Infiniti G37 Coupe. Manual — part 766
DIAGNOSIS SYSTEM (AUTO AMP.)
HAC-53
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code No. 25 indicates
despite that sunload sensor is functioning normally.
>> INSPECTION END
12.
CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH
Mode and/or intake door motor PBR(s) is/are malfunctioning.
(Corresponding code Nos. indicates 1 second each if two or more mode or intake door motors malfunction.)
*1: The following display pattern will appear if mode door motor harness connector is disconnected.
31
→
32
→
Return to 31
*2: The following display pattern will appear if intake door motor harness connector is disconnected.
37
→
38
→
39
→
Return to 37
>> INSPECTION END
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL
SYSTEM : CONSULT-III Function
INFOID:0000000001713980
CONSULT-III APPLICATION ITEMS
CONSULT-III can display each diagnosis item using the diagnosis test modes shown as per the following.
DATA MONITOR
SJIA1781E
Code No.
*1 *2
Mode or intake door position
Reference
31
VENT
Mode door motor
32
DEF
37
FRE
Intake door motor
38
20% FRE
39
REC
SJIA1782E
System part
Check item, diagnosis mode
Description
ECM
Data monitor
Displays ECM input data in real time.
HAC-54
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (AUTO AMP.)
Display Item List
Monitor Item
Condition
Value/Status
IGN ON SW
Ignition switch OFF
→
ON
OFF
→
ON
FAN ON SIG
Ignition switch ON
Blower fan motor switch ON
ON
Blower fan motor switch OFF
OFF
AIR COND SW
Ignition switch ON
Compressor ON
ON
Compressor OFF
OFF
REFRIGERANT PRESSURE
SENSOR
• Engine is running
• Warm-up condition
• Both A/C switch and blower fan motor switch: ON (Compressor
operates)
1.0 - 4.0 V
MODE DOOR CONTROL SYSTEM
HAC-55
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
MODE DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000001733793
System Description
INFOID:0000000001733794
The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
SYSTEM OPERATION
• The unified meter and A/C amp. receives data from each of the sensors.
• The unified meter and A/C amp. sends air mix door, mode door and intake door opening angle data to the air
mix door motor LCU(s), mode door motor LCU and intake door motor LCU.
• The air mix door motor(s), mode door motor and intake door motor read their respective signals according to
the address signal. Opening angle indication signals received from the unified meter and A/C amp. and each
of the motor position sensors are compared by the LCUs in each door motor with the existing decision and
opening angles.
• Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection data are
returned to the unified meter and A/C amp.
Door Motor Circuit
Mode Door Control Specification
JSIIA0772GB
JSIIA0773GB
HAC-56
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR CONTROL SYSTEM
Mode position can be selected manually by pressing MODE switch
or DEF switch of the preset switch. This enables to fix a mode posi-
tion. Automatic control by unified meter and A/C amp. Pressing
AUTO switch allows automatic control by unified meter and A/C
amp. During the automatic control of mode position, a mode door
position (VENT, B/L, FOOT, or D/F) is selected based on a target air
mix door opening angle and sunload depending on a temperature
calculated by unified meter and A/C amp. In addition, D/F is selected
to prevent windshield fogging only when ambient temperature is
extremely low with mode position FOOT.
RJIA1778E
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