An exterior rearview mirror assembly for a vehicle includes a principal reflective element, a wide angle auxiliary reflective element and a back plate. The principal reflective element is disposed at a principal reflective element region of the back plate and has a cutout at a corner region thereof. The wide angle auxiliary reflective element is disposed at the auxiliary reflective element region of the back plate and is adjacent to the principal reflective element at the corner region of the principal reflective element. A single heater pad is disposed between the principal reflective element and the principal reflective element region of the back plate and between the wide angle auxiliary reflective element and the auxiliary reflective element region of the back plate. When powered, the single heater pad heats the principal reflective element and the wide angle auxiliary reflective element.