I personally would take it to a stereo shop, those guys know. There's too many wires now adays, too easy to mess your current system up. But if you must, make sure you're up on your color codes. Thank goodness for the computer.
yes
join it
what year?
You can use the 1990 stereo in your 1992 Accord, but the 1998 will not bolt in the correct way.
http://www.installdr.com/InstallDocs/Honda/PDF/466021.pdf
WE DON'T KNOW!
http://www.modifiedlife.com/ schematics for numerous makes/models including 95 Honda passport
remove and replace.
Replace Thermostat
How do you add freon to a 1999 Honda Passport
Over 5000$
Take it to a stereo shop, even those guys says its a bugger to get them out so its best left to a pro