Infiniti QX56 (JA60). Manual — part 606
OPTICAL SENSOR
HAC-81
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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OPTICAL SENSOR
Component Description
INFOID:0000000005147724
COMPONENT DESCRIPTION
The optical sensor (1) is located in the center of the defroster grille. It
detects sunload entering through windshield by means of a photo
diode. The sensor converts the sunload into a current value which is
then input into the A/C auto amp.
OPTICAL INPUT PROCESS
The A/C auto amp. includes a processing circuit which averages the variations in detected sunload over a
period of time. This prevents adjustments in the ATC system operation due to small or quick variations in
detected sunload.
For example, consider driving along a road bordered by an occasional group of large trees. The sunload
detected by the optical sensor will vary whenever the trees obstruct the sunlight. The processing circuit aver-
ages the detected sunload over a period of time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the ATC system operation. On the other hand, shortly
after entering a long tunnel, the system will recognize the change in sunload, and the system will react accord-
ingly.
Optical Sensor Diagnosis Procedure
INFOID:0000000005147725
Regarding Wiring Diagram information, refer to
DIAGNOSTIC PROCEDURE FOR OPTICAL SENSOR
SYMPTOM: Optical sensor circuit is open or shorted. Using the
CONSULT-III, DTC B257F or B2580 is displayed. Without a CON-
SULT-III, code 50 or 52 is indicated on A/C auto amp. as a result of
conducting self-diagnosis.
1.
CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND A/C AUTO AMP.
AWIIA0169ZZ
AWIIA1067GB
HAC-82
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
OPTICAL SENSOR
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector and optical sensor connec-
tor.
3. Check continuity between optical sensor harness connector
M302 (B) terminals 1 and 2 and A/C auto amp. harness connec-
tor M50 (C) terminal 42 and M49 (A) terminal 1.
4. Check continuity between optical sensor harness connector
M302 (B) terminal 1 and 2 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector.
2.
CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND BCM
1. Disconnect BCM connector.
2. Check continuity between optical sensor harness connector
M302 (B) terminal 3 and BCM harness connector M18 (A) termi-
nal 18.
3. Check continuity between optical sensor harness connector
M302 (B) terminal 3 and ground.
Is the inspection result normal?
YES
>> Replace optical sensor. Refer to
VTL-10, "Removal and Installation"
.
NO
>> Repair harness or connector.
1 - 1
: Continuity should exist.
2 - 42
: Continuity should exist.
1, 2 - Ground.
: Continuity should not exist.
AWIIA1085ZZ
3 - 18
: Continuity should exist.
3 - Ground
: Continuity should not exist.
AWIIA1078ZZ
INTAKE SENSOR
HAC-83
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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INTAKE SENSOR
System Description
INFOID:0000000005147726
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit assembly. It
converts temperature of air after if passes through the evaporator
into a resistance value which is then input to the A/C auto amp.
Intake Sensor Diagnosis Procedure
INFOID:0000000005147727
Regarding Wiring Diagram information, refer to
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. Using the CON-
SULT-III, DTC B2581 or B2582 is displayed. Without a CONSULT-III,
code 56 or 57 is indicated on A/C auto amp. as a result of conducting
self-diagnosis.
1.
CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND
1. Disconnect intake sensor connector.
2. Turn ignition switch ON.
3. Check voltage between intake sensor harness connector M146
terminal 2 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND A/C AUTO AMP.
WJIA0571E
AWIIA0208GB
2 - Ground
: Approx. 5V
WJIA1375E
HAC-84
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE SENSOR
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between intake sensor harness connector
M146 (B) terminal 1 and A/C auto amp. harness connector M49
(A) terminal 26.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK INTAKE SENSOR
Check intake sensor. Refer to
HAC-84, "Intake Sensor Component Inspection"
.
Is the inspection result normal?
YES
>> 1. Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
2. Go to
HAC-23, "A/C Auto Amp. Self-Diagnosis"
and perform self-diagnosis.
NO
>> 1. Replace intake sensor. Refer to
VTL-11, "Removal and Installation"
.
2. Go to
HAC-23, "A/C Auto Amp. Self-Diagnosis"
and perform self-diagnosis.
4.
CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between intake sensor harness connector
M146 (B) terminal 2 and A/C auto amp. harness connector M49
(A) terminal 11.
4. Check continuity between intake sensor harness connector
M146 (B) terminal 2 and ground.
Is the inspection result normal?
YES
>> 1. Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
2. Go to
HAC-23, "A/C Auto Amp. Self-Diagnosis"
and perform self-diagnosis.
NO
>> Repair harness or connector.
Intake Sensor Component Inspection
INFOID:0000000005147728
COMPONENT INSPECTION
Intake Sensor
1 - 26
: Continuity should exist.
AWIIA0209ZZ
2 - 11
: Continuity should exist.
2 - Ground
: Continuity should not exist.
AWIIA0216ZZ
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