i have a 94 Pathfinder LE and had the same problem after replacing the radio. these vehicles have factory amps that power the speakers. one amp for front speakers and one amp for rear speakers. both my amps were located behind the passenger side panel in the rear cargo area and had a fuse on the side of them which were blown, after freplacing the fuses, the speakers worked great. some pathfinders had one of these amps installed behind the radio instead of both being behind the panel in the rear of the vehicle. i hope this helps.