 - Telephone, Internal (Eject Box) at pins 3, 5, 6, 32
I can work these back using the wiring diagram for A117 Eject Box, but that only shows the pins for BIT, and not diagram for TCU. BIT has 8, TCU has 4, happy to leave 4 disconnected but without colours for the TCU wires i dont know which wire from the TCU goes to which pins on the eject box

X4038 - Comunication Link TXD RXD and Sheild at 9, 10, 11
X18500 - NO SUCH CONNECTIONS
See attached picture, it doesn't go anywhere? Can i leave it off?

X4038 - Data Cable (Navigation Unit) at pin 28 and 46
X18500 - NO SUCH CONNECTIONS
See attached picture, it doesn't go anywhere? Can i leave it off?

X18500 - Night Light Signal pin 52
X4038 - no such connection
I can get this from the eject box, pin 3 (X4545)

Attached Images

  

The circuit diagram shows connector numbers, and also shows the connector pins, wire colour, wire size and wire function.
Just click the connector number for a full table.

Thats all the info you need.
You see the wiring and signals of the existing BIT2
You see the wiring and signals of the wanted new TCU

Simply transfer the relevant wires from the old to the new

Of course, some will be no longer required, and you may need to reassign some wires running from phone to the eject box.

But it is pretty straight forward.

Work in this order:
Ground
Ibus
Power
Microphone
Audio Out
Eject Box
SOS switch (if fitted)

That's all you need.

Hi Jochen - thanks for taking the time to reply. I've done all the wires i thought i needed, and now it comes up 'Activate Phone' on the nav screen correctly, but i'm unable to get the TCU to go into pairing mode.

Not for me it doesn't! When i look at the TCU wiring diagram it doesn't give me wire colours. So i have no idea how to give the TCU the 4 wires from the eject box it needs, when the BIT2 had EIGHT wires.

(see diagrams below)

Its only simple if you know how to do it.

Ground - done
Ibus - done
Power - done
Microphone - done
Audio Out - done
Eject Box - NOT DONE/CANT DO


Why do i need to connect the eject box anyway? I want to use bluetooth, i have no interest in pluggin in my phone?

Attached Images

  

If you don't want the eject box then don't wire it. Just ignore it.

The only functions the eject box provide are:
1. phone charging
2. passive antenna coupling
3. physical holding of the phone

Pairing mode of the TCU is initiated automatically when you turn the ignition from off to acc/on, but only for first 15s or so

Jochen

OK i'll leave the eject box off

But it still doesn't pair

Going to start from scratch and see if i made any mistakes.

if Telephone appears in the nav menu then you have done sufficient wiring to make the TCU pair.

Of course, you must have the Bluetooth antenna connected!

Note that
1. The Bluetooth may be turned off in the TCU - what is the history of the TCU? Where did it come from? Has it ever been coded?

2. Not all phones see the BMW TCU via Bluetooth. Try another phone...

Bluetooth antenna is connected (brand new one)

Not sure of the history. Guess i'll be ordering navcoder and interface to find out.

I thought Bluetooth always came coded on, but VR needed turning on.

Cheers

Neil