2007 NISSAN 350Z Automatic Air Conditioner Workshop Manual

TROUBLE DIAGNOSIS
ATC-97
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2006 November2007 350Z
Sunload Sensor CircuitNJS0001C
COMPONENT DESCRIPTION
The sunload sensor is located on the passenger’s side 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 unified meter and A/C amp.
SUNLOAD INPUT PROCESS
The unified meter and A/C amp. also includes a processing circuit which averages the variations in detected
sunload over a period of time. This prevents drastic swings 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 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 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.
DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR
SYMPTOM: Sunload sensor circuit is open or shorted. (LED of A/C
switch does not illuminate as a result of performing self-diagnosis
STEP-2.)
1. CHECK VOLTAGE BETWEEN SUNLOAD SENSOR AND GROUND
1. Disconnect sunload sensor connector.
2. Turn ignition switch ON.
3. Check voltage between sunload sensor harness connector M18
terminal 1 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
RJIA1404E
RJIA1455E
1 – Ground : Approx. 5 V
RJIA2027E

ATC-98
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
2. CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between sunload sensor harness connector
M18 terminal 2 and unified meter and A/C amp. harness con-
nector M50 terminal 49.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK SUNLOAD SENSOR
1. Reconnect sunload sensor connector and unified meter and A/C amp. connector.
2. Refer to AT C - 9 9 , "
Sunload Sensor" .
OK or NG
OK >> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
NG >> 1. Replace sunload sensor.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
4. CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between sunload sensor harness connector
M18 terminal 1 and unified meter and A/C amp. harness con-
nector M50 terminal 50.
4. Check continuity between sunload sensor harness connector
M18 terminal 1 and ground.
OK or NG
OK >> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
NG >> Repair harness or connector.2 – 49 : Continuity should exist.
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1 – 50 : Continuity should exist.
1 – Ground : Continuity should not exist.
RJIA2029E

TROUBLE DIAGNOSIS
ATC-99
C
D
E
F
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H
I
K
L
MA
B
AT C
Revision: 2006 November2007 350Z
COMPONENT INSPECTION
Sunload Sensor
Measure voltage between unified meter and A/C amp. harness con-
nector M50 terminal 50 and ground.

When checking sunload sensor, select a place where sunshine directly on it.
If NG, replace sunload sensor.
RJIA2141E
SHA930E

ATC-100
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Intake Sensor CircuitNJS0001D
COMPONENT DESCRIPTION
Intake Sensor
The intake sensor is located on the heater & cooling unit assembly. It
converts temperature of air after it passes through the evaporator
into a resistance value which is then input to the unified meter and A/
C amp.
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR
SYMPTOM: Intake sensor circuit is open or shorted. (LED of A/C
switch does not illuminate as a result of performing self-diagnosis
STEP-2.)
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 M255
terminal 2 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between intake sensor harness connector
M255 terminal 1 and unified meter and A/C amp. harness con-
nector M50 terminal 49.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
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RJIA1458E
2 – Ground : Approx. 5 V
RJIA2031E
1 – 49 : Continuity should exist.
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TROUBLE DIAGNOSIS
ATC-101
C
D
E
F
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H
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K
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MA
B
AT C
Revision: 2006 November2007 350Z
3. CHECK INTAKE SENSOR
Refer to ATC-101, "
Intake Sensor" .
OK or NG
OK >> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
NG >> 1. Replace intake sensor.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
4. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect unified meter and A/C amp. connector.
3. Check continuity between intake sensor harness connector
M255 terminal 2 and unified meter and A/C amp. harness con-
nector M50 terminal 41.
4. Check continuity between intake sensor harness connector
M255 terminal 2 and ground.
OK or NG
OK >> 1. Replace unified meter and A/C amp.
2. Go to self-diagnosis AT C - 4 6 , "
FUNCTION CONFIRMATION PROCEDURE" and perform self-
diagnosis STEP-2.
NG >> Repair harness or connector.
COMPONENT INSPECTION
Intake Sensor
After disconnecting intake sensor connector M255, measure resis-
tance between terminals 1 and 2 at sensor side. Refer to the table
below.
If NG, replace intake sensor.2 – 41 : Continuity should exist.
2 – Ground : Continuity should not exist.
RJIA2033E
Temperature °C (°F) Resistance kΩ
−15 (5) 12.34
−10 (14) 9.62
−5 (23) 7.56
0 (32) 6.00
5 (41) 4.80
10 (50) 3.87
15 (59) 3.15
20 (68) 2.57
25 (77) 2.12
30 (86) 1.76
35 (95) 1.47
40 (104) 1.23
45 (113) 1.04
RJIA1462E

ATC-102
A/C CONTROLLER
Revision: 2006 November2007 350Z
A/C CONTROLLERPFP:27500
Removal and InstallationNJS0001E
REMOVAL
1. Remove console finisher (A/T) or console boot (M/T). Refer to IP-10, "INSTRUMENT PANEL ASSEM-
BLY" .
2. Remove mounting screws (A) and clips (B), and then remove A/
C controller (1) from console finisher (A/T) or console boot (M/
T).
INSTALLATION
Installation is basically the reverse order of removal.
Disassembly and AssemblyNJS000CT
NOTE:
When disassembling controller, wind gummed tape around each dial assembly and pull out the dial assembly
together with switch from the A/C controller assembly.
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1. A/C controller assembly 2. Mode control dial 3. Rear window defogger switch
4. Intake switch 5. A/C switch 6. Fan control dial
7. Temperature control dial
SJIA1903E

AUTO AMP
ATC-103
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2006 November2007 350Z
AUTO AMPPFP:27760
Removal and Installation of Unified Meter and A/C Amp.NJS0001F
REMOVAL
1. Remove console finisher (A/T) or console boot (M/T). Refer to IP-10, "INSTRUMENT PANEL ASSEM-
BLY" .
2. Remove mounting screws, and then remove unified meter and
A/C amp.
INSTALLATION
Installation is basically the reverse order of removal.
RJIA1409E

ATC-104
AMBIENT SENSOR
Revision: 2006 November2007 350Z
AMBIENT SENSORPFP:27722
Removal and InstallationNJS0001G
REMOVAL
1. Disconnect ambient sensor connector.
2. Remove ambient sensor.
INSTALLATION
Installation is basically the reverse order of removal.
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