Infiniti FX35, FX50 (S51). Manual — part 1168
UNIFIED METER AND A/C AMP.
HAC-69
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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UNIFIED METER AND A/C AMP.
Description
INFOID:0000000005246248
COMPONENT DESCRIPTION
Unified Meter and A/C Amp. (Automatic Amplifier)
The unified meter and A/C amp. (1) has a built-in microcomputer
which processes information sent from various sensors needed for
air conditioner operation. The air mix door motors, mode door motor,
intake door motor, blower motor and compressor are then controlled.
When the various switches and temperature control dial are oper-
ated, data is input to the unified meter and A/C amp. from the AV
control unit using CAN communication.
Self-diagnosis functions are also built into unified meter and A/C
amp. to provide quick check of malfunctions in the auto air condi-
tioner system.
Component Function Check
INFOID:0000000005246249
1.
CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK
1.
Press AUTO switch.
2.
Display should indicate AUTO. Confirm that the compressor clutch engages (sound or visual inspection).
(Discharge air and blower speed depend on ambient, in-vehicle and set temperatures.)
Does magnet clutch engaged?
YES
>> INSPECTION END
NO
>> Go to Diagnosis Procedure. Refer to
.
Diagnosis Procedure
INFOID:0000000005246250
1.
INSPECTION BY FAIL-SAFE FUNCTION
1.
Turn the ignition switch ON.
2.
After approximately 30 seconds, check that the air conditioner is operated by the fail-safe function (the
operation display of air conditioner is not performed). Refer to
Is the fail-safe function operated?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK UNIFIED METER AND A/C AMP. POWER SUPPLY CIRCUIT AND GROUND
Check unified meter and A/C amp. power supply circuit and ground circuit. Refer to
METER AND A/C AMP. : Diagnosis Procedure"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace parts according to the inspection results.
3.
CHECK PRESET SWITCH
Check preset switch. Refer to
(WITHOUT NAVIGATION),
[NAVIGATION (SINGLE MONITOR)] or
[NAVIGATION (TWIN MONITOR)].
Is the inspection result normal?
YES
>> Replace unified meter and A/C amp.
NO
>> Repair or replace malfunctioning part(s).
JSIIA1290ZZ
HAC-70
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
MODE DOOR MOTOR
Description
INFOID:0000000005246251
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor (1) are attached to the heater & cooling unit
assembly. It rotates so that air is discharged from the outlet set by
the unified meter and A/C amp. Motor rotation is conveyed to a link
which activates the mode door.
Component Function Check
INFOID:0000000005246252
1.
CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK
1.
Press MODE switch and DEF switch.
2.
Each position indicator should change shape.
3.
Confirm that discharge air comes out according to the air distribution table at below. Refer to
"WITHOUT ACCS : System Description"
HAC-33, "WITH ACCS : System Descrip-
(WITH ACCS).
NOTE:
Confirm that the compressor clutch is engaged (Sound or visual inspection) and intake door position is at FRE
when DEF
or D/F
is selected.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to diagnosis procedure. Refer to
Diagnosis Procedure
INFOID:0000000005246253
1.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis function. Refer to
HAC-57, "WITHOUT ACCS : Diagnosis Description"
(WITHOUT
ACCS) or
HAC-62, "WITH ACCS : Diagnosis Description"
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK POWER SUPPLY FOR MODE DOOR MOTOR
Check voltage between mode door motor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK SIGNAL FOR MODE DOOR MOTOR
Confirm A/C LAN signal between mode door motor harness connector and ground using an oscilloscope.
:
Vehicle front
JSIIA0005GB
(+)
(
−
)
Voltage
(Approx.)
Mode door motor
—
Connector
Terminal
M253
1
Ground
12 V
MODE DOOR MOTOR
HAC-71
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK MODE DOOR MOTOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect mode door motor connector.
3.
Check continuity between mode door motor harness connector and ground.
Is the inspection result normal?
YES
>> Replace mode door motor.
NO
>> Repair harness or connector.
5.
CHECK MODE DOOR CONTROL LINKAGE
Check mode door control linkage is properly installed. Refer to
.
Is it installed normally?
YES
>> INSPECTION END
NO
>> Repair or adjust control linkage.
(+)
(
−
)
Voltage
Mode door motor
—
Connector
Terminal
M253
3
Ground
SJIA1453J
Mode door motor
—
Continuity
Connector
Terminal
M253
2
Ground
Existed
HAC-72
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR MOTOR (DRIVER SIDE)
AIR MIX DOOR MOTOR (DRIVER SIDE)
Description
INFOID:0000000005246254
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor (driver side) (1) is attached to the heater &
cooling unit assembly. It rotates so that the air mix door is opened or
closed to a position set by the unified meter and A/C amp. Motor
rotation is then conveyed through a shaft and the air mix door posi-
tion feedback is then sent to the unified meter and A/C amp. by PBR
built-in air mix door motor.
Component Function Check
INFOID:0000000005246255
1.
CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK
1.
Turn temperature control dial (driver side) clockwise until 32.0
°
C (90
°
F) is displayed.
2.
Check for warm air at discharge air outlets.
3.
Turn temperature control dial (driver side) counterclockwise until 18.0
°
C (60
°
F) is displayed.
4.
Check for cool air at discharge air outlets.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to diagnosis procedure. Refer to
Diagnosis Procedure
INFOID:0000000005246256
1.
PERFORM SELF-DIAGNOSIS
Perform self-diagnosis function. Refer to
HAC-57, "WITHOUT ACCS : Diagnosis Description"
(WITHOUT
ACCS) or
HAC-62, "WITH ACCS : Diagnosis Description"
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK POWER SUPPLY FOR AIR MIX DOOR MOTOR (DRIVER SIDE)
Check voltage between air mix door motor (driver side) harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK SIGNAL FOR AIR MIX DOOR MOTOR (DRIVER SIDE)
Confirm A/C LAN signal between air mix door motor (driver side) harness connector and ground using an
oscilloscope.
:
Vehicle front
JSIIA1370ZZ
(+)
(
−
)
Voltage
(Approx.)
Air mix door motor (driver side)
—
Connector
Terminal
M252
1
Ground
12 V
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