first make sure your speaker work. use a AA battery and test them from the amp.
once your sure the speaker are OK use a multimeter and check if you got juice from the BAT. wire on each amps.
Turn on your radio and check if you got juice on each REM wire.
Doublecheck all your ground to see if they're not loose or broken.
Check the fuse on each amp + your BAT wire (under the hood)
If all this work... maybe your HU preout are dead...
