Sounds like you have some loose speaker wires somewhere, or touching wires. check to make sure ALL wire connections are solid, and sealed with tape or a connecter. if any wire is touching any metal on the car or another wire it will cause interference
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After confirming speaker is not getting the audio, need to work toward the audio output. Your next stop will be the audio output from the power amplifier (if there is one), or if the audio is coming out of the car radio. If audio is at the source output (or amp out), you have a broken wire between the source and the speaker. Bypass this wire to test.
First check whether the connector for the speaker wires is firmly plugged in behind the radio. Try unplugging and replugging to make sure. (Note: the connector may be attached to the radio or it may be on the end of a short length of wire.)
If the speakers are firmly plugged in and you still don't get sound, the next step is to test the speakers. Do this by unplugging the wires behind the radio, then run a meter across one pair (for one speaker) to make sure you don't have an open circuit (broken connection). Alternatively, feed audio from the speaker outputs on a boombox or other stereo to that pair of wires. If you don't get sound or if the meter says there's an open circuit or direct short, either the speakers are bad or there's a broken wire between the radio and the speakers. Most bad connections happen at one end of a wire or the other, so look at the connectors at the radio and at the speakers.
Finally, if the speakers do check out, you'll have to test the car radio itself. Run a pair of wires for one speaker from the radio's outputs to an external speaker (any working speaker will do). If there's no sound, your radio is broken.
Of course, the easy way to do this is take it to a place that installs car radios. They can check it out quite easily and make recommendations. Don't take it to a Chevy dealer. They'll charge you a fortune, and if the radio is bad, they'll sell a refurbished unit for more than you'd pay for a high-end Kenwood or Pioneer.
The sub settings for testing should be: Crossover frequency - Max; Volume - Mid; Phase - Normal.
As a quick test, unplug the sub cab from the amplifier/receiver end. Switch on the sub and turn the volume down all the way. Briefly put your finger across to short the RCA/phono tip and ring. The sub should make a buzzing sound. You now know that the sub is working and the cable appears to be okay or not.
If you've got power then that's a good thing. It could be something simple as a broken solder joint or bulging capacitor.
Ensure that the sound is actually supposed to be coming through the speakers. Just because the power is on doesn't mean that audio information is actually on it's way to the actual speakers. Maybe the television volume is low or muted, maybe the output volume is being routed somewhere else, or maybe the soundbar is broken. You should investigate and follow the signal to find the problem.
Sounds like either a headlight switch or a broken ground. Did you lose both the hi and low beams? Do your parking lights work? The headlight switch outputs to the hi/low selector on the column. If both hi and low beams are out I would check output voltage from the switch. Sounds ike that make be your issue. Good luck and let me know if I can assist further.
This is an indication that the actual sound output is working, but the amplifiers to the speakers are not. How you could take care of this is to check in there are any loose connections to the speakers. Then check if you have sound coming from the leads of the output stereo amplifier (You will need the schematic and an audio tracer/tracker to find this location and test for sound). I would venture that there would be no sound from the amplifier. If not you will have to replace the amplifier chip. I would suggest getting a qualified TV technician to perform this task. If you do have sound at the output of the strereo amplifier chip, then it might be a case of the earphone jack switch being broken, let me explain when you plug in your earphone the speakers are disconnected by a switch in the earphone jack if this switch is broken it could disable the speakers and produce these results. There is also the possibility that you have the speaks disabled from the menu of your TV (check this too, actually check this first).