Fan Control Amplifier
WARNING: This page is about a different car, the 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
The fan control amplifier is located on the cooling unit. The fan control amp. receives a gate voltage from the auto amp. to steplessly maintain the blower fan motor voltage in the 5 to 12 volt range (approx.).
Courtesy of NISSAN MOTOR CO., U.S.A.