How do you replace a serpentine belt on a 2003 Infiniti QX4?

To replace the serpentine belt on a 2003 Infiniti QX4, first, ensure the engine is off and cool. Locate the serpentine belt tensioner and use a wrench or socket to relieve tension on the belt. Remove the old belt, noting the routing path, then install the new belt following the same path. Finally, release the tensioner back into place and check the belt alignment before starting the engine.