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When you open the CR-V does the horn start going off?
Sounds like you have a key that is not programmed to start the CR-V. There is a chip inside and if you look at the dash board you will see a green light that looks like a key flashing. That light is not supposed to be flashing.
You will need to have the vehicle towed to the nearest Honda dealer to program the key to you CR-V.
Sorry the news is not better or easier for you.
was it started with this new key you have?
Then this does change the situation. Do you see the green light flashing?
I assume the engine does turn over but will not run....correct?
Try locking the door with the key and unlocking it again using the key and let me know what happens.
A blue alarm light is not factory. Look under the dash on the drivers side for a small toggle switch or black button. When you turn the key to on move the toggle switch or push the button and then try to start the CR-V.
If the does not work try to follow those wires to the "brain box" for the alarm and try to unplug everything. This may get you started.
It is going to be tough from here since this is not a factory system and do not know exactly what you have.
I do understand that but a Honda accessory alarm would have a red led mounted right behind the steering wheel.
I will be away from my computer for about an hour but wil be back if you need me.
Glad you got it to start. Now if you push the button or flip the switch back and forth it may stop the horn also.
You can not pull the horn fuse because it is also for the brake lights.