I just bought my first 240sx. I have a 89' 240sx coupe. The previous owner cut the factory connecter. So I had a stock 99-02 infiniti G20 headunit laying around. So I went to the junkyard and cut off the pig tails for the g20 radio and I wired it up to the wires on the s13.
Wire diagram
___________________S13 wires=======G20 wires____________________________
Constant 12V+~~~~~~Red/Black========Red/Green
Switched 12V+~~~~~~Blue=============Green/White
Ground chassis~~~~~=================Grey/Blue
Illumination~~~~~~~~Red/Blue=========Blue
Dimmer~~~~~~~~~~~Red/Yellow========Red/Yellow
Antenna trigger~~~~Black/Red========Red
Amp trigger~~~~~~~Lt Green/Red=====Lt Green/Red
Front speakers:
Left front (+)~~~~~~Blue/White========Pink
Left front (-)~~~~~~Blue/Yellow========Blue
Right front (+)~~~~~Brown============Violet
Right front (-)~~~~~Brown/White=======Light Green
Rear speaker:
Left rear (+)~~~~~~~Red============Yellow
Left rear (-)~~~~~~~Green===========Brown
Right rear (+)~~~~~~Blue============Red
Right rear (-)~~~~~~Pink============Green
Back of headunit
Headunit installed
99-02 Infiniti G20.Adapter connectors i will be using when i install aftermarket radio
