Actually, the owner's manual does describe two different security systems - it just isn't particularly clear about what is standard or optional. It has a section labeled "ANTI-THEFT ALARM (IF EQUIPPED)". That's the optional part that includes the actual alarm (horn honking and lights flashing) as well as the interior motion detector and the inclination sensor for towing. The basic security system that comes as standard equipment is not an alarm - it just disables the engine if the correct electronically coded key is not used in the ignition.
Ahhh.... Got cha! Thanks for the clarification. Dang it! Thats an option I wish I had considered.