I recently purchased an S60 and I'm a bit confused with the seatbelt reminder light in the rearview mirror; it turns on after I turn the engine on, then it turns itself off in a few seconds, regardless of whether I have the seatbelt on or not. Shouldn't it stay on if I'm not wearing the belt? The car also doesn't beep if I drive off without the seatbelt on. This behavior makes little sense for any car, much less a safety-oriented one. Is this normal or could I maybe have a defective sensor or such? J.D.