Page 3337 of 3833

TROUBLE DIAGNOSIS
ATC-61
C
D
E
F
G
H
I
K
L
MA
B
AT C
7.CHECK MODE DOOR MOTOR OPERATION
1. Disconnect mode door motor and air mix door motor connector.
2. Reconnect mode door motor connector and confirm the mode door motor operation.
OK or NG
OK >> (Mode door motor operates normally.)
●GO TO 8
NG >> (Mode door motor does not operate normally.)
●Replace the mode door motor.
8.CHECK AIR MIX DOOR MOTOR OPERATION
1. Disconnect mode door motor connector.
2. Reconnect air mix door motor connector and confirm the air mix door motor operation.
OK or NG
OK >> (Air mix door motor operates normally.)
●GO TO 9
NG >> (Air mix door motor does not operate normally.)
●Replace the air mix door motor.
9.CHECK INTAKE DOOR MOTOR OPERATION
1. Disconnect air mix door motor connector.
2. Reconnect intake door motor connector and confirm the intake door motor operation.
OK or NG
OK >> (Intake door motor operates normally.)
●Replace auto amp.
NG >> (Intake door motor does not operate normally.)
●Replace intake door motor.
Page 3338 of 3833
ATC-62
TROUBLE DIAGNOSIS
Mode Door Motor Circuit
EJS002FP
SYMPTOM:
●Air outlet does not change.
●Mode door motor does not operate normally.
INSPECTION FLOW
*1ATC-31, "Discharge Air Flow".*2AT C - 5 4 , "Operational Check".*3ATC-47, "PROCEDURE", see No.
1.
*4ATC-47, "
PROCEDURE", see No. 5
to 7.*5ATC-100, "Ambient Sensor Circuit".*6ATC-102, "In-vehicle Sensor Cir-
cuit".
*7ATC-105, "
Sunload Sensor Circuit".*8AT C - 6 4 , "Air Mix Door Motor Circuit".*9ATC-47, "PROCEDURE", see No.
14.
*10ATC-59, "
LAN System Circuit".*11ATC-124, "MODE DOOR MOTOR".*12ATC-54, "Operational Check".
*13ATC-33, "
SYMPTOM TABLE".*14ATC-108, "Intake Sensor Circuit".
RJIA0512E
Page 3339 of 3833

TROUBLE DIAGNOSIS
ATC-63
C
D
E
F
G
H
I
K
L
MA
B
AT C
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
●Auto amp.
●Mode door motor (LCU)
●A/C LAN system (PBR built-in air mix door motor, mode door motor and intake door motor)
●In-vehicle sensor
●Ambient sensor
●Sunload sensor
●Intake sensor
System Operation
The auto amplifier receives data from each of the sensors. The amplifier 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 auto amplifier and each of the motor posi-
tion sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new
selection data is returned to the auto amplifier.
Mode Door Control Specification
RHA045HA
RHA384HA
Page 3340 of 3833
ATC-64
TROUBLE DIAGNOSIS
COMPONENT DESCRIPTION
Mode Door Motor
The mode door motor is attached to the heater & cooling unit. It
rotates so that air is discharged from the outlet set by the auto ampli-
fier. Motor rotation is conveyed to a link which activates the mode
door.
DIAGNOSTIC PROCEDURE
SYMPTOM: Mode door motor and/or air mix door motor does not operate normally.
Perform diagnostic procedure for ATC-59, "
LAN System Circuit" .
Air Mix Door Motor CircuitEJS002FQ
SYMPTOM:
●Discharge air temperature does not change.
●Air mix door motor does not operate.
RJIA0513E
RJIA0514E
Page 3341 of 3833
TROUBLE DIAGNOSIS
ATC-65
C
D
E
F
G
H
I
K
L
MA
B
AT C
INSPECTION FLOW
*1ATC-47, "PROCEDURE", see No.1 *2ATC-100, "Ambient Sensor Circuit".*3ATC-102, "In-vehicle Sensor Circuit".
*4ATC-105, "
Sunload Sensor Circuit".*5ATC-64, "Air Mix Door Motor Circuit".*6ATC-47, "PROCEDURE", see No.
14.
*7ATC-59, "
LAN System Circuit".*8ATC-54, "Operational Check".*9ATC-54, "Operational Check".
*10ATC-33, "
SYMPTOM TABLE".*11ATC-108, "Intake Sensor Circuit".*12ATC-47, "PROCEDURE", see No. 5
to 7.
RJIA0515E
Page 3342 of 3833

ATC-66
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
●Auto amp.
●Air mix door motor (LCU)
●A/C LAN system (PBR built-in air mix door motor, mode door motor and intake door motor)
●In-vehicle sensor
●Ambient sensor
●Sunload sensor
●Intake sensor
System Operation
The auto amplifier receives data from each of the sensors. The amplifier sends air mix door, mode door and
intake door motor 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 auto amplifier and each of the motor posi-
tion sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subse-
quently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new
selection data is returned to the auto amplifier.
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the heater & cooling unit. It
rotates so that the air mix door is opened or closed to a position set
by the auto amplifier. The air mix door position is then fed back to the
auto amplifier by PBR built-in air mix door motor.
RHA424GB
RJIA0516E
Page 3343 of 3833
TROUBLE DIAGNOSIS
ATC-67
C
D
E
F
G
H
I
K
L
MA
B
AT C
Air Mix Door Control Specification
DIAGNOSTIC PROCEDURE
SYMPTOM: Discharge air temperature does not change.
Perform diagnostic procedure for ATC-59, "
LAN System Circuit" .
RJIA0517E
RHA457H
Page 3344 of 3833
ATC-68
TROUBLE DIAGNOSIS
Intake Door Motor Circuit
EJS001H3
SYMPTOM:
●Intake door does not change.
●Intake door motor does not operate normally.
INSPECTION FLOW
*1AT C - 9 8 , "Self-diagnosis", see No.1 *2ATC-100, "Ambient Sensor Circuit".*3ATC-102, "In-vehicle Sensor Cir-
cuit".
*4AT C - 1 0 5 , "
Sunload Sensor Circuit".*5ATC-64, "Air Mix Door Motor Circuit".*6ATC-47, "PROCEDURE", see No.
14.
*7AT C - 5 9 , "
LAN System Circuit".*8ATC-119, "INTAKE DOOR MOTOR".*9ATC-54, "Operational Check".
*10AT C - 4 7 , "
PROCEDURE", see No. 5
to 7.*11ATC-54, "Operational Check".*12ATC-33, "SYMPTOM TABLE".
*13ATC-108, "
Intake Sensor Circuit".
RJIA0518E