If the sub is still working, then it's probably just a disconnection somewhere between the LOC and the deck speakers. If the sub stopped working along with the deck speakers, then you'll need to troubleshoot the head unit's outputs. A good first step would be to remove the LOC and wire the deck speakers like they were originally to see if they start working. If not, wire up a working speaker directly to the head unit's rear speaker outputs - if the speaker works, then the issue is somewhere in the wiring going back to the rear/subs. If even a new speaker doesn't work, there might be in issue with the head unit's amplifier circuit which would likely need professional repair. Worst case scenario is wiring up the LOC accidentally shorted out the speaker wires and damaged the head unit.
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