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ORIGINAL: shawnvw

First thing you need to know is if the car has an amplifier or not. check in the trunk at the rear parcel shelf right inbetween the rear speakers. If it does have an amp, pull the connectors and check for corrosion. also need to check the integrity of the power and ground.  You can take a pair of headphones with the plug chopped off, and probe the speaker leads coming from the radio for the LF speaker, if you hear the crackling in the head phones, the noise is related to the radio, or the speaker leads coming from the radio. If no problem is found in the wires, then the radio would be suspected. If you don't hear the crackle, then you should check the wires going the the speaker. If no prblem found, then the amp would be suspected.

If there is no amp, then check the wires going to the speaker from the radio, and again, if no problem with the wires is found, then the radio would be suspected.

One other thing that I see a lot of. If the person has young kids, then the CD slot seems to be a good spot to put nickles dimes and quarters into, if this is the case, take the top off of the radio, and try to shake the money out.

Hope this helps!