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well here we go how do you have your pioneer radio connected . did you run the radio speaker wire out to the factory speaker or did you have an amp connected to the rca output jacks.
1 well if the radio connect by the speaker wire out the output chip in the radio is fried and needs repair ....
2. if u have a amp connected to power your speakers for sound check the amp to make sure you have power and no lose connection or speaker wires disconnected. 3. it also possible that the rca jacks are fried too
I no by experience that pioneer loses ground on the audio output jack (rca) well what we did to fix it is.. take and 18 gauge wire stripe back about 1/2" to 1" of the insulation to expose the copper wire and wrap this around the metal casing of the rca jacks and then ground the wire to a ground point do this for both left and right rca jacks...
are you using an amplifier? if so, it sounds like you are using the blue wire (power antenna remote turn on) instead of the blue/white wire (amplifier remote turn on) to turn your amp on. the power antenna remote wire turns off when you leave tuner mode.
If you unplug the RCA's (Jack wires) and the noise goes away - your problem is induced noise. Eminating from a Engine Computer, bad amplifier or radio grounding point or close proximity to power wires in the vehicle. The only fix is to re-route the RCA wire.
If the problem persists when disconnecting the RCA's the problem is the ground loop filter (or lack thereof) in the amplifier or a bad grounding point.
Make sure your grounding point for the amplifier is bare metal (sanded off paint) and on the vehicle chassis - not a interior support bracket.
Troubleshooting noise in an audio system can be tedious.
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if the panasonic radio is a factory model, check with a GOOD car audio shop. they can get you the factory wiring harness to plug in, along with the diagram. if the panasonic is a replacement, like a jensen or kenwood, check out CSK Auto or AutoZone for a factory harness adapter. it makes life so much easier...
You may be connecting this stereo into an amplified system. If the original factory stereo worked with the factory amplifier, your stereo is not turning the amplifier on. If you purchased the aftermarket wire harness that mates to the factory stereo connector, hook up the "Amplifier Trigger" wire, this wire is usually blue.
are pressing and holding the pushbutton (after tuning to your station) until the button number show up-if you are check to see if the yellow wire on the radio has power even when the key is not on (it should have power regardless of the ignition key
There is no power from the rca jacks. Option 1; connect the speaker wires directly. Any aftermarket auto manual (Hayes, Clymer) with wiring schematics will let you know what wire is what in the dash. Option 2; RCA jacks output to an amplifier. There is no power coming from the RCA jacks. They have to be used with the amp. If you chose to use the normal speaker wires, be aware that these radios do not like stock speakers or wire. If you take the time and money to replace all of it, the head unit will last much longer. If you choose to use an amplifier, it will burn out fast unless you replace the speakers and wires immediately.