Moxostoma

I bought a new battery for my 2010 LX. The old battery was out overnight. I installed the new battery, attached the positive cable then the negative cable. As soon as I put the negative terminal on the negative post, the engine started! There was no key in the ignition. I ran and got the key, but since it was in the "off" position, I didn't know what to do. I turned it to the first position then back, but it made no difference. I disconnected the negative terminal, but it still ran. I got back into the car to think of what to do and when I put my foot on the brake (probably a coincidence), the engine stopped. I reattached the negative terminal and this time it didn't immediately start. I started the engine with the key then turned it off. Everything OK.

What happened?

sdaidoji

iTrader: (1)

likely the same cause your battery was drained. Some short circuit somewhere

Moxostoma

My wife reminded me that the car has remote start. The remote start remote is separate from the key so it may be aftermarket. I can't find anything about it in the owner's manual. Starting must have been initiated by getting no power for a while then connecting a good battery. Seems dangerous.

Colin42

Relay in the remote start box may have been stuck on

Moxostoma

Where is the remote start box?

Did Honda offer remote start on the 2010 Civic?

Colin42

Somewhere under the dash, the wiring coming out of it wont look factory