To access the four bolts retaining the climate/radio control assembly, the veneered console wood panel and the center vents have to be removed.
That's easier said than done.
Follow this pictorial and you will avoid damage to your costly interior trim. My pictorial applies to late LS400 series cars - it shows my 2000 LS400.
Why would you want to remove the radio? Well, if it's faulty it has to be repaired. But I have more nefarious reasons.
Watch this space.