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Infiniti FX35 / FX45. Manual - part 112

ATC-44

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS

Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing (fan) UP switch.

FUNCTION CONFIRMATION PROCEDURE

SET IN SELF-DIAGNOSIS MODE

Turn ignition switch ON.

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.

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

SJIA1571E

TROUBLE DIAGNOSIS

ATC-45

< SERVICE INFORMATION >

ATC

Does code No. 20 appear on the display?

YES

>> GO TO 3.

>> GO TO 13.

CHECK TO ADVANCE SELF-DIAGNOSIS STEP-3

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

Advance to self-diagnosis STEP-3?

YES

>> GO TO 4.

>> Replace A/C and AV switch. (Temperature control switch is malfunctioning.)

CHECK TO RETURN SELF-DIAGNOSIS STEP-2

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

Return to self-diagnosis STEP-2?

YES

>> GO TO 5.

>> Malfunctioning A/C and AV switch or unified meter and A/C amp. Refer to

ATC-84, "Self-Diagno-

sis"

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.

>> GO TO 14.

STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED

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

Press

(DEF) switch. Code No. of each door motor test is

indicated on the display.

>> GO TO 7.

CHECK ACTUATORS

SJIA1778E

SJIA1779E

SJIA1780E

ATC-46

< SERVICE INFORMATION >

TROUBLE DIAGNOSIS

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

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

>> GO TO 8.

>> • Air outlet does not change.

Go to Mode Door Motor Circuit. Refer to

ATC-57, "Mode Door Motor Circuit"

• Intake door does not change.

Go to Intake Door Motor Circuit. Refer to

ATC-62, "Intake Door Motor Circuit"

• Discharge air temperature does not change.

Go to Air Mix Door Motor Circuit. Refer to

ATC-59, "Air Mix Door Motor Circuit"

• Blower motor operation is malfunctioning.

Go to Blower Motor Circuit. Refer to

ATC-64, "Blower Motor Circuit"

• Magnet clutch does not engage.

Go to Magnet Clutch Circuit. Refer to

ATC-69, "Magnet Clutch Circuit"

STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED

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

Code No. 51 appears on the display.

>> GO TO 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

>> GO TO 10.

>> Go to Ambient Sensor Circuit. Refer to

ATC-86, "Ambi-

ent Sensor Circuit"

SJIA0302E

Code No.

Mode door position

VENT

B/L 1

B/L 2

FOOT

D/F

DEF

Intake door position

REC

20% FRE

FRE

Air mix door position

FULL COLD

FULL HOT

Blower motor duty ratio

37%

91%

65%

91%

Compressor

OFF

Electronic control valve
(ECV) duty ratio

100%

50%

100%

PJIA0151E

TROUBLE DIAGNOSIS

ATC-47

< SERVICE INFORMATION >

ATC

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

>> GO TO 11.

>> Go to In-vehicle Sensor Circuit. Refer to

ATC-88, "In-

vehicle Sensor Circuit"

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

>> GO TO 12.

>> Go to Intake Sensor Circuit. Refer to

ATC-94, "Intake

Sensor Circuit"

12.

CHECK CAN COMMUNICATION ERROR

Press intake switch.

CAN communication error between the unified meter and A/C
amp. and the display control unit can be detected as self-diag-
nosis results. (If plural errors occur, the display of each error will
blink twice for 0.5 second intervals.)

OK or NG

>> 1.

Turn ignition switch OFF or AUTO switch ON.

INSPECTION END

Go to CAN communication. Refer to

BCS-11, "CON-

SULT-III Function (BCM)"

• Unified meter and A/C amp. - Display control unit

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.)

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

PJIA0152E

PJIA0153E

SJIA1611E

Code No.

Malfunctioning sensor and door motor (Including circuits)

Reference page

21 /

−

Ambient sensor

ATC-86, "Ambient Sensor Circuit"

22 /