WARNING: This page is about a different car, the 2018 Nissan NV3500 HD, 2018 Nissan NV2500 HD, and 2018 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
Heater Pump Relay
Check continuity between terminals 3 and 5.
Courtesy of NISSAN NORTH AMERICA, INC.
Conditions
Continuity
12V direct current supply between terminals 1 and 2