Function Confirmation Procedure

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

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 normal. To avoid this, start engine before performing this diagnosis.
  
  : GO TO 2.
STEP-1: LEDS AND DISPLAY ARE CHECKED
Check LED illumination and display screen.

Fig 1: Viewing A/C System Display Screen
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Identifying Illuminating LEDs
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 3.
2. NG: Malfunctioning OFF switch, LED or auto amp. Refer to SELF-DIAGNOSIS .
CHECK TO ADVANCE SELF-DIAGNOSIS STEP-2
Turn the temperature dial (driver side) clockwise.

Advance to self-diagnosis STEP-2?
1. YES: GO TO 4.
2. NO: Replace multifunction switch. (Temperature dial malfunctions.)
CHECK TO RETURN SELF-DIAGNOSIS STEP-1
Turn the temperature dial (driver side) counterclockwise.

Return to self-diagnosis STEP-1?
1. YES: GO TO 5.
2. NO: Replace multifunction switch. (Temperature dial malfunctions.)
STEP-2: SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
Turn the temperature dial (driver side) clockwise.

Does code No. 20 appear on the display?
1. YES: GO TO 6.
2. NO: GO TO 14.
  
  Fig 3: Identifying Sensor Circuits Display Code
  Courtesy of NISSAN MOTOR CO., U.S.A.
STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED
Turn the temperature dial (driver side) clockwise.

Does code No. 30 appear on the display?
1. YES: GO TO 7.
2. NO: GO TO 15.
  
  Fig 4: Viewing Mode Door & Intake Door Display Code
  Courtesy of NISSAN MOTOR CO., U.S.A.
STEP-4: OPERATION OF EACH ACTUATOR IS CHECKED
1. Turn the temperature dial (driver side) clockwise.
2. Press (DEF) switch, code No. of each actuator test is indicated on the display.
  : GO TO 8.
  
  Fig 5: Viewing Actuator Test Display Code
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK ACTUATORS
Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and compressor operation.

Fig 6: Identifying Various Mode Position Selections
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 7: Confirming A/C System Parameters Based On Mode Position Selection
Courtesy of NISSAN MOTOR CO., U.S.A.

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:
- Air outlet does not change.
  Go to Mode Door Motor Circuit. Refer to MODE DOOR MOTOR CIRCUIT .
- Intake door does not change.
  Go to Intake Door Motor Circuit. Refer to INTAKE DOOR MOTOR CIRCUIT .
- Blower motor operation is malfunctioning.
  Go to Blower Motor Circuit. Refer to BLOWER MOTOR CIRCUIT .
- Magnet clutch does not engage.
  Go to Magnet Clutch Circuit Refer to MAGNET CLUTCH CIRCUIT .
- Discharge air temperature does not change.
  Go to Air Mix Door Motor Circuit. Refer to AIR MIX DOOR MOTOR CIRCUIT .
STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1. Turn the temperature dial (driver side) clockwise.
2. Code No. 51 appears on the display.
  : GO TO 10.
CHECK AMBIENT SENSOR
Press (DEF) switch one time, temperature detected by ambient sensor is indicated on the display.

Fig 8: Viewing Ambient Sensor Display
Courtesy of NISSAN MOTOR CO., U.S.A.

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 Ambient Sensor Circuit. Refer to AMBIENT SENSOR CIRCUIT .
CHECK IN-VEHICLE SENSOR
Press (DEF) switch second time, temperature detected by in-vehicle sensor is indicated on the display.

Fig 9: Viewing In-Vehicle Sensor Display
Courtesy of NISSAN MOTOR CO., U.S.A.

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 In-Vehicle Sensor Circuit. Refer to IN-VEHICLE SENSOR CIRCUIT .
CHECK INTAKE SENSOR
Press (DEF) switch the third time, temperature detected by intake sensor is indicated on the display.

Fig 10: Viewing Intake Sensor Display
Courtesy of NISSAN MOTOR CO., U.S.A.

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 13.
2. NG: Go to Intake Sensor Circuit. Refer to INTAKE SENSOR CIRCUIT .
CHECK MULTIPLEX COMMUNICATION ERROR
1. Press intake switch.
2. Multiplex communication error between AV C/U (AV and NAVI C/U) and auto amp. is detected. (If plural errors occur, the display of each error will blink two times for 0.5 second intervals.)
  
  Fig 11: Viewing Multiplex Communication Display
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Is multiplex communication error detected as self-diagnosis results?
YES OR NO
1. YES: Go to Multiplex Communication Circuit. Refer to MULTIPLEX COMMUNICATION CIRCUIT
2. NO:
  1. Turn ignition switch OFF or AUTO switch ON
  2. INSPECTION END
CHECK MALFUNCTIONING SENSOR
Refer to Fig 12& Fig 13 for malfunctioning code No.

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

INSPECTION END