OK well i installed my Avh-p4000 head unit today. its a double din tv screen and i thought i got all the wiring right. the wiring harness i am using is the metra 70-1787. i connected everything together and i was playing my music and i don't have any sound coming from the front door speakers. the wiring harness has 4 RCA inputs that are green purple grey and white i have the green and purple hooked up to the back and the grey and white hooked up in the front. i tryed almost everything i could but i can't seem to get all 4 doors to play music. my car is a 2004 A4 with the bose system. if anyone knows how to fix this problem please let me know!!!!!!!!!!!!!!

 

I believe our cars have a two amp system in them so sounds like to me you don't have the front wired correctly. Are you sure the unit has its internal amp on? I know some head units you can turn off.

 

yes im am pretty sure my other amps our off. the only amps i have on are the ones that are powering my JL Sub and my rear speakers. i can get the fronts to work