Infiniti M35/M45 Y50. Manual — part 132

TROUBLE DIAGNOSIS

ATC-79

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Upper Ventilator Door Motor Circuit

NJS000GP

SYMPTOM

●

Upper ventilator outlet does not change.

●

Upper ventilator door motor does not operate normally.

INSPECTION FLOW

*1

ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"

, see No. 2.

*2

ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"

, see No. 5.

*3

ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"

, see No. 6.

*4

ATC-118, "Sunload Sensor Circuit"

*5

ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"

, see No. 13.

*6

ATC-71, "DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"

*7

ATC-141, "UPPER VENTILATOR
DOOR MOTOR"

*8

ATC-65, "Operational Check"

*9

ATC-41, "SYMPTOM TABLE"

SJIA1775E

ATC-80

TROUBLE DIAGNOSIS

SYSTEM DESCRIPTION
Component Parts

Upper ventilator door control system components are:

●

Unified meter and A/C amp.

●

Upper ventilator door motor (LCU)

●

A/C LAN system (PBR built-in mode door motor, upper ventilator door motor, air mix door motor and
intake door motor)

●

Sunload sensor

System Operation

The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix door, mode door, upper ventilator door and intake door opening angle data to the air mix door
motor LCUs, mode door motor LCUs, upper ventilator door motor LCU and intake door motor LCU.
The air mix door motors, mode door motors, upper ventilator door motor and intake door motor read their
respective signals according to the address signal. Opening angle indication signals received from the unified
meter and A/C amp. and each of the motor position sensors are compared by the LCUs in each door motor
with the existing decision and opening angles. Subsequently, HOT/COLD, DEF/VENT, OPEN/SHUT and FRE/
REC operation is selected. The new selection data are returned to the unified meter and A/C amp.

RJIA4060E

TROUBLE DIAGNOSIS

ATC-81

C

D

E

F

G

H

I

K

L

M

A

B

ATC

Upper Ventilator Door Control Specification

COMPONENT DESCRIPTION
Upper Ventilator Door Motor

The upper ventilator door motor is attached to the heater & cooling
unit assembly. It rotates so that air is discharged from the outlet set
by the unified meter and A/C amp. Motor rotation is conveyed to a
rod which activates the upper ventilator door.

DIAGNOSIS PROCEDURE FOR UPPER VENTILATOR DOOR MOTOR

SYMPTOM: Upper ventilator door motor does not operate normally.
Perform diagnosis procedure. Refer to

ATC-71, "DIAGNOSIS PROCEDURE FOR LAN CIRCUIT"

.

RJIA4061E

RJIA4062E

ATC-82

TROUBLE DIAGNOSIS

Air Mix Door Motor Circuit

NJS000GQ

SYMPTOM

●

Discharge air temperature does not change.

●

Air mix door motor does not operate normally.

INSPECTION FLOW

*1

ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"

, see No. 2 to 6.

*2

ATC-112, "Ambient Sensor Circuit"

*3

ATC-115, "In-vehicle Sensor Circuit"

*4

ATC-118, "Sunload Sensor Circuit"

*5

ATC-82, "Air Mix Door Motor Circuit"

*6

ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE"

, see No. 13.

*7

ATC-71, "LAN System Circuit"

*8

ATC-65, "Operational Check"

*9

ATC-41, "SYMPTOM TABLE"

*10

ATC-121, "Intake Sensor Circuit"

SJIA1762E