Nissan Frontier. Instruction — part 875
HAC-54
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
OPTICAL SENSOR
OPTICAL SENSOR
Component Description
INFOID:0000000009478298
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 front air control.
OPTICAL INPUT PROCESS
The front air control 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:0000000009478299
Regarding Wiring Diagram information, refer to
HAC-63, "Wiring Diagram - Automatic Air Conditioner"
DIAGNOSTIC PROCEDURE FOR OPTICAL SENSOR
SYMPTOM: Optical sensor circuit is open or shorted. Using the
CONSULT, DTC B257F or B2580 is displayed. Without a CONSULT,
code 50 or 52 is indicated on front air control as a result of conduct-
ing self-diagnosis.
1.
CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND FRONT AIR CONTROL
AWIIA0169ZZ
AWIIA1076GB
OPTICAL SENSOR
HAC-55
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Disconnect front air control connector and optical sensor con-
nector.
3. Check continuity between optical sensor harness connector
M14 (B) terminals 1 and 2 and front air control harness connec-
tor M56 (C) terminal 38 and M52 (A) terminal 1.
4. Check continuity between optical sensor harness connector
M14 (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
M14 (B) terminal 3 and BCM harness connector M18 (A) termi-
nal 18.
3. Check continuity between optical sensor harness connector
M14 (B) terminal 4 and ground.
Is the inspection result normal?
YES
>> Replace optical sensor. Refer to
VTL-9, "Removal and Installation"
.
NO
>> Repair harness or connector.
1 - 1
: Continuity should exist.
2 - 38
: Continuity should exist.
1, 2 - Ground
: Continuity should not exist.
AWIIA1077ZZ
3 - 18
: Continuity should exist.
3 - Ground
: Continuity should not exist.
AWIIA1078ZZ
HAC-56
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE SENSOR
INTAKE SENSOR
System Description
INFOID:0000000009478300
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 front air control.
Intake Sensor Diagnosis Procedure
INFOID:0000000009478301
Regarding Wiring Diagram information, refer to
HAC-63, "Wiring Diagram - Automatic Air Conditioner"
DIAGNOSTIC PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. Using the CON-
SULT, DTC B2581 or B2582 is displayed. Without a CONSULT, code
56 or 57 is indicated on front air control 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 FRONT AIR CONTROL
WJIA1155E
AWIIA0433GB
2 - Ground
: Approx. 5V
WJIA1375E
INTAKE SENSOR
HAC-57
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between intake sensor harness connector
M146 (B) terminal 1 and front air control harness connector M52
(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-57, "Intake Sensor Component Inspection"
.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-7, "Removal and Installation"
2. Go to
HAC-20, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
NO
>> 1. Replace intake sensor. Refer to
VTL-10, "Removal and Installation"
.
2. Go to
HAC-20, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
4.
CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between intake sensor harness connector
M146 (B) terminal 2 and front air control harness connector M52
(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 front air control. Refer to
VTL-7, "Removal and Installation"
2. Go to
HAC-20, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
NO
>> Repair harness or connector.
Intake Sensor Component Inspection
INFOID:0000000009478302
COMPONENT INSPECTION
Intake Sensor
After disconnecting intake sensor connector, measure resistance between terminals 1 and 2 at sensor har-
ness side, using the table below.
1 - 26
: Continuity should exist.
AWIIA0434ZZ
2 - 11
: Continuity should exist.
2 - Ground
: Continuity should not exist.
AWIIA0435ZZ
Temperature
°C (°F)
Resistance k
Ω
−15 (5)
209.0
−10 (14)
160.0
−5 (23)
123.0
0 (32)
95.8
5 (41)
74.9
10 (50)
58.9
15 (59)
46.7
20 (68)
37.3
25 (77)
30.0
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