2009 Toyota 4Runner Owners Manual - Page 351

3 -6 . Ot he r int e rior fe a t ure s Re a r side -vie w m irrors (if e quippe d) Rear side-view mirrors are useful as a secondary means of checking the area to the rear of the vehicle. Carefully check the area to the rear of the vehicle by either looking directly or using both outside and inside rear view mirrors. 328