Nissan Maxima Service and Repair Manual: Mode door control system

System Diagram

Nissan Maxima. 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.

SYSTEM OPERATION

  • The A/C auto amp. receives data from each of the sensors.
  • The A/C auto amp. sends the 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

Mode Door Control Specification

Nissan Maxima. Mode Door Control Specification

Mode position can be selected manually by pressing the MODE switch or the DEF switch on the A/C and AV switch assembly. Pressing the AUTO switch allows automatic control by the A/C auto amp.

During the automatic control of a mode position, a mode door position (VENT, B/L, FOOT, or D/F) is selected based on a target air mix door opening angle and sunload sensor, calculated by the A/C auto amp. In addition, the D/F is selected to prevent windshield fogging only when ambient temperature is extremely low.

    Automatic air conditioner system
    System Diagram CONTROL SYSTEM The control system consists of input sensors, switches, the A/C auto amp. (microcomputer) and outputs. The relationship of these components is as shown in the figure ...

    Air mix door control system
    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 temp ...

    Other materials:

    Intake sensor
    Removal and Installation REMOVAL Remove the evaporator (2). Refer to HA-48, "EVAPORATOR: Removal and Installation". Release the intake sensor clip (A), then remove the intake sensor (1). CAUTION: Mark the mounting position of the intake sensor. Do not damage the evapo ...

    Stopping the vehicle
    1. Safely move the vehicle off the road and away from traffic. 2. Turn on the hazard warning flashers. 3. Park on a level surface and apply the parking brake. Move the shift lever to P (Park). 4. Turn off the engine. 5. Raise the hood to warn other traffic and to signal professional roa ...

    The parking brake release warning continues displaying, or does not display
    Description  The parking brake warning is displayed while driving the vehicle even though the parking brake is released.  The parking brake warning is not displayed even though driving the vehicle with the parking brake depressed. Diagnosis Procedure 1.CHECK ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

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