WHEN YOU INSERT THE KEY IN THE DRIVER'S DOOR LOCK AND TURN IT QUICKLY, THE PASSENGER'S DOOR MAY NOT LOCK AND THE SECURITY SYSTEM MAY NOT ARM. IN ADDITION, IF YOU OPEN THE TRUNK AND THEN IMMEDIATELY CLOSE IT, THE SECURITY SYSTEM MAY NOT ARM THE TRUNK. THIS IS CAUSED BY A TIMING DISCREPANCY IN THE MULTIPLEX INTEGRATED CONTROL UNIT - PRODUCT UPDATE. *TT