Construction...............................................................19
Removal and Installation ...........................................19
Pinion/Clutch Check ..................................................20

CHARGING SYSTEM ....................................................21

System Description....................................................21
Wiring Diagram - CHARGE -.....................................22
Trouble Diagnoses with Battery/Starting/Charging
System Tester ............................................................23

DIAGNOSTIC RESULT ITEM CHART

........................25

WORK FLOW

..........................................................26

DIAGNOSTIC PROCEDURE 1

..................................27

DIAGNOSTIC PROCEDURE 2

..................................28

DIAGNOSTIC PROCEDURE 3

..................................29

MALFUNCTION INDICATOR

....................................29

Construction...............................................................30
Removal and Installation ...........................................30

SERVICE DATA AND SPECIFICATIONS (SDS) .........31

Battery........................................................................31
Starter ........................................................................31
Alternator ...................................................................31

IDX

Supplemental Restraint System (SRS) “AIR
BAG” and “SEAT BELT PRE-TENSIONER”

NCSC0001

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER” used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to INFINITI G20 is as follows:

For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), seat belt
pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable.

For a side collision
The Supplemental Restraint System consists of side air bag module (located in the outer side of front seat),
satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision), wiring harness,
warning lamp (one of components of air bags for a frontal collision).

Information necessary to service the system safely is included in the RS section of this Service Manual.

WARNING:

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 performed
by an authorized INFINITI dealer.

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 RS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses (except “SEAT BELT PRE-TENSIONER” connector) can be
identified by yellow harness connector.

Wiring Diagrams and Trouble Diagnosis

NCSC0002

When you read wiring diagrams, refer to the following:

GI-11, “HOW TO READ WIRING DIAGRAMS”

EL-9, “POWER SUPPLY ROUTING” for power distribution circuit

When you perform trouble diagnosis, refer to the following:

GI-35, “HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES”

GI-24, “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”

PRECAUTIONS

Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER”

SC-2

Special Service Tool

NCSC0017

Tool number
Tool name

Description

J-44373 Model 620
Battery/Starting/Charging
system tester

SEL403X

IDX

PREPARATION

Special Service Tool

SC-3

How to Handle Battery

NCSC0003

CAUTION:

If it becomes necessary to start the engine with a booster
battery and jumper cables, use a 12-volt booster battery.

After connecting battery cables, ensure that they are
tightly clamped to battery terminals for good contact.

Never add distilled water through the hole used to check
specific gravity.

MEL040F

METHODS OF PREVENTING OVER-DISCHARGE

NCSC0003S01

The following precautions must be taken to prevent over-discharg-
ing a battery.

The battery surface (particularly its top) should always be kept
clean and dry.

The terminal connections should be clean and tight.

At every routine maintenance, check the electrolyte level.
This also applies to batteries designated as “low maintenance”
and “maintenance-free”.

MEL041F

When the vehicle is not going to be used over a long period of
time, disconnect the negative battery terminal. (If the vehicle
has an extended storage switch, turn it off.)

MEL042F

Check the charge condition of the battery.
Periodically check the specific gravity of the electrolyte. Keep
a close check on charge condition to prevent over-discharge.

CHECKING ELECTROLYTE LEVEL

NCSC0003S02

WARNING:

Do not allow battery fluid to come in contact with skin, eyes,
fabrics, or painted surfaces. After touching a battery, do not
touch or rub your eyes until you have thoroughly washed your
hands. If acid contacts eyes, skin or clothing, immediately
flush with water for 15 minutes and seek medical attention.

BATTERY

How to Handle Battery

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