Please advise me quickly. My car is at parking lot of store 10 miles away from my home right now. I own Honda CRV 2000 which came with factory set security alarm. I have lost remove control pads a while ago. I had trouble before when changing battery. Alarm(intermittent horn sound) will goes off and I can’t start car. But after battery off and on off bunch times, I was able to.
This time, I was driving on hiway yesterday, and I believe alternator of my CRV is failing, all my power was dimming and finally shut off. I barely managed to get off hiway and park on a store parking lot. My friend came over helped me to take out my battery and took me home. I fully charged up the dead battery on battery charger and went back to start the CRV, but when I connect ed fully charged battery to my CRV, horn goes off (solid monotone sound, not the intermittent alarm sound) and ignition is disabled. It will not crack at all. I am hoping there is some manual process to bypass all alarm system. Please advise me quick, my CRV is on parking lot 10 miles away in cold snowing Detroit.

I accidentally left the key inside and locked the door. After AAA road service opened the door, the alarm went off. Have to disconnect the battery to temporary stop that noise. I replaced the battery in the remote control, connected the car battery, alarm went off again. The remote control does not shut it off. What I can do at home to permanently disconnect the alarm as I think the alarm is useless at this stage and the car is old. Thank you in advance.