Owner's Manual
Page 76
... detect, warn, or respond to potential collisions. Driver Controls Cause The surface of the radar in the grille is dirty or obstructed in some way The surface of the radar in the grille is clean but the message remains in the display Heavy rain or snow is interfering with brake controls... Failing to do so may result in serious injury. 76 WARNING: Do not use ACC when towing a trailer with the radar signals Action Clean the grille surface in front of vehicle control, which could result in a loss of the radar or remove the object causing the obstruction Wait a short time.
... detect, warn, or respond to potential collisions. Driver Controls Cause The surface of the radar in the grille is dirty or obstructed in some way The surface of the radar in the grille is clean but the message remains in the display Heavy rain or snow is interfering with brake controls... Failing to do so may result in serious injury. 76 WARNING: Do not use ACC when towing a trailer with the radar signals Action Clean the grille surface in front of vehicle control, which could result in a loss of the radar or remove the object causing the obstruction Wait a short time.