Try disconnecting the battery for 30 minutes, however you really need to get a code to sort this if it is not a loose connection, so a better procedure is to find out what codes are present before clearing them. Instead of turning the key off the fourth time, leave it on. A different blink pattern will appear and tell you which unit or units the diagnostic unit thinks are at fault. These patterns are shown in the Service Manual beginning on page SRS-34.
Alex.