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Function Confirmation Procedure

WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.
  1. SET IN SELF-DIAGNOSIS MODE 
    1. Turn ignition switch ON.
    2. Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned ON.), press OFF switch for at least 5 seconds.
      NOTE:
      • If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a result, the system may generate an error even when operation is normal. 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.

    >> GO TO 2.

  2. STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT 

    Does code No. 20 appear on the display? 

    YES: GO TO 3.

    NO: GO TO  13.

    Fig 1: Display Screen - Code No. 20
    G04887554Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP-3 

    Press temperature control (UP) switch (driver side).

    Advance to self-diagnosis STEP-3? 

    YES: GO TO 4.

    No: Replace Multifunction switch. (Temperature control switch is malfunctioning.)

  4. CHECK TO RETURN SELF-DIAGNOSIS STEP-2 

    Press temperature control (DOWN) switch (driver side).

    Return to self-diagnosis STEP-2? 

    YES: GO TO 5.

    No: Malfunctioning multifunction 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 control (UP) switch (driver side).

    Does code No. 30 appear on the display? 

    YES: GO TO 6.

    NO: GO TO  14.

    Fig 2: Display Screen - Code No. 30
    G04887555Courtesy of NISSAN MOTOR CO., U.S.A.
  6. STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED 
    1. Press temperature control (UP) switch (driver side).
    2. Press (DEF) switch. Code No. of each door motor test is indicated on the display.

    >> GO TO 7.

    Fig 3: Display Screen - Code No. 41
    G04887556Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK ACTUATORS 

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

    Fig 4: Discharge Air Flow Chart
    G00479666Courtesy of NISSAN MOTOR CO., U.S.A.
    CODE CHART

    Code No. 41 42 43 44 45 46
    Mode door position VENT B/L 1 B/L 2 FOOT(1) D/F DEF
    Upper ventilator door position OPEN SHUT SHUT SHUT SHUT SHUT
    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%
    Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper operation.
    (1) FOOT position during automatic control. Refer to "AUXILIARY MECHANISM: FOOT POSITION SETTING TRIMMER ".

    OK or NG 

    OK: GO TO 8.

    NG:

    Go to Magnet Clutch Circuit. Refer to "MAGNET CLUTCH CIRCUIT ".

  8. STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED 
    1. Press temperature control (UP) switch (driver side).
    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.

    NOTE: If the temperature indicated on the display greatly differs from the actual temperature, check sensor circuit first, and then check sensor.

    OK or NG 

    OK: GO TO 10.

    NG: GO TO Ambient Sensor Circuit. Refer to "AMBIENT SENSOR CIRCUIT ".

    Fig 5: Display Screen - Ambient Sensor Temperature
    G04887557Courtesy of NISSAN MOTOR CO., U.S.A.
  10. CHECK IN-VEHICLE SENSOR 

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

    NOTE: If the temperature indicated on the display greatly differs from the actual temperature, check sensor circuit first, and then check sensor.

    OK or NG 

    OK: GO TO 11.

    NG: GO TO In-vehicle Sensor Circuit. Refer to "IN-VEHICLE SENSOR CIRCUIT ".

    Fig 6: Display Screen - In-Vehicle Sensor Temperature
    G04887558Courtesy of NISSAN MOTOR CO., U.S.A.
  11. CHECK INTAKE SENSOR 

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

    NOTE: If the temperature indicated on the display greatly differs from the actual temperature, check sensor circuit first, and then check sensor.

    OK or NG 

    OK: GO TO 12.

    NG: GO TO Intake Sensor Circuit. Refer to "INTAKE SENSOR CIRCUIT ".

    Fig 7: Display Screen - Intake Sensor Temperature
    G04887559Courtesy of NISSAN MOTOR CO., U.S.A.
  12. CHECK CAN COMMUNICATION ERROR 
    1. Press intake switch.
    2. CAN communication error between each unit that uses the unified meter and A/C amp. can be detected as self-diagnosis results. (If plural errors occur, the display of each error will blink twice for 0 - 5 second intervals.)

    OK or NG 

    OK:

    1. Turn ignition switch OFF or AUTO switch ON.
    2. INSPECTION END

    NG: GO TO CAN communication. Refer to "DTC [U1000] CAN COMMUNICATION CIRCUIT ".

    • Unified meter and A/C amp. - AV control unit or NAVI control unit
      Fig 8: Display Screen - CAN Communication Error
      G05213948Courtesy of NISSAN MOTOR CO., U.S.A.
  13. CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR 

    Refer to the following chart for malfunctioning code No.

    (If two or more sensors and door motors malfunction, corresponding code Nos. indicates 1 second each.)

    (If two door motors malfunction, corresponding code Nos. indicates 0.5 second each.)

    *1: Perform self-diagnosis STEP-2 under sunshine.

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

    CODE CHART

    Code No. Malfunctioning sensor and door motor (Including circuits) Reference page
    21 / -21 Ambient sensor DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR 
    22 / -22 In-vehicle sensor DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR 
    24 / -24 Intake sensor DIAGNOSIS PROCEDURE FOR INTAKE SENSOR 
    25 / -25 Sunload sensor*1 DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR 
    26 / -26 Air mix door motor PBR (Driver side) DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR 
    27 / -27 Air mix door motor PBR (Passenger side)
    Fig 9: Display Screen - Sensor Malfunctions
    G04919046Courtesy of NISSAN MOTOR CO., U.S.A.

    >> INSPECTION END

  14. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH 

    Door motor PBR is malfunctioning.

    CODE CHART

    Code No.(1)(2)(3) Door position Reference page
    31 VENT (Driver side) Mode door motor DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR 
    32 DEF (Driver side)
    33 VENT (Passenger side)
    34 DEF (Passenger side)
    35 UPPER VENT (Open) Upper ventilator door motor DIAGNOSIS PROCEDURE FOR UPPER VENTILATOR DOOR MOTOR 
    36 UPPER VENT (Shut)
    37 FRE Intake door motor DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR 
    38 20% FRE
    39 REC
    (If two or more door motors malfunction, corresponding code Nos. indicates 1 second each.)
    (1) If mode door motor (driver and passenger side) harness connector is disconnected, the following display pattern will appear. 31→32→33→34→Return to 31
    (2) If upper ventilator door motor harness connector is disconnected, the following display pattern will appear. 35→36→Return to 35
    (3) If intake door motor harness connector is disconnected, the following display pattern will appear. 37→38→39→Return to 37
    Fig 10: Display Screen - Door Motor Malfunctions
    G04919047Courtesy of NISSAN MOTOR CO., U.S.A.

    >> INSPECTION END

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