Rear Fan Control Switch
WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
When the rear fan switch (front) is in the OFF position, the rear blower motor cannot operate.
When the rear fan switch (front) is in the REAR position, it allows the rear fan switch (rear) to control the rear blower motor speed. In any other position (1-4), the rear fan switch (front) controls the rear blower motor speed regardless of the rear fan switch (rear) position.