I have a 2000 Civic LX. It had an after market radio and I'm attempting to reinstall the factory Honda radio. I have power to the radio however, two different factory Honda radios will not power up.

No enter a code message etc. The 10 amp fuse is fine and I'm getting power to the large blue factory socket which plugs directly into the radio (test light confirms this.) Any ideas????

 

Both radio fuses are intact? There's constant power and switched power in the harness...

There's a radio fuse under the hood and under the driver side dash...

 

Does it Have Constant AND accesory Power? if one is missing then it wont power on

BTW, dont use a test light. use a multimeter, it will show if there is actually 12 volts

 

Not sure if it has "Constant" power. How can I verify? I wasn't aware that there is an under the hood fuse. Is this located in the relay/fuse box?

Do you know which pin or color of wire on the wiring harness is the constant power source?

Will use a multimeter