Pathfinder 2WD V6-4.0L (VQ40DE) (2009)
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Air Door Actuator / Motor: Description and Operation
Air Mix Door Motor
Automatic Air Conditioner
AIR MIX DOOR MOTOR
System Description
SYSTEM DESCRIPTION
SYMPTOM:
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Discharge air temperature does not change.
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Air mix door motor does not operate.
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
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A/C auto amp.
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A/C and AV switch assembly
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Air mix door motors (driver, passenger, and rear)
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PBR (built-into air mix door motors)
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In-vehicle sensor
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Ambient sensor
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Optical sensor
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Intake sensor
System Operation
The A/C auto amp. receives data from the temperature selected by the driver side, passenger side, and rear.
The A/C auto amp. then applies a voltage to one circuit of the appropriate air mix door motor, while ground is applied to the other circuit, causing the
appropriate air mix door motor to rotate. The direction of rotation is determined by which circuit has voltage applied to it, and which one has ground
applied to it. The A/C auto amp. monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.
In AUTO mode the air mix, intake, mode door, and defrost door positions are set by the A/C auto amp. which determines the proper position based on
inputs from the in-vehicle sensor, ambient sensor, optical sensor, intake sensor, and the temperature selected by the driver and front and rear
passengers.
Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new door position data is returned to the
A/C auto amp.
Air Mix Door Control Specification