My wife has a 2002 Camry with JBL sound system with amplifier. I installed a Pioneer AVH-280BT and used a Metra 70-8113 Amplifier Integration Harness. After matching the wires and plugging in the RCA Outputs to the back of the Pioneer radio, I was only getting sound of out the front speakers "and tweeters". I adjusted the RCA Speaker Outputs, and now only getting sound out of the rear speakers, after countless combinations, I can only get music out of 2 speakers at once "example left front and right rear or right front and right rear, left front and left rear, left front and right front, etc...." After further inspection, i can only get sound of out the far right RCA jacks on the pioneer radio, i have a photo bellow for reference. It does not matter what speaker combination I use, it only works for the far right RCA jacks.
When i hook up my front speakers to the far right RCA jack and my rear speakers tot he far left RCA jack, i do get a weak "subwoofer" sound coming from the rear speakers but no music. What am I missing? I appreciate any help, thank you!
When i hook up my front speakers to the far right RCA jack and my rear speakers tot he far left RCA jack, i do get a weak "subwoofer" sound coming from the rear speakers but no music. What am I missing? I appreciate any help, thank you!

