that depends on what kind of car you are working on. For most cars they can be removed by "popping off" the grille with a small flat head screw driver and removing the 2 or 4 screws that hold it in place. but for cars with speakers in the doors you must remove the door panel. For more detailed instructions email me at bones13579@gmail.com
Car Radio Constant 12v+ Wire: White/Green Car Radio Switched 12v+ Wire: Yellow/Red Car Radio Ground Wire: Black Car Radio Illumination Wire: Red/Black Car Stereo Dimmer Wire: Red 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 (+): Green/Black Left Front Speaker Negative Wire (-): Light Green Right Front Speaker Positive Wire (+): Green/Yellow Right Front Speaker Negative Wire (-): Gray/Red Rear Speakers Size: N/A Rear Speakers Location: N/A Left Rear Speaker Positive Wire (+): Blue/White Left Rear Speaker Negative Wire (-): Blue/Black Right Rear Speaker Positive Wire (+): Pink Right Rear Speaker Negative Wire (-): Blue/Yellow
Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Green Radio Dimmer Wire: N/A Radio Antenna Trigger Wire: Black/Red Radio Amp Trigger Wire: None 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″ x 9″ 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
1997 Toyota Tercel Car Stereo Radio Wiring Diagram Radio Constant 12V+ Wire: Blue/YellowRadio Switched 12V+ Wire: GrayRadio Ground Wire: BrownRadio Illumination Wire: GreenRadio Dimmer Wire: N/ARadio Power Antenna Trigger Wire: Black/RedRadio Amplifier Turn On Trigger Wire: N/AFront Speakers Size: 4″Front Speakers Location: DoorsLeft Front Speaker Wire (+): PinkLeft Front Speaker Wire (-): PurpleRight Front Speaker Wire (+): Light GreenRight Front Speaker Wire (-): BlueRear Speakers Size: 6 1/2″Rear Speakers Location: Side PanelsLeft Rear Speaker Wire (+): BlackLeft Rear Speaker Wire (-): YellowRight Rear Speaker Wire (+): RedRight Rear Speaker Wire (-): White
For the 1998 Chevy S10 pickup the radio constant 12V+ wire is orange. The radio switched 12V+ wire is yellow. The radio ground wire is black, the illumination wire is gray. The left front speaker wire + is tan, the left front speaker wire - is gray, right front wire + is light green, right front wire - is dark green. The left rear speaker wire + is brown, left rear wire - is yellow, right rear wire + is dark blue, and right rear wire - is light blue.
Constant 12V+ Wire: Light Green Ignition Switched 12V+ Wire: Black/Yellow Ground Wire: Black Illumination Wire: Blue/Yellow Dimmer Wire: N/A Left Front Speaker Wire (+): Green Left Front Speaker Wire (-): Blue/Red Right Front Speaker Wire (+): Light Green/Yellow Right Front Speaker Wire (-): Black/Green Left Rear Speaker Wire (+): Green/Yellow Left Rear Speaker Wire (-): Blue/Orange Right Rear Speaker Wire (+): Green/White Right Rear Speaker Wire (-): Green/Blue
Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Green Radio Dimmer Wire: N/A Radio Antenna Trigger Wire: Black/Red Radio Amp Trigger Wire: None 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
Radio Constant 12V+ Wire: Yellow/White Radio Switched 12V+ Wire: White/Red Radio Ground Wire: Black Radio Illumination Wire: Red/Black Radio Dimmer Wire: n/a Radio Antenna Trigger Wire: Yellow/White Radio Antenna Location: Left Rear Front Speakers Size and Location: 5 1/4? Doors Left Front Speaker Wire (+): Blue/Green Left Front Speaker Wire (-): Gray/Black Right Front Speaker Wire (+): Red/Green Right Front Speaker Wire (-): Brown/Black Rear Speakers Size and Location: 6 1/2? Rear Deck Left Rear Speaker Wire (+): Blue/Yellow Left Rear Speaker Wire (-): Gray/White Right Rear Speaker Wire (+): Red/Yellow Right Rear Speaker Wire (-): Brown/White
Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Green Radio Dimmer Wire: N/A Radio Antenna Trigger Wire: Black/Red Radio Amp Trigger Wire: None 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″ x 9″ 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
In a 1994 Corolla, the radio battery constant 12v+ wire is blue/yellow, the radio accessory switched 12v+ wire is gray, the ground wire is brown, and the illumination wire is green. For the front speakers, the left front speaker wire (+) is pink, the left front speaker wire (-) is violet, the right front speaker wire (+) is light green, and the right front speaker wire (-) is blue. For the rear speakers, the left rear speaker wire (+) is black, the left rear speaker wire (-) is yellow, the right rear speaker wire (+) is red, and the right rear speaker wire (-) is white.
Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Green Radio Dimmer Wire: N/A Radio Antenna Trigger Wire: Black/Red Radio Amp Trigger Wire: None 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″ x 9″ 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
Radio Constant 12V+ Wire: White/Green Radio Switched 12V+ Wire: White/Red Radio Ground Wire: Black Radio Illumination Wire: n/a Radio Dimmer Wire: Red/Black Radio Antenna Trigger Wire: n/a Radio Antenna Location: Rear Glass Front Speakers Size and Location: 6 1/2? Doors Left Front Speaker Wire (+): Blue/Green Left Front Speaker Wire (-): Gray/Black Right Front Speaker Wire (+): Red/Green Right Front Speaker Wire (-): Brown/Black Rear Speakers Size and Location: 6? x 9? Rear Deck Left Rear Speaker Wire (+): Blue/Yellow Left Rear Speaker Wire (-): Gray/White Right Rear Speaker Wire (+): Red/Yellow Right Rear Speaker Wire (-): Brown/White
Radio Constant 12V+ Wire: White/Green Radio Switched 12V+ Wire: White/Red Radio Ground Wire: Black Radio Illumination Wire: n/a Radio Dimmer Wire: Red/Black Radio Antenna Trigger Wire: n/a Radio Antenna Location: Rear Glass Front Speakers Size and Location: 6 1/2? Doors Left Front Speaker Wire (+): Blue/Green Left Front Speaker Wire (-): Gray/Black Right Front Speaker Wire (+): Red/Green Right Front Speaker Wire (-): Brown/Black Rear Speakers Size and Location: 6? x 9? Rear Deck Left Rear Speaker Wire (+): Blue/Yellow Left Rear Speaker Wire (-): Gray/White Right Rear Speaker Wire (+): Red/Yellow Right Rear Speaker Wire (-): Brown/White
Radio Constant 12V+ Wire: Yellow/White Radio Switched 12V+ Wire: White/Red Radio Ground Wire: Black Radio Illumination Wire: Red/Black Radio Dimmer Wire: n/a Radio Antenna Trigger Wire: Yellow/White Radio Antenna Location: Left Rear Front Speakers Size and Location: 5 1/4″ Doors Left Front Speaker Wire (+): Blue/Green Left Front Speaker Wire (-): Gray/Black Right Front Speaker Wire (+): Red/Green Right Front Speaker Wire (-): Brown/Black Rear Speakers Size and Location: 6 1/2″ Rear Deck Left Rear Speaker Wire (+): Blue/Yellow Left Rear Speaker Wire (-): Gray/White Right Rear Speaker Wire (+): Red/Yellow Right Rear Speaker Wire (-): Brown/White
This might work http://www.modifiedlife.com/car-stereo-radio-wiring-diagram-1988-honda-civic/ Radio Constant 12V+ Wire: White/Blue Radio Switched Ignition 12V+ Wire: Yellow/Red Radio Ground Wire: Black Radio Illumination Dimmer Wire: Red/Black Radio Antenna Trigger Wire: N/A Radio Amplifier Turn On Wire: N/A Front Speaker Size: N/A Front Speaker Location: N/A Left Front Speaker Wire (+): Blue/Green Left Front Speaker Wire (-): Gray/Black Right Front Speaker Wire (+): Red/Green Right Front Speaker Wire (-): Brown/Black Rear Speaker Size: N/A Rear Speaker Location: N/A Left Rear Speaker Wire (+): Blue/Yellow Left Rear Speaker Wire (-): Gray/White Right Rear Speaker Wire (+): Red/Yellow Right Rear Speaker Wire (-): Brown/White
Radio Constant 12V+ Wire: White/Green Radio Ignition Switched 12V+ Wire: White/Red Radio Ground Wire: Black Radio Illumination Dimmer Wire: Red/Black Radio Antenna Trigger Wire: N/A Radio Amplifier Trigger Wire: N/A Front Speakers Size: N/A Front Speakers Location: N/A Left Front Speaker Wire (+): Blue/Green Left Front Speaker Wire (-): Gray/Black Right Front Speaker Wire (+): Red/Green Right Front Speaker Wire (-): Brown/Black Rear Speakers Size: N/A Rear Speakers Location: N/A Left Rear Speaker Wire (+): Blue/Yellow Left Rear Speaker Wire (-): Gray/White Right Rear Speaker Wire (+): Red/Yellow Right Rear Speaker Wire (-): Brown/White
Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Dark Green Dimmer Wire: White/Green Antenna Trigger Wire: None Front Speaker Size: 6 1/2″ Front Speaker Location: Doors Left Front Speaker Wire (+): Pink Left Front Speaker Wire (-): Purple Right Front Speaker Wire (+): Green Right Front Speaker Wire (-): Blue Rear Speaker Size: 6″ x 9″ Rear Speaker Location: Rear Deck Left Rear Speaker Wire (+): Black Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Red Right Rear Speaker Wire (-): White
Radio Constant 12V+ Wire: Orange Radio Ignition Switched 12V+ Wire: Yellow Radio Ground Wire: Black Radio Illumination Wire: Gray Radio Dimmer Wire: Brown Radio Antenna Trigger Wire: N/A Radio Amplifier Trigger Wire: N/A Front Speakers Size: 6 1/2″ Front Speakers Location: Doors Left Front Speaker Wire (+): Tan Left Front Speaker Wire (-): Gray Right Front Speaker Wire (+): Light Green Right Front Speaker Wire (-): Dark Green Rear Speakers Size: 6 1/2″ Rear Speakers Location: Rear Doors Left Rear Speaker Wire (+): Brown Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Dark Blue Right Rear Speaker Wire (-): Light Blue