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If the car has an additional audio amplifier, then use the blue/white to turn on the amplifier.
If the car doesn't have external amplifier, and speakers are connected directly, then the tuner might be defective..
The number on the panel of your car stereo is not a measure of actual volume. It is just a comparative scale, with 0 being the minimum and 30 being the maximum. The volume as measured in decibels is dependent on the power level of the amplifier and impedance of the speakers. The internal amplifier puts out 22 watts per channel (50 watts peak) into 4 channels, and there are output jacks for an external amplifier(s). Product specs in link. JVC KD R850BT
You can not connect the subwoofer directly to your head unit. You need an amplifier installed to play the sub woofer. Asuming that there is an amplifier installed then:
If your head unit has an RCA output on the rear, connect that to the LINE IN of your amplifier.
Also there should be a Blue&White cable at the rear of the head unit.(amplifier remote) That should be connected the the remote terminal on the amplifier. (this will turn the amp on and off when the head unit turns on or off)
Hope this helps.
Your internal amplifier for the radio has failed (output IC). Probably due to a shorted speaker or speaker wire.
Repairing the unit will cost as much as another one.
You may be able to pick up a small used 2 or 4 channel amplifier instead and use the RCA signal to feed it for less than the repair cost.
You will be surprised in the sound difference between a dedicated amplifier, and the one built in the radio anyway!
The typical radio SAYS 50Wx4... however - realistically can put out 12-15Wattsx4
a small 25x4 or 50x2 amplifier can be had easily for under $50 used, and will make a tremendous difference in sound quality... without having to spend more on the radio for it to potentially fail again anyway.
A Dedicated amplifier will have a built in protection circuit that will shut down instead of blow the output ICs like your radio did.
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I unpluged all the wires for one more time and it works again!!! I think the problem is that one or some wires are damaged because they are pressed between the unit and its case. I also shaked them up and down and for now, it is ok. Try it!! If this works for more than one day, I' ll let you know...
i could find the manual for the KD-G321/322 but not for the 324. However they may be very similar. So if you want the manual for the 321 and 322 it's below. It may be the same way your head unit changes stations.