Power and Ground Connections:
* Battery Power (Yellow): Connects to the positive terminal of the vehicle's battery.
* Ground (Black): Connects to a suitable ground point on the vehicle's chassis or dashboard.
* Switched Power (Red): Connects to a switched power source that provides power when the ignition is turned on. This wire typically comes from the fuse box or ignition switch.
Speaker Connections:
* Front Left Speaker Positive (Green/White): Connects to the positive terminal of the front left speaker.
* Front Left Speaker Negative (Green/Black): Connects to the negative terminal of the front left speaker.
* Front Right Speaker Positive (Violet/White): Connects to the positive terminal of the front right speaker.
* Front Right Speaker Negative (Violet/Black): Connects to the negative terminal of the front right speaker.
* Rear Left Speaker Positive (Brown/White): Connects to the positive terminal of the rear left speaker.
* Rear Left Speaker Negative (Brown/Black): Connects to the negative terminal of the rear left speaker.
* Rear Right Speaker Positive (Blue/White): Connects to the positive terminal of the rear right speaker.
* Rear Right Speaker Negative (Blue/Black): Connects to the negative terminal of the rear right speaker.
Antenna Connection:
* Antenna (Blue/White): Connects to the vehicle's radio antenna.
Illumination:
* Illumination (Orange/Black): Connects to a power source that provides power when the vehicle's headlights are turned on.
Remote Control:
* Remote Control (Orange): Optional wire for connecting to an external remote control unit.
Fader/Balance:
* Fader (Light Blue/Black): Optional wire for controlling fade of audio between front and rear speakers.
* Balance (Cyan/Black): Optional wire for controlling balance of audio between left and right speakers.
Signal Input/Output (AUX/CD):
* Front Auxiliary Input Left (Shield): Optional RCA jack for connecting an external device for audio playback (e.g., MP3 player).
* Front Auxiliary Input Right (Yellow): Optional RCA jack for connecting an external device for audio playback (e.g., MP3 player).
* CD Changer Input Left (Red): Optional RCA input jack for connecting an external CD changer.
* CD Changer Input Left (White): Optional RCA output jack for connecting an external CD changer.
Please note that this diagram is specific to the 2003 Olds Alero and may not be applicable to other models or trim levels. It is recommended to consult a professional or refer to the vehicle's owner's manual for accurate and complete information.