service INFINITI FX35 2008 Service Manual

LUBRICANTATC-23
< SERVICE INFORMATION >
C
DE
F
G H
I
K L
M A
B
AT C
N
O P
*1: If the refrigerant leak is small, no addition of lubricant is needed.
LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT
1. Before connecting recovery/recycling recharging equipm ent to vehicle, check recovery/recycling recharg-
ing equipment gauges. No refrigerant pressure should be displayed. If NG, recover refrigerant from equip-
ment lines.
2. Connect recovery/recycling recharging equipment to vehicle. Confirm refrigerant purity in supply tank
using recovery/recycling recharging equipment and refrigerant identifier. If NG, refer to AT C - 4 , "
Precaution
for Working with HFC-134a (R-134a)".
3. Confirm refrigerant purity in vehicle A/C system us ing recovery/recycling recharging equipment and refrig-
erant identifier. If NG, refer to AT C - 4 , "
Precaution for Working with HFC-134a (R-134a)".
4. Discharge refrigerant into the refrigerant recove ry/recycling equipment. Measure lubricant discharged into
the recovery/recycling equipment.
5. Drain the lubricant from the old (removed) comp ressor into a graduated container and recover the amount
of lubricant drained.
6. Drain the lubricant from the new compressor into a separate, clean container.
7. Measure an amount of new lubricant installed equal to amount drained from old compressor. Add this
lubricant to new compressor through the suction port opening.
8. Measure an amount of new lubricant equal to the am ount recovered during discharging. Add this lubricant
to new compressor through the suction port opening.
9. If the liquid tank also needs to be replaced, add another 5 m (0.2 US fl oz., 0.2 Imp fl oz.) of lubricant at
this time.
Do not add this 5 m (0.2 US fl oz., 0.2 Imp fl oz.) of lubricant when replaces the compressor only.
In case of refrigerant leak 30 (1.0, 1.1) Large leak
— Small leak*1
Part replacedLubricant to be added to system
Remarks
Amount of lubricant
m (US fl oz., Imp fl oz.)
RJIA3578E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-24
< SERVICE INFORMATION >
AIR CONDITIONER CONTROL
AIR CONDITIONER CONTROL
Description of Air Conditioner LAN Control SystemINFOID:0000000001328167
The LAN (Local Area Network) syst em consists of unified meter and A/C amp., mode door motor, air mix door
motors and intake door motor.
A configuration of these component s is shown in the figure below.
System ConstructionINFOID:0000000001328168
A small network is constructed between the unifi ed meter and A/C amp., air mix door motors, mode door
motor and intake door motor. The unified meter and A/C amp. and motors are connected by data transmission
lines and motor power supply lines. The LAN network is built through the ground circuits of each door motor.
Addresses, motor opening angle signals, motor stop si gnals and error checking messages are all transmitted
through the data transmission lines connecting the unified meter and A/C amp. and each door motor.
The following functions are contained in LCUs built into the air mix door motors, the mode door motor and the
intake door motor.
 Address
 Motor opening angle signals
 Data transmission
 Motor stop and drive decision
 Opening angle sensor (PBR function)
 Comparison
 Decision (Unified meter and A/C amp. indicated value and motor opening angle comparison)
OPERATION
The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door
motor LCU and intake door motor LCU.
The mode door motor, air mix door motors 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 is 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 is returned to the unified meter and A/C amp.
SJIA1609E
RJIA1747E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

AIR CONDITIONER CONTROLATC-25
< SERVICE INFORMATION >
C
DE
F
G H
I
K L
M A
B
AT C
N
O P
TRANSMISSION DATA AND TRANSMISSION ORDER
Unified meter and A/C amp. data is transmitted consecut ively to each of the door motors following the form
shown in figure below.
Sta rt:
Initial compulsory signal is sent to each of the door motors.
Address:
Data sent from the unified meter and A/C amp. are selected according to data-based decisions made by the
air mix door motor, mode door motor and intake door motor.
If the addresses are identical, the opening angle data and error check signals are received by the door motor
LCUs. The LCUs then make the appropriate error decis ion. If the opening angle data have no error, door con-
trol begins.
If an error exists, the received data are rejected and corrected data received. Finally, door control is based
upon the corrected opening angle data.
Opening Angle:
Data that shows the indicated door opening angle of each door motor.
Error Check:
In this procedure, transmitted and received data is check ed for errors. Error data are then compiled. The error
check prevents corrupted data from being used by the ai r mix door motor, the mode door motor and the intake
door motor. Error data can be related to the following symptoms.
 Malfunction of electrical frequency
 Poor electrical connections
 Signal leakage from transmission lines
 Signal level fluctuation
Stop Signal:
At the end of each transmission, a stop operation, in-oper ation, or internal malfunction message is delivered to
the unified meter and A/C amp. This comple tes one data transmission and control cycle.
AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)
RJIA1748E
RJIA1749E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-26
< SERVICE INFORMATION >
AIR CONDITIONER CONTROL
The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temper ature, in-vehicle temperature and amount of sunload.
FAN SPEED CONTROL
Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
With pressing AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower moto r operation is delayed to prevent cool air from flow-
ing.
INTAKE DOOR CONTROL
The intake doors are automatically controlled by the tem perature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of s unload and ON/OFF operation of the compressor.
MODE DOOR CONTROL
The mode door is automatically controlled by the temperat ure setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
MAGNET CLUTCH CONTROL
When A/C switch, AUTO switch or DEF switch is pr essed, unified meter and A/C amp. transmits compressor
ON signal to BCM.
BCM sends compressor ON signal to ECM, via CAN communication.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-
sor signal, throttle angle, etc.). If it judges compre ssor can be turned ON, it sends compressor ON signal to
IPDM E/R, via CAN communication.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
When sending compressor ON signal to IPDM E/R via CAN communication, ECM simultaneously sends com-
pressor feedback signal to unified meter and A/C amp. via CAN communication.
Unified meter and A/C amp., then, uses input compressor feedback signal to control air inlet.
SELF-DIAGNOSIS SYSTEM
The self-diagnosis system is built into the unified mete r and A/C amp. to quickly locate the cause of malfunc-
tions.
RJIA1957E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

AIR CONDITIONER CONTROLATC-27
< SERVICE INFORMATION >
C
DE
F
G H
I
K L
M A
B
AT C
N
O P
Description of Control SystemINFOID:0000000001328169
The control system consists of input sensors, swit ches, the unified meter and A/C amp. (microcomputer) and
outputs. The relationship of these co mponents is shown in the figure below:
Control OperationINFOID:0000000001328170
DISPLAY SCREEN
The operation status of the system is displayed on the screen.
AUTO SWITCH
 The compressor, intake doors, air mix doors, mode doors and blower speed are automatically controlled so
that the in-vehicle temperature will reach, and be mainta ined at the set temperature selected by the operator.
SJIA1658E
SJIA1567E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-28
< SERVICE INFORMATION >
AIR CONDITIONER CONTROL
 When pressing AUTO switch, air inlet, air outlet, fan speed, and discharge air temperature are automatically
controlled.
TEMPERATURE CONTROL SWITCH (POTENTIO TEMPERATURE CONTROL) (DRIVER SIDE)
The set temperature is increased or decreased with this switch.
TEMPERATURE CONTROL SWITCH (POTENTIO TEMPERATURE CONTROL) (PASSENGER
SIDE)
 The set temperature is increased or decreased with this switch.
 When the temperature switch is pressed, the DUA L switch indicator will automatically illuminate.
INTAKE SWITCH
 When intake switch is ON, REC LED turns ON, and air inlet is fixed to REC.
 When press intake switch again, FRE LED turns ON, and air inlet is fixed to FRE.
 When intake switch is pressed for approximately 1. 5 seconds or longer, FRE and REC LEDs blink twice.
Then, automatic control mode is entered. Inlet status is displayed by LED even during automatic controlled.
 When FRE LED is turned ON, shifting mode position to D/ F or DEF, or when compressor is turned from ON
to OFF, intake switch is automatically turned OFF (fixed to FRE mode). REC mode can be re-entered by
pressing intake switch again, and then compressor is turned ON. (Except D/F or DEF position)
DEFROSTER (DEF) SWITCH
Mode doors are set to the defrost position with this switch . Also, intake doors are set to the outside air position,
and compressor turns ON.
REAR WINDOW DEFOGGER SWITCH
When illumination is ON, rear window is defogged.
OFF SWITCH
Compressor and blower are OFF, the intake door s and the mode doors are automatically controlled.
A/C SWITCH
Compressor is ON or OFF with this switch.
(Pressing the A/C switch when the A/C switch is ON will turn OFF the A/C switch and compressor.)
MODE SWITCH
The air discharge outlets is controlled with this switch.
FAN SWITCH
The blower speed is manually controlled with this swit ch. Seven speeds are available for manual control (as
shown on the display screen).
DUAL SWITCH
 When the DUAL switch indicator is illuminated, the driver side and passenger side temperature can each be set independently.
 When the DUAL switch indicator is not illuminated, t he driver side setting temperature is applied to both
sides.
Fail-Safe FunctionINFOID:0000000001328171
If a communication error exists between the unified meter and A/C amp., and the A/C and AV switch for 30
seconds or longer, air conditioner is controlled under following conditions:
Compressor : ON
Air outlet : AUTO
Air inlet : FRE (Fresh)
Blower fan speed : AUTO
Set temperature : Setting befo re communication error occurs
Display : OFF
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

AIR CONDITIONER CONTROLATC-29
< SERVICE INFORMATION >
C
DE
F
G H
I
K L
M A
B
AT C
N
O P
Discharge Air FlowINFOID:0000000001328172
SJIA1568E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-30
< SERVICE INFORMATION >
AIR CONDITIONER CONTROL
System Description
INFOID:0000000001328173
SWITCHES AND THEIR CONTROL FUNCTION
CAN Communication System DescriptionINFOID:0000000001328174
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication s peed and excellent error detection ability. Many elec-
SJIA1610E
SJIA1890E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

AIR CONDITIONER CONTROLATC-31
< SERVICE INFORMATION >
C
DE
F
G H
I
K L
M A
B
AT C
N
O P
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. For details, refer to LAN-43,
"CAN System Specification Chart".
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

ATC-32
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
CONSULT-III FunctionINFOID:0000000001328175
CONSULT-III can display each diagnosis item using the diagnosis test modes shown following.
DATA MONITOR
Display Item List
How to Perform Trouble Diagnosis for Quick and Accurate RepairINFOID:0000000001328176
WORK FLOW
SYMPTOM TABLE
System part Check item, diagnosis mode Description
BCM Data monitor Displays BCM input data in real time.
Monitor item name “operation or unit” Contents
IGN ON SW “On/Off” Displays “IGN position (On)/OFF, ACC position (Off)” status as judged from ignition switch signal.
FAN ON SIG “On/Off” Displays “FAN (On)/FAN (Off)” status as judged from blower fan motor switch signal.
AIR COND SW “On/Off” Di splays “COMP (On)/COMP (Off)” status as judged from air conditioner switch signal.
*1AT C - 5 0 , "Operational Check"
SHA900E
Symptom Reference Page
A/C system does not come on. Go to Trouble Diagnosis Procedure for A/C System. AT C - 5 2 , "
Power
Supply and Ground
Circuit for Auto
Amp"
A/C system cannot be controlled.
 Go to Integrated Display System.
 Go to Navigation System. AV- 7 9 , "
Unable to
Operate System
with A/C and AV
Switch" (Without
navigation system)
or AV- 1 2 7 , "
Unable
to Operate System
with A/C and AV
Switch" (With navi-
gation system)
Air outlet does not change. Go to Trouble Diagnosis Procedure for Mode Door Motor. (LAN) AT C - 5 7 , "
Mode
Door Motor Circuit"Mode door motor does not operate normally.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor. (LAN) AT C - 5 9 , "
Air Mix
Door Motor Circuit"Air mix door motor does not operate normal-
ly.
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C