You are sending TOO much power to the speakers, Replace the speakers and then get a much smaller amp that is within the ratings of the speakers. ACTUALLY you should get an amp that is aboout 1/2 the total rating of the speakers.
You should ALSO procure a sound meter to verify the sound level is within safe limits. If you insist upon abusing your ears with too high a sound pressure, be ready to buy hearing aids at a VERY young age.
You also need to know that the enclosure of the speaker plays a part in keeping the speaker from tearing itself to pieces.
MANY of the auto sound system installers are hacks that don't do it right and you see what happens to your expensive equipment!
Using even a Radio Shack sound meter properly will protect your preciuos hearing for later life.
If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following. I'll assume that you've checked the amplifier's on-board fuses.
With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.
Disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it remains in protect mode, the amp almost certainly has shorted output transistors and will need to be repaired.
The radio code is a security feature that's meant to deter theft, and it's unique to each vehicle. If you've lost your code, you'll need to contact a Nissan dealership or service center and provide proof of ownership. They should be able to help you retrieve the code. Please do not attempt to use codes from the internet as incorrect attempts may lock your radio.
Unfortunately, no one knows or is telling. Companies rarely state power in RMS because Peak Power is a much more impressive. 1000 watt amp, 200 watts RMS x 2 channels at 8 ohms. Look for a sticker on the unit.
https://www.google.com/search?q=Xplore+Amp+5553
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'year make model' of the vehicle is needed in questions like this please?
Modern vehicle radios are controlled by the Body control Module (BCM) and are used for broadcasting warning beeps and indicator clickers. The beeps an be as innocuous as "do you know your radio is still on"? It can also be caused by your cellphone pinging local transmitters and receiving a confirmation back, or checking in for emails.
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Aug 26, 2010 - What causes a beeping noise to come over the radio speakers? How can it be made to stop? - Answered by a verified Mercedes Mechanic.
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If this is with an analogue signal; FM/AM, check the aerial amplifier is working properly. Sometimes the rear windscreen heater is used as the aerial with an RF amplifier in series with the aerial lead.
No power means no/poor signal.
