Fan Control Amplifier
WARNING: This page is about a different car, the 2003 Nissan Altima. 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 smoothly maintain the blower fan motor voltage in the 5 to the 12V range (approx.).
Courtesy of NISSAN MOTOR CO., U.S.A.