How do you install a serpentine belt on a 2004 Toyota Camry?

To install a serpentine belt on a 2004 Toyota Camry, first, ensure that the engine is off and cool. Use a wrench to rotate the tensioner pulley counterclockwise to relieve tension on the old belt, then remove it. Route the new serpentine belt around the pulleys according to the belt routing diagram typically found near the radiator or in the owner's manual. Finally, pull the tensioner back to its original position to apply tension to the new belt and double-check that it is properly seated on all pulleys.