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Function Confirmation Procedure

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
  1. SET IN SELF-DIAGNOSTIC MODE 
    1. Turn ignition switch ON.
    2. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned ON.), press OFF switch for at least 5 seconds.
    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.
    • Former STEP-1 (LEDs and display screen are checked) does not exist in this self-diagnosis function.
    1. : GO TO 2.
  2. STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT 

    Does code No. 20 appear on the display? 

    1. YES: GO TO 3.
    2. NO: GO TO  13.
    Fig 1: Code 20 Screen Display
    G02364561Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP-3 

    Press temperature (UP) switch (driver side).

    Advance to self-diagnosis STEP-3? 

    1. YES: GO TO 4.
    2. NO: Replace A/C and AV switch. (Temperature dial malfunctions.)
  4. CHECK TO RETURN SELF-DIAGNOSIS STEP-2 

    Press temperature (DOWN) switch (driver side).

    Return to self-diagnosis STEP-2? 

    1. YES: GO TO 5.
    2. NO: Malfunctioning OFF switch or unified meter and A/C amp. Refer to "SELF-DIAGNOSIS ".
  5. STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED 

    Press temperature (UP) switch (driver side).

    Does code No. 30 appear on the display? 

    1. YES: GO TO 6.
    2. NO: GO TO  13.
    Fig 2: Code 30 Screen Display
    G02364562Courtesy of NISSAN MOTOR CO., U.S.A.
  6. STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED 
    1. Press temperature (UP) switch (driver side).
    2. Press (DEF) switch. Code No. of each door motor test is indicated on the display.
      1. : GO TO 7.
    Fig 3: Code 41 Screen Display
    G02364563Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK ACTUATORS 

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

    Fig 4: Identifying Discharge Air Flow
    G02364564Courtesy of NISSAN MOTOR CO., U.S.A.
    DIAGNOSIS PROCEDURE

      41 42 43 44 45 46
    Mode door position VENT B/L 1 B/L 2 FOOT(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 duty ratio 37% 91% 65% 65% 65% 91%
    Compressor ON ON OFF OFF ON ON
    Electronic control valve (ECV) duty ratio 100% 100% 0% 0% 50% 100%
    (1) FOOT position during automatic control. Refer to "AUXILIARY MECHANISM: FOOT POSITION SETTING TRIMMER ".

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

    OK or NG 

    1. OK: GO TO 8.
    2. NG :
  8. STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED 
    1. Press temperature (UP) switch (driver side).
    2. Code No. 51 appears on the display.
      1. : GO TO 9.
  9. CHECK AMBIENT SENSOR 

    Press (DEF) switch one time. Temperature detected by ambient sensor is indicated on the display.

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

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Go to Ambient Sensor Circuit. Refer to "AMBIENT SENSOR CIRCUIT ".
    Fig 5: Ambient Sensor Temperature Display
    G02364565Courtesy of NISSAN MOTOR CO., U.S.A.
  10. CHECK IN-VEHICLE SENSOR 

    Press (DEF) switch a second time. Temperature detected by in-vehicle sensor is indicated on the display.

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

    OK or NG 

    1. OK: GO TO 11.
    2. NG: Go to In-vehicle Sensor Circuit. Refer to "IN-VEHICLE SENSOR CIRCUIT ".
    Fig 6: In-Vehicle Sensor Temperature Display
    G02364566Courtesy of NISSAN MOTOR CO., U.S.A.
  11. CHECK INTAKE SENSOR 

    Press (DEF) switch a third time. Temperature detected by intake sensor is indicated on the display.

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

    OK or NG 

    1. OK: GO TO 12.
    2. NG: Go to Intake Sensor Circuit. Refer to "INTAKE SENSOR CIRCUIT ".
    Fig 7: Intake Sensor Temperature Display
    G02364567Courtesy of NISSAN MOTOR CO., U.S.A.
  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.

    OK or NG 

    1. OK :
      1. Turn ignition switch OFF or AUTO switch ON.
      2. INSPECTION END
    2. NG: Go to CAN communication. Refer to "CAN COMMUNICATION INSPECTION USING CONSULT-II (SELF-DIAGNOSIS) ".
      • Unified meter and A/C amp. - Display unit
      • Unified meter and A/C amp. - Display control unit
    Fig 8: CAN Communication Error Display
    G02364568Courtesy of NISSAN MOTOR CO., U.S.A.
  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.)

    Perform self-diagnosis STEP-2 under sunshine.

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

    DIAGNOSIS PROCEDURE

    Code No. Malfunctioning sensor (Including circuits) Reference
    21 / - 21 Ambient sensor (1)
    22 / - 22 In-vehicle sensor (2)
    24 / - 24 Intake sensor (3)
    25 / - 25 Sunload sensor (4)
    26 / - 26 Air mix door motor PBR (Driver side) (5)
    27 / - 27 Air mix door motor PBR (Passenger side)
    (1) "DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR ".
    (2) "DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR ".
    (3) "DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR ".
    (4) "DIAGNOSTIC PROCEDURE FOR SUNLOAD SENSOR ".
    (5) "DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR PBR ".
    Fig 9: Code 22, 21 Screen Display
    G02364569Courtesy of NISSAN MOTOR CO., U.S.A.
    1. : INSPECTION END
  14. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH 

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

    Fig 10: Door Motor Position Switch Table
    G02364570Courtesy of NISSAN MOTOR CO., U.S.A.

    (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: FOOT POSITION SETTING TRIMMER ".

    *4: "MODE DOOR MOTOR CIRCUIT ".

    *5: "INTAKE DOOR MOTOR CIRCUIT ".

    Fig 11: Code 36, 31, 32 Screen Display
    G02364571Courtesy of NISSAN MOTOR CO., U.S.A.
    1. : INSPECTION END
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