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Infiniti EX35. Manual - part 917

HAC-64

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

- Inlet port memory function. Refer to

HAC-15, "WITH LEFT AND RIGHT VENTILATION TEMPERATURE

SEPARATELY CONTROL SYSTEM : Inlet Port Memory Function"

CONFORMATION METHOD

SET IN SELF-DIAGNOSIS MODE

Turn ignition switch ON.

Set in self-diagnosis mode as per the following. Press OFF switch for at least 5 seconds Within 10 sec-
onds after starting engine (ignition switch is turned ON).

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. Start engine before performing this
diagnosis to avoid this.

• Former STEP-1 (indicators and display screen are checked) does not exist in this self-diagnosis function.
• OFF switch may not be recognized according to the timing of pressing it. Operate OFF switch after turning

the intake switch indicators (REC/FRE) ON.

>> GO TO 2.

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

JSIIA1058GB

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

HAC-65

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

Does code No. 20 appear on the display?

YES

>> GO TO 3.

>> GO TO 11.

STEP-3: MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED

Turn temperature control dial (driver side) clockwise.

Does code No. 30 appear on the display?

YES

>> GO TO 4.

>> GO TO 12.

STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED

Turn temperature control dial (driver side) clockwise.

Press DEF (

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

indicated on the display.

>> GO TO 5.

CHECK ACTUATORS

Refer to the following chart and check discharge air flow, air temperature, blower motor duty ratio and com-
pressor operation.

Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper
operation.

SJIA1778E

SJIA1779E

SJIA1780E

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 COOL

FULL HOT

Blower motor duty ratio

37%

91%

65%

91%

Compressor (Magnet
clutch)

OFF

Electronic control valve
(ECV) duty ratio

100%

50%

100%

HAC-66

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

Without rear ventilation

With rear ventilation

Is this inspection result normal?

YES

>> GO TO 6.

NO-1

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

HAC-70, "Diagnosis Proce-

dure"

NO-2

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

HAC-78, "Diagnosis Pro-

cedure"

NO-3

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

HAC-75,

"WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM :
Diagnosis Procedure"

NO-4

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

HAC-84, "WITH

LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diag-
nosis Procedure"

NO-5

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

HAC-88, "Diagnosis Proce-

dure"

STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED

Turn temperature control dial (driver side) clockwise.

Code No. 51 appears on the display.

>> GO TO 7.

CHECK AMBIENT SENSOR

JSIIA0866GB

JSIIA0888GB

DIAGNOSIS SYSTEM (UNIFIED METER & A/C AMP.)

HAC-67

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

HAC

Press DEF (

) switch one time. Temperature detected by ambient

sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display
greatly differs from the actual temperature, and then check sensor.
Is this inspection result normal?

YES

>> GO TO 8.

>> Go to Ambient Sensor Circuit. Refer to

HAC-91, "Diag-

nosis Procedure"

CHECK IN-VEHICLE SENSOR

Press DEF (

) switch for the second time. Temperature detected

by in-vehicle sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display
greatly differs from the actual temperature, and then check sensor.

Is this inspection result normal?

YES

>> GO TO 9.

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

HAC-95, "Diag-

nosis Procedure"

CHECK INTAKE SENSOR

Press DEF (

) switch for the third time. Temperature detected by

intake sensor is indicated on the display.
NOTE:
Check sensor circuit first if the temperature indicated on the display
greatly differs from the actual temperature, and then check sensor.

Is this inspection result normal?

YES

>> GO TO 10.

>> Go to Intake Sensor Circuit. Refer to

HAC-100, "Diagno-

sis Procedure"

10.

CHECK CAN COMMUNICATION ERROR

Press intake switch.

CAN communication error between each unit that uses the uni-
fied meter and A/C amp. can be detected as self-diagnosis
results. (The display of each error will blink twice for 0.5 second
intervals if plural errors occur.)

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to CAN communication (Unified meter and A/C amp.

- AV control unit). Refer to

MWI-44,

"Diagnosis Procedure"

11.

CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR

Refer to the following chart for malfunctioning code No.
(Corresponding code Nos. indicates 1 second each if two or more sensors and door motors malfunction.)
(Corresponding code Nos. indicates 0.5 second each if two door motors malfunction.)

PJIA0151E

PJIA0152E

PJIA0153E

JSIIA0138GB

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