WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
Check resistance by heating with hot water or heat gun as shown in the figure.
Fig 1: Temperature And Resistance Chart
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Checking Resistance By Heating With Hot Water Or Heat Gun