2004 INFINITI QX56 Air

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Page 475 of 3371

INFINITI QX56 2004  Factory Service Manual ATC-70
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
2. CHECK POWER SUPPLY CIRCUITS FOR AIR MIX DOOR MOTOR (DRIVER)
1. Turn ignition switch OFF.
2. Disconnect front air control connector M49 and ai

Page 476 of 3371

INFINITI QX56 2004  Factory Service Manual TROUBLE DIAGNOSIS
ATC-71
C
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MA
B
AT C
Revision: August 20072004 QX56
6. CHECK PBR FEEDBACK SIGNAL
1. Reconnect front air control connector and air mix door motor
(Driver) connector.
2.

Page 477 of 3371

INFINITI QX56 2004  Factory Service Manual ATC-72
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
3. CHECK PBR REFERENCE SIGNAL VOLTAGE
1. Turn ignition switch OFF.
2. Disconnect air mix door motor (Passenger) connector M143.
3. Turn ignition

Page 478 of 3371

INFINITI QX56 2004  Factory Service Manual TROUBLE DIAGNOSIS
ATC-73
C
D
E
F
G
H
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MA
B
AT C
Revision: August 20072004 QX56
7. CHECK PBR FEEDBACK CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect air mix door motor (Passenger) connector M1

Page 479 of 3371

INFINITI QX56 2004  Factory Service Manual ATC-74
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
4. CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR MOTOR (REAR) AND 
FRONT AIR CONTROL
1. Turn ignition switch OFF.
2. Disconnect front

Page 480 of 3371

INFINITI QX56 2004  Factory Service Manual TROUBLE DIAGNOSIS
ATC-75
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
7. CHECK PBR FEEDBACK CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect air mix door motor (Rear) connector B155 an

Page 482 of 3371

INFINITI QX56 2004  Factory Service Manual TROUBLE DIAGNOSIS
ATC-77
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: August 20072004 QX56
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are:
Front air control
Intake door motor

Page 483 of 3371

INFINITI QX56 2004  Factory Service Manual ATC-78
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
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