If you have no radio does the ground and illumination wires need to be connected to anything

1997 Mercury Villager Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Green/Purple
Radio Ignition Switched 12V+ Wire: Yellow/Black
Radio Ground Wire: Black/Light Green
Radio Illumination Wire: Green
Left Front Speaker Wire (+): Orange/Light Green
Left Front Speaker Wire (-): Light Blue/White
Right Front Speaker Wire (+): White/Light Green
Right Front Speaker Wire (-): Dark Green/Orange
Left Rear Speaker Wire (+): Light Brown/White
Left Rear Speaker Wire (-): Light Brown/Yellow
Right Rear Speaker Wire (+): Light Brown/Green
Right Rear Speaker Wire (-): Brown/Pink

2003 Hyundai Accent Car Radio Stereo Wiring Diagram
Car Radio Constant 12v+ Wire: Orange/Black
Car Radio Switched 12v+ Wire: Pink
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Green/Orange
Car Stereo Dimmer Wire: Green/Black
Left Front Speaker Positive Wire (+): Red
Left Front Speaker Negative Wire (-): Blue
Right Front Speaker Positive Wire (+): White
Right Front Speaker Negative Wire (-): Brown
Left Rear Speaker Positive Wire (+): Green
Left Rear Speaker Negative Wire (-): Orange
Right Rear Speaker Positive Wire (+): Orange/Blue
Right Rear Speaker Negative Wire (-): Black/White

hope this helps
Radio Battery Constant 12v+ Wire: Green/Yellow
Radio Accessory Switched 12v+ Wire: Yellow/Black
Radio Ground Wire: Black/Light Green
Radio Illumination Wire: Blue/Red
Stereo Antenna Trigger Wire: Orange/Blue
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange

Car Radio Battery Constant 12v+ Wire: Green/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Black
Car Radio Ground Wire: Red or Black
Car Radio Illumination Wire: Blue/Red
Car Stereo Dimmer Wire: Orange/Black
Left Front Speaker Positive Wire (+): Orange/Green
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): White/Green
Right Front Speaker Negative Wire (-): Black/White
Left Rear Speaker Positive Wire (+): Pink/Green
Left Rear Speaker Negative Wire (-): Pink/Blue
Right Rear Speaker Positive Wire (+): Pink/Blue
Right Rear Speaker Negative Wire (-): Green/Orange

ITEM - WIRE COLOR - POLARITY - WIRE LOCATION
12V - red - POSITIVE - ignition harness
STARTER - white - POSITIVE - ignition harness
IGNITION - red - POSITIVE - ignition harness
ACCESSORY - red - POSITIVE - ignition harness
SECOND ACCESSORY - yellow - POSITIVE - ignition harness
BRAKE WIRE - white - POSITIVE - brake pedal switch
RADIO 12V - red - POSITIVE - radio
RADIO GROUND - black - NEGATIVE - radio
RADIO SWITCH - yellow - POSITIVE - radio
RADIO ILLUMINATE - pink - POSITIVE - radio
POWER ANTENNA - gray/orange - POSITIVE - radio
LF SPEAKER - white - brown - radio
RF SPEAKER - green - orange - radio
LR SPEAKER - yellow - black - radio
RR SPEAKER - orange - blue - radio

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1998 Chevrolet Malibu Car Stereo Wiring Diagram

Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4? x 6?
Car Audio Front Speakers Location: Doors
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: 6? x 9?
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

Hope this helps (remember to rate this).

this is what I show for Passat.
Car Radio Constant 12V+ Wire: Red/White
Car Radio Ignition Switched 12V+ Wire: Orange
Car Radio Ground Wire: Brown
Car Stereo Illumination Wire: Gray/Blue
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amplifier Trigger Wire: N/A
Front Speakers Size: 6 1/2′
Front Speakers Location: Doors
Left Front Speaker Wire (+): Blue/Black
Left Front Speaker Wire (-): Orange/Black
Right Front Speaker Wire (+): Red/White
Right Front Speaker Wire (-): Orange/White
Rear Speakers Size: 6 1/2′
Rear Speakers Location: Rear Door
Left Rear Speaker Wire (+): Red/Light Green
Left Rear Speaker Wire (-): Orange/Black
Right Rear Speaker Wire (+): Blue/Light Green
Right Rear Speaker Wire (-): Orange/Red

Constant 12V+ Brown/White
Switched 12V+ Orange
Ground Black/Light Green
Illumination Pink/Black
Dimmer Pink
Front Speakers 5" x 7" Doors
Left Front (+) Gray/Blue
Left Front (-) Yellow/Blue
Right Front (+) Blue
Right Front (-) Yellow
Rear Speakers 5" x 7" Side Panels

Left Rear (+) Blue/White
Left Rear (-) Blue/White
Right Rear (+) Blue/Black
Right Rear (-) Red/Blue

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here are the factory wire colors and what they do.

1999 Ford Escort
Radio Stereo Audio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Blue/Red
Car Radio Accessory Switched 12v+ Wire: Blue/Black
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Red/Black
Car Stereo Dimmer Wire: Green
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: White/Orange
Car Stereo Amplifier Location: Under the driver seat.
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Violet
Left Front Speaker Negative Wire (-): Blue/Orange
Right Front Speaker Positive Wire (+): Blue/White
Right Front Speaker Negative Wire (-): White
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): White/Blue
Left Rear Speaker Negative Wire (-): Red/Blue
Right Rear Speaker Positive Wire (+): White/Green
Right Rear Speaker Negative Wire (-): Blue
-->

Constant 12V+ Black/Yellow
Switched 12V+ Red/White
Ground Black/Light Blue
Illumination Orange
Dimmer Pink
Antenna Trigger Orange/Red
Antenna Right Rear
Front Speakers 4" Doors
Left Front (+) Dark Green
Left Front (-) Brown/Red
Right Front (+) Purple
Right Front (-) Dark Blue/Red
Rear Speakers 6" x 9" Rear Deck
Left Rear (+) Brown/Yellow
Left Rear (-) Brown/Light Blue
Right Rear (+) Dark Blue/White
Right Rear (-) Dark Blue/Orange