Need to hook up a 200 pioneer stereo with wire harness from 96 honda accord to the wiring on a 64 impala

Hello my name is Israel. The following diagrams should be able to help you out. The first is for the honda and the second for the stereo. Good Luck.
Constant 12V+ Blue/White Switched 12V+ Yellow/Red Ground Black Illumination Red/Black Dimmer n/a Antenna Trigger Yellow/White Antenna Left Rear Front Speakers 6 1/2" Doors Left Front (+) Blue/Green Left Front (-) Gray/Black Right Front (+) Red/Green Right Front (-) Brown/Black Rear Speakers 6" x 9" Rear Deck Left Rear (+) Blue/Yellow Left Rear (-) Gray/White Right Rear (+) Red/Yellow Right Rear (-) Brown/White

red - 12v battery
yellow- 12 ignition
black- ground
blue/white- amp turn on
white FL+
white/black FL -
gray FR +
gray/black FR -
green RL +
green/black RL -
purple RR +
purple/black RR -

When you put the stereo in, what did you do with the red wire with a green stripe? The aftermarket radios don't always use these, so you have to wrap the ends, depending on whether or not you used a wiring harness. If that wire is shorted on the chassis, it will blow the dimmer fuse.

1995 Honda Accord Car Radio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Blue/White
Car Radio Accessory Switched 12v+ Wire: Yellow/Red
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Red/Black
Car Stereo Dimmer Wire: Red/Green
Car Stereo Antenna Trigger Wire: Yellow/White
Car Stereo Amp Trigger Wire: Violet/Red
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5 1/4?
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Blue/Green
Left Front Speaker Negative Wire (-): Gray/Black
Right Front Speaker Positive Wire (+): Red/Green
Right Front Speaker Negative Wire (-): Brown/Black
Car Audio Rear Speakers Size: 6 1/2?
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Blue/Yellow
Left Rear Speaker Negative Wire (-): Gray/White
Right Rear Speaker Positive Wire (+): Red/Yellow
Right Rear Speaker Negative Wire (-): Brown/White

hi

Car Radio Battery Constant 12v+ Wire: White/Yellow
Car Radio Accessory Switched 12v+ Wire: Yellow/Red
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Red/Black
Car Stereo Antenna Trigger Wire: Yellow/White
Left Front Speaker Positive Wire (+): Blue/Green
Left Front Speaker Negative Wire (-): Gray/Black
Right Front Speaker Positive Wire (+): Red/Green
Right Front Speaker Negative Wire (-): Brown/Black
Left Rear Speaker Positive Wire (+): Blue/Yellow
Left Rear Speaker Negative Wire (-): Gray/White
Right Rear Speaker Positive Wire (+): Red/Yellow
Right Rear Speaker Negative Wire (-): Brown/White

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Radio 12V- white/yellow
Radio Ground black
Radio Ignition yellow/red
Left Front Speaker (+/-) blue/green - gray/black
Right Front Speaker (+/-) red/green - brown/black
Left Rear Speaker (+/-) blue/yellow - gray/white
Right Rear Speaker (+/-) red/yellow - brown/white

1996 Honda Accord Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Yellow/White
Car Radio Accessory Switched 12v+ Wire: White/Red
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Red/Black
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: Yellow/White
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 5 1/4′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Blue/Green
Left Front Speaker Negative Wire (-): Gray/Black
Right Front Speaker Positive Wire (+): Red/Green
Right Front Speaker Negative Wire (-): Brown/Black
Car Audio Rear Speakers Size: 6 1/2′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Blue/Yellow
Left Rear Speaker Negative Wire (-): Gray/White
Right Rear Speaker Positive Wire (+): Red/Yellow
Right Rear Speaker Negative Wire (-): Brown/White

Below is the wiring setup for your car:

1990-93 Honda Accord Stereo Wiring
Constant 12V+ White/Yellow Switched 12V+ Yellow/Red Ground Black Illumination Red/Black Dimmer n/a Antenna Trigger Yellow/White Antenna Left Rear Front Speakers 6 1/2" Doors Left Front (+) Blue/Green Left Front (-) Gray/Black Right Front (+) Red/Green Right Front (-) Brown/Black Rear Speakers 6 1/2" Rear Deck Left Rear (+) Blue/Yellow Left Rear (-) Gray/White Right Rear (+) Red/Yellow Right Rear (-) Brown/White Best of luck,
Greg

1995 Honda Accord Stereo Wiring Constant 12V+ Blue/White Switched 12V+ Yellow/Red Ground Black Illumination Red/Black Dimmer n/a Antenna Trigger Yellow/White Antenna Left Rear Front Speakers 5 1/4" Doors Left Front (+) Blue/Green Left Front (-) Gray/Black Right Front (+) Red/Green Right Front (-) Brown/Black Rear Speakers 6 1/2" Rear Door Left Rear (+) Blue/Yellow Left Rear (-) Gray/White Right Rear (+) Red/Yellow Right Rear (-) 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

Battery BLUE/WHITE (+) RADIO HARNESS
Accesory YELLOW/RED (+) RADIO HARNESS
Ground BLACK (-) RADIO HARNESS
Illumination RED/BLACK (+) RADIO HARNESS
Power Antenna YELLOW/WHITE (+) RADIO HARNESS
LF Speaker (+) BLUE/GREEN
LF Speaker (-) GRAY/BLACK
RF Speaker (+) RED/GREEN
RF Speaker (-) BROWN/BLACK
LR Speaker (+) BLUE/YELLOW
LR Speaker (-) GRAY/WHITE
RR Speaker (+) RED/YELLOW
RR Speaker (-) BROWN/WHITE
Steering Cntrls NO
Speed Cntrl NO
Radio Security YES