An exterior rearview mirror assembly for a vehicle includes a mirror head and a light module disposed at a mirror casing. A blind zone indicator light emitting diode and a turn signal indicator light emitting diode are disposed at a single circuit board and are operable to emit light for a blind zone indicator and a turn signal indicator, respectively. The blind zone indicator and the turn signal indicator are disposed along a forward and sideward portion of the mirror casing, where the turn signal indicator is viewable and the blind zone indicator is not viewable along the forward and sideward portion of the mirror casing. When the blind zone indicator light emitting diode is operated and when the exterior rearview mirror assembly is attached at the side of the vehicle, the blind zone alert is viewable by the driver of the vehicle outboard of the mirror reflective element.