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:

    Instrument Panel
    Vent Headlight/fog light/turn signal switch Supplemental front-impact air bag. Horn Meters and gauges. Warning and indicator lights. Vehicle information display Paddle shifters (if so equipped) Wiper and washer switch Audio controls*.  Navigation controls* Hazard warning ...

    U121D AV control unit
    DTC Logic Diagnosis Pro 1.CHECK PLAYBACK OF A DISK (CD) U121E AV CONTROL UNIT DTC Logic Diagnosis Procedure 1.CHECK PLAYBACK OF A DISK (CD) U1225 AV CONTROL UNIT DTC Logic DTC DETECTION LOGIC ...

    Steering wheel
    Removal and Installation REMOVAL NOTE: When removing spiral cable, use tape so that the case and rotating part keep aligned. This will prevent neutral position alignment procedure during spiral cable installation. Set steering wheel to the straight-ahead position. Remove driver air bag m ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2021 Copyright www.nimainfo.com
    0.0143