2007 INFINITI M35 sensor

TROUBLE DIAGNOSIS
ATC-61
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 M35/M45
13. CHECK MALFUNCTIONING SENSOR AND DOOR MOTOR
Refer to the following chart for malfunctioning code No.
(If two or more sensors and door motors malfunction, corresponding code Nos. indicates 1 second each.)
(If two door motors malfunction, corresponding code Nos. indicates 0.5 second each.)
*1: Perform self-diagnosis STEP-2 under sunshine.
When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise code No. 25 will indicate
despite that sunload sensor is functioning properly.
*2: AT C - 11 2 , "
DIAGNOSIS PROCEDURE FOR AMBIENT SENSOR" .
*3: AT C - 11 6 , "
DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR" .
*4: ATC-121, "
DIAGNOSIS PROCEDURE FOR INTAKE SENSOR" .
*5: AT C - 11 8 , "
DIAGNOSIS PROCEDURE FOR SUNLOAD SENSOR" .
*6: AT C - 8 4 , "
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR PBR" .
>> INSPECTION END
Code No. Malfunctioning sensor and door motor (Including circuits) Reference page
21 / −21 Ambient sensor *2
22 / −22 In-vehicle sensor *3
24 / −24 Intake sensor *4
25 / −25
Sunload sensor
*1*5
26 / −26 Air mix door motor PBR (Driver side)
*6
27 / −27 Air mix door motor PBR (Passenger side)
SJIA1781E

ATC-68
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
COMPONENT DESCRIPTION
Unified Meter and A/C Amp. (Automatic Amplifier)
The unified meter and A/C amp. has a built-in microcomputer which
processes information sent from various sensors needed for air con-
ditioner operation. The air mix door motor, mode door motor, upper
ventilator door motor, intake door motor, blower motor and compres-
sor are then controlled.
When the various switches and temperature control switch are oper-
ated, data is input to the unified meter and A/C amp. from the AV
control unit / NAVI control unit using CAN communication.
Self-diagnosis functions are also built into unified meter and A/C
amp. to provide quick check of malfunctions in the auto air condi-
tioner system.
Potentio Temperature Control (PTC)
The PTC is built into the multifunction switch. It can be set at an
interval of 0.5°C (1.0°F) in the 18°C (60°F) to 32°C (90°F) tempera-
ture range by pressing temperature control switch. The set tempera-
ture is displayed.
DIAGNOSIS PROCEDURE FOR A/C SYSTEM
SYMPTOM: A/C system does not come on.
RJIA4032E
RJIA4048E
RJIA4049E

TROUBLE DIAGNOSIS
ATC-77
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 M35/M45
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:

Unified meter and A/C amp.

Mode 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)

In-vehicle sensor

Ambient sensor

Sunload sensor

Intake 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.
*1ATC-37, "Discharge Air Flow"*2AT C - 6 5 , "Operational Check"*3ATC-121, "Intake Sensor Circuit"
*4ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*5AT C - 11 2 , "
Ambient Sensor Circuit"*6AT C - 11 5 , "In-vehicle Sensor Circuit"
*7ATC-118, "Sunload Sensor Circuit"*8AT C - 8 2 , "Air Mix Door Motor Cir-
cuit"
*9AT C - 5 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*10ATC-71, "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*11ATC-139, "MODE DOOR MOTOR"*12AT C - 4 1 , "SYMPTOM TABLE"
RJIA4056E

TROUBLE DIAGNOSIS
ATC-79
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 M35/M45
Upper Ventilator Door Motor CircuitNJS000GP
SYMPTOM

Upper ventilator outlet does not change.

Upper ventilator door motor does not operate normally.
INSPECTION FLOW
*1ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2.*2AT C - 5 7 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 5.*3AT C - 5 7 , "
FUNCTION CONFIRMA-
TION PROCEDURE", see No. 6.
*4ATC-118, "
Sunload Sensor Circuit"*5AT C - 5 7 , "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.*6AT C - 7 1 , "
DIAGNOSIS PROCE-
DURE FOR LAN CIRCUIT"
*7ATC-141, "UPPER VENTILATOR
DOOR MOTOR"
*8AT C - 6 5 , "Operational Check"*9AT C - 4 1 , "SYMPTOM TABLE"
SJIA1775E

ATC-80
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
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

ATC-82
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
Air Mix Door Motor CircuitNJS000GQ
SYMPTOM

Discharge air temperature does not change.

Air mix door motor does not operate normally.
INSPECTION FLOW
*1ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*2ATC-112, "
Ambient Sensor Circuit"*3ATC-115, "In-vehicle Sensor Circuit"
*4ATC-118, "Sunload Sensor Circuit"*5ATC-82, "Air Mix Door Motor Circuit"*6ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7ATC-71, "
LAN System Circuit"*8ATC-65, "Operational Check"*9ATC-41, "SYMPTOM TABLE"
*10ATC-121, "Intake Sensor Circuit"
SJIA1762E

TROUBLE DIAGNOSIS
ATC-83
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 M35/M45
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:

Unified meter and A/C amp.

Air mix 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)

In-vehicle sensor

Ambient sensor

Sunload sensor

Intake 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.
Air Mix Door Control Specification
RJIA4217E
RJIA1782E

TROUBLE DIAGNOSIS
ATC-85
C
D
E
F
G
H
I
K
L
MA
B
AT C
Revision: 2007 April2007 M35/M45
Intake Door Motor CircuitNJS000GS
SYMPTOM

Intake door does not change.

Intake door motor does not operate normally.
INSPECTION FLOW
*1ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*2AT C - 11 2 , "
Ambient Sensor Circuit"*3ATC-115, "In-vehicle Sensor Circuit"
*4ATC-118, "Sunload Sensor Circuit"*5AT C - 8 2 , "Air Mix Door Motor Cir-
cuit"
*6ATC-57, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 13.
*7ATC-71, "
LAN System Circuit"*8ATC-132, "INTAKE DOOR
MOTOR"
*9ATC-65, "Operational Check"
*10ATC-41, "SYMPTOM TABLE"*11ATC-121, "Intake Sensor Circuit"
RJIA4066E