I'm a new member that has experienced this Security Alarm issue and my mechanic told me to try disconnecting the battery for 2-3 DAYS as some units take a while for the actual memory to reset and this worked. I had 12 months of various intermittent issues and nothing worked. Also my mechanic also informed us that he has even resorted to putting some RCU's in the freezer for a short period of time to reset and this worked also.