I have a 2003 gs300 installed a pioneer doublein deck with a TA07SR harness and have to turn on and off the car 2 /3 times for sound to come on need help it's driving me crazy check all wireing and everything is good I see other have had similar problem but how do I fix???

 

the TA07SR doesn't even list the GS300 as an application and I checked the Axxess TYTO-01 apps and it's not listed on that either.
you could:
1) call Scosche and hope that they have added the code to the TA07SR for the GS300 (maybe you'll need to get the updated version if they did)
or
2) yank out the OE amp and install an aftermarket one.