2007 INFINITI FX35 BCM

ACS-8
[ICC]
DESCRIPTION
Revision: 2006 July 2007 FX35/FX45
ABS actuator
and electric
unit (control
unit) VHCL SPEED SE
[km/h] or [mph] × Indicates vehicle speed calculated from wheel sensor by ICC unit through CAN commu-
nication (ABS actuator and electric unit (control unit) transmits wheel speed sensor sig-
nal through CAN communication).
BCM WIPER SW
[OFF/LOW/HIGH] ×
Indicates wiper [OFF/LOW/HIGH] status (BCM transmits front wiper request signal
through CAN communication).
Brake pres-
sure sensor PRESS SENS
[bar] Indicates brake fluid pressure value calculated from signal voltage of pressure sensor.
Release
switch RELEASE SW NO
[ON/OFF] Indicates [ON/OFF] status as judged from release switch signal.
ON when brake is depressed.
OFF when brake is not depressed.
RELEASE SW NC
[ON/OFF] Indicates [ON/OFF] status as judged from release switch signal.
ON when brake is not depressed.
OFF when brake is depressed.
ICC brake
switch BRAKE SW
[ON/OFF] Indicates [ON/OFF] status as judged from ICC brake switch signal.
Stop lamp
switch STOP LAMP SW
[ON/OFF] Indicates [ON/OFF] status as judged from stop lamp switch signal.
Input
Data monitored
Item [unit] CAN Description
OutputData monitored
Item [unit] CAN Description
ICC warning
chime BUZZER O/P
[ON/OFF] ×
Indicates [ON/OFF] status of ICC warning chime output.
ICC brake hold
relay STP LMP DRIVE
[ON/OFF] Indicates [ON/OFF] status of brake hold relay drive output.
Output CONSULT-ll ICC
[ACTIVE TEST] Item CAN Description
Combination
meter ICC BUZZER 1
×Able to start ICC warning chime with a driving signal from ICC unit.
METER LAMP ×Able to turn ICC system display ON with a driving signal from ICC unit.
ICC brake hold
relay STOP LAMP Able to start ICC brake hold relay with a driving signal from ICC unit.
Booster sole-
noid BOOSTER SOL/V
3 Able to start booster solenoid with a driving signal from ICC unit.

DESCRIPTION ACS-9
[ICC]
C
D E
F
G H
I
J
L
M A
B
ACS
Revision: 2006 July 2007 FX35/FX45
Components DescriptionNKS003EL
CAN CommunicationNKS003EM
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 speed and excellent error detection ability. Many elec-
tric 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.
CAN COMMUNICATION UNIT
Refer to LAN-49, "CAN System Specification Chart" .
Component Vehicle-to-
vehicle
distance
control mode Conventional
(fixed speed) cruise
control mode Brake assist
(with pre-
view func- tion) Description
ICC unit ××× Operates electric throttle control actuator and brake
booster based on that sensor signals and CAN commu-
nication data, then controls vehicle distance.
ICC sensor ×× Irradiates laser beam, and receives reflected laser
beam to measure distance from preceding vehicle.
ECM ××× Transmits throttle position signal and ICC steering
switch signal to ICC unit through CAN communication.
ABS actuator and electric
unit (control unit) ×××
Transmits wheel speed sensor signal to ICC unit
through CAN communication.
Brake pressure sensor ×× Detects fluid pressure in master cylinder.
Brake booster ×× Adjusts brake fluid pressure, based on command from
ICC unit.
BCM × Transmit front wiper request signal to ICC unit through
CAN communication.
TCM ×× Transmits gear position signal and output shaft revolu-
tion signal to ICC unit through CAN communication.
Unified meter and A/C amp. ××× Receives ICC system display signal, ICC warning lamp
signal and buzzer output signal from ICC unit through
CAN communication.
ICC brake switch, stop
lamp switch ××× Transmit operating signal to ICC unit when touching
brake pedal. ICC unit cancels cruise system at driver's
brake operation.
ICC brake hold relay × Receives stop lamp driving signal from ICC unit, and
turns stop lamp ON.
Parking brake switch ×× The cruise system is cancelled when applied.

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION ACS-33
[ICC]
C
D E
F
G H
I
J
L
M A
B
ACS
Revision: 2006 July 2007 FX35/FX45
DATA MONITOR
Operation Procedure
1. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen. Refer to GI-38, "
CONSULT-II Start Procedure" .
2. Touch any of “ECU INPUT SIGNALS”, “MAIN SIGNALS” and “SELECTION FROM MENU” on selection screen.
3. Touch “START”.
4. Display the data monitor.
5. If necessary, touch “COPY” in turn, and print data.
Monitored Item
× : Applicable
PKIB0112E
Monitored Item
[unit] ECU INPUT
SIGNALS MAIN
SIGNALS SELEC-
TION FROM MENU Description
VHCL SPEED SE
[km/h] or [mph] ××× Indicates vehicle speed calculated from ICC unit through CAN
communication [ABS actuator and electric unit (control unit)
transmits wheel speed sensor signal through CAN communica-
tion].
SET VHCL SPD
[km/h] or [mph] ××Indicates set vehicle speed memorized in ICC unit.
THRTL OPENING
[%] ××× Indicates throttle angle read from ICC unit through CAN commu-
nication (ECM transmits throttle angle through CAN communi-
cation).
ENGINE RPM
[rpm] ×× Indicates engine speed read from ICC unit through CAN com-
munication (ECM transmits engine speed through CAN commu-
nication).
DISTANCE ADJ
[SHOR/MID/LONG] ××× Indicates set distance memorized in ICC unit.
WIPER SW
[OFF/LOW/HIGH] ×× Indicates wiper [OFF/LOW/HIGH] status (BCM transmits front
wiper request signal through CAN communication).
MAIN SW
[ON/OFF] ××× Indicates [ON/OFF] status as judged from ICC steering switch
signal (ECM transmits ICC steering switch signal through CAN
communication).
SET/COAST SW
[ON/OFF] ××× Indicates [ON/OFF] status as judged from ICC steering switch
signal (ECM transmits ICC steering switch signal through CAN
communication).
CANCEL SW
[ON/OFF] ××× Indicates [ON/OFF] status as judged from ICC steering switch
signal (ECM transmits ICC steering switch signal through CAN
communication).
RESUME/ACC SW
[ON/OFF] ××× Indicates [ON/OFF] status as judged from ICC steering switch
signal (ECM transmits ICC steering switch signal through CAN
communication).
CRUISE OPE
[ON/OFF] ××
Indicates whether controlling or not (ON means “controlling”).
BRAKE SW
[ON/OFF] ××× Indicates [ON/OFF] status as judged from ICC brake switch sig-
nal.
STOP LAMP SW
[ON/OFF] ××× Indicates [ON/OFF] status as judged from stop lamp switch sig-
nal.
RELEASE SW NO
[ON/OFF] ×× Indicates [ON/OFF] status as judged from release switch signal.
ON when brake is depressed.
OFF when brake is not depressed.

ATC-2Revision: 2006 July 2007 FX35/FX45
A/C SWITCH ....................................................
... 35
MODE SWITCH ................................................ ... 35
FAN SWITCH ................................................... ... 35
DUAL SWITCH ................................................. ... 35
Fail-safe Function ................................................ ... 36
Discharge Air Flow .............................................. ... 37
System Description .............................................. ... 38
SWITCHES AND THEIR CONTROL FUNCTION ... 38
CAN Communication System Description ........... ... 39
TROUBLE DIAGNOSIS ......................................... ... 40
CONSULT-II Function (BCM) ............................... ... 40
CONSULT-II BASIC OPERATION .................... ... 40
DATA MONITOR ............................................... ... 40
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ................................................... ... 40
WORK FLOW ................................................... ... 40
SYMPTOM TABLE ........................................... ... 41
Component Parts and Harness Connector Location ... 42
ENGINE COMPARTMENT ............................... ... 42
PASSENGER COMPARTMENT ....................... ... 43
Schematic ............................................................ ... 44
Wiring Diagram — A/C — .................................... ... 45
Auto Amp. Terminals and Reference Value ......... ... 50
PIN CONNECTOR TERMINAL LAYOUT ......... ... 50
TERMINALS AND REFERENCE VALUE FOR
UNIFIED METER AND A/C AMP. ..................... ... 50
Self-diagnosis Function ....................................... ... 52
DESCRIPTION ................................................. ... 52
FUNCTION CONFIRMATION PROCEDURE ... ... 53
AUXILIARY MECHANISM: TEMPERATURE
SETTING TRIMMER ........................................ ... 58
AUXILIARY MECHANISM: FOOT POSITION
SETTING TRIMMER ........................................ ... 59
AUXILIARY MECHANISM: INLET PORT MEM-
ORY FUNCTION .............................................. ... 59
Operational Check ............................................... ... 60
CHECKING MEMORY FUNCTION .................. ... 60
CHECKING BLOWER ...................................... ... 60
CHECKING DISCHARGE AIR ......................... ... 60
CHECKING INTAKE AIR .................................. ... 60
CHECKING TEMPERATURE DECREASE ...... ... 60
CHECKING TEMPERATURE INCREASE ....... ... 60
CHECKING A/C SWITCH ................................ ... 61
CHECKING AUTO MODE ................................ ... 61
Power Supply and Ground Circuit for Auto Amp. ... 62 INSPECTION FLOW ........................................ ... 62
COMPONENT DESCRIPTION ......................... ... 62
DIAGNOSIS PROCEDURE FOR A/C SYSTEM ... 63
LAN System Circuit ............................................. ... 64
DIAGNOSIS PROCEDURE FOR LAN CIRCUIT ... 64
Mode Door Motor Circuit ..................................... ... 68
INSPECTION FLOW ........................................ ... 68
SYSTEM DESCRIPTION ................................. ... 69
COMPONENT DESCRIPTION ......................... ... 70
DIAGNOSIS PROCEDURE FOR MODE DOOR
MOTOR ............................................................ ... 70
Air Mix Door Motor Circuit ................................... ... 71
INSPECTION FLOW ........................................ ... 71 SYSTEM DESCRIPTION ..................................
... 72
COMPONENT DESCRIPTION ......................... ... 73
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR ............................................................. ... 73
Air Mix Door Motor PBR Circuit ........................... ... 73
DIAGNOSIS PROCEDURE FOR AIR MIX DOOR
MOTOR PBR .................................................... ... 73
Intake Door Motor Circuit ..................................... ... 74
INSPECTION FLOW ......................................... ... 74
SYSTEM DESCRIPTION .................................. ... 75
COMPONENT DESCRIPTION ......................... ... 76
DIAGNOSIS PROCEDURE FOR INTAKE DOOR
MOTOR ............................................................. ... 76
Blower Motor Circuit ............................................. ... 77
INSPECTION FLOW ......................................... ... 77
SYSTEM DESCRIPTION .................................. ... 78
COMPONENT DESCRIPTION ......................... ... 79
DIAGNOSIS PROCEDURE FOR BLOWER
MOTOR ............................................................. ... 79
COMPONENT INSPECTION ............................ ... 81
Magnet Clutch Circuit ........................................... ... 82
INSPECTION FLOW ......................................... ... 82
SYSTEM DESCRIPTION .................................. ... 83
DIAGNOSIS PROCEDURE FOR MAGNET
CLUTCH ........................................................... ... 83
COMPONENT INSPECTION ............................ ... 89
Insufficient Cooling ............................................... ... 90
INSPECTION FLOW ......................................... ... 90
PERFORMANCE TEST DIAGNOSIS ............... ... 92
PERFORMANCE CHART ................................. ... 94
TROUBLE DIAGNOSIS FOR UNUSUAL PRES-
SURE ................................................................ ... 95
DIAGNOSIS PROCEDURE FOR INSUFFI-
CIENT COOLING .............................................. ... 97
Insufficient Heating .............................................. ... 99
INSPECTION FLOW ......................................... ... 99
Noise .................................................................... .100
INSPECTION FLOW ......................................... .100
Self-diagnosis ...................................................... .101
INSPECTION FLOW ......................................... .101
Memory Function ................................................. .102
INSPECTION FLOW ......................................... .102
Ambient Sensor Circuit ........................................ .103
COMPONENT DESCRIPTION ......................... .103
AMBIENT TEMPERATURE INPUT PROCESS .103
DIAGNOSIS PROCEDURE FOR AMBIENT
SENSOR ........................................................... .103
COMPONENT INSPECTION ............................ .105
In-vehicle Sensor Circuit ...................................... .106
COMPONENT DESCRIPTION ......................... .106
DIAGNOSIS PROCEDURE FOR IN-VEHICLE
SENSOR ........................................................... .107
COMPONENT INSPECTION ............................ .108
Sunload Sensor Circuit ........................................ .109
COMPONENT DESCRIPTION ......................... .109
SUNLOAD INPUT PROCESS .......................... .109
DIAGNOSIS PROCEDURE FOR SUNLOAD
SENSOR ........................................................... .109

AIR CONDITIONER CONTROL ATC-33
C
D E
F
G H
I
K L
M A
B
AT C
Revision: 2006 July 2007 FX35/FX45
MAGNET CLUTCH CONTROL
When A/C switch, AUTO switch or DEF switch is pressed, 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 compressor 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 meter and A/C amp. to quickly locate the cause of malfunc-
tions.
RJIA1957E

ATC-40
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
TROUBLE DIAGNOSISPFP:00004
CONSULT-II Function (BCM)NJS000DU
CONSULT-II can display each diagnosis item using the diagnosis test modes shown following.
CONSULT-II BASIC OPERATION
Refer to GI-38, "CONSULT-II Start Procedure" .
DATA MONITOR
Operation Procedure
1. Touch “AIR CONDITIONER” on “SELECT TEST ITEM” screen.
2. Touch “DATA MONITOR” on “SELECT DIAG MODE” screen.
3. Touch either “ALL SIGNALS” or “SELECTION FROM MENU” on “DATA MONITOR” screen.
4. When “SELECTION FROM MENU” is selected, touch items to be monitored. When “ALL SIGNALS” is selected, all the items will be monitored.
5. Touch “START”.
6. Touch “RECORD” while monitoring, then the status of the monitored item can be recorded. To stop recording, touch “STOP”.
Display Item List
How to Perform Trouble Diagnosis for Quick and Accurate RepairNJS000DV
WORK FLOW
System part Check item, diagnosis mode Description
BCM Data monitor Displays BCM input data in real time.
All signals Monitors all the items.
Selection from menu Selects and monitors the individual item selected.
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” Displays “COMP (ON)/COMP (OFF)” status as judged from air conditioner switch signal.
*1 ATC-60, "Operational Check"
SHA900E

TROUBLE DIAGNOSIS ATC-85
C
D E
F
G H
I
K L
M A
B
AT C
Revision: 2006 July 2007 FX35/FX45
5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL
Check compressor ON/OFF signal. Refer to AT C - 4 0 , "
CONSULT-II
Function (BCM)" .
OK or NG
OK >> GO TO 8.
NG >> GO TO 6.
6. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND UNIFIED METER AND A/C AMP.
1. Turn ignition switch OFF.
2. Disconnect BCM connector and unified meter and A/C amp. connector.
3. Check continuity between BCM harness connector M3 terminal 27 and unified meter and A/C amp. harness connector M57 ter-
minal 42.
OK or NG
OK >> GO TO 7.
NG >> Repair harness or connector. A/C SW ON : AIR COND SW ON
A/C SW OFF : AIR COND SW OFF
R J I A 1111 E
27 – 42 : Continuity should exist.
RJIA2006E

ATC-86
TROUBLE DIAGNOSIS
Revision: 2006 July 2007 FX35/FX45
7. CHECK VOLTAGE FOR UNIFIED METER AND A/C AMP. (COMPRESSOR ON SIGNAL)
1. Reconnect BCM connector and unified meter and A/C amp. connector.
2. Turn ignition switch ON.
3. Check voltage between unified meter and A/C amp. harness connector M57 terminal 42 and ground using an oscilloscope.
OK or NG
OK >> GO TO 8.
NG-1 >> If the voltage is approx. 5 V when A/C switch is ON: Replace unified meter and A/C amp.
NG-2 >> If the voltage is approx. 0 V when A/C switch is OFF: Replace BCM.
RJIA2007E
Terminals
Condition Voltage
(+)
( − )
Unified meter
and A/C amp. connector Terminal
No.
M57 42 Ground A/C switch: ON
(Blower motor operates.) Approx. 0 V
OFF switch: ON
(A/C system: OFF)
SJIA1423J