Check the air bag warning indicator. It should "prove out" for about 6 seconds after the ignition is turned on. If the air bag monitor (the blue box) detects an open circuit in the air bag warning indicator circuit (ie: a burned out bulb) it will beep at you. If I remember correctly it is a series of five beeps repeated about 5 times. This is repeated every 30 minutes if the ignition is on that long.
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