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The light is supposed to stay on, when the key is used the system is not armed, it should not kill the battery if the battery is in good shape. I suggest you take it and have the battery load tested.
Check the door switches, you may have one that's shorted. If they are all OK, the BCM is causing the problem. Easiest and cheapest solution is to remove the bulbs from the lights that are always on. It means they will not operate and if you don't feel safe at night without them, its not an option for you, If it doesn't bother you one way or the other, remove the bulbs. This will stop your battery from draining, but the door ajar light on the dash will stay on all the time. If it bothers you, cover it up!
check for lights on, glove box trunk, under hood, these lights will run down the battery if they stay on, also if you have an aftermarket amp make sure its wired to key on power and not full time power
If you have a key to the car then just open it that way. Or if there's no danger of you being locked out, or your car alarn going off, then just keep guessing. Like: 0000, 0001, 0002...
i might be a bad altinator but i would double check your battery. a bad battery will kill a new altinator. does the battery light stay on? if the battery light on the dash is not on you may have another problem...
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