Re: help regarding JBL premium AMP?!?!
These JBL harnesses are a pain in the you know what. I would guess that the harness you have in your Celica, the non-JBL, is not the same as the JBL harness. This would mean one or more wires are improperly connected to the wrong source wire(s) on the new JBL-headunit.
My solution here is going to be get rid of the amp and use an aftermarket amp. Nothing too fancy. Get a Line-Out Converter (LOC) to hook up the new amp. Search Google for that, they run about $30-50. The LOC will create a set of pre-amp RCA plugs from the speaker wires. Run the NAV wires to the LOC, then the LOC's RCA to the AMP.
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