The only sedan Honda currently offers with 'standard' blind spot monitoring is the Accord EX trim and higher. All other sedans (Insight, Clarity, Accord LX, Civic) have LaneWatch camera that only activates to display image when right turn signal is activated.
Cars with LaneWatch have a camera mounted on the bottom section of the passenger-side side mirror only.
Cars with blind spot monitoring have tone-on-tone 'car icons' in the upper outer corner of both the driver and passenger side, which light up when the turn signal is activated left or right. The actual sensors for blind spot monitoring are located in the left and right rear quarter panels of the car. The placement of the sensors also enable 'rear cross traffic alert' when backing up.