Nissan GT-R. Manual - part 190

LAN-8

< PRECAUTION >

[CAN]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

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The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
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
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 AIR BAG” and “SEAT BELT” of this
Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precaution for Battery Service

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Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.

Precaution for Working Range at a Regular Dealership

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CAUTION:

The service items unmentioned on this manual are recommended to be performed by a GT-R certified
NISSAN dealer. Because those service items require special equipment and a GT-R certified technical
staff who completed special training.

Precautions for Trouble Diagnosis

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CAUTION:

• Never apply 7.0 V or more to the measurement terminal.
• Use a tester with open terminal voltage of 7.0 V or less.
• Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when

checking the harness. 

LAN

PRECAUTIONS

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Precautions for Harness Repair

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• Solder the repaired area and wrap tape around the soldered area.

NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).

• Bypass connection is never allowed at the repaired area.

NOTE:
Bypass connection may cause CAN communication error. The
spliced wire becomes separated and the characteristics of twisted
line are lost. 

• Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communica-

tion line.

SKIB8766E

SKIB8767E

LAN-10

< BASIC INSPECTION >

[CAN]

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Interview Sheet

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SKIB8898E

LAN

CAN COMMUNICATION SYSTEM

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< SYSTEM DESCRIPTION >

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SYSTEM DESCRIPTION

CAN COMMUNICATION SYSTEM

CAN System Specification Chart

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Determine CAN system type from the following specification chart.

CAN Communication Signal Chart

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Refer to 

LAN-6, "How to Use CAN Communication Signal Chart"

 for how to use CAN communication signal

chart.
NOTE:
Refer to 

LAN-7, "Abbreviation List"

 for the abbreviations of the connecting units.

T: Transmit

R: Receive

Body type

Coupe

Axle

AWD

Engine

VR38DETT

Transmission

Dual clutch transmission

Brake control

VDC

CAN system type

1

Signal name/Connecting unit

EC

M

4WD

BC

M

E-SUS

AV

HV

AC

M&A

ST

RG

TP

MS

TCM

ABS

IP

DM

-E

A/C compressor feedback signal

T

R

A/C compressor request signal

T

R

Accelerator pedal position signal

T

R

R

R

R

ASCD status signal

T

R

R

Cooling fan speed request signal

T

R

Engine and transmission integrated con-
trol signal

T

R

R

T

Engine coolant temperature signal

T

R

R

R

T

Engine estimated torque signal

T

R

Engine speed signal

T

R

R

R

R

R

Engine status signal

T

R

R

R

Fuel consumption monitor signal

T

R

R

T

Malfunctioning indicator lamp signal

T

R

Power generation command value signal

T

R

AWD clutch high temperature warning dis-
play signal

T

R

AWD signal

T

R

AWD system warning display signal

T

R

AWD warning lamp signal

T

R

Front/rear tire size discrepancy warning 
display signal

T

R

Front torque distribution rate signal

T

R

R

T