What is the model number of the unit, I myself have never seen that HU, on other PCM units you press 1,4,8 but as yours only has 1 through 6 I doubt that would help ;-)
I don't see how a dead battery would affect power to the HU, I know on other OEM HU with power loss requires putting in the activation code again but in that case you still had power.
Is there a fuse on your amplifier maybe that has blown also?
-cheers
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