Check the brake fluid level under the hood, it may be a little low, and depending on the angle your car is sitting or the gravity forces during driving the sensor may move and register low..the alternator/battery light could be several things..battery post connections; bad alternator-usually can be checked for free at an Auto parts store. as for the open door open light, does the dome light come on at the same time? if so, check the spring-loaded plungers in the door jambs. adjust if possible.