I am asking for input as to whether I have a bad amp or bad head unit. I have 2006 GX470 with Nav. Symptom AM/FM can manually tune to station no sound. If I hit seek on either FM or AM it scrolls and never locks onto a station. If I insert a CD the cd unit goes to disc and appears to play no sound. Volume indicator does change on display. I have verified fuses with meter and reseated both connectors to amp. I am leaning towards a bad head init as I don't think the amp could mess up the seek function on head unit? What do You think? Thank You!

 

Do you get the navigation voice out of the driver's door speaker?

Chip H.

 

Yes, the Navigation and Bluetooth to phone both work fine.

 

It's the amp. The navigation voice connects to the speaker directly (BLU & LT GRN wires) from the navigation ECU.
The stereo uses GRN & GRN/BLK wires (at that speaker).

There is a repair service on eBay and many people have gotten good work from them. Pull the fuses (Radio 1, Radio 2) then remove the amp from under the driver's seat so you can get the part number off it, and then look it up on eBay.

Chip H.