I have been going through forums trying to see what the problem is, but i really cant find the answer. I have an aftermarket head unit installed, but i had it installed at bestbuy over a year ago. Recently i was messing around with the dome light, trying to replace the original bulb with LEDs. I saw a little spark, then the LEDs stopped working. I put the original bulb back in, and it still didnt work. I then noticed that neither my radio or my keyless entry system was working. If i have the car on, i can use the power locks, but if the car is off, nothing works. I checked the fuse, nothing looks bad. Any pointers? BTW I have a 08 fit sport, if that is of any use...

 

I think I have done this before, it was the "backup" fuse in the panel.

 

Check FS8 10Amps fuse in under hood fuse box.

Found my old post:
https://www.fitfreak.net/forums/1st-...oblem-gd3.html

 

Not sure if it's the same on earlier models, but on a 2009, it's almost definitely the "Backup Fuse", which is the top left corner one in the orange clip on the fusebox under the steering wheel. Mine popped during my maplight installation, and gave me the same symptoms: no lights, no radio, no door locks.

Found the answer here from helpful forum members.

 

Thanks for this post, just had a similar issue and it was the back-up fuse 10A in the engine bay fuse box.

 

Sorry to revive, but did you ever get this sorted out? I just bought a used 2008 5spd Fit (got a crazy deal on it) and it seems to have this issue... also, the OBD2 port has no power either (I'm guessing it's all connected).
All the fuses look good (I checked every single one of them). I'm fairly handy (I've done timing belts and valve jobs on B-series Integras, full suspension mods, clutch replacement, etc) but am stumped. I need to get the car inspected for title transfer soon.

Thanks. Looking forward to the fun journeys ahead.