Page 3465 of 4179
TROUBLE DIAGNOSIS
ATC-69
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AT C
2. CHECK GROUND CIRCUIT FOR AUTO AMP.
1. Turn ignition switch OFF.
2. Check continuity between auto amp. harness connector M52
terminal 3 (B) and ground.
OK or NG
OK >> Replace auto amp.
NG >> Repair or replace harness.
LAN System CircuitEJS004L0
SYMPTOM: Mode door motor, intake door motor and/or air mix door motor(s) does not operate normally.
DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT
1. CHECK POWER SUPPLY FOR AUTO AMP.
1. Turn ignition switch ON.
2. Check voltage between auto amp. harness connector M52 ter-
minal 5 (W) and ground.
OK or NG
OK >> GO TO 2.
NG >> Replace auto amp.3 – Ground : Continuity should exist.
RJIA2857E
RJIA0507E
5 – Ground : Battery voltage
RJIA2858E
Page 3466 of 4179

ATC-70
TROUBLE DIAGNOSIS
2. CHECK SIGNAL FOR AUTO AMP.
Confirm A/C LAN signal between auto amp. harness connector M52
terminal 15 (G) and ground using an oscilloscope.
OK or NG
OK >> GO TO 3.
NG >> Replace auto amp.
3. CHECK POWER SUPPLY FOR EACH DOOR MOTOR
Check voltage between mode door motor harness connector M37
terminal 1 (W), air mix door motor harness connector M38 terminal 1
(W) or intake door motor harness connector M47 terminal 1 (W) and
ground.
OK or NG
OK >> GO TO 4.
NG >> Replace harness or connector.
4. CHECK SIGNAL FOR EACH DOOR MOTOR
Confirm A/C LAN signal between mode door motor harness connec-
tor M37 terminal 3 (G), air mix door motor harness connector M38
terminal 3 (G) or intake door motor harness connector M47 terminal
3 (G) and ground using an oscilloscope.
OK or NG
OK >> GO TO 5.
NG >> Replace harness or connector.
Terminals
Voltag e (+)
(−)
Auto amp.
connectorTerminal No.
(wire color)
M52 15 (G) Ground
RJIA3128E
HAK0652D
1 – Ground : Battery voltage
RJIA1988E
Terminals
Voltage (+)
(−)
Door motor
connectorTerminal No.
(wire color)
Mode door
: M373 (G)
Ground Air mix door
: M383 (G)
Intake door
: M473 (G)
RJIA1989E
HAK0652D
Page 3467 of 4179

TROUBLE DIAGNOSIS
ATC-71
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5. CHECK MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Check continuity between mode door motor harness connector
M37 terminal 2 (B), air mix door motor harness connector M38
terminal 2 (B) or intake door motor harness connector M47 ter-
minal 2 (B) and ground.
OK or NG
OK >> GO TO 6.
NG >> Replace harness or connector.
6. CHECK MOTOR OPERATION
1. Turn ignition switch OFF.
2. Disconnect each door motor connector.
3. Reconnect each door motor connector.
4. Turn ignition switch ON.
5. Confirm each door motor operation.
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, air mix, and intake door motor connectors.
3. Reconnect air mix and intake door motor connectors.
4. Turn ignition switch ON.
5. Confirm air mix door motor and intake door motor operation.
OK or NG
OK >> (Air mix and intake door motors operate normally.)
Replace mode door motor.
NG >> (Air mix and intake door motors 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 mode door motor and intake door motor operation.
OK or NG
OK >> (Mode and intake door motors operate normally.)
Replace air mix door motor.
NG >> (Mode and intake door motors does not operate normally.)
GO TO 9. 2 – Ground : Continuity should exist.
RJIA1990E
Page 3468 of 4179
ATC-72
TROUBLE DIAGNOSIS
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 mode door motor and air mix door motor operation.
OK or NG
OK >> (Mode and air mix door motors operate normally.)
Replace intake door motor.
NG >> (Mode and air mix door motors does not operate normally.)
Replace auto amp.
Page 3469 of 4179
TROUBLE DIAGNOSIS
ATC-73
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AT C
Mode Door Motor CircuitEJS004GX
SYMPTOM:
Air outlet does not change.
Mode door motor does not operate normally.
INSPECTION FLOW
*1ATC-32, "Discharge Air Flow".*2ATC-65, "Operational Check".*3ATC-59, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.
*4ATC-59, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to
7.*5ATC-109, "
Ambient Sensor Circuit".*6AT C - 111 , "In-vehicle Sensor Cir-
cuit".
*7ATC-114, "
Sunload Sensor Circuit".*8ATC-117, "Intake Sensor Circuit".*9ATC-76, "Air Mix Door Motor Cir-
cuit".
RJIA3095E
Page 3470 of 4179

ATC-74
TROUBLE DIAGNOSIS
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 amp. receives data from each of the sensors. The auto 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 auto amp. and each of the motor position
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 selec-
tion data is returned to the auto amp.
Mode Door Control Specification
*10ATC-59, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.*11AT C - 6 9 , "
LAN System Circuit".*12ATC-134, "MODE DOOR MOTOR".
*13ATC-34, "
SYMPTOM TABLE".
RJIA2828E
RHA384HA
Page 3471 of 4179
TROUBLE DIAGNOSIS
ATC-75
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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 amp.
Motor rotation is conveyed to a link which activates the mode door.
DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR
SYMPTOM: Mode door motor does not operate normally.
Perform diagnostic procedure. Refer to AT C - 6 9 , "
DIAGNOSTIC PROCEDURE FOR LAN CIRCUIT" .
RJIA0513E
RJIA0514E
Page 3472 of 4179
ATC-76
TROUBLE DIAGNOSIS
Air Mix Door Motor CircuitEJS004GY
SYMPTOM:
Discharge air temperature does not change.
Air mix door motor does not operate.
INSPECTION FLOW
*1AT C - 6 5 , "Operational Check".*2AT C - 5 9 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 1.*3ATC-59, "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5 to 7.
*4ATC-109, "
Ambient Sensor Circuit".*5AT C - 111 , "In-vehicle Sensor Circuit".*6ATC-114, "Sunload Sensor Circuit".
*7AT C - 11 7 , "
Intake Sensor Circuit".*8AT C - 7 8 , "DIAGNOSTIC PROCE-
DURE FOR AIR MIX DOOR
MOTOR".*9ATC-34, "
SYMPTOM TABLE".
*10AT C - 5 9 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 9.*11AT C - 6 9 , "
LAN System Circuit".*12ATC-135, "AIR MIX DOOR
MOTOR".
RJIA3097E