If I don't reenter the radio code can I lock the doors without the alarm going off

Hello, the radio code has absolutely nothing to do with the antitheft system on a factory equipped antitheft system for your Ridgeline. The radio code only influences radio operation after a loss of electrical power to the unit. There are many possible causes of your antitheft system going off, again, if it is the Honda factory system. All doors as well as the hood must indicate being closed, and if an electrical issue with one of the door switches is present, the horn will sound. Hands on electrical testing using a diagnostic tool that has body systems monitoring capability is essential to figure out what is going on here. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops