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Most aftermarket radios are easy to pull out. There are two small metal slots on either side and you must insert a pair of "keys" in them that are used to pull them. Places like Pep Boys have these keys, the last time that I checked. So the connectors on the back can be checked after you pull the radio outwards.
Check all the fuses in the fuse box.
With the OEM radio, if you want to postpone diassembly the interior panels, the only think I can think of doing is to check the voltage across the terminals of the fuse box with a voltmeter. I have never tried to do this with a meter. We are talking about the fuses in the box that is to the front and left of the drivers left shin, right? That is a cramped place to work.
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