Blower Relay
WARNING: This page is about a different car, the 2011 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
BCM turns ON the blower relay to supply ignition power supply or ignition switch ON signal to each ECU when the ignition switch is turned ON.
BCM compares status of blower relay control signal, and power supply position judged by BCM.