I just bought my second fit, and it has some weird electrical problems going on. The car runs and drives fine but id like to address as many of these issues as i can... Some of these I knew about before I bought it others only appeared today.
So far I've noticed the following things:

Check engine light on (new today)
Power steering light on (new today but comes and goes)
Stability control light on (new today)
Airbag light on (unknown when it started)
Passenger airbag light flashes constantly
Cruise control master will engage but you can't select a speed to start it working
Remote locks dont work (known but assumed fob battery nit the case)
Power locks only work when key is in on position
Radio doesn't work at all (known issue at time of purchase)
Clock resets every time you turn off the car
Automatic lights dont work
Dome light doesn't turn on when door is opened unless key is in on position
OBD port has no power
Horn doesn't work


I've checked all the fuses and they seem to be fine so im not sure what is going on, is there a module that ties all this stuff together somewhere? Any suggestions on where to start?

 

Test the battery itself and check electrical connections and grounds to/from it.

 

New battery solved alot of problems, but I still get check engine, stability control and power steering lights. Although the obd port does work now, the only code I'm getting is p0011, im going to do an oil change today and see if that helps before going after the vtc solenoid but I don't understand why that code would also make the stability and power steering lights come on.

 

The problems that you still have are the ones that I thought the battery would correct. My guess is that you inadvertently cleaned a connection when you installed the new battery. For your remaining issues, mine have gone away when I disconnected the battery for 10 minutes. If you quickly swapped the batteries, it may not have been long enough to reset the computer.

 

usually those are the fuel injector ones?...i must admit i would have suggested a new battery also,which seems to have corrected alot of problems...does it run 100% fine?