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It's not the receiver, it's the interface. If you recently had this unit installed with a door chime or, some other type of LAN data interface to replace the door chimes, the adjustment is off. The interface/door chime needs to accessed to turn the volume down. The interface is neccessary because when you remove the factory stereo from a newer GM vehicle you lose the door chimes, accessory 12 volt power source, ON Star, etc. The LAN data interface replaces these features when adding an aftermarket stereo.
The four RCAs are for the speaker outputs.They plug into the rear of the Pioneer unit (front and rear outputs). Also, you didn't mention the model number of the wiring harness (necessary to properly diagnose the situation) but, some these units have one or two philips head dials to adjust the volume of the stereo and the volume of the chime. These dials may be on the side of the unit or, oyu may need to open the casing to see them.
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Have you check remote wire, it might be labeled Acc or something. it tells the radio to turn on some people wire it to the power wire but you have to wire switch because it stays on and kills battery.I had that problem and it ended up being door chime fuse because remote was fused to that. Good Luck
With the stock radio installed, turn on your parking lights and listen for the chime (same sound for key in ignition with ignition off and door opened). Does the sound come from the front left speaker or from behind the dash? If it comes from behind the dash, disconnect factory stereo and turn lights on again, id the chime still there or does it go away? If the sound comes from the left front speaker or goes away when you unplug the factory stereo, you need a different harness, its called a chime harness Pac Audio part #C2R-GM32R, could be the thing you need.
GM's Door Chimes Are built in to the stock radio. You need to buy a door chime relocator if it really bothers you. They Are about $30. I got one but the chime it came with was loud and annoying, so i cut the wire to the tiny speaker the relocator comes with just so didnt have to hear it. So, if it really bothers you, go to your local car audio store and ask for a door chime relocator for GM vehicle, they should know what you are talking about.
Keep in mind that there are always two fuses in any vehicle that provide power to the radio. One fuse is for switched power, one for constant power. Both fuses need to be good before the radio will work. Often one of the fuses, especially the constant power fuse, is shared with other electrical circuits and may not be labeled as a radio fuse.
Check all the fuses in the vehicle, including any fuse box under the hood. See if any other electrical systems in the car aren't working, especially the dome light, cigarette lighter, door chime buzzer, or clock.