I recently purchased a 6-disc in-dash cd player to upgrade my existing head unit. The new head unit came out of an '04 Nissan Frontier. I purchased the OEM harness for that unit, as well as the adapter harness. I installed the harnesses and everything works great except the speakers don't make any noise.

Does anybody know what is going on and how to fix my problem?

Does anybody know if this vehicle (93 240sx se) has a factory amplifier?

 

double check your wiring to the harness and to the speakers, other than that i really dont have any advice b/c im not an expert as some of the other members here, and y es it does have an amplifier, i think 3 to be exact, trunk, and 1 on each front speaker