Hi All,
I've just bought myself a LS400, 96, 172k miles, a joy to drive.
In relation to radio back illumination, I found a shop that repaired mine for £70.50 just last week, they were very help full, he said it was a common fault and told me it is the input power for all the backing lights that go.
The address is:
Northolt Car Radio Repairs
6 Station Parade
Ealing Road
Northolt
Middlesex
UB5 5HR
Tel: 02088451525
http://www.ncrr.co.uk
Hope this helps anyone
Alan