02 honda crv doors lock as soon as I get in car and keyless remote won't open doors

I am assuming that you had an Aftermarket Alarm installed and probably not equipped to do this function. The Aftermarket Alarms normally have a horn to signal activation.

hi
Chance are the driver side control module is not working.
Open the driver side, inner door panel and check

Electronic Chassis Control Module remote door lock module located in the drivers door. Black about the size of a pack of cigarettes.

-If the problem is that keyless remote does unlock or lock door, but the lock lever still move when pulling up and down by hand. Door still open and close with both inner and outer, then might the driver door lock actuator is bad. The actuator lock and unlock the door for you when using the keyless remote or door lock/unlock switch.

-if you try using the key to unlock door and the key doesn't turn the door cylinder, then you have a bad door lock cylinder.

-if the lock lever doesn't move up or down and you can't open door using any handle, then you got a bad lock latch assembly.

I'm not sure what the issue is but hope this helps you.

The reset code for the factory installed radio is on a sticker in the glove box. The sticker has 2 set of numbers. The number set with 5 digits is the reset code for your factory installed radio.

1. You have to hit your unlock button a second time to unlock the other doors. If you know this and are, and it's only the one door that's not working, then you need a power door lock actuator replaced. It's attached to the latch inside the door and unlocks and lock the door.
2. Not sure what a burring sound is, but if you're describing what it sounds like then it could be the A/C clutch, but you also have to remember that you should notice the RPMs on a CR-V drop about 500rpm when the A/C compressor clutch engages. That's normal. If it's making a funny sound, you need to have a Honda dealer check it out, they will know for sure if it's normal or not.
   

the little motor that operates it inside the door is probably frozen, so it will need to be replaced!!

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The computer detected a fault. You SHOULD NOT drive it around with that blinking, or you will regret it. Take it to the dealership immediately and have them pull the code.

I had the same problem with the lights alarm on my 2002 CRV. The alarm is linked in to the door open switch on the drivers side. If you open the door, about half way down on the centre post you'll see a rubber covered push switch. This is held in place by a single phillips screw. Remove the screw and gently pull out the cover. On mine, the wires had become unclipped from behind and just had to be reconnected (push fit).

Apparently this is a fairly common problem caused by the seatbelt being caught in the door and catching the switch.