Hello Keith,
If you open the boot with the key removed from the ignition switch and wait a few minutes, does the red light on the sat. nav. disc drive/computer extinguish?
If it doesn't, your guess is probably correct that water ingress has killed the unit. The solution is to seek a replacement on e-bay or from a member of this club.
Yes, the TV tuner is analogue.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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