I turn the volume all the way up & it still sounds low,i even changed my speakers.

Check your amps inputs then outputs....

Depending on the year of the car. The factory amp may be wearing out and need to be replaced.

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The volume control on your radio is called a potentiometer, which may be going bad. It works better when its warm because materials expand as they warm up and make tighter contact with each other.

It is also a possible a bad wiring connection exists. Poor contact will cause static, poor audio quality and intermittent output.

Your radio will have plug type connector(s) Your speakers will most likely each have two wires with single female spade connectors of different widths (keeps the polarity correct) the wire with the stripe (of whatever color) will be connected to the negative (-) speaker terminal.

So you need to check all the connections, one is making poor contact.
If both speakers (assuming you have two) sound good or bad... then start with the plug connectors for the radio and any independent black ground wire coming out of the radio.

If one speakers sounds okay check the connections on the other one. You check the connections by carefully pulling the speaker wire off of the speaker and then carefully pushing it back on making sure it feels tight and secure.

PS: If you pull the fuse for the radio, the radio will have no power and will not work. The radio coming on proves the fuse is good.

PSS: Your owners manual should provide lots of information on your sound system components.

Replace the speakers if they are amplified types.

So everything is coming on but you have no sound from anything?If that is the case you may want to check the amp fuse.The car has a factory amp i'm trying to remember i think it is in the trunk.Look in your owners manuel for the fuse box location.If the fuse is good then the factory amp may be bad.Or you may have a blown speaker that is showing a short and putting the amp into protect.If the amp and or speakers are bad i highly recommend just buying after market speakers/amp.The price for the factory equipment is very high and there labor rates even higher lol.Plus if properly installed you will noticed better sound from the after market stuff as long as you get brand name equipment.Go to a well trusted audio shop in your area they should be able to see if it is a speaker or amp problem if your fuses are all good.They should be able to test the impedance of the speakers at the amp for you and see what is going on.

Hi
It sounds like it would more than likely be a short from some where within the wires probably a speaker wire try turning the radio of then on whilst the ignition is on. Then turn the radio back up again.
Regards Craig

you have many problems in one question.
Let's start with
1. BACK UP Warning is it the backup lights not working.
2. When you open the driver's door does the inside lights turn on
maybe the system doesn't know the door is open or the little switch inside the steering column is open circuit.
3. Maybe the speaker itself defects or wiring touching metal ground
many questions that I cannot answer without more infos
hope it helps

If it has a premium sound system some of them have a small amplifier for the over all system and the rear out put may have lost signal out put power.If it does not have an amplifier then I would replace the head unit(deck)with a brand that you like so you have total control,and no that does not sound right.Hope this helps

I would check the amp first, especially if you have very low sound on the speakers. Before amps were made, bad output transistors would create the same effect.

I've had 2 cars and both been like this?? Maybe that's how they are set up?