2008 INFINITI FX35 sensor

ATC-48
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
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.
>> INSPECTION END
14.CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH
Mode and/or intake door motor PBR(s) is/are malfunctioning.
(If two or more mode or intake door motors malfunc tion, corresponding code Nos. indicates 1 second each.)
*1: If mode door motor harness c onnector is disconnected, the following display pattern will appear.
31 →32 →33 →34 →35 →36 →Return to 31
*2: If intake door motor harness connector is disconnected, the following display pattern will appear.
37 →38 →39 →Return to 37
*3: FOOT position during automatic control. Refer to "AUXILIARY MECHANISM: FOOT POSITION SETTING
TRIMMER".
>> INSPECTION END
AUXILIARY MECHANISM: TEMPERATURE SETTING TRIMMER
The trimmer compensates for differences in range of ±3 °C ( ±6 °F) between temperature setting (displayed dig-
itally) and temperature felt by customer.
Operating procedures for this trimmer are as follows:1. Begin self-diagnosis STEP-5 mode. Refer to "Self-diagnosis Function".
2. Press (fan) UP switch to set system in auxiliary mode.
3. Display shows “61” in auxiliary mechanism. It ta kes approximately 3 seconds to enable setting operation.
SJIA1781E
Code No. *1 *2Mode or intake door position Reference page
31 VENT
Mode door motorAT C - 5 7 , "
Mode Door Motor Circuit"
32 B/L 1
33 B/L 2
34
FOOT
*3
35 D/F
36 DEF
37 FRE
Intake door motorATC-62, "
Intake Door Motor Circuit"38 20% FRE
39 REC
SJIA1782E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-52
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in GI-25,
"How to Perform Efficient Diagnosis for an Electrical Incident" and perform tests as outlined to simulate driving
conditions environment. If symptom appears, refer to ATC-32, "
How to Perform Trouble Diagnosis for Quick
and Accurate Repair" and perform applicable trouble diagnosis procedures.
Power Supply and Ground Circuit for Auto AmpINFOID:0000000001328183
SYMPTOM: A/C system does not activate.
INSPECTION FLOW
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, intake
door motor, blower motor and compressor 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 display
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)
*1 "DIAGNOSIS PROCEDURE FOR A/
C SYSTEM" *2
AT C - 5 0 , "Operational Check"*3AV- 7 9 , "Unable to Operate System
with A/C and AV Switch" (Without
navigation system) or AV- 1 2 7 , "
Un-
able to Operate System with A/C and
AV S w i t c h" (With navigation system)
SJIA1582E
SJIA1566E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-58
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
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, 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 and intake door opening angle data to the air mix door motor LCUs, mode door
motor LCU and intake door motor LCU.
The air mix door motors, mode 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 open-
ing angles. Subsequently, HOT/COLD, DEF/VENT and FRE/ REC operation is selected. The new selection
data are returned to the unified meter and A/C amp.
Mode Door Control Specification
*1 ATC-29, "Discharge Air Flow"*2AT C - 5 0 , "Operational Check"*3ATC-43, "Self-Diagnosis Function",
see No. 4 to 6.
*4 ATC-86, "
Ambient Sensor Circuit"*5AT C - 8 8 , "In-vehicle Sensor Circuit"*6ATC-91, "Sunload Sensor Circuit"
*7 ATC-94, "Intake Sensor Circuit"*8AT C - 5 9 , "Air Mix Door Motor Circuit"*9ATC-43, "Self-Diagnosis Function",
see No. 13.
*10 ATC-54, "
LAN System Circuit"*11AT C - 11 3*12ATC-32, "How to Perform Trouble Di-
agnosis for Quick and Accurate Re-
pair"
SJIA1585E
RJIA1778E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-60
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
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, air mix door motor and intake door motor)
 In-vehicle sensor
 Ambient sensor
*1AT C - 4 3 , "Self-Diagnosis Function",
see No. 4 to 6. *2
AT C - 8 6 , "Ambient Sensor Circuit"*3 AT C - 8 8 , "In-vehicle Sensor Circuit"
*4AT C - 9 1 , "Sunload Sensor Circuit"*5AT C - 6 2 , "Air Mix Door Motor PBR
Circuit"
*6 AT C - 4 3 , "Self-Diagnosis Function",
see No. 13.
*7 AT C - 5 4 , "
LAN System Circuit".*8 AT C - 5 0 , "Operational Check"*9AT C - 3 2 , "How to Perform Trouble
Diagnosis for Quick and Accurate
Repair"
*10AT C - 9 4 , "Intake Sensor Circuit"
SJIA1586E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

TROUBLE DIAGNOSISATC-61
< SERVICE INFORMATION >
C
DE
F
G H
I
K L
M A
B
AT C
N
O P
 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 and intake door motor opening angle data to the air mix door motor LCUs,
mode door motor LCU and intake door motor LCU.
The air mix door motors, mode door motor and intake door motor read their respective signals according to the
address signal. Opening angle indication signals receiv ed 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 open-
ing angles. Subsequently, HOT/COLD, DEF/VENT 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
COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motors are attached to the heater & cooling unit
assembly. It rotates so that the air mix door is opened or closed to a
position set by the unified meter and A/C amp. Motor rotation is then
conveyed through a shaft and the air mix door position feedback is
then sent to the unified meter and A/C amp. by PBR built-in air mix
door motor.
RJIA1781E
RJIA1782E
RJIA0893E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

TROUBLE DIAGNOSISATC-63
< SERVICE INFORMATION >
C
DE
F
G H
I
K L
M A
B
AT C
N
O P
SYSTEM DESCRIPTION
Component Parts
Intake door control system components are: Unified meter and A/C amp.
 Intake door motor (LCU)
 A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
 In-vehicle sensor
 Ambient sensor
 Sunload sensor
*1 AT C - 5 0 , "Operational Check"*2AT C - 4 3 , "Self-Diagnosis Function",
see No. 4 to 6. *3
AT C - 8 6 , "Ambient Sensor Circuit"
*4 AT C - 8 8 , "In-vehicle Sensor Circuit"*5AT C - 9 1 , "Sunload Sensor Circuit"*6 AT C - 9 4 , "Intake Sensor Circuit"
*7 AT C - 5 9 , "Air Mix Door Motor Circuit"*8AT C - 3 2 , "How to Perform Trouble
Diagnosis for Quick and Accurate
Repair"
*9 AT C - 4 3 , "Self-Diagnosis Function",
see No. 13.
*10 AT C - 5 4 , "
LAN System Circuit"*11AT C - 1 0 6
SJIA1807E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-64
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
 Intake sensor
System Operation
The intake door control determines intake door position based on the ambient temperature, the intake air tem-
perature and the in-vehicle temperature. When the DEF, or OFF switches are pressed or A/C switch is OFF,
the unified meter and A/C amp. sets the intake door at the FRE position.
Intake Door Control Specification
COMPONENT DESCRIPTION
Intake Door Motor
The intake door motor is attached to the blower unit. It rotates so that
air is drawn from inlets set by the unified meter and A/C amp. Motor
rotation is conveyed to a lever which activates the intake door.
DIAGNOSIS PROCEDURE FOR INTAKE DOOR MOTOR
SYMPTOM: Intake door motor does not operate normally.
Perform diagnosis procedure. Refer to ATC-54, "
LAN System Circuit".
Blower Motor CircuitINFOID:0000000001328189
SYMPTOM: Blower motor operation is malfunctioning.
INSPECTION FLOW
SJIA1588E
RJIA1787E
RJIA0897E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

TROUBLE DIAGNOSISATC-65
< SERVICE INFORMATION >
C
DE
F
G H
I
K L
M A
B
AT C
N
O P
SYSTEM DESCRIPTION
Component Parts
Fan speed control system components are:
 Unified meter and A/C amp.
 A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
 In-vehicle sensor
 Ambient sensor
 Sunload sensor
*1 AT C - 5 0 , "Operational Check"*2AT C - 4 3 , "Self-Diagnosis Function",
see No. 4. *3
AT C - 4 3 , "Self-Diagnosis Function",
see No. 6.
*4 AT C - 8 6 , "
Ambient Sensor Circuit"*5AT C - 8 8 , "In-vehicle Sensor Circuit"*6 AT C - 9 1 , "Sunload Sensor Circuit"
*7AT C - 9 4 , "Intake Sensor Circuit"*8AT C - 3 2 , "How to Perform Trouble Di-
agnosis for Quick and Accurate Re-
pair"
*9 AT C - 4 3 , "Self-Diagnosis Function",
see No. 13.
*10 "DIAGNOSIS PROCEDURE FOR BLOWER MOTOR" *11
EC-193
(VQ35DE) or EC-779
(VK45DE)
SJIA1808E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C