Water Pump: Inspection

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

WATER PUMP ASSEMBLY
1. Visually check the drain hole for coolant leakage. If leakage is found, replace the water pump assembly.
2. Turn the pulley and check that the water pump bearing moves smoothly and does not make any noise.
  If necessary, replace the water pump assembly.
  
  Fig 1: Checking Drain Hole For Coolant Leakage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002