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[robson]

It all sounds a bit of hit and miss how many Omega owners have disconnected their battery only to find that they have no radio and no radio pass?

[johnnydog]

It's certainly nothing that should you should be worried about and I think you are over complicating it! It's simply advisable to connect the negative charger lead to an earth point away from the battery if possible, rather than directly onto the negative battery post - that's all there is to it! I have used a smart charger on my Omegas for many years with no problems, usually when not being used for a few weeks; the only time I disconnect the negative terminal is when they have been off the road for longer periods such as the last lockdown.
As for the radio pass - with the NCDC 2013 or 2015 in the Elite with the original radio, then you don't need the code/ pass if you disconnect the battery. With non Elite models, if you don't have the pass, you can purchase a simple memory saver device for little money to retain the radio code whilst changing or disconnecting the battery.
They use the OBD socket (some use the cigarette lighter but I prefer the OBD type) and require an external 12v power source. I use an old 12v house alarm battery which is a convenient size for this task.
It's certainly not a dark art or complicated....

[B52]

If you have CCR2006, you can also disable the code. I did mine recently when I got fed up resetting it.

[johnnydog]

Good point. Come to think of it, I had a 2.6 Elite several years ago with a CCR2006 presumeably with the code disabled, as it never needed the code inputting if I ever disconnected the battery.
Who is likely to break into an Omega to steal a CCR2006 these days? In fact the days of radio theft from cars these days is probably quite low.

[Raeturbo]

Good point. Come to think of it, I had a 2.6 Elite several years ago with a CCR2006 presumeably with the code disabled, as it never needed the code inputting if I ever disconnected the battery.
Who is likely to break into an Omega to steal a CCR2006 these days? In fact the days of radio theft from cars these days is probably quite low.

                Indeed it’s very unlikely any normal person will want to steal it.  Unless it’s one of us

[TheBoy]

Jumping direct to the battery on summat like a later X5 does alot of damage.

Not in my experience if standard precautions are always followed - and that same damage would happen irrespective of jumping posts or direct connection.

[TheBoy]

The bits that need resetting on Omega are:
Radio: All models except NCDC series  (enter code)
CD Changer: MFL, if fitted   (enter code)
Sunroof: If fitted (reset procedure)
Electric Windows (reset procedure)
Keys: MFL/FL may need resync procedure in some circumstances
Engine/Transmission: Relearn BLMs  (just drive it)

[TheBoy]

if you don't have the pass, you can purchase a simple memory saver device for little money to retain the radio code whilst changing or disconnecting the battery.
They use the OBD socket (some use the cigarette lighter but I prefer the OBD type) and require an external 12v power source. I use an old 12v house alarm battery which is a convenient size for this task.
It's certainly not a dark art or complicated....

Ciggy lighter on Omega won't work well, as its not permenently live.

[johnnydog]

if you don't have the pass, you can purchase a simple memory saver device for little money to retain the radio code whilst changing or disconnecting the battery.
They use the OBD socket (some use the cigarette lighter but I prefer the OBD type) and require an external 12v power source. I use an old 12v house alarm battery which is a convenient size for this task.
It's certainly not a dark art or complicated....

Ciggy lighter on Omega won't work well, as its not permenently live.

I should have been more specific and said ''auxilary socket'. The cigarette lighter in the front isn't permanently live but the auxiliary socket in the rear centre console remains live for about 15 mins after the ignition is switched off, which should be more than long enough to do the battery swap with an external 12v power source if not using the OBD socket.

[TheBoy]

The consumer relay would likely deactivate once the battery is off.  Need to check diagrams, but seem to recall consumer relay has a diode in it.