if ur using the iso connector it might be that all the wires aint the same as the headunit ur using
as i discovered but try checking that all the hu wiring loom is same as the iso connector block and swap pins if nessary
but i dont think its what stew was sayin tho as i "think" hes on about the code to get the stereo working on a std nissan thing but if ur using an iso connector it probably isnt a std hu