Infiniti M35/M45 Y50. Manual — part 127

TROUBLE DIAGNOSIS

ATC-59

C

D

E

F

G

H

I

K

L

M

A

B

ATC

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

ATC-64, "AUXILIARY MECHANISM: FOOT POSITION

SETTING TRIMMER"

.

OK or NG

OK

>> GO TO 8.

NG

>>

●

Air outlet does not change.
Go to Mode Door Motor Circuit. Refer to

ATC-76, "Mode Door Motor Circuit"

.

●

Upper ventilator outlet does not change.
Go to Upper Ventilator Door Motor Circuit. Refer to

ATC-79, "Upper Ventilator Door Motor Cir-

cuit"

.

●

Intake door does not change.
Go to Intake Door Motor Circuit. Refer to

ATC-85, "Intake Door Motor Circuit"

.

●

Discharge air temperature does not change.
Go to Air Mix Door Motor Circuit. Refer to

ATC-82, "Air Mix Door Motor Circuit"

.

●

Blower motor operation is malfunctioning.
Go to Blower Motor Circuit. Refer to

ATC-88, "Blower Motor Circuit"

.

●

Magnet clutch does not engage.
Go to Magnet Clutch Circuit. Refer to

ATC-93, "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

ATC-112, "Ambi-

ent Sensor Circuit"

.

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

ATC-115, "In-

vehicle Sensor Circuit"

.

PJIA0151E

PJIA0152E

ATC-60

TROUBLE DIAGNOSIS

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

ATC-121, "Intake

Sensor Circuit"

.

12.

CHECK CAN COMMUNICATION ERROR

1.

Press intake switch.

2.

CAN communication error between each unit that uses the uni-
fied 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

DI-35, "DTC

[U1000] CAN Communication Circuit"

.

●

Unified meter and A/C amp. - AV control unit or NAVI
control unit

PJIA0153E

SJIA1763E

TROUBLE DIAGNOSIS

ATC-61

C

D

E

F

G

H

I

K

L

M

A

B

ATC

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.

*2:

ATC-112, "DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR"

.

*3:

ATC-116, "DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR"

.

*4:

ATC-121, "DIAGNOSIS PROCEDURE FOR INTAKE SENSOR"

.

*5:

ATC-118, "DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR"

.

*6:

ATC-84, "DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR"

.

>> INSPECTION END

Code No.

Malfunctioning sensor and door motor (Including circuits)

Reference page

21 /

−

21

Ambient sensor

*2

22 /

−

22

In-vehicle sensor

*3

24 /

−

24

Intake sensor

*4

25 /

−

25

Sunload sensor

*1

*5

26 /

−

26

Air mix door motor PBR (Driver side)

*6

27 /

−

27

Air mix door motor PBR (Passenger side)

SJIA1781E

ATC-62

TROUBLE DIAGNOSIS

14.

CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH

Door motor PBR is malfunctioning.

(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

*4:

ATC-78, "DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR"

.

*5:

ATC-81, "DIAGNOSIS PROCEDURE FOR UPPER VENTILATOR DOOR MOTOR"

.

*6:

ATC-87, "DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR"

.

>> INSPECTION END

Code No.

*1 *2 *3

Door position

Reference page

31

VENT (Driver side)

Mode door motor

*4

32

DEF (Driver side)

33

VENT (Passenger side)

34

DEF (Passenger side)

35

UPPER VENT (Open)

Upper ventilator door

motor

*5

36

UPPER VENT (Shut)

37

FRE

Intake door motor

*6

38

20% FRE

39

REC

SJIA1782E