Page 2449 of 3171
MTC-62
TROUBLE DIAGNOSIS
7.CHECK PBR FEEDBACK SIGNAL
1. Reconnect the front air control connector and mode door motor
connector.
2. Turn ignition switch ON.
3. Check voltage between front air control harness connector M98
terminal 21 and ground.
4. Press mode switch through all modes.
OK or NG
OK >> Replace front air control. Refer toMTC-98, "CONTROL
UNIT".
NG >> GO TO 8.
8.CHECK PBR FEEDBACK CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the mode door motor connector and front air control
harness connector.
3. Check continuity between mode door motor harness connector
M46 terminal 4 and front air control harness connector M98 ter-
minal 21.
OK or NG
OK >> Replace mode door motor. Refer toMTC-110, "MODE
DOOR MOTOR".
NG >> Repair or replace harness as necessary.21 - Ground : Approx. 0 - 5V
WJIA1088E
4 - 21 : Continuity should exist.
WJIA1089E
Page 2450 of 3171
TROUBLE DIAGNOSIS
MTC-63
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Air Mix Door Motor CircuitEJS005GF
SYMPTOM:
lDischarge air temperature does not change.
lAir mix door motor does not operate.
INSPECTION FLOW
*1MTC-53, "Operational Check".*2MTC-51, "A/C System Self-diagno-
sis Function".*3MTC-52, "
SELF-DIAGNOSIS CODE
CHART".
*4MTC-64, "
DIAGNOSTIC PROCE-
DURE FOR AIR MIX DOOR
MOTOR (FRONT)".
MJIB0236E
Page 2451 of 3171

MTC-64
TROUBLE DIAGNOSIS
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
lFront air control
lAir mix door motors (Front and rear)
lPBR (built-into air mix motors)
System Operation
The front air control receives data from the temperature selected by the driver and rear passenger. The front
air control then applies a voltage to one circuit of the appropriate air mix door motor, while ground is applied to
the other circuit, causing the appropriate air mix door motor to rotate. The direction of rotation is determined by
which circuit has voltage applied to it, and which one has ground applied to it. The front air control monitors the
air mix door positions by measuring the voltage signal on the PBR circuits of each door.
Air Mix Door Control Specification
COMPONENT DESCRIPTION
Air Mix Door Motors
The air mix door motor is attached to the heater & cooling unit. This
motor rotates so that the air mix door is opened or closed to a posi-
tion set by the front air control. Motor rotation is then conveyed
through a shaft and the air mix door position is then fed back to the
front air control by the PBR built into the air mix door motor.
NOTE:
This illustration is for LHD models.
The layout for RHD models is symmetrically opposite.
DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)
1.CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS OR PROCEED FROM SYMPTOM
TABLE
Is vehicle equipped with NAVI?.
YESorNO
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS
Self-diagnosis code 22 is present. Refer toMTC-51, "
A/C System Self-diagnosis Function".
YESorNO
YES >> GO TO 3.
NO >> GO TO 4.
WJIA0435E
MJIB0192E
Page 2452 of 3171
TROUBLE DIAGNOSIS
MTC-65
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MTC
3.CHECK POWER SUPPLY CIRCUITS FOR AIR MIX DOOR MOTOR (FRONT)
1. Turn ignition switch OFF.
2. Disconnect front air control connector and air mix door motor
(Front) connector.
3. Check continuity between front air control harness connector
M98 terminal 2 and 3 and air mix door motor (Front) connector
M99 terminal 6 and 5.
OK or NG
OK >> Replace air mix door motor (Front). Refer toM T C - 111 ,
"AIR MIX DOOR MOTOR".
NG >> Repair or replace harness as necessary.
4.CHECK PBR REFERENCE SIGNAL VOLTAGE
1. Turn ignition switch OFF.
2. Disconnect the air mix door motor (Front) connector.
3. Turn ignition switch ON.
4. Check voltage between air mix door motor (Front) harness con-
nector M99 terminal 1 and ground.
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.2 - 6 : Continuity should exist.
3 - 5 : Continuity should exist.
MJIB0094E
1 - Ground : Approx. 5V
MJIB0095E
Page 2453 of 3171
MTC-66
TROUBLE DIAGNOSIS
5.CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR MOTOR (FRONT) AND
FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect the front air control connector.
3. Check continuity between air mix door motor (Front) harness
connector M99 terminal 1 and front air control harness connec-
tor M98 terminal 23.
OK or NG
OK >> Replace front air control. Refer toMTC-98, "CONTROL
UNIT".
NG >> Repair or replace harness as necessary.
6.CHECK PBR GROUND REFERENCE CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the front air control connector.
3. Check continuity between air mix door motor (Front) harness
connector M99 terminal 3 and front air control harness connec-
tor M98 terminal 26.
OK or NG
OK >> GO TO 7.
NG >> Repair or replace harness as necessary.1 - 23 : Continuity should exist.
MJIB0096E
3 - 26 : Continuity should exist.
MJIB0237E
Page 2454 of 3171
TROUBLE DIAGNOSIS
MTC-67
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MTC
7.CHECK PBR FEEDBACK SIGNAL
1. Turn ignition switch OFF.
2. Reconnect the front air control connector and air mix door motor
(Front) connector.
3. Check voltage between front air control harness connector M98
terminal 22 and ground.
4. Rotate Front temperature dial through complete range.
OK or NG
OK >> Replace front air control. Refer toMTC-98, "CONTROL
UNIT".
NG >> GO TO 8.
8.CHECK PBR FEEDBACK CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the air mix door motor (Front) connector and front air
control connector.
3. Check continuity between air mix door motor (Front) harness
connector M99 terminal 2 and front air control harness connec-
tor M98 terminal 22.
OK or NG
OK >> Replace air mix door motor (Front). Refer toM T C - 111 ,
"AIR MIX DOOR MOTOR".
NG >> Repair or replace harness as necessary.22 - Ground : Approx. 0V - 5V
MJIB0098E
2 - 22 Continuity should exist.
MJIB0099E
Page 2455 of 3171
MTC-68
TROUBLE DIAGNOSIS
Intake Door Motor Circuit
EJS005GG
SYMPTOM:
lIntake door does not change.
lIntake door motor does not operate normally.
INSPECTION FLOW
*1MTC-53, "Operational Check".*2MTC-51, "A/C System Self-diagno-
sis Function".*3MTC-52, "
SELF-DIAGNOSIS CODE
CHART".
MJIB0238E
Page 2456 of 3171

TROUBLE DIAGNOSIS
MTC-69
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MTC
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
lFront air control
lIntake door motor
System Operation
The intake door control determines the intake door position based on the position of the recirculation switch.
When the recirculation switch is depressed the intake door motor rotate closing off the fresh air inlet and recir-
culating the cabin air. If the recirculation switch is depressed again, the intake door motor rotate in the oppo-
site direction, again allowing fresh air into the cabin.
Intake Door Control Specification
COMPONENT DESCRIPTION
Intake door motor
The intake door motor is attached to the intake unit. It rotates so that
air is drawn from inlets set by the front air control. Motor rotation is
conveyed to a lever which activates the intake door.
NOTE:
This illustration is for LHD models.
The layout for RHD models is symmetrically opposite.
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR
1.CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS OR PROCEED FROM SYMPTOM
TABLE
Is vehicle equipped with NAVI?.
YES or NO
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK RESULT FROM FRONT AIR CONTROL SELF-DIAGNOSIS
Self-diagnosis code 82 is present. Refer toMTC-51, "
A/C System Self-diagnosis Function".
YES or NO
YES >> GO TO 3.
NO >> Replace front air control. Refer toMTC-98, "
CONTROL UNIT".
WJIA0436E
MJIB0194E