Infiniti QX56 (JA60). Manual — part 592
MODE DOOR MOTOR
HAC-25
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
COMPONENT DIAGNOSIS
MODE DOOR MOTOR
System Description
INFOID:0000000005147687
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• A/C auto amp.
• A/C and AV switch assembly
• Mode door motor (front)
• PBR (built into mode door motor)
• In-vehicle sensor
• Ambient sensor
• Optical sensor
• Intake sensor
System Operation
The mode door position (vent, B/L, foot, D/F, and defrost) is set by the A/C auto amp. by means of the mode
door motor (front). When a mode door position is selected on the A/C auto amp., voltage is applied to one cir-
cuit of the mode door motor (front) while ground is applied to the other circuit, causing the mode door motor
(front) 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 A/C auto amp. monitors the mode door position by measuring the voltage signal
on the PBR circuit.
In AUTO mode the mode door position is set by the A/C auto amp. which determines the proper position
based on inputs from the in-vehicle sensor, ambient sensor, optical sensor, intake sensor, and the temperature
selected by the driver or passenger.
Mode Door Control Specification
COMPONENT DESCRIPTION
Mode Door Motor (Front)
AWIIA0092GB
AWIIA0093GB
HAC-26
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
The mode door motor (front) is attached to the heater & cooling unit
assembly. It rotates so that air is discharged from the outlet as indi-
cated by the A/C auto amp. Motor rotation is conveyed to a link
which activates the mode door.
Mode Door Motor (Front) Component Function Check
INFOID:0000000005147688
INSPECTION FLOW
1.
CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - DISCHARGE AIR
1. Press mode switch four times and then press the
(DEF) switch. Each position indicator should change
shape (on display).
2. Confirm that discharge air comes out according to the air distribution table. Refer to
NOTE:
Confirm that the compressor clutch is engaged (visual inspection) and intake door position is at FRESH
when DEF (
) or D/F (
) is selected.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Go to diagnosis procedure. Refer to
HAC-26, "Mode Door Motor (Front) Diagnosis Procedure"
Mode Door Motor (Front) Diagnosis Procedure
INFOID:0000000005147689
Regarding Wiring Diagram information, refer to
SYMPTOM:
• Air outlet does not change.
• Mode door motor does not operate normally.
1.
CHECK A/C AUTO AMP. FOR POWER AND GROUND
1. Turn ignition switch ON.
2. Press the mode switch to the B/L (
) mode.
3. Check voltage between A/C auto amp. harness connector M49
terminal 19 and terminal 20 while pressing the mode switch to
the floor (
) mode.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK MODE DOOR MOTOR CIRCUITS FOR SHORT TO GROUND
WJIA0587E
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
20
19
Press
mode
switch
Battery
voltage
AWIIA0095ZZ
MODE DOOR MOTOR
HAC-27
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M49 terminal 19, 20 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
3.
CHECK A/C AUTO AMP. FOR GROUND AND POWER
1. Press the mode switch to the D/F (
) mode.
2. Check voltage between A/C auto amp. harness connector M49
terminal 19 and terminal 20 while pressing the mode switch to
the vent (
) mode.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace A/C auto amp. Refer to
VTL-7, "Removal and Installation"
.
4.
CHECK MODE DOOR MOTOR AND CIRCUITS FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M49 terminal 19 and terminal 20.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
CHECK MODE DOOR MOTOR CIRCUITS FOR OPEN
1. Disconnect the mode door motor harness connector.
2. Check continuity between A/C auto amp. harness connector
M49 (A) terminal 19, 20 and the mode door motor harness con-
nector M142 (B) terminal 5, 6.
Is the inspection result normal?
YES
>> Replace mode door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
6.
CHECK A/C AUTO AMP. FOR PBR POWER AND GROUND
19 - Ground
: Continuity should not exist.
20 - Ground
: Continuity should not exist.
AWIIA0096ZZ
Connector
Terminals
Condition
Voltage
(Approx.)
(+) (-)
A/C auto amp.:
M49
19 20
Press
mode
switch
Battery
voltage
AWIIA0097ZZ
Continuity should exist.
AWIIA0098ZZ
5 - 19
: Continuity should exist.
6 - 20
: Continuity should exist.
AWIIA0094ZZ
HAC-28
< COMPONENT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR MOTOR
1. Reconnect A/C auto amp. harness connector.
2. Turn ignition switch ON.
3. Check voltage between A/C auto amp. harness connector M50
(A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 terminal 28 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
NO
>> Repair or replace harness as necessary.
8.
CHECK PBR REFERENCE VOLTAGE AND GROUND CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect the A/C auto amp. harness connector.
3. Check continuity between A/C auto amp. harness connector
M50 (A) terminal 28 and M49 (B) terminal 3.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR OPEN
1. Disconnect the mode door motor harness connector.
2. Check continuity between mode door motor harness connector
M142 (B) terminal 3, 1 and A/C auto amp. harness connector
M49 (C) terminal 3, M50 (A) terminal 28.
Is the inspection result normal?
YES
>> Replace mode door motor. Refer to
.
NO
>> Repair or replace harness as necessary.
10.
CHECK PBR FEEDBACK VOLTAGE
Connector
Terminals
Voltage (Ap-
prox.)
(+)
(-)
A/C auto amp.: M49, M50
28
3
5V
AWIIA0099ZZ
Continuity should not exist.
AWIIA0100ZZ
Continuity should exist.
AWIIA0101ZZ
28 - 1
: Continuity should exist.
3 - 3
: Continuity should exist.
AWIIA0102ZZ
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