Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2003_Q45 lan

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lan

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LAN SYSTEM

K ELECTRICAL

B
SECTION
LAN SYSTEM C

E
CONTENTS
LAN CAN F

PRECAUTIONS ......................................................... 3 . PRECAUTIONS ....................................................... 20.
Precautions for Supplemental Restraint System Precautions for Supplemental Restraint System
G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ................................................................. 3
. SIONER" ................................................................ 20
.
IVMS (LAN) ................................................................ 4
. Precautions For Trouble Diagnosis ....................... 20 .
Overall Description .................................................. 4
. CAN SYSTEM .................................................... 20 . H
OUTLINE .............................................................. 4
. Precautions For Harness Repair ........................... 20 .
BCM (BODY CONTROL MODULE) ..................... 4 . CAN SYSTEM .................................................... 20 .
LCU (LOCAL CONTROL UNIT) ........................... 4 . CAN COMMUNICATION .......................................... 21 . I
CONTROLLED SYSTEMS .................................. 4 . System Description ................................................ 21
.
Component Parts and Harness Connector Location 5 ..... FOR VDC MODELS ........................................... 21 .
Sleep/Wake-up Control ........................................... 5 . FOR ICC MODELS ............................................ 22 . J
SLEEP CONTROL ............................................... 5 . CAN SYSTEM (FOR VDC MODELS) ...................... 24 .
WAKE-UP CONTROL .......................................... 6 . System Description ................................................ 24
.
Fail-safe System ..................................................... 6
. Component Parts and Harness Connector Location 24 ...
CONSULT-II Function ............................................. 6 . Wiring Diagram -- CAN -- .................................... 25 . LAN
DIAGNOSTIC ITEMS DESCRIPTION ................. 6 . Work Flow .............................................................. 27
.
DIAGNOSTIC ITEMS APPLICATION .................. 7 . CHECK SHEET .................................................. 28 .
On Board Diagnosis ................................................ 7 . CHECK SHEET RESULTS (EXAMPLE) ............ 29 . L
DIAGNOSIS ITEM ................................................ 7 . Circuit Check Between VDC/TCS/ABS Control Unit
Schematic ............................................................... 8
. and Steering Angle Sensor .................................... 32 .
POWER SUPPLY, GROUND AND COMMUNI- Circuit Check Between Steering Angle Sensor and M
CATION CIRCUITS .............................................. 8 . Combination Meter ................................................ 34.
Wiring Diagram - COMM - ....................................... 9 . ECM Circuit Check ................................................ 34.
POWER SUPPLY, GROUND AND COMMUNI- VDC/TCS/ABS Control Unit Circuit Check ............ 35 .
CATION CIRCUITS .............................................. 9 . Steering Angle Sensor Circuit Check .................... 35 .
Schematic - BCM - ................................................ 14 . Combination Meter Circuit Check .......................... 36 .
Schematic - LCU01 - ............................................. 16 . TCM Circuit Check ................................................ 36.
DRIVER'S DOOR CONTROL UNIT ................... 16 . CAN Communication Circuit Check ....................... 37 .
Schematic - LCU02 - ............................................. 17 . Component Inspection ........................................... 41 .
DRIVER'S SEAT CONTROL UNIT .................... 17 . ECM/TCM INTERNAL CIRCUIT INSPECTION... 41
Schematic - LCU03 - ............................................. 18 . CAN SYSTEM (FOR ICC MODELS) ....................... 42 .
DRIVER'S SIDE DOOR MIRROR CONTROL System Description ................................................ 42
.
UNIT ................................................................... 18
. Component Parts and Harness Connector Location 42 ...
Schematic - LCU04 - ............................................. 19 . Schematic .............................................................. 43
.
PASSENGER SIDE DOOR MIRROR CONTROL Wiring Diagram -- CAN -- .................................... 44 .
UNIT ................................................................... 19
. Work Flow .............................................................. 47
.
CHECK SHEET .................................................. 48 .
CHECK SHEET RESULTS (EXAMPLE) ............ 49 .

Revision; 2004 April LAN-1 2003 Q45
Circuit Check VDC/TCS/ABS Control Unit and ICC ICC Sensor Circuit Check ......................................63
.
Sensor ................................................................... 59
. ICC Unit Circuit Check ...........................................64
.
Circuit Check Between ICC sensor and ICC unit ... 60 Steering Angle Sensor Circuit Check .....................64 .
Circuit Check Between ICC unit and Steering Angle Combination Meter Circuit Check ..........................65 .
Sensor ................................................................... 61
. TCM Circuit Check .................................................65
.
Circuit Check Between Steering Angle Sensor and CAN Communication Circuit Check .......................66 .
Combination Meter ................................................ 62 . Component Inspection ...........................................70
.
ECM Circuit Check ................................................ 62 . ECM/TCM INTERNAL CIRCUIT INSPECTION ...70
VDC/TCS/ABS Control Unit Circuit Check ............ 63 .

Revision; 2004 April LAN-2 2003 Q45
PRECAUTIONS
[LAN]
PRECAUTIONS
[LAN] PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS006SI

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
with a front seat belt, helps to reduce the risk or severity 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 C
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 SRS and SB section of this Service Man-
ual.
WARNING: D
q To avoid rendering the SRS inoperative, 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 per-
formed by an authorized NISSAN/INFINITI dealer. E
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. F
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
G

LAN

Revision; 2004 April LAN-3 2003 Q45
IVMS (LAN)
[LAN]
IVMS (LAN) PFP:28491

Overall Description EKS001PD

OUTLINE
The In-Vehicle Multiplexing System, IVMS (LAN system), consists of a BCM (Body Control Module) and four
LCUs (Local Control Units). Some switches and electrical loads are connected to each LCU. Some electrical
systems are directly connected to the BCM. Control of each LCU, (which is provided by a switch and electrical
load), is accomplished by the BCM, via multiplex data lines (A-1, A-2 or A-3) connected between them.
BCM (BODY CONTROL MODULE)
The BCM, which is a master unit of the IVMS (LAN), consists of microprocessor, memory and communication
LSI sections and has communication and control functions. It receives data signals from the LCUs and sends
electrical load data signals to them.
LCU (LOCAL CONTROL UNIT)
The LCUs, which are slave units of the BCM, have only a communication function and consist of communica-
tion LSI and input-output interface circuits. They receive data signals from the BCM, control the ON/OFF oper-
ations of electrical loads and the sleep operation, as well as send switch signals to the BCM.
CONTROLLED SYSTEMS
The IVMS controls several body-electrical systems. The systems included in the IVMS are as follows:
q Power window system (Refer to GW-16, "POWER WINDOW SYSTEM" )
q Power door lock system (Refer to BL-19, "POWER DOOR LOCK SYSTEM" )
q Remote keyless entry system (Refer to BL-52, "REMOTE KEYLESS ENTRY SYSTEM" )
q Vehicle security (Theft warning) system (Refer to BL-153, "VEHICLE SECURITY (THEFT WARNING)
SYSTEM" )
q Reverse interlock door mirror system (Refer to GW-79, "REVERSE INTERLOCK DOOR MIRROR SYS-
TEM" )
q Interior room lamp (Refer to LT-81, "INTERIOR ROOM LAMP" )
q Step lamp (Refer to LT-109, "STEP LAMP" )
q Illumination (Refer to LT-131, "ILLUMINATION" )
q Automatic drive positioner (Refer to SE-13, "AUTOMATIC DRIVE POSITIONER" )
q Auto light (Refer to LT-6, "HEADLAMP (FOR USA)" )
q Door warning lamp (Refer to DI-33, "WARNING LAMPS" )
q Ignition key warning (Refer to DI-56, "WARNING CHIME" )
q Light warning (Refer to DI-56, "WARNING CHIME" )
q Seat belt warning (Refer to DI-56, "WARNING CHIME" )
q Front wiper and washer system (Refer to WW-3, "WASHER SYSTEM" )
q Rear window defogger timer (Refer to GW-59, "REAR WINDOW DEFOGGER" )
q Trouble diagnosis system
--with CONSULT-ll
--ON BOARD
Also, IVMS has the "sleep/wake-up control" function. IVMS puts itself (the whole IVMS system) to sleep under
certain conditions to prevent unnecessary power consumption. Then, when a certain input is detected, the
system wakes itself up. For more detailed information, refer to "Sleep/Wake-up Control".

Revision; 2004 April LAN-4 2003 Q45
IVMS (LAN)
[LAN]
Component Parts and Harness Connector Location EKS001PE

CKIM0010E I

Sleep/Wake-up Control EKS001PF

SLEEP CONTROL J

LAN

M
SEL465TA

"Sleep" control prevents unnecessary power consumption. After the following conditions are met, the BCM
suspends the communication between itself and all LCUs. The whole IVMS is set in the "sleep" mode.
q Ignition switch "OFF"
q All electrical loads (in the IVMS) "OFF"
q Timer "OFF"

Revision; 2004 April LAN-5 2003 Q45
IVMS (LAN)
[LAN]
WAKE-UP CONTROL

SEL466T

As shown above, when the BCM detects a "wake-up" signal, it wakes up the whole system and starts commu-
nicating again. The "sleep" mode of all LCUs is now canceled, and the BCM returns to the normal control
mode. When any one of the following switches are turned ON, the "sleep" mode is canceled:
q All switches combined or connected with BCM
q All switches combined or connected with LCU
Fail-safe System EKS001PG

Fail-safe system operates when the signal from LCU is judged to be malfunctioning by BCM. If LCU sends no
signal or an irregular signal to BCM a certain number of times in succession, the IVMS is set in a fail-safe con-
dition. In the fail-safe condition, the electrical loads controlled by the switch on the questionable LCU will be
operated at fail-safe mode.
CONSULT-II Function EKS001R9

CONSULT-II executes the following functions by combining data reception and command transmission via the
communication line from BCM. IVMS communication inspection, work support (only function setting of seats
and steering wheel), self-diagnosis, data monitor, and active test display.
DIAGNOSTIC ITEMS DESCRIPTION
IVMS diagnosis
Diagnosis mode Description
position
Diagnosis of continuity in the communication line(s), and of the function of the
IVMS

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