WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
For circuit terminal identification, see Fig 1 or Fig 2
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Fig 1: Circuit Testing Value Chart For DTC P0037 Or DTC P0038: HO2S2 Heater (2.5L)
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Circuit Testing Value Chart For DTC P0037, DTC P0038, DTC P0057 Or DTC P0058: HO2S2 Heater (3.5L)