What does Rem mean on 12v power input?

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I can't upload a photo of this, my computer is playing up. This vintage Korean 12v car amp has 3 inputs at the SMP power input. (Ground, Rem, B+) in that order. Is the Rem for a remote? Just checking to make sure because I've never worked on one of these before. Does the Remote connect to the radio/CD player to switch the car amp on because it won't turn on otherwise, the light on the front of the amp isn't turned on when 12 volts is applied? Is that what's happening here?:D
 
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