The easy way to resolve the issue is to write down the wire colours and corresponding pin numbers of the suspect TCU connection, then compare to the Euro and USA-phone wiring in the WDS.

Determine what you have based on hard cold facts.

Correct any wiring that is different, so that the TCU is then cabled the same as a USA-TCU.

If this is too technical for you, go to an autoelectrician and ask him to do it.

If plugging in the TCU is causing the nav screen to shut down, then it can only be affecting the power supply, and must be blowing a fuse.

Check what fuse blew, that will tell you which wire on what pin is the issue at the moment, compare with WDS and correct the wiring. If the wiring is correct and the TCU blows a fuse, the TCU must be faulty.

If your description of "shut down" means something else, then please be more descriptive so we can understand what is happening.

Maybe the databus is being blocked by the TCU, and that would mean you would have no control or display of any data.

Thanks Jochen.

To clarify - when i plug in the TCU, I can't turn on the nav monitor. No radio etc.

I'll check out the pins and compare as you suggested as well.

The TCU isn't faulty because with the previous harness I had bluetooth working fine.

Chances are if there is a difference with the US and EU specs TCU harness then I've got the EURO version harness and US version TCU (since it was in the car when i purchased it and working)

thanks again for the responses.

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2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2

Time to compare TCU wiring:

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

Euro ULF
54p black connector.
Key pins:
15=ibus
17=Term30 (permanent power)
18=not used
35=TermR (ignition switch power)
36=Ground
52=Illumination
54=not used
== same as US TCU

BIT interface with Siemens phone
54p black connector.
Key pins:
13=ibus !!!!!
17=Loudspeaker !!!
24=Ground
25=Term30 (permanent power)
31, 32=Term 30
33,34 = Ground
42=Ground
43=Term30
== MAJOR wiring differences between BIT wiring and ULF/TCU

CONCLUSION: Your loom is wired for a different Telephone module.
Because you don't know what your loom was made for the ONLY solution to your problem is to pull the connector housing off the loom's telephone connector and document all fitted pins and wire colours.

THEN re-pin the connector to match your telephone unit that you are fitting
(Re-pin = remove wire from existing connector pin number, and insert to new pin number. Use small jewellers scredrivew to push down the locking tab to remove the wire.)

Refer to the WDS for your correct pin numbers and wire colours.

After an hours or so of repinning you'll have the problem fixed.

You guys are the best. Thanks Jochen. This definitely makes sense and thanks for the above research. NOW i think I can handle this. LOL. I just have to figure out where pin 1 is

Once it stop's raining here I'll pop the trunk and take a look at this.

So here's a thought - it's most likely that I have BIT right? Since it looks like power and ground are on different wires it could possibly cause my issue of absolutely no power to anything else. Just a thought - could be completely off and you can feel free to say "stop assuming.. just go check the pins.."

__________________
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2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2

Written on the connector. It's small, use a good light and a magnifying glass if your eyes are no longer so young :-)

NO NO NO - you cannot leap to conclusions just because I found 1 out of many different TEL types that is different to the USA TCU.

The WDS shows around 20 different TEL types and I did not check them all.

You MUST document the wire colours and pin numbers, that is the ONLY way to find out what you loom is cabled for.

Understood. No quick and easy way. LOL. I'll report back with findings as i'm sure i'll need help finding the right one in WDS.

__________________
--
2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2

Ignore WDS for now.
Document the wire colors and pin numbers.
We can tell you what to do once you have provided the documented wire colors and pin numbers.

sounds like a plan.

__________________
--
2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2