WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Main Harness Routing (Frontier 2.4L)
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Identifying Main Harness Routing (Frontier 3.3L)