Nissan Altima L32. Instruction — part 820
HAC-54
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
IN-VEHICLE SENSOR
1.
CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR HARNESS CONNECTOR AND BODY GROUND
1. Disconnect in-vehicle sensor connector M34.
2. Press ignition switch ON.
3. Check voltage between in-vehicle sensor harness connector
M34 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2
NO
>> GO TO 4
2.
CHECK IN-VEHICLE SENSOR GROUND CIRCUIT BETWEEN IN-VEHICLE SENSOR AND FRONT AIR
CONTROL
1. Press ignition switch OFF.
2. Disconnect front air control connector M37.
3. Check continuity between front air control harness connector
M37 (A) terminal 26 and in-vehicle sensor harness connector
M34 (B) terminal 2.
If OK, check harness for short.
Is the inspection result normal?
YES
>> GO TO 3
NO
>> Repair harness or connector.
3.
CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. Refer to
HAC-55, "Component Inspection"
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
2. Confirm system operation.
NO
>> 1. Replace in-vehicle sensor. Refer to
VTL-9, "Removal and Installation"
.
2. Confirm system operation.
4.
CHECK IN-VEHICLE SENSOR CIRCUIT BETWEEN AMBIENT SENSOR AND FRONT AIR CONTROL
1. Press ignition switch OFF.
2. Disconnect front air control connector M37.
3. Check continuity between front air control harness connector
M37 (A) terminal 27 and in-vehicle sensor harness connector
M34 (B) terminal 1.
If OK, check harness for short.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
.
2. Confirm system operation.
NO
>> Repair harness or connector.
Terminal
Voltage (V)
(Approx.)
(+)
(-)
Connector - Terminal
Body ground
5V
M34 - 1
WJIA0082E
Terminals
Continuity
Connector - Terminal
Connector - Terminal
Yes
M37 - 26
M34 - 2
AWIIA0628ZZ
Terminals
Continuity
Connector - Terminal
Connector - Terminal
Yes
M37 - 27
M34 - 1
AWIIA0629ZZ
IN-VEHICLE SENSOR
HAC-55
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Component Inspection
INFOID:0000000004498220
In-vehicle Sensor
After disconnecting in-vehicle sensor connector M34, measure resis-
tance between terminals 1 and 2 at sensor side, using the table
below.
If NG, replace in-vehicle sensor. Refer to
Temperature
°C (°F)
Resistance k
Ω
−15 (5)
12.73
−10 (14)
9.92
−5 (23)
7.80
0 (32)
6.19
5 (41)
4.95
10 (50)
3.99
15 (59)
3.24
20 (68)
2.65
25 (77)
2.19
30 (86)
1.81
35 (95)
1.51
40 (104)
1.27
45 (113)
1.07
RJIA4097E
HAC-56
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
SUNLOAD SENSOR
SUNLOAD SENSOR
Description
INFOID:0000000004498221
COMPONENT DESCRIPTION
The sunload sensor (1) is located on the LH tweeter 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.
SUNLOAD INPUT PROCESS
The front air control also includes a processing circuit which averages the variations in detected sunload over
a period of time. This prevents drastic swings in the automatic temperature control 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 sunload 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 automatic temperature control 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 accordingly.
Diagnosis Procedure
INFOID:0000000004498222
DIAGNOSTIC PROCEDURE
SYMPTOM: Sunload sensor circuit is open or shorted.
1.
CHECK VOLTAGE BETWEEN SUNLOAD SENSOR HARNESS CONNECTOR AND BODY GROUND
1. Disconnect sunload sensor connector.
2. Press ignition switch ON.
3. Check voltage between sunload sensor harness connector M56
terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2
NO
>> GO TO 4
AWIIA0033ZZ
AWIIA0034GB
Terminal
Voltage (V)
(Approx.)
(+)
(-)
Connector - Terminal
Body ground
5V
M56 - 1
RJIA0254E
SUNLOAD SENSOR
HAC-57
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
2.
CHECK SUNLOAD SENSOR GROUND CIRCUIT BETWEEN SUNLOAD SENSOR AND FRONT AIR
CONTROL
1. Press ignition switch OFF.
2. Disconnect front air control connector M37.
3. Check continuity between front air control connector M37 (A)
terminal 26 and sunload sensor harness connector M56 (B) ter-
minal 2.
If OK, check harness for short.
Is the inspection result normal?
YES
>> GO TO 3
NO
>> Repair harness or connector.
3.
CHECK SUNLOAD SENSOR
Check sunload sensor. Refer to
HAC-57, "Component Inspection"
.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
2. Confirm system operation.
NO
>> 1. Replace sunload sensor. Refer to
VTL-10, "Removal and Installation"
2. Confirm system operation.
4.
CHECK SUNLOAD SENSOR CIRCUIT BETWEEN SUNLOAD SENSOR AND FRONT AIR CONTROL
1. Press ignition switch OFF.
2. Disconnect front air control connector M37.
3. Check continuity between front air control connector M37 (A)
terminal 7 and sunload sensor harness connector M56 (B) ter-
minal 1.
If OK, check harness for short.
Is the inspection result normal?
YES
>> 1. Replace front air control. Refer to
VTL-8, "Removal and Installation"
2. Confirm system operation.
NO
>> Repair harness or connector.
Component Inspection
INFOID:0000000004498223
Sunload Sensor
Measure voltage between front air control harness connector M37 terminal 7 and ground.
If NG, replace front air control. Refer to
VTL-8, "Removal and Installation"
Terminals
Continuity
Connector - Terminal
Connector - Terminal
Yes
M37 - 26
M56-2
AWIIA0630ZZ
Terminals
Continuity
Connector - Terminal
Connector - Terminal
Yes
M37 - 7
M56 - 1
AWIIA0631ZZ
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