I just replace my JBL unit in my 2006 Camry. It is the JBL 6-CD in-dash, with satellite hookup (but I don't have sattelite).
There are two connectors on the Radio itself - one for the steering wheel controls, the other for everything else (plust the two antenna connectors).
At the JBL amp (behind the glove compartment) there are two connectors
- one goes to the radio, the other to the speakers and ground.
However, in the area where the radio is removed, there is an extra set of connectors hidden from view (you have to pull the cables out from the dash itself). These two connectors fit the standard $20 Toyota harness you can get anywhere. Unplugging the connectors bypasses the amp, so you can use aftermarket.
You don't need any crutchfield overpriced crap if you have these cables. Good luck!