2005 Toyota RAV4, Auto Mate AM6, XCRS 500M, Avital 7143L

Hello, I am having electrical vehicle problems that I suspect are associated with this security/auto start system and hope some members here can help me resolve these. For example, a few days ago I accidentally pressed a button - which one is unknown - on the Avital 7143L fob that caused the vehicle horn to sound until I pressed the unlock button on the fob and shut down this alarm state of the system. The result of this action is my horn has been sounding each time I start the car and still does as of today. Time will cause this to stop (...as it has in the past...) but I need to prevent this from occurring before Monday at 5 AM when I leave the house for work. Note the above scenario is just one aspect I have been experiencing with this vehicle since I purchased it in January of 2026. Other examples of undesirable behavior include the horn sounding when I unlock the vehicle with the key rather then the 7143L. I am also experiencing the Check Engine Light (CEL) being displayed intermittently with the same three codes (O2, Ft. Rt. Wheel Speed Sensor, Communication w/ABS module). I also suspect my CEL is due to vehicle grounding but I do know the security/auto start system is acting up so these DTC's may also be an aspect of this system. Let this rattle around your head and see if you can offer me any meaningful suggestions. I have been able to locate manuals for both the AM6 and the XCRS 500M but I did not find this documentation useful. Thanks.