INFINITI FX35 2008 Service Manual

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ELECTRICAL
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CONTENTS
BODY CONTROL SYSTEM
SERVICE INFORMATION .. ..........................2
DTC INDEX ..................................................... .....2
U1000 .................................................................. ......2
PRECAUTIONS ...................................................3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
BCM (BODY CONTROL MODULE) ..................4
System Description .............................................. .....4
CAN Communication Unit .........................................9
Schematic ................................................................10
CONSULT-III Function (BCM) .................................11
U1000 CAN Communication Circuit ........................13
Removal and Installation of BCM ............................13
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BCS-2
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DTC INDEX
SERVICE INFORMATION
DTC INDEX
U1000INFOID:0000000001351357
DTC Items (CONSULT screen terms) Reference
U1000 CAN COMM CIRCUIT BCS-13, "
U1000 CAN Communication Circuit"
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PRECAUTIONSBCS-3
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PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000001612912
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SUPPLEMENTAL RESTRAINT SYS-
TEM” and “SEAT BELTS” of this Service Manual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
 Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the “SUPPLEMEN TAL RESTRAINT SYSTEM”.
 Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
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BCS-4
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BCM (BODY CONTROL MODULE)
BCM (BODY CONTROL MODULE)
System DescriptionINFOID:0000000001328608
BCM (Body Control Module) controls the operation of various electrical units installed on the vehicle.
BCM FUNCTION
BCM has combination switch reading function for reading the operation of combination switches (light, wiper,
washer and turn signal) in addition to a function for cont rolling the operation of various electrical components.
Also it has an interface function allowing it to receive signals from the unified meter and A/C amp., and send
signals to ECM using CAN communication.
COMBINATION SWITCH READING FUNCTION
Description
 BCM reads combination switch (lighting switch, wiper switch) status, and controls various electrical compo-
nent according to the result.
 BCM reads information of a maximum of 20 switches by combining five output terminals (OUTPUT 1-5) and
five input terminals (INPUT 1-5).
Operation Description
 BCM activates transistors of output terminals (OUTPUT 1-5) periodically, and allows current to flow in turn.
 If any (1 or more) switches are turned ON, circui t of output terminals (OUTPUT 1-5) and input terminals
(INPUT 1-5) becomes active.
 At this time, transistors of output terminals (OUTPUT 1- 5) are activated to allow current to flow. When volt-
age of input terminals (INPUT 1-5) corresponding to t hat switch changes, interface in BCM detects voltage
change, and BCM determines that switch is ON.
Operation Table Of BCM and Combination Switches
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BCM (BODY CONTROL MODULE)BCS-5
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BCM reads operation status of combination swit ch using combinations shown in table below.
NOTE:
Headlamp system has a dual switch.
Sample Operation: (When Lighting Switch 1ST Position Turned ON)
 When lighting switch 1ST position is turned ON, contact in combination switch turns ON. At this time if OUT-
PUT 4 transistor is activated, BCM detects that voltage changes in INPUT 5.
 When OUTPUT 4 transistor is ON, BCM detects that voltage changes in INPUT 5, and judges that lighting
switch 1ST position is ON. Then BCM sends tail lamp and clearance lamp request signal to IPDM E/R using
CAN communication.
 When OUTPUT 4 transistor is activated again, BCM detects that voltage changes in INPUT 5, and recog-
nizes that lighting switch 1S T position is continuously ON.
NOTE:
Each OUTPUT terminal transistor is activated at 10 ms intervals. Therefore after switch is turned ON, electri-
cal loads are activated with time delay. But this time delay is so short that it cannot be detected by human
senses.
Operation Mode
Combination switch reading function has operation modes shown below.
1. Normal status When BCM is not in sleep status, OUTPUT terminals (1-5) send out ON signal every 10 ms.
2. Sleep status
SKIA4959E
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BCS-6
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BCM (BODY CONTROL MODULE)
When BCM is in sleep status, transistors of OUTPUT 1 and 5 stop the output, and BCM enters low power
mode. Mean while OUTPUT 2, 3, and 4 send out ON signal every 60 ms, and accept input from lighting
switch system.
CAN COMMUNICATION CONTROL
CAN communication allows a high rate of information transmission through the two communication lines (CAN
L line, CAN H line) connecting the various control units in the system. Each control unit transmits/receives
data but selectively reads required data only. For details of signals that are transmitted/received by BCM via
CAN communication, refer to LAN-43, "
CAN System Specification Chart".
BCM STATUS CONTROL
BCM changes its status depending on the operation stat us in order to save power consumption.
1. CAN communication status  With ignition switch ON, CAN communicates with other control units normally.
 Control by BCM is being operated properly.
 When ignition switch is OFF, switching to sleep mode is possible.
 Even when ignition switch is OFF, if CAN communication with IPDM E/R and combination meter isactive, CAN communication status is active.
2. Sleep transient status  This status shuts down CAN communication when ignition switch is turned OFF.
 It transmits sleep request signal to IPDM E/R and combination meter.
 2 seconds after CAN communication of all control units stops, sleep transient status is switched to CAN
communication inactive status.
3. CAN communication inactive status  With ignition switch OFF, CAN communication is not active.
 With ignition switch OFF, control performed only by BCM is active.
 3 seconds after CAN communication of all control units stops, CAN communication inactive status is
switched to sleep status.
4. Sleep status  BCM is activated with low power mode.
 CAN communication is not active.
 When CAN communication operation is detected, it switches to CAN communication status.
 When a state of the following switches changes , it switches to CAN communication state.
- Key switch
- Hazard switch
PKIC4919E
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BCM (BODY CONTROL MODULE)BCS-7
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- Door lock/unlock switch
- Front door switch (driver side, passenger side)
- Rear door switch (LH, RH)
- Back door opener switch
- Combination switch (passing, lighting switch 1ST position, front fog lamp)
- Key fob (lock/unlock signal)
- Key cylinder switch
 When control performed only by BCM is required by switch, it shifts to CAN communication inactive mode.
 Operation mode of combination switch reading function is changed.
SYSTEMS CONTROLLED BY BCM DIRECTLY
NOTE:
Power supply only. No system control.
SYSTEMS CONTROLLED BY BCM AND IPDM E/R
SYSTEMS CONTROLLED BY BCM AND COMBINATION METER
SYSTEMS CONTROLLED BY BCM AND INTELLIGENT KEY UNIT
SYSTEMS CONTROLLED BY BCM, CO MBINATION METER AND IPDM E/R
System Reference
Power door lock system BL-21
Remote keyless entry systemBL-50
Power window system NOTEGW-15
Sunroof NOTERF-10
Room lamp timerLT- 1 3 8
Rear wiper and washer systemWW-30
System Reference
Panic alarm 
BL-50
BL-76
Theft warning system BL-163
IVIS (NATS)BL-185
HeadlampLT- 5
Daytime light systemLT- 3 2
Auto light systemLT- 4 7
Front fog lampLT- 6 6
 Parking, license plate, side marker and tail lamps
 Exterior lamp battery saver control LT- 11 8
Front wiper and washer system
WW-4
Rear window defoggerGW-60
System Reference
Warning chime DI-51
Turn signal and hazard warning lampsLT- 7 8
Tire pressure monitoring systemWT-10
System Reference
Intelligent Key system BL-76
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BCS-8
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BCM (BODY CONTROL MODULE)
MAJOR COMPONENTS AND CONTROL SYSTEM
System Reference
Oil pressure warning lamp DI-34
System Input Output
Remote control entry system Key fob  All-door locking actuator
 Fuel lid Lock actuator
 Turn signal lamp (LH, RH)
 Combination meter
Intelligent Key system Intelligent Key unit  All-door locking actuator
 Fuel lid Lock actuator
 Turn signal lamp (LH, RH)
 Combination meter
Power door lock system  Power window main switch
(door lock and unlock switch)
 Power window sub switch (passenger side) (door lock and unlock switch) All-door locking actuator
Power supply (IGN) to power window, sunroof Ignition power supply Power window and sunroof system
Power supply (BAT) to power window, sunroof
and power seat Battery power supplyPower window, sunroof system and
power seat
Panic alarm  Key switch
 Key fobIPDM E/R
Theft warning system  All-door switch
 Hood switch
 Key fob
 Power window main switch (door lock and
unlock switch)
 Power window sub switch (passenger side) (door lock and unlock switch)  IPDM E/R
 Security indicator lamp
Auto light system  Optical sensor
 Combination switch
 Ignition switchIPDM E/R
Exterior lamp battery saver control  Ignition switch
 Combination switchIPDM E/R
Headlamp Combination switch IPDM E/R
Daytime light system  Combination meter
ECM
 Combination switch
 Ignition switchIPDM E/R
Parking, license plate, side marker and tail
lamps Combination switch IPDM E/R
Front fog lamp Combination switch IPDM E/R
Turn signal lamp  Combination switch
 Ignition switch Turn signal lamp
 Combination meter
Hazard lamp Hazard switch  Turn signal lamp
 Combination meter
Room lamp timer  Key switch
 Key fob
 Power window main switch (door lock and
unlock switch)
 Front door switch driver side
 All-door switch Interior room lamp
Key warning chime  Key switch
 Front door switch driver sideCombination meter
(warning buzzer)
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BCM (BODY CONTROL MODULE)BCS-9
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CAN Communication UnitINFOID:0000000001328609
Refer to LAN-43, "CAN System Specification Chart".
Light warning chime  Combination switch
 Key switch
 Front door switch driver sideCombination meter
(warning buzzer)
Seat belt warning chime  Combination meter [Seat belt buckle (driver
side) switch]
 Ignition switch Combination meter
(warning buzzer)
Front wiper and washer system  Combination switch
 Combination meter
 Ignition switchIPDM E/R
Rear wiper and washer system  Combination switch
 Ignition switchRear wiper motor
Rear window defogger  Rear window defogger switch
 Ignition switch
IPDM E/R
A/C switch signal Unified meter and A/C amp. ECM
Blower fan switch signal Unified meter and A/C amp. ECM
Low tire pressure warning system Remote keyless entry receiver Combination meter System Input Output
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BCS-10
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BCM (BODY CONTROL MODULE)
Schematic
INFOID:0000000001328610
TKWM4487E
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