Hello I have an 02 m5. It has the 25pin din not the 54pin i tried to custom make one and connect it to a tcu i bougtht that says on it e65 everest it has a 54pin connector and also i think dsp but i am not using. I made the wire according to this and also this. But the nav would not recognize my tcu and just would have no audio coming even the radio does not play until i unplug this completely.

25 54
Pin 3------------------------Pin 36 (Ground)
Pin 4------------------------Pin 17
Pin 5------------------------Pin 35
Pin 10-----------------------Pin 51 (mute)
Pin 11-----------------------Pin 32
Pin 14-----------------------Pin 19 (mic)
Pin 15-----------------------Pin 1 (mic)
Pin 19-----------------------Pin 37 (speaker)
Pin 20-----------------------Pin 21
Pin 22-----------------------Pin 15 (ibus)
Pin 25-----------------------Pin 38 (speaker)
Pin 21-----------------------Pin 33 (tele on)

USA TCU Everest
54p black connector.
Key pins:
15=ibus
17=Term30 (permanent power)
18=Term30 (permanent power)
35=TermR (ignition switch power)
36=Ground
52=Illumination
54=Ground

25 54
8 11 E Telefon Ein (Cradle_On) Ejectbox (X4545 - 13)
21 33 A Signal Telefon Ein SES Verstärker Radio
3 36,54
4 17,18
16 52

i am very confused please help

my car had one of those crappy phones but it was missing but it has the ses and had the module connected to the 25pin and some motorola that i took out.

thanx