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[speedy_ns]

Hope it starts for you for a Christmas present  🎁

Hardly   :'(
Last night ECU came from ''specialist'' completely dead. ( Here in Serbia we would say : ''Killed as a rabbit'' ) Not even diagnostics worked.
We tried to put ECU, immobiliser and transponder from a donor car, and same immobiliser fault is shown on diagnostic ( same before specialist tried to fix the first one), and the car is still cranking but no start.
Now we'll try to disable immobiliser on first ecu ( if it's not fried) and then we'll see.
Rail pressure fault is solved, so now we wait for immobiliser delete ( hopefully successful ). Wiring is definitely showing it's age at this point.

[speedy_ns]

Still no luck 
After Christmas and winter holiday I took Omega back from mechanic with no results.
Current situation is this:
Factory ECU/immobiliser is giving me P1613 - immobiliser no or wrong signal. Car reads immo and key but engine don't start..

ECU/imobiliser from donor car is giving B3045 - Anti theft signal voltage low, and it doesn't recognize key ( B3061 wrong transponder key, b3055 transponder key problem) which doesn't make sense cause it worked fine on donor car..
Now I'm trying to find someone who can do Immo off on this donor car ECU, and then we'll see what happens.
Does anyone have any better ideas??

[Doctor Gollum]

You need the wiring from the donor.

Don't cut it, dismantle and replace the lot.

Basically three sections...

Entire dash loom, footwell to engine bay, engine bay to ECU.

And for the naysayers, to check the entire harness for damage means stripping it out any way, so you may as well replace the lot. And as you know the donor worked, then it rules out the harness and connectors.

And whilst you are in there, change the heater matrix

A cheap test would be to separate all the connection points in the circuit and clean them with contact cleaner then test the relevant circuits for continuity/resistance. It might save replacing the loom, but I wouldn't bank on it.

[speedy_ns]

At this point, if that is only step I can take, i'm throwing the towel.
Omega is registered and MOT-ed until June. If I don't make it work buy then, she will be dismantled and sold in spares.

[Doctor Gollum]

It's a couple of weekends work if you're focused.

Also, the dash wiring is fundamentally the same car to car.

A quick note, the donor was another car with the same drivetrain?

[speedy_ns]

Yes, same drivetrain, just one year older.
I have incomplete wiring from previous donor also, but I don't have time, or will to do wiring.
Couple years earlier I walked away from similar 3.0 Omega with full Irmscher pack just because somebody did dodgy LPG install and I couldn't be bothered with wiring, vacuums and similar stuff.

[Doctor Gollum]

That's your choice.

Swapping complete looms over is quite satisfying. The alternative is to run individual wires but that's a ball ache.