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Most, if not all cars will shut off accessory power when cranking so that the starter has plenty of current. If your stereo doesn't come back on again once the car is running, that's a different story... is it a cheap and nasty unit?
Have you checked all the connections, especially the "remote" turn on from the stereo? This wire is usually a small gauge "blue" wire coming from your head unit. When you turn on the head unit it will remotely power on the amp.
Well you can please follow the below steps - 1. Disconnect your car battery. It is vitally important to your safety that you never work on any type of electronic in your car with the battery still connected, as this puts you at risk for electrocution. 2. Remove the old stereo by taking off all the dashboard panels surrounding your stereo, sliding out your old stereo head unit, and unplugging all the wires that are connected to the head unit. Discard the old stereo. 3. Take your Pioneer car stereo head unit and plug each of the positive wires from your car speakers to the positive terminals on the head unit. Take all of the negative speaker wires and connect them to the negative terminals on the head unit. 4. Attach the stereo's black ground wire to a metal bolt or screw located near where the stereo is mounted in the dash. 5. Connect all of the ignition power wires to your Pioneer stereo. 6. Take the harness connector and plug it into your car stereo. Now plug the antenna into the back of your head unit. 7. Slide the stereo back into the dash, screw it in place, and replace the dashboard pieces you removed earlier. 8. Reconnect your car battery, turn the car on and test out your new Pioneer car stereo. Please post comments for more help or information..........
if the radio completely shut off chances are that there is lose connection somewhere. If the radi0 (head unit) will not turn off take out the radio and check to make sure there is a secure connection on the yellow and red wires. Also check to make sure a fuse was not blown due to a short.
If an amp will not turn on check the blue or blue/white wire for a secure connection and also check the connections at the amp. Ensure none of the power connections to the amp have come loose.
I would suspect that the cooling fan relay ( in a relay / fuse box under the hood) is stuck. There are 2, a high and low speed relay. Pull one and see if the fan goes off. Once you have identified the culprit, see if there is an identical relay in another location that you can swap into place to verify the problem is fixed.