Nissan Titan A60. Instruction — part 594
IN-VEHICLE SENSOR
HAC-59
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
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HAC
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IN-VEHICLE SENSOR
Component Description
INFOID:0000000006164711
COMPONENT DESCRIPTION
In-vehicle Sensor
The in-vehicle sensor (1) is located on the lower instrument panel
LH. It converts variations in temperature of passenger compartment
air (drawn in through the integrated fan) into a resistance value. It is
then input into the front air control.
In-Vehicle Sensor Diagnosis Procedure
INFOID:0000000006164712
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR
SYMPTOM: In-vehicle sensor circuit is open or shorted. Using the
CONSULT-III, DTC B2578 or B2579 is displayed. Without a CON-
SULT-III, code 30, 31 is indicated on front air control as a result of
conducting self-diagnosis.
1.
CHECK IN-VEHICLE SENSOR CIRCUIT
Is self-diagnosis DTC B2578 or B2579 (with CONSULT-III) or code 30, 31 (without CONSULT-III) present?
YES or NO?
YES
>> GO TO 6.
NO
>> GO TO 2.
2.
CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND
AWIIA0425ZZ
AWIIA0165ZZ
AWIIA0426GB
HAC-60
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
IN-VEHICLE SENSOR
1. Disconnect in-vehicle sensor connector.
2. Turn ignition switch ON.
3. Check voltage between in-vehicle sensor harness connector
M32 terminal 4 and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector M49.
3. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 1 and front air control harness connector M49
(A) terminal 26.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. Refer to
HAC-61, "In-Vehicle Sensor Component Inspection"
.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
2. Go to
HAC-21, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
NO
>> 1. Replace in-vehicle sensor. Refer to
VTL-9, "Removal and Installation"
.
2. Go to
HAC-21, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
5.
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front air control connector.
3. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 4 and front air control harness connector M50
(A) terminal 32.
4. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 4 and ground.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
2. Go to
HAC-21, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
NO
>> Repair harness or connector.
6.
CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR MOTOR AND FRONT AIR CONTROL
(SELF-DIAGNOSIS CODES 30, 31, 44, 46 OR DTC B2578, B2579)
4 - Ground
: Approx. 5V.
LJIA0089E
1 - 26
: Continuity should exist.
AWIIA0427ZZ
4 - 32
: Continuity should exist.
4 - Ground
Continuity should not exist.
AWIIA0428ZZ
IN-VEHICLE SENSOR
HAC-61
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
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A
B
HAC
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1. Turn ignition switch OFF.
2. Disconnect front air control connector and in-vehicle sensor con-
nector.
3. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 3 and front air control harness connector M50
(A) terminal 31.
4. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 3 and ground.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
2. Go to
HAC-21, "Front Air Control Self-Diagnosis"
and perform self-diagnosis.
NO
>> Repair harness or connector.
In-Vehicle Sensor Component Inspection
INFOID:0000000006164713
COMPONENT INSPECTION
In-vehicle Sensor
After disconnecting in-vehicle sensor connector M32, measure resis-
tance between terminals 1 and 4 at sensor component side, using
the table below.
If NG, replace in-vehicle sensor. Refer to
3 - 31
: Continuity should exist.
2 - Ground
: Continuity should exist.
3 - Ground
: Continuity should not exist.
AWIIA0429ZZ
Temperature
°C (°F)
Resistance k
Ω
−15 (5)
21.40
−10 (14)
16.15
−5 (23)
12.29
0 (32)
9.41
5 (41)
7.27
10 (50)
5.66
15 (59)
4.45
20 (68)
3.51
25 (77)
2.79
30 (86)
2.24
35 (95)
1.80
40 (104)
1.45
45 (113)
1.18
AWIIA0430ZZ
HAC-62
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
OPTICAL SENSOR
OPTICAL SENSOR
Component Description
INFOID:0000000006164714
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:0000000006164715
Regarding Wiring Diagram information, refer to
HAC-71, "Wiring Diagram - Automatic Air Conditioner"
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 front air control as a result of
conducting self-diagnosis.
1.
CHECK CIRCUIT CONTINUITY BETWEEN OPTICAL SENSOR AND FRONT AIR CONTROL
AWIIA0169ZZ
AWIIA1076GB
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