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Function Confirmation Procedure

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
  1. ENTER SELF-DIAGNOSTIC MODE 

    Perform steps 1 - 3.

    1. Turn the ignition switch OFF.
    2. Start the engine.
    3. Immediately after starting the engine press and hold the OFF switch (for the auto A/C system) for at least 5 seconds.

    The A/C Auto Amp. should now be in Self-Diagnosis mode. Self-Diagnosis steps 1 - 5 can now be performed. Self-Diagnosis step 1 will be displayed first. Shifting from one step to another is accomplished by turning the TEMP dial.

    1. : GO TO 2.
  2. STEP 1 - DISPLAY CHECK 

    Verify all segments illuminate.

    If all segments do not illuminate the fluorescent display tube is malfunctioning or the system has not entered self-diagnosis which would indicate a malfunctioning OFF switch.

    Do all segments illuminate?

    Fig 1: Checking Display Malfunction
    G02162361Courtesy of NISSAN MOTOR CO., U.S.A.

    Yes or No 

    1. Yes: GO TO 3.
    2. No:
      • Malfunctioning OFF switch, LED or fluorescent display tube.
      • Replace A/C auto amp.
  3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP 2 
    1. Turn the TEMP dial clockwise.
    2. Advance to self-diagnosis STEP 2.

    If the system does not shift between step 1 and 2, a malfunctioning TEMP dial is indicated.

    Yes or No 

    1. Yes: GO TO 4.
    2. No:
      • Malfunctioning TEMP dial.
      • Replace A/C auto amp.
  4. CHECK TO RETURN SELF-DIAGNOSIS STEP 1 
    1. Turn the TEMP dial counterclockwise.
    2. Return to self-diagnosis STEP 1.

    If the system does not shift between step 1 and 2, a malfunctioning TEMP dial is indicated.

    Yes or No 

    1. Yes: GO TO 5.
    2. No:
      • Malfunctioning TEMP dial.
      • Replace A/C auto amp.
  5. STEP 2 - SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT 

    Turn the TEMP dial clockwise, advance to STEP 2: Wait (about 25 seconds) for two digit Code to appear. This is the Electronic Sensor Input Check which includes circuits.

    Does code No. 20 appear on the display?

    Yes or No 

    1. Yes: GO TO 6.
    2. No: GO TO  13.
    Fig 2: Displaying Code No 20
    G02162362Courtesy of NISSAN MOTOR CO., U.S.A.
  6. STEP 3 - MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED 

    Turn the TEMP dial clockwise, advance to STEP 3. Wait (about 50 seconds; for two digit code to appear. This is the Mode Door and Intake Door Position Switch input checks including circuits.

    Does code No. 30 appear on the display?

    Yes or No 

    1. Yes: GO TO 7.
    2. No: GO TO  14.
    Fig 3: Displaying Code No 30
    G02162363Courtesy of NISSAN MOTOR CO., U.S.A.
  7. STEP 4 - OPERATION OF EACH ACTUATOR IS CHECKED 

    Turn the TEMP dial clockwise, advance to STEP 4.

    Engine running.

    This is Heater and A/C system check. Code 41 will be displayed. Use the DEF switch to advance the code number from 41 to 46. After 46, the display will return to code 41 and can be advanced to 46 again.

    1. : GO TO 8.
    Fig 4: Displaying Code No 41
    G02162364Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK ACTUATORS 

    Confirm operation of system components according to the following charts.

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

    Fig 5: Checking Actuators Operation
    G02162365Courtesy of NISSAN MOTOR CO., U.S.A.

    Operating condition of each actuator cannot be checked by indicators. 

    Discharge air flow

    Fig 6: Checking Discharge Airflow
    G02162366Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 9.
    2. NG:
  9. STEP 5 - TEMPERATURE OF EACH SENSOR IS CHECKED 

    Turn the TEMP dial clockwise, advance to STEP 5. This is Intake sensor, In Vehicle sensor and Ambient Sensor function check. Code 51 will be displayed.

    NOTE: Each sensor reading should be approximately the actual temperature.
    1. : GO TO 10.
    Fig 7: Displaying Code No 51
    G02162367Courtesy of NISSAN MOTOR CO., U.S.A.
  10. CHECK AMBIENT SENSOR 

    Press (DEF) once, temperature detected by the Ambient Sensor is displayed.

    OK or NG 

    1. OK: GO TO 11.
    2. NG: GO TO "AMBIENT SENSOR CIRCUIT "
    Fig 8: Displaying Ambient Sensor Detected Temperature
    G02162368Courtesy of NISSAN MOTOR CO., U.S.A.
  11. CHECK IN-VEHICLE SENSOR 

    Press (DEF) second time, temperature detected by the In-Vehicle Sensor is displayed.

    OK or NG 

    1. OK: GO TO 12.
    2. NG: GO TO " 4" of Ambient Sensor Circuit DIAGNOSTIC PROCEDURE.
    Fig 9: Displaying In-Vehicle Sensor Detected Temperature
    G02162369Courtesy of NISSAN MOTOR CO., U.S.A.
  12. CHECK INTAKE SENSOR 

    Press (DEF) third time, temperature detected by the Intake Sensor is displayed.

    OK or NG 

    1. OK:
      1. Press (DEF) switch the fourth time. Display returns to original presentation 51.
      2. Turn ignition switch OFF or "AUTO" (AUTO) switch ON.
      3. END
    2. NG: GO TO "INTAKE SENSOR ".
    Fig 10: Displaying Intake Sensor Detected Temperature
    G02162370Courtesy of NISSAN MOTOR CO., U.S.A.
  13. CHECK MALFUNCTIONING SENSOR 
    NOTE:
    • A blinking mark (-) preceding the Code No. indicates a short circuit.
    • No blinking mark (-) preceding the Code No. indicates an open circuit.
    • If 2 or more items are malfunctioning the corresponding codes will alternately blink twice.
    • A circuit will be detected as open or shorted and its code No. will be displayed when input signals correspond with conditions in the following chart.
    Fig 11: Malfunctioning Sensor Check Table
    G02162371Courtesy of NISSAN MOTOR CO., U.S.A.

    When conducting indoors, direct light (more than 60W) at sunload sensor.

    Fig 12: Sensor Display (When Sensor Malfunctions) (1 Of 2)
    G02162372Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 13: Sensor Display (When Sensor Malfunctions) (2 Of 2)
    G02162373Courtesy of NISSAN MOTOR CO., U.S.A.
    1. : INSPECTION END
  14. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH 
    1. 30- Mode door and intake door position switches are in working order. Continue to next step.
    2. 31- Mode door circuit / switch in vent position switch is malfunctioning.
    3. 32- Mode door circuit / switch in B/L position switch is malfunctioning.
    4. 34- Mode door circuit / switch in Foot position switch is malfunctioning.
    5. 35- Mode door circuit / switch in Foot Def. position switch is malfunctioning.
    6. 36- Mode door circuit / switch in Def. position switch is malfunctioning.
    7. 37- Intake door mode circuit / switch in Fresh Air position is malfunctioning.
    8. 38- 30- Intake door mode circuit / switch in 20% Fresh Air position is malfunctioning.
    9. 39- Intake door mode circuit / switch in Recirculation Air position is malfunctioning.
    NOTE:
    • If 2 or more items are malfunctioning the corresponding codes will alternately blink twice.
    • If the Mode Door Motor harness is disconnected repeated display pattern of 31 --> 32 --> 34 --> 35 --> 36 will occur.
    • If Intake Door Motor harness is disconnected related display pattern of 37 --> 38 --> 39 will occur.
    • If any Mode Door Motor Position Switch is malfunctioning the Mode Door Motor will also malfunction.
    Fig 14: Displaying (When A Door Is Out Of Order) (1 Of 2)
    G02162374Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 15: Displaying (When A Door Is Out Of Order) (2 Of 2)
    G02162375Courtesy of NISSAN MOTOR CO., U.S.A.
    1. : INSPECTION END
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