Dual Switch

WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.

When the DUAL switch indicator is illuminated, the driver side and passenger side temperature can each be set independently.
When the DUAL switch indicator is not illuminated, the driver side outlet and setting temperature is applied to both sides.