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K ELECTRICAL
A
B
SECTION
LAN SYSTEM C
D
E
CONTENTS
CAN CAN SYSTEM (TYPE 2) .......................................... 42 . F
System Description ................................................ 42 .
PRECAUTIONS ......................................................... 3 . Component Parts and Harness Connector Location 42 ...
Precautions for Supplemental Restraint System Schematic .............................................................. 43
. G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Wiring Diagram -- CAN -- .................................... 44 .
SIONER" ................................................................. 3
. Work Flow .............................................................. 47
.
Precautions When Using CONSULT-II .................... 3 . CHECK SHEET .................................................. 49 .
CHECK POINTS FOR USING CONSULT-II ........ 3 . H
CHECK SHEET RESULTS ................................. 51 .
Precautions for CAN System .................................. 3 . Circuit Check Between TCM and Data Link Con-
CAN COMMUNICATION ........................................... 5 . nector ..................................................................... 62
.
System Description ................................................. 5 . ECM Circuit Check ................................................ 62 . I
CAN Communication Unit ....................................... 5 . TCM Circuit Check ................................................ 63 .
TYPE 1 ................................................................. 7
. ABS Actuator and Electric Unit (Control Unit) Circuit
TYPE 2/TYPE 3 ................................................... 9 . Check .................................................................... 63
. J
TYPE 4/TYPE 5 ................................................. 12 . Front Air Control Circuit Check .............................. 64 .
CAN SYSTEM (TYPE 1) .......................................... 15 . Display Unit Circuit Check ..................................... 64 .
System Description ............................................... 15 . Data Link Connector Circuit Check ....................... 65 .
Component Parts and Harness Connector Location 15 ... LAN
BCM Circuit Check ................................................ 65 .
Schematic ............................................................. 16
. Combination Meter Circuit Check .......................... 66 .
Wiring Diagram -- CAN -- .................................... 17 . IPDM E/R Circuit Check ........................................ 66 .
Work Flow ............................................................. 20
. CAN Communication Circuit Check ....................... 67 . L
CHECK SHEET .................................................. 22 . IPDM E/R Ignition Relay Circuit Check ................. 67 .
CHECK SHEET RESULTS ................................ 24 . Component Inspection ........................................... 68 .
Circuit Check Between TCM and Data Link Con- ECM AND IPDM E/R INTERNAL CIRCUIT M
nector .................................................................... 35
. INSPECTION ..................................................... 68 .
ECM Circuit Check ................................................ 35 . CAN SYSTEM (TYPE 3) .......................................... 69 .
TCM Circuit Check ................................................ 36 . System Description ................................................ 69 .
ABS Actuator and Electric Unit (Control Unit) Circuit Component Parts and Harness Connector Location 69 ...
Check .................................................................... 36
. Schematic .............................................................. 70
.
Front Air Control Circuit Check ............................. 37 . Wiring Diagram -- CAN -- .................................... 71 .
Display Unit Circuit Check ..................................... 37 . Work Flow .............................................................. 74
.
Data Link Connector Circuit Check ....................... 38 . CHECK SHEET .................................................. 76 .
BCM Circuit Check ................................................ 38 . CHECK SHEET RESULTS ................................. 78 .
Combination Meter Circuit Check ......................... 39 . Circuit Check Between TCM and Data Link Con-
IPDM E/R Circuit Check ........................................ 39 . nector ..................................................................... 89
.
CAN Communication Circuit Check ...................... 40 . ECM Circuit Check ................................................ 89 .
IPDM E/R Ignition Relay Circuit Check ................. 40 . TCM Circuit Check ................................................ 90 .
Component Inspection .......................................... 41 . ABS Actuator and Electric Unit (Control Unit) Circuit
ECM AND IPDM E/R INTERNAL CIRCUIT Check .................................................................... 90
.
INSPECTION ..................................................... 41 . Front Air Control Circuit Check .............................. 91 .
Revision: September 2004 LAN-1 2005 Quest
Display Control Unit Circuit Check ......................... 91 . CAN Communication Circuit Check ..................... 124 .
Data Link Connector Circuit Check ........................ 92 . IPDM E/R Ignition Relay Circuit Check ................ 124 .
BCM Circuit Check ................................................ 92 . Component Inspection ......................................... 125 .
Combination Meter Circuit Check .......................... 93 . ECM AND IPDM E/R INTERNAL CIRCUIT
IPDM E/R Circuit Check ........................................ 93 . INSPECTION .................................................... 125 .
CAN Communication Circuit Check ....................... 94 . CAN SYSTEM (TYPE 5) ......................................... 126 .
IPDM E/R Ignition Relay Circuit Check .................. 94 . System Description .............................................. 126 .
Component Inspection ........................................... 95 . Component Parts and Harness Connector Location .126
ECM AND IPDM E/R INTERNAL CIRCUIT Schematic ............................................................ 127
.
INSPECTION ...................................................... 95 . Wiring Diagram -- CAN -- .................................. 128 .
CAN SYSTEM (TYPE 4) .......................................... 96 . Work Flow ............................................................ 131
.
System Description ................................................ 96 . CHECK SHEET ................................................ 133 .
Component Parts and Harness Connector Location 96 ... CHECK SHEET RESULTS ............................... 135 .
Schematic .............................................................. 97
. Circuit Check Between TCM and Data Link Con-
Wiring Diagram -- CAN -- .................................... 98 . nector ................................................................... 148
.
Work Flow ............................................................ 101
. ECM Circuit Check ............................................... 148 .
CHECK SHEET ................................................ 103 . TCM Circuit Check ............................................... 149 .
CHECK SHEET RESULTS ............................... 105 . ABS Actuator and Electric Unit (Control Unit) Circuit
Circuit Check Between TCM and Data Link Con- Check ................................................................... 149
.
nector ................................................................... 118
. Front Air Control Circuit Check ............................ 150 .
ECM Circuit Check .............................................. 118 . Display Control Unit Circuit Check ....................... 150 .
TCM Circuit Check .............................................. 119 . Data Link Connector Circuit Check ...................... 151 .
ABS Actuator and Electric Unit (Control Unit) Circuit BCM Circuit Check ............................................... 151 .
Check .................................................................. 119
. Combination Meter Circuit Check ........................ 152 .
Front Air Control Circuit Check ............................ 120 . Steering Angle Sensor Circuit Check ................... 152 .
Display Unit Circuit Check ................................... 120 . Driver Seat Control Unit Circuit Check ................. 153 .
Data Link Connector Circuit Check ...................... 121 . IPDM E/R Circuit Check ....................................... 153 .
BCM Circuit Check .............................................. 121 . CAN Communication Circuit Check ..................... 154 .
Combination Meter Circuit Check ........................ 122 . IPDM E/R Ignition Relay Circuit Check ................ 154 .
Steering Angle Sensor Circuit Check .................. 122 . Component Inspection ......................................... 155 .
Driver Seat Control Unit Circuit Check ................ 123 . ECM AND IPDM E/R INTERNAL CIRCUIT
IPDM E/R Circuit Check ...................................... 123 . INSPECTION .................................................... 155 .
Revision: September 2004 LAN-2 2005 Quest
PRECAUTIONS
[CAN]
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" UKS002EC
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
Precautions When Using CONSULT-II UKS002EE
When connecting CONSULT-II to data link connector, connect them through CONSULT-II CONVERTER.
H
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.
I
CHECK POINTS FOR USING CONSULT-II
1. Has CONSULT-II been used without connecting CONSULT-II CONVERTER on this vehicle?
q If YES, GO TO 2.
J
q If NO, GO TO 5.
2. Is there any indication other than indications relating to CAN communication system in the self-diagnosis
results? LAN
q If YES, GO TO 3.
q If NO, GO TO 4.
3. Based on self-diagnosis results unrelated to CAN communication, carry out the inspection. L
4. Malfunctions may be detected in self-diagnosis depending on control units carrying out CAN communica-
tion. Therefore, erase the self-diagnosis results.
5. Diagnose CAN communication system. Refer to LAN-5, "CAN COMMUNICATION" . M
Precautions for CAN System UKS002ED
q Do not apply voltage of 7.0 V or higher to terminal to be measured.
q Maximum open terminal voltage of tester in use must be less than 7.0 V.
q Before checking harnesses, turn ignition switch OFF and disconnect negative battery terminal.
q Area to be repaired must be soldered and wrapped with tape.
Make sure that fraying of twisted wire is within 110 mm (4.33 in).
PKIA0306E
Revision: September 2004 LAN-3 2005 Quest
PRECAUTIONS
[CAN]
q Do not make a bypass connection to repaired area. (If the cir-
cuit is bypassed, characteristics of twisted wire will be lost.)
PKIA0307E
Revision: September 2004 LAN-4 2005 Quest
CAN COMMUNICATION
[CAN]
CAN COMMUNICATION PFP:23710
A
System Description UKS002EG
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- B
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. C
CAN Communication Unit UKS002EH
Refer to the following table to determine CAN system type. D
Axle 2WD
Engine VQ35DE
E
Transmission 4 A/T 5 A/T
Brake control TCS TCS VDC
Navigation system X X F
Automatic drive positioner X X
CAN system type 1 2 3 4 5
G
CAN system trouble diagnosis LAN-15 LAN-42 LAN-69 LAN-96 LAN-126
X: Applicable
NOTE: H
Confirming the presence of the following items helps to identify CAN system type.
q Models with TCS
I
J
LAN
BKIA0169E
L
q Models with VDC
M
BKIA0170E
Revision: September 2004 LAN-5 2005 Quest
CAN COMMUNICATION
[CAN]
q Models with navigation system
BKIA0146E
q Models with automatic drive positioner
BKIA0145E
Revision: September 2004 LAN-6 2005 Quest
CAN COMMUNICATION
[CAN]
TYPE 1
System diagram A
q Type 1
B
C
D
E
F
SKIB1738E
Input/output signal chart G
T: Transmit R: Receive
ABS
actuator H
and Combi-
Front air Display IPDM E/
Signals ECM TCM electric BCM nation
control unit R
unit meter
(control I
unit)
Engine speed signal T R R R R
J
Engine coolant temperature signal T R R
Ignition switch signal T R
Ignition power supply confirmation signal R T LAN
T R
Fuel consumption monitor signal
R T
A/C switch signal R R T L
A/C compressor request signal T R
Blower fan motor switch signal R T
M
R T
A/C switch/indicator signal
T R
Cooling fan speed request signal T R
Cooling fan speed signal R T
Position light request signal T R R
Low beam request signal T R
Low beam status signal R T
High beam request signal T R R
High beam status signal R T
Front fog light request signal T R
T R R
Vehicle speed signal
R R R T
Sleep wake up signal T R R
Revision: September 2004 LAN-7 2005 Quest
CAN COMMUNICATION
[CAN]
ABS
actuator
and Combi-
Front air Display IPDM E/
Signals ECM TCM electric BCM nation
control unit R
unit meter
(control
unit)
IPDM E/R wake up sleep request signal R T
IPDM E/R refuse to sleep signal R T
BCM wake up request signal R T
Door switch signal R T R R
Turn indicator signal T R
Cornering lamp request signal T R
Oil pressure switch signal R T
Buzzer output signal T R
Fuel level sensor signal R T
ASCD SET indicator signal T R
ASCD CRUISE indicator signal T R
Malfunction indicator lamp signal T R
Front wiper request signal T R
Front wiper stop position signal R T
Rear window defogger switch signal R R T R
Rear window defogger control signal R T
Horn chirp signal T R
ABS warning lamp signal T R
Brake warning lamp signal T R
T R
System setting signal
R T
Distance to empty signal R T
A/T self-diagnosis signal R T
T R
Engine and A/T integrated control signal
R T
Accelerator pedal position signal T R
Closed throttle position signal T R
Wide open throttle position signal T R
P range signal T R
Stop lamp switch signal R T
Input shaft revolution signal R T
Output shaft revolution signal R T
ASCD operation signal T R
ASCD OD cancel request signal T R
SLIP indicator lamp signal T R
O/D OFF indicator lamp signal T R
A/T position indicator lamp signal T R
A/T shift schedule change demand signal R T
Overdrive control switch signal R T
Tire pressure signal T R
Revision: September 2004 LAN-8 2005 Quest
CAN COMMUNICATION
[CAN]
ABS
actuator A
and Combi-
Front air Display IPDM E/
Signals ECM TCM electric BCM nation
control unit R
unit meter
(control B
unit)
Tire pressure data signal R T
Seat belt buckle switch signal R T
C
TYPE 2/TYPE 3
System diagram D
q Type 2
E
F
G
H
I
SKIB1738E
q Type 3 J
LAN
L
M
SKIB1739E
Revision: September 2004 LAN-9 2005 Quest
CAN COMMUNICATION
[CAN]
Input/output signal chart
T: Transmit R: Receive
ABS
actuator
and Display Combi-
Front air Display IPDM E/
Signals ECM TCM electric control BCM nation
control unit R
unit unit meter
(control
unit)
Engine speed signal T R R R R R R
Engine coolant temperature sig-
T R R R
nal
Ignition switch signal T R
Ignition power supply confirma-
R T
tion signal
ABS operation signal R T
T R
Fuel consumption monitor signal
R R T
A/C switch signal R R T
A/C compressor request signal T R
Blower fan motor switch signal R T
R T T
A/C switch/indicator signal
T R R
Cooling fan speed request signal T R
Cooling fan speed signal R T
Position light request signal T R R
Low beam request signal T R
Low beam status signal R T
High beam request signal T R R
High beam status signal R T
Front fog light request signal T R
T R R
Vehicle speed signal
R R R R R T
Sleep wake up signal T R R
IPDM E/R wake up sleep request
R T
signal
IPDM E/R refuse to sleep signal R T
BCM wake up request signal R T
Door switch signal R R T R R
Turn indicator signal T R
Cornering lamp request signal T R
Oil pressure switch signal R T
Buzzer output signal T R
Fuel level sensor signal R T
ASCD SET indicator signal T R
ASCD CRUISE indicator signal T R
Malfunction indicator lamp signal T R
Front wiper request signal T R
Front wiper stop position signal R T
Revision: September 2004 LAN-10 2005 Quest
CAN COMMUNICATION
[CAN]
ABS
actuator A
and Display Combi-
Front air Display IPDM E/
Signals ECM TCM electric control BCM nation
control unit R
unit unit meter
(control B
unit)
Rear window defogger switch sig-
R R R T R
nal C
Rear window defogger control
R T
signal
Horn chirp signal T R D
ABS warning lamp signal T R
Brake warning lamp signal T R
E
T T R
System setting signal
R R T
Distance to empty signal R R T F
A/T self-diagnosis signal R T
Engine and A/T integrated control T R
signal G
R T
Accelerator pedal position signal T R R
P range signal T R H
Stop lamp switch signal R T
TCS operation signal R T
Input shaft revolution signal R T I
Output shaft revolution signal R T
ASCD operation signal T R
J
ASCD OD cancel request signal T R
SLIP indicator lamp signal T R
O/D OFF indicator lamp signal T R LAN
A/T position indicator lamp signal T R
A/T shift schedule change
demand signal
R T L
Tire pressure signal T R
Tire pressure data signal R R T
M
Seat belt buckle switch signal R T
Revision: September 2004 LAN-11 2005 Quest
CAN COMMUNICATION
[CAN]
TYPE 4/TYPE 5
System diagram
q Type 4
SKIB1740E
q Type 5
SKIB1741E
Input/output signal chart
T: Transmit R: Receive
ABS
actua-
tor
Dis- Driver
and Com- Steer-
Front play Dis- seat
elec- bina- ing IPDM
Signals ECM TCM air con- play BCM con-
tric tion angle E/R
control trol unit trol
unit meter sensor
unit unit
(con-
trol
unit)
Engine speed signal T R R R R R R
Engine coolant temperature sig-
T R R R
nal
Key switch signal T R
Ignition switch signal T R R
Ignition power supply confirma-
R T
tion signal
Revision: September 2004 LAN-12 2005 Quest
CAN COMMUNICATION
[CAN]
ABS
actua- A
tor
Dis- Driver
and Com- Steer-
Front play Dis- seat
elec- bina- ing IPDM
Signals ECM TCM air con- play BCM con- B
tric tion angle E/R
control trol unit trol
unit meter sensor
unit unit
(con-
trol
unit)
C
ABS operation signal R T
T R D
Fuel consumption monitor signal
R R T
A/C switch signal R R T
A/C compressor request signal T R E
Blower fan motor switch signal R T
R T T
A/C switch/indicator signal F
T R R
Cooling fan speed request signal T R
Cooling fan speed signal R T G
Position light request signal T R R
Low beam request signal T R
H
Low beam status signal R T
High beam request signal T R R
High beam status signal R T I
Front fog light request signal T R
T R R
Vehicle speed signal J
R R R R R T R
Sleep wake up signal T R R
IPDM E/R wake up sleep request LAN
R T
signal
IPDM E/R refuse to sleep signal R T
BCM wake up request signal R T L
Door switch signal R R T R R R
Turn indicator signal T R
M
Cornering lamp request signal T R
Key fob ID signal T R
Key fob door unlock signal T R
Oil pressure switch signal R T
Buzzer output signal T R
Fuel level sensor signal R T
ASCD SET indicator signal T R
ASCD CRUISE indicator signal T R
Malfunction indicator lamp signal T R
Front wiper request signal T R
Front wiper stop position signal R T
Rear window defogger switch sig-
R R R T R
nal
Revision: September 2004 LAN-13 2005 Quest
CAN COMMUNICATION
[CAN]
ABS
actua-
tor
Dis- Driver
and Com- Steer-
Front play Dis- seat
elec- bina- ing IPDM
Signals ECM TCM air con- play BCM con-
tric tion angle E/R
control trol unit trol
unit meter sensor
unit unit
(con-
trol
unit)
Rear window defogger control
R T
signal
Horn chirp signal T R
ABS warning lamp signal T R
Brake warning lamp signal T R
T T R R
System setting signal
R R T T
Distance to empty signal R R T
A/T self-diagnosis signal R T
Engine and A/T integrated control T R
signal R T
Accelerator pedal position signal T R R
P range signal T R R
R range signal T R
Stop lamp switch signal R T
VDC operation signal R T
Input shaft revolution signal R T
Output shaft revolution signal R T
ASCD operation signal T R
ASCD OD cancel request signal T R
Steering angle sensor signal R T
SLIP indicator lamp signal T R
O/D OFF indicator lamp signal T R
A/T position indicator lamp signal T R
A/T shift schedule change
R T
demand signal
Tire pressure signal T R
Tire pressure data signal R R T
Seat belt buckle switch signal R T
Revision: September 2004 LAN-14 2005 Quest
CAN SYSTEM (TYPE 1)
[CAN]
CAN SYSTEM (TYPE 1) PFP:23710
A
System Description UKS002EI
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- B
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. C
Component Parts and Harness Connector Location UKS002EJ
D
E
F
G
H
I
WKIA1097E
J
LAN
L
M
Revision: September 2004 LAN-15 2005 Quest
CAN SYSTEM (TYPE 1)
[CAN]
Schematic UKS002EK
WKWA0599E
Revision: September 2004 LAN-16 2005 Quest
CAN SYSTEM (TYPE 1)
[CAN]
Wiring Diagram -- CAN -- UKS002EL
A
B
C
D
E
F
G
H
I
J
LAN
L
M
BKWA0332E
Revision: September 2004 LAN-17 2005 Quest
CAN SYSTEM (TYPE 1)
[CAN]
BKWA0333E
Revision: September 2004 LAN-18 2005 Quest
CAN SYSTEM (TYPE 1)
[CAN]
A
B
C
D
E
F
G
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