What is the color codes for a stereo in a 1991 nissan sentra se?

2002 Nissan Sentra Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Pink
Car Radio Switched 12v+ Wire: Blue
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Red/Green
Car Stereo Dimmer Wire: Red/Yellow
Left Front Speaker Positive Wire (+): Pink
Left Front Speaker Negative Wire (-): Blue
Right Front Speaker Positive Wire (+): White
Right Front Speaker Negative Wire (-): Black
Left Rear Speaker Positive Wire (+): Light Green
Left Rear Speaker Negative Wire (-): Violet
Right Rear Speaker Positive Wire (+): Blue
Right Rear Speaker Negative Wire (-): Pink

At he air cleaner box/

there is a big difference

98 Sentra Stereo Wiring Diagram

if u have a local autozone they have a radio harness kit its around 8 dollars it has all the color code u need tells wire color and which wire goes where saves lots of guessing and trouble

Most cases you'll need a scanner to do this.
Most autoparts stores will do this for you for free. Places like Autozone or Kragen Autoparts.

I have the same car...04 nissan sentra....with the exact same problem....left side speakers just quit working. I still do not know what caused the problem, or how to fix it. I know it not the wiring, it is a defect within the stereo.

1995 Nissan Sentra Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Pink
Car Radio Switched 12v+ Wire: Blue
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Red/Blue
Car Stereo Dimmer Wire: Red/Yellow
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Pink
Left Front Speaker Negative Wire (-): Blue
Right Front Speaker Positive Wire (+): White
Right Front Speaker Negative Wire (-): Black
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Light Green
Left Rear Speaker Negative Wire (-): Violet
Right Rear Speaker Positive Wire (+): Blue
Right Rear Speaker Negative Wire (-): Pink

go to crutchfield .com and let them know your car and your stereo. they are great at this.

radiador