So i have the Pioneer Premier AVIC-F90BT headunit all wired up to a Rockford Fosgate Punch P400-4 (the new series) and all the speakers wired up to it.

I have the power wire going down the driver's side of the car, and the two front speakers wires going down the passenger side of the car, and the RCA cable down the center of the car.

When i previously had the RCA cable with the speaker wires, there was a buzzing noise on start up and occassionally kept going after start up, when i move the RCA cables around at the connection or unplug them, it either gets louder or stops, (so i know that it's the cable).

I moved it last night away from the speaker cables away from the RCA and it went away on one start up, and now it keeps doing it....

HELP!!!! It's driving me crazy and i can't put the new carpet in until i figure this out.......


MAIN QUESTION: is that a bad RCA cable, Bad Connection, or interference with something else? or even something im not thinking about?

 

try a new "test" set of rca's. if no go you could always try a ground loop isolator. another trick is to run a ground from your radio all the way back to your amp ground. if still no go you could have a bad solder connection on the amp or on the radio. there are also some small noise filter caps in both the radio and amp and could be blown up.

 

well i'm thinking it's the RCA's because i move them away from everything and it still does it, if its not that its the connector on the radio unit or the amp unit.....

I'll try to get some RCA cables and see if that works first.... cause i have never heard of any of the other things you are talking about...

 

Check the complete wiring of the audio system. The main problem is in that only.

 

now this is what i was told let me know if this is correct.....

To test the components:

pull all RCA cords from the amplifier, if no sound is heard, amp is bad

pull RCA cords from the head unit, if no sounds is heard, h/u is bad

if both times sound exists when you pull all the wires from one side, and then the other then it is the RCA's and i should buy new ones, instead of grounding the RCA's or anything like that.....

is that correct or am i accidentally switching things around?

 

when my amp went out, all it was constant interference even when the rca's were pulled. to op, is the interference getting louder/more high pitched as your rpm's go up or is it staying constant. if it is getting louder than it is a bad ground on your amp. like it was said earlier run a ground from your hu to your amp and see if that changes anything. if it is just constant i am leaning more towards your amp being out than the output on the hu.

 

no its not an interference with the alternator, like your asking, this is all without turning the car on...

i tried a new set of rca's and ran them outside of the car just to be double safe and it still is occuring...

i was going to do that too run a ground from the head unit to the amp, and see if that changes....

my best guess is that when all my stuff got stolen, (amps, subs, and deck) i bet the ground was wiggled loose or something so i am going to check those tonight, and double check the wiring on the h/u to see if anything looks goofy and all the grounds everywhere....

if its nothing like that i'm bringing the headunit and amp in to get tested.

any suggestions you can think of to specifically check while i am doing this? I appreciate the help a ton!

 

If there is noise without engine running you have a grounding problem, it may be the amp ground, the HU ground or a ground in the amp or HU.

Try this, unplug the RCAs at the HU, lick your thump and touch it to the RCA ends, [one at a time] making sure you touch both the center pin and the outside "ground", if you get the "buzz" the problem is the amps ground or in the amp, a slight hum is normal.

If no buzz, the problem is in the HU or it's ground.

Make sure HU grind lead is connected properly, make sur HU has a chassis ground, [from chassis of HU to cars chassis].

A dump ground, [ground lead from chassis of HU to amps chassis is unlikely to do anything, it is used to get rid of/limit alt. whine, but can't hurt to try.

Another thing you can try is a temp. connection of another HU, if no noise, your Pioneer HU is the problem, if the noise is still there the problem is the amp, you can do the same thing with another amp. 94

 

i just went through every single ground and cleaned it off and eliminated any potential problem there coming from off the amp, off the battery, and off the headunit, and no luck....

i'm still gonna try the seperate ground onto the cars chasis rather than into the wiring harness and see if that does anything, i'm taking the amp in to get tested tomorrow....

the only thing i have left is the HU as the problem or the amp.... everything else works fine becuase i haven't changed a thing since the old system, just new wiring harness for the deck, RCA's, deck and amp, so i think i have limited it either the deck or the amp....

i will let you know what i find out tomorrow, i appreciate all the help, honda-tech rocks!

 

it was a bad amp, faulty connection on the rear speaker part of the amp, had it tested, and got it replaced under warranty!

Thanks for your help guys!