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Home >> Infiniti >> 2004 >> G35 x >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> 2004.5 - Automatic Air Conditioner - Sedan >> Trouble Diagnosis >> Self-Diagnosis Function >> Function Confirmation Procedure

Function Confirmation Procedure

  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.
    1. GO TO 2.
  2. STEP-1: LEDS AND DISPLAY ARE CHECKED 

    Check LED illumination and display screen.

    Fig 1: Identifying Display Screen
    G03327633Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 2: Identifying LED Illumination
    G03327634Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Malfunctioning OFF switch or display and A/C auto amp. Refer to "MULTIPLEX COMMUNICATION CIRCUIT ".
  3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP-2 

    Press the TEMP (UP) switch.

    Advance to self-diagnosis STEP-2?

    1. YES: GO TO 4.
    2. NO: Replace A/C and audio controller. (TEMP switch malfunctioning.)
  4. CHECK TO RETURN SELF-DIAGNOSIS STEP-1 

    Press the TEMP (DOWN) switch.

    Return to self-diagnosis STEP-1?

    1. YES: GO TO 5.
    2. NO: Replace A/C and audio controller. (TEMP switch malfunctioning.)
  5. STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT 

    Press the TEMP (UP) switch.

    Does code No. 20 appear on the display?

    1. YES: GO TO 6.
    2. NO: GO TO  14.
      Fig 3: Display Checking - Sensor Circuit Open Or Short Circuit
      G03327635Courtesy of NISSAN MOTOR CO., U.S.A.
  6. STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED 

    Press the TEMP (UP) switch.

    Does code No. 30 appear on the display?

    1. YES: GO TO 7.
    2. NO: GO TO  15.
      Fig 4: Display Checking - Mode Door And Intake Door Positions
      G03327636Courtesy of NISSAN MOTOR CO., U.S.A.
  7. STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED 
    1. Press the TEMP (UP) switch.
    2. Press (DEF) switch. Code No. of each door motor test is indicated on the display.
    1. GO TO 8.
      Fig 5: Display Checking - Operation Of Each Door Motor
      G03327637Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK ACTUATORS 

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

    Fig 6: Air Flow, Air Temperature, Blower Motor Voltage Chart
    G03327638Courtesy of NISSAN MOTOR CO., U.S.A.
    AIR TEMPERATURE SPECIFICATIONS

    Code No. 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 9.
    2. NG: Go to next step.
  9. STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED 
    1. Press the TEMP (UP) switch.
    2. Code No. 51 appears on the display.
    1. GO TO 10.
  10. 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 

    Fig 7: Display Checking - Ambient Sensor
    G03327639Courtesy of NISSAN MOTOR CO., U.S.A.
    1. OK: GO TO 11.
    2. NG: Go to AMBIENT SENSOR CIRCUIT. Refer to "AMBIENT SENSOR CIRCUIT ".
  11. 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 

    Fig 8: Display Checking - In-Vehicle Sensor
    G03327640Courtesy of NISSAN MOTOR CO., U.S.A.
    1. OK: GO TO 12.
    2. NG: Go to IN-VEHICLE SENSOR CIRCUIT. Refer to "IN-VEHICLE SENSOR CIRCUIT ".
  12. 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 

    Fig 9: Display Checking - Intake Sensor
    G03327641Courtesy of NISSAN MOTOR CO., U.S.A.
    1. OK: GO TO 13.
    2. NG: Go to INTAKE SENSOR CIRCUIT. Refer to "INTAKE SENSOR CIRCUIT ".
  13. CHECK MULTIPLEX COMMUNICATION ERROR 
    1. Press Recirculation (REC) switch.
    2. Multiplex communication error between display and A/C auto amp. and A/C and audio controller can be detected as self-diagnosis results.

      (If plural errors occur, the display of each error will blink twice for 0.5 second intervals.)

    3. Is multiplex communication error detected as self-diagnosis results?
      Fig 10: Display Checking - Multiplex Communication Error
      G03327642Courtesy of NISSAN MOTOR CO., U.S.A.

    YES or NO

    1. YES: Go to MULTIPLEX COMMUNICATION CIRCUIT. Refer to "MULTIPLEX COMMUNICATION CIRCUIT ".
    2. NO: Go to next step.
      1. Turn ignition switch OFF or AUTO. ECON switch ON.
      2. INSPECTION END
  14. 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 performing indoors, aim a light (more than 60W) at sunload sensor, otherwise code No.25 will indicate despite that sunload sensor is functioning properly.

    MALFUNCTIONING SENSOR CHART

    Code No. Malfunctioning sensor (Including circuits) Reference
    21 / -21 Ambient sensor (2)
    22 / -22 In-vehicle sensor (3)
    24 / -24 Intake sensor (4)
    25 / -25 Sunload sensor (1) (5)
    26 / -26 With DUAL switch Air mix door motor PBR (Driver side) (6)
    Without DUAL switch Air mix door motor PBR (Passenger side)
    27 / -27 With DUAL switch only Air mix door motor PBR (Passenger side)
    (1) Perform self-diagnosis STEP-2 under sunshine.
    (2) "DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR ".
    (3) "DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR ".
    (4) "DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR ".
    (5) "DIAGNOSTIC PROCEDURE FOR SUNLOAD SENSOR ".
    (6) "DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT ".
    Fig 11: Display Checking - Malfunctioning Sensor
    G03327643Courtesy of NISSAN MOTOR CO., U.S.A.
    1. INSPECTION END
  15. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH 

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

    MALFUNCTIONING DOOR MOTOR POSITION SWITCH CHART

    Code No. (1)(2) Mode or intake door position Reference
    31 VENT Mode door motor (4)
    32 B/L 1
    33 B/L 2
    34 FOOT(3)
    35 D/F
    36 DEF
    37 FRE Intake door motor (5)
    38 20% FRE
    39 REC
    (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 ".

    (If two or more mode or intake doors are out of order, corresponding code numbers blink respectively twice.)

    Fig 12: Display Checking - Malfunctioning Door Motor Position Switch
    G03327644Courtesy of NISSAN MOTOR CO., U.S.A.
    1. INSPECTION END
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