Infiniti QX4 (R50). Manual — part 442
manual.
Fuse block — Junction box (J/B)
Fuse block — Junction box (J/B) connector number is shown in the
Reference Area of the wiring diagram. For connector terminal and
fuse arrangement, refer to the “FUSE BLOCK — Junction Box
(J/B)” electrical reference page at the end of the manual.
Fuse and fusible link box
For fuse arrangement in the fuse and fusible link box, refer to the
“FUSE AND FUSIBLE LINK BOX” electrical reference page at the
end of the manual.
Electrical units
Electrical unit connector symbols are shown in the Connector Area
of the wiring diagram.
However, when there is not enough space to show the connector
terminal arrangement in the Connector Area of the wiring diagram,
the electrical unit connector number is shown in the Reference
Area of the wiring diagram. For electrical unit connector terminal
arrangement, refer to the “ELECTRICAL UNITS” electrical refer-
ence page at the end of the manual. Most of the electrical unit
connectors on this page are shown from the harness side of the
connector.
Joint connector
Joint connector symbols are shown in the connector area of the
wiring diagram. For connector internal wiring layout and joint con-
nector terminal arrangement, refer to the “JOINT CONNECTOR
(J/C)” electrical reference page at the end of the manual.
HOW TO READ WIRING DIAGRAMS
Description (Cont’d)
GI-20
NBGI0011
Connector and Terminal Pin Kit
NBGI0011S01
Use the connector and terminal pin kit listed below when replacing
connectors or terminals.
The connector and terminal pin kit contains some of the most
commonly used INFINITI connectors and terminals.
Tool number
(Kent-Moore No.)
Tool name
Description
—
(J38751-95INF)
Connector and terminal
pin kit
—
(J42992-98KIT)
OBD Terminal Repair Kit
SGI109A
How to Probe Connectors
NBGI0011S02
Connector damage and an intermittent connection can result from
improperly probing of the connector during circuit checks.
The probe of a digital multimeter (DMM) may not correctly fit the
connector cavity. To correctly probe the connector, follow the pro-
cedures below using a “T” pin. For the best contact grasp the “T”
pin using an alligator clip.
SGI841
PROBING FROM HARNESS SIDE
NBGI0011S0201
Standard type (not waterproof type) connector should be probed
from harness side with “T” pin.
I
If the connector has a rear cover such as a ECM
connector, remove the rear cover before probing the ter-
minal.
I
Do not probe waterproof connector from harness side.
Damage to the seal between wire and connector may
result.
SEL265V
PROBING FROM TERMINAL SIDE
NBGI0011S0202
Female Terminal
I
There is a small notch above each female terminal. Probe
each terminal with the “T” pin through the notch.
Do not insert any object other than the same type male
terminal into female terminal.
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
HOW TO CHECK TERMINAL
Connector and Terminal Pin Kit
GI-21
SEL266V
I
Some connectors do not have a notch above each terminal. To
probe each terminal, remove the connector retainer to make
contact space for probing.
SEL267V
Male Terminal
Carefully probe the contact surface of each terminal using a “T” pin.
Do not bend terminal.
How to Check Enlarged Contact Spring of
Terminal
NBGI0011S03
An enlarged contact spring of a terminal may create intermittent
signals in the circuit.
If the intermittent open circuit occurs, follow the procedure below
to inspect for open wires and enlarged contact spring of female
terminal.
SEL270V
1.
Assemble a male terminal and approx. 10 cm (3.9 in) of wire.
Use a male terminal which matches the female terminal.
2.
Disconnect the suspected faulty connector and hold it terminal
side up.
SEL271V
3.
While holding the wire of the male terminal, try to insert the
male terminal into the female terminal.
Do not force the male terminal into the female terminal
with your hands.
HOW TO CHECK TERMINAL
How to Probe Connectors (Cont’d)
GI-22
SEL272V
4.
While moving the connector, check whether the male terminal
can be easily inserted or not.
SEL273V
I
If the male terminal can be easily inserted into the female
terminal, replace the female terminal.
SEL275V
Waterproof Connector Inspection
NBGI0011S04
If water enters the connector, it can short interior circuits. This may
lead to intermittent problems.
Check the following items to maintain the original waterproof char-
acteristics.
RUBBER SEAL INSPECTION
NBGI0011S0401
I
Most waterproof connectors are provided with a rubber seal
between the male and female connectors. If the seal is
missing, the waterproof performance may not meet specifica-
tions.
I
The rubber seal may come off when connectors are discon-
nected. Whenever connectors are reconnected, make sure the
rubber seal is properly installed on either side of male or
female connector.
WIRE SEAL INSPECTION
NBGI0011S0402
The wire seal must be installed on the wire insertion area of a
waterproof connector. Be sure that the seal is installed properly.
SEL330V
Terminal Lock Inspection
NBGI0011S05
Check for unlocked terminals by pulling wire at the end of connec-
tor. An unlocked terminal may create intermittent signals in the
circuit.
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
HOW TO CHECK TERMINAL
How to Check Enlarged Contact Spring of Terminal (Cont’d)
GI-23
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