The illumination wire on a car stereo is meant for the brightness on the display. It is used to adjust the brightness of the display for seeing it during night hours.
2 to each speaker, 1 ground, 1 keyed power, 1 illumination or memory.
check the wiring connections as it sounds to me that the illumination wire is getting a constant 12v feed, also check that the ignition wire is switching off with the ignition
Ford Taurus Car Stereo Radio Wiring Diagram Radio Constant 12V+ Wire: Green/Yellow Radio Ignition SwitchFord Taurus Car Stereo Radio Wiring Diagram Radio Constant 12V+ Wire: Green/Yellow Radio Ignition Switched 12V+ Wire: Yellow/Black Radio Ground Wire: Black/Light Green Radio Illumination ...Dimmer Wire: Light Blue/Red Radio Antenna Trigger Wire: Orange/Blue Radio Amplifier Trigger Wire: ...ed 12V+ Wire: Yellow/Black Radio Ground Wire: Black/Light Green Radio Illumination ...Dimmer Wire: Light Blue/Red Radio Antenna Trigger Wire: Orange/Blue Radio Amplifier Trigger Wire: ...
Car Radio Constant 12V+ Wire: Blue/Yellow Car Radio Ignition Switched 12V+ Wire: Gray Car Radio Ground Wire: Brown Car Stereo Illumination Wire: Green Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: Black/Red Car Stereo Amplifier Trigger Wire: N/A Front Speakers Size: 5 1/4″ Front Speakers Location: Doors Left Front Speaker Wire (+): Pink Left Front Speaker Wire (-): Purple Right Front Speaker Wire (+): Light Green Right Front Speaker Wire (-): Blue Rear Speakers Size: 6 1/2″ Rear Speakers Location: Rear Deck Left Rear Speaker Wire (+): Black Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Red Right Rear Speaker Wire (-): White
Car Radio Constant 12V+ Wire: Blue/Yellow Car Radio Ignition Switched 12V+ Wire: Gray Car Radio Ground Wire: Brown Car Stereo Illumination Wire: Green Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: Black/Red Car Stereo Amplifier Trigger Wire: N/A Front Speakers Size: 5 1/4″ Front Speakers Location: Doors Left Front Speaker Wire (+): Pink Left Front Speaker Wire (-): Purple Right Front Speaker Wire (+): Light Green Right Front Speaker Wire (-): Blue Rear Speakers Size: 6 1/2″ Rear Speakers Location: Rear Deck Left Rear Speaker Wire (+): Black Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Red Right Rear Speaker Wire (-): White
Car Radio Battery Constant 12v+ Wire: Blue/White Car Radio Accessory Switched 12v+ Wire: Gray Car Radio Ground Wire: Brown Car Radio Illumination Wire: Green Car Stereo Dimmer Wire: White/Black Car Stereo Antenna Trigger Wire: Black Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Pink Left Front Speaker Negative Wire (-): Violet Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Blue Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Black Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Red Right Rear Speaker Negative Wire (-): White
your ground wire for the stereo is connected to the ignition wire of the car
Car Radio Constant 12V+ Wire: Blue/Yellow Car Radio Ignition Switched 12V+ Wire: Gray Car Radio Ground Wire: Brown Car Stereo Illumination Wire: Green Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: Black/Red Car Stereo Amplifier Trigger Wire: N/A Front Speakers Size: 5 1/4? Front Speakers Location: Doors Left Front Speaker Wire (+): Pink Left Front Speaker Wire (-): Purple Right Front Speaker Wire (+): Light Green Right Front Speaker Wire (-): Blue Rear Speakers Size: 6 1/2? Rear Speakers Location: Rear Deck Left Rear Speaker Wire (+): Black Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Red Right Rear Speaker Wire (-): White Notes: If equipped, the amplifier is under the passenger seat.
Car Radio Constant 12v+ Wire: Blue/Yellow Car Radio Switched 12v+ Wire: Gray Car Radio Ground Wire: Brown Car Radio Illumination Wire: Green Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger: Black/Red Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Pink Left Front Speaker Negative Wire (-): Violet Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Blue Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Black Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Red Right Rear Speaker Negative Wire (-): White
Car Radio Constant 12v+ Wire: Blue/Yellow Car Radio Switched 12v+ Wire: Gray Car Radio Ground Wire: Brown Car Radio Illumination Wire: Green Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger: N/A Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Pink Left Front Speaker Negative Wire (-): Violet Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Blue Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Black Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Red Right Rear Speaker Negative Wire (-): White
Car Radio Battery Constant 12v+ Wire: Orange Car Radio Accessory Switched 12v+ Wire: Yellow Car Radio Ground Wire: Black Car Radio Illumination Wire: Brown Car Stereo Dimmer Wire: Gray Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: Dash Left Front Speaker Positive Wire (+): Tan Left Front Speaker Negative Wire (-): Gray Right Front Speaker Positive Wire (+): Light Green Right Front Speaker Negative Wire (-): Dark Green Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: Rear Deck Left Rear Speaker Positive Wire (+): Brown Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Dark Blue Right Rear Speaker Negative Wire (-): Light Blue
Honda fit 2009 Car Radio Battery Constant 12v+ Wire: Pink Car Radio Accessory Switched 12v+ Wire: Orange Car Radio Ground Wire: Black Car Radio Illumination Wire: Gray Car Stereo Dimmer Wire: Red Car Stereo Antenna Trigger Wire: Black Car Stereo Amp Trigger Wire: N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: N/A Car Audio Front Speakers Location: N/A Left Front Speaker Positive Wire (+): Light Blue Left Front Speaker Negative Wire (-): Light Green Right Front Speaker Positive Wire (+): Brown Right Front Speaker Negative Wire (-): Red Car Audio Rear Speakers Size: N/A Car Audio Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Gray Left Rear Speaker Negative Wire (-): Brown Right Rear Speaker Positive Wire (+): Blue Right Rear Speaker Negative Wire (-): Orange