Hello Folks, this is my first time here. I acquired this car in 2014 and it's been problem-free, till just today.
The old battery finally died, so while installing the new batt, the horn starts blowing as soon as I start tightening the cable.
I feel stupid, and doubting my focus as there's been a lot of distractions here all at once.

This is a reverse polarity battery, since the posts are against the firewall, but one of the cables wouldn't reach without my cutting it's retainer, also there's a red cap on the rubber cover of what would be the negative post- positive is on the left- for the life of me, I was sure the posts were next to the firewall. The telling question ; The horn wouldn't be blowing AT ALL if the battery was backwards, right?

Now, getting past this; I have a car alarm, but it doesn't sound- just the horn. It chirped a bit while disconnecting, but it doesn't utilize the car horn.
The guy at the dealer said it must be the factory setting (alarm?) and locking and unlocking my driver door twice should cut it off. It didn't.
Further confusing is the fact there are 3 different diagrams showing the location of the fusebox online, none of which resembles mine. I have no manual.
Incidentally, this is an automatic sedan (four door).

I understand if I locate the fuse, it will disable my brakelights and horn, but the dealer said it may lock the tranny, then he told me how to unlock it on the shift lever (P,N,R,D3,D4) in a location I can't find. He said it's what tow truck drivers use to free the transmission. "Stick the key or a flat-edged screwdriver into it"... (Into WHAT?) He said it was ON the shifter- all I see there is a small recess that looks like it's holding a fastener that's on both sides of the shift stem. Others say it's "near the shifter". Can anyone please tell me exactly where this thing is?

I'm downtown in a crappy urban area, old, fixed income, but if I can get this baby to roll, I can take it to a garage 2 blks from me. I just wish I had a manual and some idea where to go from here. Any clues greatly appreciated!!!

 

The horn can sound even if it is hooked up with reverse polarity.
But, it should not be blaring unless the horn relay is stuck

Like most Honda cars I know, they use a group 51R battery.
The R is for reverse polarity. Did you get the 51 or the 51R????

If the vehicle engine can start and run
Then you just need to locate the horn and disconnect the electrical wire to silence it.

Maybe someone else would know more

The shifter release is near the shifter. Look for a small rectangular cover.
Using a small screwdriver, take the cover off. Pushed the screwdriver into the release and the shfiter should be able to move.

 

I solved the problem, thanks.

 

Would you like to share and help another person in need??????????