2007 NISSAN 350Z Automatic Air Conditioner Workshop Manual

TROUBLE DIAGNOSIS
ATC-57
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AT C
Revision: 2006 November2007 350Z
2. CHECK SIGNAL FOR UNIFIED METER AND A/C AMP.
Confirm A/C LAN signal between unified meter and A/C amp. har-
ness connector M50 terminal 43 and ground using an oscilloscope.
OK or NG
OK >> GO TO 3.
NG >> Replace unified meter and A/C amp.
3. CHECK POWER SUPPLY FOR EACH DOOR MOTOR
Check voltage between each door motor harness connector terminal
1 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4. CHECK SIGNAL FOR EACH DOOR MOTOR
Confirm A/C LAN signal between each door motor harness connec-
tor terminal 3 and ground using an oscilloscope.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
Te r m i n a l s
Vo l ta g e (+)
(−) Unified meter
and A/C amp.
connectorTerminal No.
M50 43 Ground
RJIA1987E
SJIA1453J
1 – Ground : Battery voltage
RJIA1988E
Door
motorTerminals
Vo l ta g e (+)
(−)
ConnectorTerminal
No.
Mode M252 3
Ground Air mix M253 3
Intake M256 3
RJIA1989E
SJIA1453J

ATC-58
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
5. CHECK MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Check continuity between each door motor harness connector
terminal 2 and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6. CHECK MOTOR OPERATION
1. Reconnect each door motor connector.
2. Turn ignition switch ON.
3. Confirm operation of each door motor.
OK or NG
OK >> Return to operate normally.

Poor contact in motor connector
NG >> Does not operate normally.

GO TO 7.
7. CHECK AIR MIX DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect mode door motor, air mix door motor and intake door motor connector.
3. Reconnect air mix door motor and intake door motor connector.
4. Turn ignition switch ON.
5. Confirm operation of air mix door motor and intake door motor.
OK or NG
OK >> Air mix door motor and intake door motor operate normally.

Replace mode door motor.
NG >> Air mix door motor and intake door motor does not operate normally.

GO TO 8.
8. CHECK MODE DOOR MOTOR AND INTAKE DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect air mix door motor connector.
3. Reconnect mode door motor connector.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor and intake door motor.
OK or NG
OK >> Mode door motor and intake door motor operate normally.

Replace air mix door motor.
NG >> Mode door motor and intake door motor does not operate normally.

GO TO 9. 2 – Ground : Continuity should exist.
RJIA1990E

TROUBLE DIAGNOSIS
ATC-59
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Revision: 2006 November2007 350Z
9. CHECK MODE DOOR MOTOR AND AIR MIX DOOR MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect intake door motor connector.
3. Reconnect air mix door motor connector.
4. Turn ignition switch ON.
5. Confirm operation of mode door motor and air mix door motor.
OK or NG
OK >> Mode door motor and air mix door motor operate normally.

Replace intake door motor.
NG >> Mode door motor and air mix door motor does not operate normally.

Replace unified meter and A/C amp.

ATC-60
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Mode Door Motor CircuitNJS00010
SYMPTOM

Air outlet does not change.

Mode door motor does not operate normally.
INSPECTION FLOW
*1AT C - 3 0 , "Discharge Air Flow"*2ATC-53, "Operational Check"*3ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.
*4AT C - 4 6 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to 7.*5ATC-92, "
Ambient Sensor Circuit"*6ATC-94, "In-vehicle Sensor Circuit"
*7AT C - 9 7 , "Sunload Sensor Circuit"*8ATC-65, "Air Mix Door Motor PBR
Circuit"
*9ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.
SJIA1850E

TROUBLE DIAGNOSIS
ATC-61
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Revision: 2006 November2007 350Z
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:

Unified meter and A/C amp.

Mode door motor (LCU)

A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)

In-vehicle sensor

Ambient sensor

Sunload sensor

Intake sensor
System Operation
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door
motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors are compared by the LCUs in each door motor with the existing decision and open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
Mode Door Control Specification
*10ATC-56, "DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11AT C - 11 6 , "MODE DOOR MOTOR"*12AT C - 3 4 , "SYMPTOM TABLE"
*13ATC-100, "Intake Sensor Circuit"
RJIA1380E
RJIA1778E

ATC-62
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit assem-
bly. It rotates so that air is discharged from the outlet set by the uni-
fied meter and A/C amp. Motor rotation is conveyed to a link which
activates the mode door.
DIAGNOSIS PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnosis procedure. Refer to AT C - 5 6 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA0890E

TROUBLE DIAGNOSIS
ATC-63
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Revision: 2006 November2007 350Z
Air Mix Door Motor CircuitNJS00011
SYMPTOM

Discharge air temperature does not change.

Air mix door motor does not operate normally.
INSPECTION FLOW
*1ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*2ATC-92, "
Ambient Sensor Circuit"*3ATC-94, "In-vehicle Sensor Circuit"
*4ATC-97, "Sunload Sensor Circuit"*5ATC-65, "Air Mix Door Motor PBR
Circuit"
*6ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.
*7ATC-56, "
LAN System Circuit"*8ATC-65, "Air Mix Door Motor"*9ATC-53, "Operational Check"
*10ATC-34, "SYMPTOM TABLE"*11ATC-100, "Intake Sensor Circuit"*12ATC-46, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to
7.
SJIA1126E

ATC-64
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:

Unified meter and A/C amp.

Air mix door motor (LCU)

A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)

In-vehicle sensor

Ambient sensor

Sunload sensor

Intake sensor
System Operation
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door
motor LCU and intake door motor LCU.
The air mix door motor, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals received from the unified meter and A/C amp. and each of
the motor position sensors are compared by the LCUs in each door motor with the existing decision and open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
Air Mix Door Control Specification
RJIA1382E
RJIA1782E