try locking the doors and using the key unlock the passenger side door
An alarm system was not a factory option
A 2003 Honda Civic with an OEM alarm system can enable program mode. This mode will allow the user to reset the alarm. To enable it turn the car on then press the lock button on the remote. Do this sequence three times in five seconds.
The alarm is controlled by the engine and body computers, there isn't an individual fuse.
When your alarm system is malfunctioning the horn will be when the engine is off. You will need to reset your antitheft system.
Insert the correct key into the ignition switch and start the engine. That should shut the alarm off.
The alarm system is a shared function of the body and engine computers. The body computer is on the inside of the under dash fuse panel. The engine computer is near the air cleaner box.
Some alarms systems have a protection function which will prevent starting the engine is somebody tried disconnect the battery and connect it again. Also what might happen is that your alarm system doesn't have memory in the case if you disconnect the battery. Thus, if you do disconnect the battery it will reset the alarm system to the default factory settings. By default, the alarm system will block starting the engine.
I replace engine but now it wont start.
The factory alarm does not have individual fuses. The engine and body computers both control portions of the alarm.
The factory alarm can not be disabled. It is part of the body and engine computers. It is reset by unlocking the doors with a key or remote.
Turn the ignition switch to the auxiliary position. Do not start the engine. Leave the ignition switch in the auxiliary position for 30 seconds. This will reset your alarm system.
The alarm is part of the programming of the body computer and engine computer. The body computer is under the dash on the driver side and the engine computer is under the hood.