Nissan Maxima Service and Repair Manual: Air mix door control system

System Diagram

Nissan Maxima. System Diagram

System Description

The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined value by the temperature setting, ambient temperature, intake temperature and amount of sunload.

SYSTEM OPERATION

  • The A/C auto amp. receives data from each of the sensors.
  • The A/C auto amp. sends air mix door, the mode door and the intake door opening angle data to the air mix door motor LCU(s), the mode door motor LCU and the intake door motor LCU.
  • The air mix door motor(s), the mode door motor and the intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the A/C auto amp. and each of the motor position sensors are compared by the LCUs in each door motor with the existing decision and opening angles.
  • Next, HOT/COLD, DEF/VENT or FRE/REC operation is selected. The newly selected data is returned to the A/C auto amp.

Door Motor Circuit

Nissan Maxima. Door Motor Circuit

Air Mix Door Control Specification

Nissan Maxima. Air Mix Door Control Specification

When ignition switch is ON, the A/C auto amp. continuously and automatically controls temperatures, regardless of air conditioner operational condition. When setting a target temperature with the temperature control switch, the A/C auto amp. corrects the set temperature and decides a target air mix door opening angle. The A/C auto amp. controls the air mix door according, to the target air mix door opening angle and the current air mix door opening angle, keeping an optimum air mix door opening angle. When the temperature is set at 18C (60F), air mix door is set on full-cold, and when the temperature is set at 32C (90F), it is set to full-hot.

    Mode door control system
    System Diagram System Description The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temperature, intake temperature and amount of sunload. ...

    Intake door control system
    System Diagram System Description The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle temperature, intake temperature, amount of sunload ...

    Other materials:

    Removal and installation
    WHEEL HUB Removal and Installation Knuckle Baffle plate  Wheel hub assembly  Brake rotor Wheel nut Anchor block Wheel sensor Parking brake cable Refer to PB-6, "Exploded View".  Refer to BRC-103, "Removal and Installation - Rear Wheel Sensor". &nb ...

    Basic inspection
    DIAGNOSIS AND REPAIR WORKFLOW Work Flow (With GR8-1200 NI) STARTING SYSTEM DIAGNOSIS WITH GR8-1200 NI To test the starting system, use the following special service tool:  GR8-1200 NI Multitasking battery and electrical diagnostic station NOTE: Refer to the diagnostic station Instru ...

    Preparation
    Special Service Tool The actual shapes of the tools may differ from those illustrated her Commercial Service Tool ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

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