Nissan Titan. Manual - part 424
AIR MIX DOOR MOTOR
HAC-201
< DTC/CIRCUIT DIAGNOSIS >
[MANUAL A/C (TYPE 2)]
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AIR MIX DOOR MOTOR
System Description
INFOID:0000000009882578
SYSTEM DESCRIPTION
SYMPTOM:
• Discharge air temperature does not change.
• Air mix door motor does not operate.
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• Front air control
• Air mix door motor
• PBR (built-into air mix door motors)
• Intake sensor
System Operation
The front air control receives data from the temperature selected by the driver side, passenger side, and rear.
The front air control 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 front air con-
trol monitors the air mix door positions by measuring the voltage signal on the PBR circuits of each door.
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motors
The air mix door motor is attached to the front heater & cooling unit
assembly. The motor rotates so that the air mix door is opened or
closed to a position set by the front air control. Motor rotation is then
conveyed through a shaft and the air mix door position is then fed
back to the front air control by the PBR built into the air mix door
motor.
Air Mix Door Motor Component Function Check
INFOID:0000000009882579
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE INCREASE
1. Turn the temperature control dial clockwise to maximum hot.
2. Check for hot air at discharge air outlets.
WJIA0435E
WJIA1417E