Now my 2004 LS430 has the same problem. Have you fix the radio?
I have a LX 470 w/the Levinson system. The FM volume is stuck at a barely audible level. AM and CD volume work fine. Dealer says I have to replace the whole system. Any ideas on repairs?? Obviously the speakers work b/c when I switch to CD (forgetting about the volume issue) the volume blows my ears!