Are you talking when it activates? Sometimes mine will do that as well when it thinks I say "Hey Google" or something that sounds just like it.
Disconnected Siri through settings in the car and made sure software was up to date. Still the same issue.You can disable Siri from listening, or disable it completely. You can also change Siri to respond to something else rather then "Hey Siri" as I know from experience that it can trigger when you're not even referring to it.
How to turn off Siri on your iPhone or iPad | Digital Trends
Could be an issue with the steering wheel button. May need to take it to Honda.Disconnected Siri through settings in the car and made sure software was up to date. Still the same issue.