My headunit appears to be in working order, but I beleive my nakamichi amp has either died or (hopefully) just a fuse is blown. I've looked in the kick panel and under the hood, I could only find the Raido 2 fuse and it was fine. Where else can I look?

 

I had this problem and I had to replace the amp...

 

lucky for me, I was able to find Radio fuse 1, no need to replace the amp. How much did that thing cost you?

 

I just ran out of my factory warrenty but I complained to Lexus they game the amp for free (brand new) I paid 90 for the instllation.