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Function Confirmation Procedure

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. ENTER SELF-DIAGNOSTIC MODE 
    CAUTION:
    • If battery voltage drops below 12V during diagnosis STEP 3, actuator speed becomes slower and as a result, the system may generate an error even when operation is usual. To avoid this, start engine before performing this diagnosis.
    NOTE: Former STEP 1 (LEDs and display screen are checked) no longer exist in this self-diagnosis function.
    1. Start engine.
    2. Within 10 seconds after starting engine, press OFF switch for at least 5 seconds.
      NOTE: Self-diagnostic mode can be canceled by either pressing AUTO switch, turning the ignition switch OFF, or pressing the BACK button if equipped with NAVI.

      : GO TO  2.

  2. SELF-DIAGNOSIS STEP 2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT 
    NOTE: When conducting test indoors, aim a light (more than 60W) at sunload sensor, otherwise Code No. 25 will indicate despite that sunload sensor is functioning properly

    Does code No. 20 appear on the display 25 seconds after "2" is illuminated? 

    Yes: GO TO  3.

    No: GO TO  13.

  3. CHECK OPERATION OF TEMPERATURE CONTROL DIAL 

    Rotate the temperature control dial (driver) clockwise.

    Does the temperature control dial advance to self-diagnosis STEP 3? 

    Yes: GO TO  4.

    NO: Malfunctioning temperature control dial.

    : Check front air control. Refer to "FRONT AIR CONTROL SELF - DIAGNOSIS ".

  4. CHECK TO RETURN SELF-DIAGNOSIS STEP 2 

    Rotate the temperature control dial (driver) counterclockwise.

    Does the temperature control dial return to self-diagnosis STEP 2? 

    Yes: GO TO  5.

    NO: Malfunctioning temperature control dial.

    : Check front air control. Refer to "FRONT AIR CONTROL SELF - DIAGNOSIS ".

  5. SELF-DIAGNOSIS STEP 3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED 

    Rotate the temperature control dial (driver) clockwise to STEP 3.

    Does code No. 30 appear on the display 50 seconds after "3" is illuminated? 

    Yes: GO TO  6.

    No: GO TO  14.

  6. STEP 4: CHECK OPERATION OF EACH ACTUATOR 
    1. Rotate the temperature control dial (driver) clockwise to STEP 4.
    2. Press (DEF) switch. Code No. "41" is indicated on the display. Continue to press (DEF) switch to cycle through each actuator test (41 to 46).

      : GO TO  7.

  7. CHECK ACTUATORS 

    Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and compressor operation.

    Fig 1: Discharge Air Flow Chart
    G04917541Courtesy of NISSAN MOTOR CO., U.S.A.
    ACTUATOR TEST CODE REFERENCE CHART

    Actuator test code no. 41 42 43 44 45 46
    Mode door position VENT B/L1 B/L2 D/F1*1 D/F DEF
    Intake door position REC REC 20%FRE FRE FRE FRE
    Air mix door position FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
    Blower motor voltage (approx.) 5V 11.75V 8.5V 8.5V 8.5V 11.75V
    Compressor ON ON OFF OFF ON ON

    Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for improper operation.

    *1: D/F1 automatically controls the mode door position. Refer to the Discharge air flow table "AUXILIARY MECHANISM: DEFROST/FOOT POSITION SETTING TRIMMER ".

    OK or NG 

    OK: GO TO  8.

    NG:

  8. SELF-DIAGNOSIS STEP 5: TEMPERATURE OF EACH SENSOR IS CHECKED 
    1. Rotate the temperature control dial clockwise (driver) to STEP 5.
    2. Code No. 51 appears on the display.

      : GO TO  9.

  9. CHECK AMBIENT SENSOR 

    Press (DEF) switch one time. Temperature detected by ambient sensor is indicated on the display (°F for U.S.A. model, °C for Canada and Mexico models).

    NOTE: If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.

    OK or NG 

    OK: GO TO  10.

    NG: GO TO "AMBIENT SENSOR CIRCUIT ".

  10. CHECK IN-VEHICLE SENSOR 

    Press (DEF) switch a second time. Temperature detected by in-vehicle sensor is indicated on the display (°F for U.S.A. model, °C for Canada and Mexico models).

    NOTE: If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.

    OK or NG 

    OK: GO TO  11.

    NG: GO TO "IN-VEHICLE SENSOR CIRCUIT ".

  11. CHECK INTAKE SENSOR 

    Press (DEF) switch a third time. Temperature detected by intake sensor is indicated on the display (°F for U.S.A. model, °C for Canada and Mexico models).

    NOTE: If temperature shown on display greatly differs from actual temperature, check sensor circuit first, then inspect sensor.

    OK or NG 

    OK: GO TO  12.

    NG: GO TO "INTAKE SENSOR CIRCUIT ".

  12. CHECK CAN COMMUNICATION ERROR 
    1. Press (REC) switch.
    2. CAN communication error between unified meter and A/C amp. and DISPLAY UNIT or DISPLAY CONTROL UNIT is detected.
    Fig 2: Display CAN Communication Error
    G04917542Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK:

    1. Turn ignition switch OFF or AUTO switch ON.
    2. Inspection End.

    NG: GO TO CAN communication. Refer to "CAN COMMUNICATION SYSTEM DESCRIPTION ".

    • Unified meter and A/C amp. - DISPLAY UNIT
    • Unified meter and A/C amp. - DISPLAY CONTROL UNIT
  13. CHECK MALFUNCTIONING SENSOR 

    Refer to the following chart for malfunctioning code No.

    (If two or more sensors malfunction, corresponding code Nos. blink respectively twice.)

    When conducting indoors, aim a light (more than 60W) at sunload sensor, otherwise Code No. 25 will indicate despite that sunload sensor is functioning properly.

    NOTE: Code 20 will be displayed if all sensors and PBR(s) are OK.
    MALFUNCTIONS SENSOR PAGE REFERENCE CHART

    Code No. Malfunctioning sensor (Including circuits) Reference
    21 /-21 AMBIENT SENSOR DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR 
    22 /-22 IN-VEHICLE SENSOR DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR 
    24 /-24 INTAKE SENSOR DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR 
    25 /-25 Sunload sensor(1) DIAGNOSTIC PROCEDURE FOR SUNLOAD SENSOR 
    26 /-26 Air mix door motor PBR (Driver) DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT 
    27 /-27 Air mix door motor PBR (Passenger)
    (1) Conduct self-diagnosis STEP-2 under sunshine.
    Fig 3: Display Code No (Sensor Malfunctions)
    G04917543Courtesy of NISSAN MOTOR CO., U.S.A.

    : Inspection End.

  14. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH 

    Mode and/or intake door motor PBR(s) malfunctioning.

    NOTE: Code 30 will be displayed if all doors are OK.
    MALFUNCTIONS SENSOR PAGE REFERENCE CHART

    Code No. (1)(2) Mode or intake door position
    31 VENT MODE DOOR MOTOR 
    32 B/L 1
    33 B/L 2
    34 FOOT(3)
    35 D/F
    36 DEF
    37 FRE INTAKE DOOR MOTOR 
    38 20% FRE
    39 REC
    (If two or more mode or intake doors are out of order, corresponding code numbers blink respectively twice.)
    (1) If mode door motor harness connector is disconnected, the following display pattern will appear.

    31→32→33→34→35→36→Return to 31
    (2) If intake door motor harness connector is disconnected, the following display pattern will appear.

    37→38→39→Return to 37
    (3) FOOT position during automatic control. Refer to "AUXILIARY MECHANISM: DEFROST/FOOT POSITION SETTING TRIMMER ".
     
     
     
     
     
    Fig 4: Display Code No (Door Out Of Order)
    G04917544Courtesy of NISSAN MOTOR CO., U.S.A.

    : Inspection End.

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