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LAN

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K ELECTRICAL

SECTION LAN LAN SYSTEM
B

E
CONTENTS
CAN CAN SYSTEM (FOR A/T MODELS) ........................ 27 . F
System Description ................................................ 27 .
PRECAUTIONS ......................................................... 3 . Component Parts and Harness Connector Location 27 ...
Precautions for Supplemental Restraint System Wiring Diagram -- CAN -- .................................... 28 . G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Work Flow .............................................................. 30
.
SIONER" ................................................................. 3
. CHECK SHEET .................................................. 31 .
Precautions For Trouble Diagnosis ......................... 3 . CHECK SHEET RESULTS (EXAMPLE) ............ 32 .
CAN SYSTEM ...................................................... 3 . H
INSPECTION ..................................................... 33 .
Precautions For Harness Repair ............................. 3 . Circuit Check Between TCM and Combination
CAN SYSTEM ...................................................... 3 . Meter ..................................................................... 34
.
CAN COMMUNICATION ........................................... 4 . Circuit Check Between Combination Meter and I
System Description ................................................. 4 . BCM ....................................................................... 35
.
FOR TCS MODELS ............................................. 4 . ECM Circuit Check ................................................ 36 .
FOR A/T MODELS ............................................... 5 . TCM Circuit Check ................................................ 37 . J
FOR M/T MODELS .............................................. 6 . Combination Meter Circuit Check .......................... 37 .
CAN SYSTEM (FOR TCS MODELS) ........................ 8 . BCM Circuit Check ................................................ 38 .
System Description ................................................. 8 . IPDM E/R Circuit Check ........................................ 38 .
Component Parts and Harness Connector Location 8 ..... LAN
CAN Communication Circuit Check ....................... 39 .
Wiring Diagram -- CAN -- ...................................... 9 . IPDM E/R Ignition Relay Circuit Check ................. 42 .
Work Flow ..............................................................11
. IPDM E/R Check ................................................... 42 .
CHECK SHEET .................................................. 12 . Component Inspection ........................................... 42 . L
CHECK SHEET RESULTS (EXAMPLE) ............ 13 . ECM/IPDM E/R INTERNAL CIRCUIT INSPEC-
INSPECTION ..................................................... 15 . TION ................................................................... 42
.
Circuit Check Between TCM and Combination CAN SYSTEM (FOR M/T MODELS) ....................... 43 . M
Meter ..................................................................... 16
. System Description ................................................ 43 .
Circuit Check Between Combination Meter and Component Parts and Harness Connector Location 43 ...
BCM ...................................................................... 17
. Wiring Diagram -- CAN -- .................................... 44 .
Circuit Check Between BCM and ABS Actuator and Work Flow .............................................................. 46
.
Electric Unit (Control Unit) ..................................... 18 . CHECK SHEET .................................................. 47 .
ECM Circuit Check ................................................ 20 . CHECK SHEET RESULTS (EXAMPLE) ............ 48 .
TCM Circuit Check ................................................ 20 . INSPECTION ..................................................... 48 .
Combination Meter Circuit Check ......................... 21 . Circuit Check Between Combination Meter and
BCM Circuit Check ................................................ 21 . BCM ....................................................................... 49
.
ABS Actuator and Electric Unit (Control Unit) Circuit ECM Circuit Check ................................................ 50 .
Check .................................................................... 22
. Combination Meter Circuit Check .......................... 50 .
IPDM E/R Circuit Check ........................................ 22 . BCM Circuit Check ................................................ 51 .
CAN Communication Circuit Check ...................... 23 . IPDM E/R Circuit Check ........................................ 51 .
IPDM E/R Ignition Relay Circuit Check ................. 26 . CAN Communication Circuit Check ....................... 52 .
Component Inspection .......................................... 26 . Component Inspection ........................................... 55 .
ECM/IPDM E/R INTERNAL CIRCUIT INSPEC- ECM/IPDM E/R INTERNAL CIRCUIT INSPEC-
TION ................................................................... 26
.

LAN-1
TION ................................................................... 55
.

LAN-2
PRECAUTIONS
[CAN]
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS002JG

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. Information necessary to service the system safely is included in the SRS and SB section of
this Service Manual. C
WARNING:
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. D
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. E
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 harness connec-
tors. F
Precautions For Trouble Diagnosis EKS002JH

CAN SYSTEM
G
q Do not apply voltage of 7.0V or higher to the measurement terminals.
q Use the tester with its open terminal voltage being 7.0V or less.
q Be sure to turn ignition switch off and disconnect negative battery terminal before checking the circuit. H
Precautions For Harness Repair EKS002JI

CAN SYSTEM
q Solder the repaired parts, and wrap with tape. [Frays of twisted I
line must be within 110 mm (4.33 in)]

LAN

PKIA0306E
L

q Do not perform bypass wire connections for the repair parts.
(The spliced wire will become separated and the characteristics M
of twisted line will be lost.)

PKIA0307E

LAN-3
CAN COMMUNICATION
[CAN]
CAN COMMUNICATION PFP:23710

System Description EKS003ZH

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-
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 TCS MODELS
System diagram

LKIA0015E

Input/output signal chart
T: Transmit R: Receive
COMBINA-
ABS/TCS
Signals ECM TCM TION BCM IPDM E/R
control unit
METER
Engine speed signal T R R
Engine coolant temperature signal T R
Accelerator pedal position signal T
Fuel consumption monitor signal T R
A/T warning lamp signal T R
A/T position indicator signal R T R R(R range only) R

ABS operation signal R T
TCS operation signal R R T
Air conditioner switch signal R T
Air conditioner compressor signal R T
A/C compressor request signal T R
Cooling fan motor operation signal R T
Cooling fan speed request signal T R
Position lights request R T R
Position lights status R T
Low beam request T R
Low beam status R R T
High beam request R T R
High beam status R R T
Front fog lights request T R
Front fog light status R T
OD cancel switch signal R T R
Brake switch signal R T

LAN-4
CAN COMMUNICATION
[CAN]
COMBINA-
ABS/TCS
Signals ECM TCM TION BCM IPDM E/R A
control unit
METER
R T
Vehicle speed signal
R T R B
Oil pressure switch R T
Sleep request1 R T
C
Sleep request2 T R
N range switch signal R T
P range switch signal R T D
Seat belt buckle switch signal T R
Door switch signal R T R
E
Tail lamp request R T R
Turn indicator signal R T
Buzzer output signal R T F
Trunk switch signal R T
ASCD main switch signal T R
ASCD cruise signal T R
G

Wiper operation R T
Wiper stop position signal R T H
Rear window defogger switch signal T R
Rear window defogger control sig-
R R T
nal I
FOR A/T MODELS
System diagram
J

LAN

M
LKIA0017E

Input/output signal chart
T: Transmit R: Receive
COMBINATION
Signals ECM TCM BCM IPDM E/R
METER
Engine speed signal T R
Engine coolant temperature signal T R
Accelerator pedal position signal T R
Fuel consumption monitor signal T R
A/T warning lamp signal T R
A/T position indicator signal R T R R(R range only)
Air conditioner switch signal R T
Air conditioner compressor signal R T
A/C compressor request signal T R

LAN-5
CAN COMMUNICATION
[CAN]
COMBINATION
Signals ECM TCM BCM IPDM E/R
METER
Blower fan switch signal R(QR25DE) T
Cooling fan motor operation signal R T
Cooling fan speed request signal T R
Position lights request R T R
Position lights status R T
Low beam request T R
Low beam status R R T
High beam request R T R
High beam status R R T
Front fog lights request T R
Front fog light status R T
OD cancel switch signal R T R
Brake switch signal R T
R T
Vehicle speed signal
R T R
Oil pressure switch R T
Sleep request1 R T
Sleep request2 T R
N range switch signal R T
P range switch signal R T
Seat belt buckle switch signal T R
Door switch signal R T R
Tail lamp request R T R
Turn indicator signal R T
Buzzer output signal R T
Trunk switch signal R T
ASCD main switch signal T R
ASCD cruise signal T R
Wiper operation R T
Wiper stop position signal R T
Rear window defogger switch signal T R
Rear window defogger control signal R R T

FOR M/T MODELS
System diagram

LKIA0018E

LAN-6
CAN COMMUNICATION
[CAN]
Input/output signal chart
T: Transmit R: Receive A
COMBINATION
Signals ECM BCM IPDM E/R
METER
Engine speed signal T B
Engine coolant temperature signal T
Fuel consumption monitor signal T
C
Air conditioner switch signal R T
Air conditioner compressor signal R T
A/C compressor request signal T R D
Blower fan switch signal (QR25DE) T
R
Cooling fan motor operation signal R T
E
Cooling fan speed request signal T R
Position lights request R T R
Position lights status R T F
Low beam request T R
Low beam status R R T
High beam request R T R G
High beam status R R T
Front fog lights request T R
H
Front fog light status R T
Vehicle speed signal R T
Oil pressure switch R T I
Sleep request1 R T
Sleep request2 T R
J
Seat belt buckle switch signal T R
Door switch signal R T R
Tail lamp request R T R LAN
Turn indicator signal R T
Buzzer output signal R T
L
Trunk switch signal R T
ASCD main switch signal T R
ASCD cruise signal T R M
Wiper operation R T
Wiper stop position signal R T
Rear window defogger switch signal T R
Rear window defogger control signal R R T

LAN-7
CAN SYSTEM (FOR TCS MODELS)
[CAN]
CAN SYSTEM (FOR TCS MODELS) PFP:23710

System Description EKS003ZI

WKIA0386E

LAN-8
CAN SYSTEM (FOR TCS MODELS)
[CAN]
Wiring Diagram -- CAN -- EKS003ZK

LAN

WKWA0298E

LAN-9
CAN SYSTEM (FOR TCS MODELS)
[CAN]

LKWA0065E

LAN-10
CAN SYSTEM (FOR TCS MODELS)
[CAN]
Work Flow EKS003ZL

A
1. Print all the data of "SELF-DIAG RESULTS" and "DATA MONITOR" for "ENGINE", "A/T", "BCM", and
"ABS" displayed on CONSULT-II. Refer to EC-730 for "ENGINE" and AT-40 for "A/T". Refer to BCS-14
for "BCM". Refer to BRC-15 for "ABS".
2. Attach the printed sheet of "SELF-DIAG RESULTS" and "DATA MONITOR" onto the check sheet. Refer B
to LAN-12, "CHECK SHEET" .
3. Based on the data monitor results, put check marks onto the items with "UNKWN" or "NG" in the check
sheet table. Refer to LAN-12, "CHECK SHEET" . C
NOTE:
If "NG" is displayed on "CAN COMM" for the diagnosed control unit, replace the control unit.
4. According to the check sheet results (example), start inspection. Refer to LAN-13, "CHECK SHEET D
RESULTS (EXAMPLE)" .

LAN

LAN-11
CAN SYSTEM (FOR TCS MODELS)
[CAN]
CHECK SHEET

LKIA0040E

LAN-12
CAN SYSTEM (FOR TCS MODELS)
[CAN]
CHECK SHEET RESULTS (EXAMPLE)
A

LAN

LKIA0041E

LAN-13
CAN SYSTEM (FOR TCS MODELS)
[CAN]

LKIA0042E

LAN-14
CAN SYSTEM (FOR TCS MODELS)
[CAN]

LKIA0043E

NOTE: I
If "NG" is displayed on "CAN COMM" for the diagnosed control unit, replace the control unit.
INSPECTION J
Proceed trouble diagnosis according to the check sheet results (example).
Case 1: Replace ECM.
Case 2: Replace TCM.
Case 3: Replace BCM. LAN
Case 4: Replace ABS actuator and electric unit (control unit). Refer to BRC-90, "Removal and Installation" .
Case 5: Check harness between TCM and combination meter. Refer to LAN-16, "Circuit Check Between TCM
and Combination Meter" . L
Case 6: Check harness between combination meter and BCM. Refer to LAN-17, "Circuit Check Between
Combination Meter and BCM" .
Case 7: Check harness between BCM and ABS actuator and electric unit (control unit). Refer to LAN-18, "Cir-
M
cuit Check Between BCM and ABS Actuator and Electric Unit (Control Unit)" .
Case 8: Check ECM circuit. Refer to LAN-20, "ECM Circuit Check" .
Case 9: Check TCM circuit. Refer to LAN-20, "TCM Circuit Check" .
Case 10: Check combination meter circuit. Refer to LAN-21, "Combination Meter Circuit Check" .
Case 11: Check BCM circuit. Refer to LAN-21, "BCM Circuit Check" .
Case 12: Check ABS actuator and electric unit (control unit) circuit. Refer to LAN-22, "ABS Actuator and Elec-
tric Unit (Control Unit) Circuit Check" .
Case 13: Check IPDM E/R circuit. Refer to LAN-22, "IPDM E/R Circuit Check" .
Case 14: Check CAN communication circuit. Refer to LAN-23, "CAN Communication Circuit Check" .
Case 15: Check IPDM E/R ignition relay circuit. Refer to LAN-26, "IPDM E/R Ignition Relay Circuit Check" .

LAN-15
CAN SYSTEM (FOR TCS MODELS)
[CAN]
Circuit Check Between TCM and Combination Meter EKS003ZM

1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect the negative battery terminal.
3. Check following terminals and connector for damage, bent or loose connection (control module-side,
meter-side and harness-side).
q TCM.
q Combination meter.
q Between TCM and combination meter.
OK or NG
OK >> GO TO 2.
NG >> Repair terminal or connector.

2. CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect TCM connector and harness connector F59.
2. Check continuity between TCM harness connector F56 termi-
nals 5 (L), 6 (Y) and harness connector F59 terminals 23 (L), 22
(Y).
5 (L)

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