NISSAN TEANA 2003 Service Manual
Page 441 of 3502
TROUBLE DIAGNOSIS
ATC-63
C
D
E
F
G
H
I
K
L
MA
B
AT C
Mode Door Motor CircuitBJS000G1
SYMPTOM
Air outlet does not change.
Mode door motor does not operate normally.
INSPECTION FLOW
*1ATC-31, "Discharge Air Flow"*2ATC-54, "Operational Check"*3ATC-105, "Intake Sensor Circuit"
*4ATC-47, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*5ATC-96, "
Ambient Sensor Circuit"*6ATC-99, "In-vehicle Sensor Circuit"
*7ATC-102, "Sunload Sensor Circuit"*8ATC-66, "Air Mix Door Motor Circuit"*9ATC-47, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10ATC-59, "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11ATC-123, "MODE DOOR MOTOR"*12ATC-35, "SYMPTOM TABLE"
SJIA1671E
Page 442 of 3502
ATC-64
TROUBLE DIAGNOSIS
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 is returned to the unified meter and A/C amp.
RJIA1777E
Page 443 of 3502
TROUBLE DIAGNOSIS
ATC-65
C
D
E
F
G
H
I
K
L
MA
B
AT C
Mode Door Control Specification
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 9 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA1778E
RJIA3255E
Page 444 of 3502
ATC-66
TROUBLE DIAGNOSIS
Air Mix Door Motor CircuitBJS000G2
SYMPTOM
Discharge air temperature does not change.
Air mix door motor does not operate normally.
INSPECTION FLOW
*1ATC-47, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*2ATC-96, "
Ambient Sensor Circuit"*3ATC-99, "In-vehicle Sensor Circuit"
*4ATC-102, "Sunload Sensor Circuit"*5ATC-66, "Air Mix Door Motor Circuit"*6ATC-47, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7ATC-59, "
LAN System Circuit"*8ATC-124, "AIR MIX DOOR MOTOR"*9ATC-54, "Operational Check"
*10ATC-35, "SYMPTOM TABLE"*11ATC-105, "Intake Sensor Circuit"
RJIA3256E
Page 445 of 3502
TROUBLE DIAGNOSIS
ATC-67
C
D
E
F
G
H
I
K
L
MA
B
AT C
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 motor opening angle data to the air mix door motor LCUs,
mode door motor LCU and intake door motor LCU.
The air mix door motors, 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
RJIA1781E
RJIA1782E
Page 446 of 3502
ATC-68
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motors are attached to the heater & cooling unit
assembly. It rotates so that the air mix door is opened or closed to a
position set by the unified meter and A/C amp. Air mix door rotates
gear of slide door directly and moves slide door.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR
SYMPTOM: Discharge air temperature does not change.
Perform diagnosis procedure. Refer to AT C - 5 9 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
Air Mix Door Motor PBR CircuitBJS000G3
SYMPTOM
Discharge air temperature does not change.
PBR circuit is open or shorted.
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR
Perform diagnosis procedure. Refer to AT C - 5 9 , "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA3257E
RJIA3258E
Page 447 of 3502
TROUBLE DIAGNOSIS
ATC-69
C
D
E
F
G
H
I
K
L
MA
B
AT C
Intake Door Motor CircuitBJS000G4
SYMPTOM
Intake door does not change.
Intake door motor does not operate normally.
INSPECTION FLOW
*1AT C - 4 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*2AT C - 9 6 , "
Ambient Sensor Circuit"*3AT C - 9 9 , "In-vehicle Sensor Circuit"
*4ATC-102, "Sunload Sensor Circuit"*5AT C - 6 6 , "Air Mix Door Motor Circuit"*6AT C - 4 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7AT C - 5 9 , "
LAN System Circuit"*8AT C - 11 7 , "INTAKE DOOR MOTOR"*9AT C - 5 4 , "Operational Check"
*10AT C - 3 5 , "SYMPTOM TABLE"*11ATC-105, "Intake Sensor Circuit"
SJIA1650E
Page 448 of 3502
ATC-70
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
Unified meter and A/C amp.
Intake 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 intake door control determines intake door position based on the ambient temperature, the intake air tem-
perature and the in-vehicle temperature. When the DEF or OFF switches are pressed or A/C switch is OFF,
the unified meter and A/C amp. sets the intake door at the FRE position.
Intake Door Control Specification
SJIA1651E
RJIA4067E
Page 449 of 3502
TROUBLE DIAGNOSIS
ATC-71
C
D
E
F
G
H
I
K
L
MA
B
AT C
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor is attached to the blower unit. It rotates so that
air is drawn from inlets set by the unified meter and A/C amp. Motor
rotation is conveyed to a lever which activates the intake door.
DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnosis procedure. Refer to AT C - 5 9 , "
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT" .
RJIA3260E
Page 450 of 3502
ATC-72
TROUBLE DIAGNOSIS
Blower Motor CircuitBJS000G5
SYMPTOM: Blower motor operation is malfunctioning.
INSPECTION FLOW
*1AT C - 5 4 , "Operational Check"*2ATC-105, "Intake Sensor Circuit"*3AT C - 4 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2.
*4AT C - 4 7 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 6.*5ATC-47, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.*6AT C - 7 4 , "
DIAGNOSIS PROCE-
DURE FOR BLOWER MOTOR"
*7AT C - 3 5 , "SYMPTOM TABLE"*8ATC-96, "Ambient Sensor Circuit"*9AT C - 9 9 , "In-vehicle Sensor Circuit"
*10ATC-102, "Sunload Sensor Circuit"*11EC-131, "DTC P0117, P0118 ECT
SENSOR" (QR engine) or EC-474,
"DTC P0117, P0118 ECT SEN-
SOR" (VQ engine)
RJIA3261E