Infiniti G37 Coupe. Manual — part 765
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DIAGNOSIS SYSTEM (AUTO AMP.)
HAC-49
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Shifting from STEP-5 to AUXILIARY MECHANISM is accomplished by means of pressing fan (UP:+) switch.
CONFORMATION METHOD
1.
SET IN SELF-DIAGNOSIS MODE
1.
Turn ignition switch ON.
2.
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 (LEDs 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 LEDs (REC/FRE) ON.
>> GO TO 2.
2.
STEP-2: SENSOR AND DOOR MOTOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT
JSIIA0771GB
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HAC-50
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (AUTO AMP.)
Does code No. 20 appear on the display?
YES
>> GO TO 3.
NO
>> GO TO 11.
3.
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.
NO
>> GO TO 12.
4.
STEP-4: OPERATION OF EACH DOOR MOTOR IS CHECKED
1.
Turn temperature control dial (driver side) clockwise.
2.
Press DEF (
) switch. Code No. of each door motor test is
indicated on the display.
>> GO TO 5.
5.
CHECK ACTUATORS
Refer to the following chart and check discharge air flow, air temperature, blower motor duty ratio and com-
pressor operation.
SJIA1778E
SJIA1779E
SJIA1780E
JSIIA0866GB
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DIAGNOSIS SYSTEM (AUTO AMP.)
HAC-51
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Checks must be made visually, by listening the sound, or by touching air outlets with hand, etc. for improper
operation.
Is this inspection result normal?
YES
>> GO TO 6.
NO-1
>> Air outlet does not change. Go to Mode Door Motor Circuit. Refer to
.
NO-2
>> Intake door does not change. Go to Intake Door Motor Circuit. Refer to
NO-3
>> Discharge air temperature does not change. Go to Air Mix Door Motor Circuit. Refer to
"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
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
.
6.
STEP-5: TEMPERATURE OF EACH SENSOR IS CHECKED
1.
Turn temperature control dial (driver side) clockwise.
2.
Code No. 51 appears on the display.
>> GO TO 7.
7.
CHECK AMBIENT SENSOR
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.
NO
>> Go to Ambient Sensor Circuit. Refer to
.
8.
CHECK IN-VEHICLE SENSOR
Code No.
41
42
43
44
45
46
Mode door position
VENT
B/L 1
B/L 2
FOOT
D/F
DEF
Intake door position
REC
REC
20% FRE
FRE
FRE
FRE
Air mix door position
FULL COOL
FULL COOL
FULL HOT
FULL HOT
FULL HOT
FULL HOT
Blower motor duty ratio
37%
91%
65%
65%
65%
91%
Compressor (Magnet
clutch)
ON
ON
OFF
OFF
ON
ON
Electronic control valve
(ECV) duty ratio
100%
100%
0%
0%
50%
100%
PJIA0151E
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HAC-52
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (AUTO AMP.)
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.
NO
>> Go to In-vehicle Sensor Circuit. Refer to
.
9.
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.
NO
>> Go to Intake Sensor Circuit. Refer to
10.
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. (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
NO
>> Go to CAN communication (Unified meter and A/C amp.
- AV control unit). Refer to
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.)
*: Perform self-diagnosis STEP-2 under sunshine.
PJIA0152E
PJIA0153E
JSIIA0138GB
Code No.
Malfunctioning sensor and door motor (Including circuits)
Reference
21 /
−
21
Ambient sensor
22 /
−
22
In-vehicle sensor
24 /
−
24
Intake sensor
25 /
−
25
Sunload sensor
*
26 /
−
26
Air mix door motor PBR (Driver side)
HAC-72, "WITH LEFT AND RIGHT VENTILA-
TION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : Diagnosis Procedure"
27 /
−
27
Air mix door motor PBR (Passenger side)
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