After battery change, the AirCon and the music system don't turn on. on 1996 Toyota Camry

A/C and music system stopped working after battery change. I can't find the security code in the manual.This is a used car and I don't know if any code was set by the first owner. Any pointers on how I can get the A/C and music system up?


Asked by for the 1996 Toyota Camry