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Infiniti QX4. Electrical System (2003 year). Manual - part 24

SKIA1255E

BOOSTER SOLENOID

NBEL0470S04

Disconnect booster solenoid/release switch connector, and check
resistance value between terminals 4 and 6.

4 - 6: Approx. 1.4

Ω

SKIA1256E

RELEASE SWITCH

NBEL0470S05

Disconnect booster solenoid/release switch connector and check
resistance between the terminals.

Condition

1 - 3

1 - 2

2 - 3

Release the brake pedal.

Continuity

should exist.

Continuity

should not

exist.

Continuity

should not

exist.

Depress the brake pedal.

Continuity

should not

exist. (Note)

Continuity

should exist.

(Note)

Continuity

should not

exist.

(Note): However, if pedal is depressed insufficiently, resistance value may remain
unchanged.

ASCD ACTUATOR

NBEL0470S06

Disconnect vacuum hose from ASCD actuator.

PBIC0218E

Connect the hose of hand vacuum pump to ASCD actuator.
Apply –40 kPa (–0.41 kg/cm

, –5.8 psi) vacuum to ASCD

actuator with hand vacuum pump.
ASCD wire should move to pull throttle drum.
Wait 10 seconds and check for decrease in vacuum pres-
sure.

Vacuum pressure decrease:

Less than 2.7 kPa (0.028 kg/cm

, 0.39 psi)

MEL402G

VACUUM HOSE

NBEL0470S07

Check vacuum hose (between ASCD actuator and ASCD pump)
for breakage, cracks or fracture.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Electrical Component Inspection (Cont’d)

EL-373

ASCD PUMP

NBEL0470S08

Disconnect vacuum hose from ASCD pump and ASCD pump
harness connector.

If necessary remove ASCD pump.

Connect vacuum gauge to ASCD pump.

PBIC0219E

Apply 12V direct current to ASCD pump and check operation.

12V direct current supply terminals

Operation

(+)

(–)

Air valve

Release valve

Vacuum motor

Operate

A vacuum pressure of at least −40 kPa (−0.41 kg/cm

, −5.8

psi) should be generated.

Removal And Installation

NBEL0471

ICC UNIT

NBEL0471S01

SEL538Y

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Electrical Component Inspection (Cont’d)

EL-374

ICC SENSOR

NBEL0471S02

SEL539Y

ICC WARNING CHIME

NBEL0471S03

SEL540Y

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Removal And Installation (Cont’d)

EL-375

ICC STEERING SWITCH

NBEL0471S04

SKIA1253E

ASCD WIRE ADJUSTMENT

NBEL0471S05

MEL383K

CAUTION:

쐌

Be careful not to twist ASCD wire when removing it.

쐌

Do not tense ASCD wire excessively during adjustment.

Adjust the tension of ASCD wire in the following manner.
1.

Loosen lock nut and adjusting nut.

Make sure that accelerator wire is properly adjusted. Refer to
FE-3, “ACCELERATOR CONTROL SYSTEM”.

Tighten adjusting nut just until throttle drum starts to move.

Loosen adjusting nut again 1/2 to 1 turn.

Tighten lock nut.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Removal And Installation (Cont’d)

EL-376

System Description

NBEL0378

Power is supplied at all times

쐌

from 40A fusible link (letter f, located in the fuse and fusible link box)

쐌

to circuit breaker terminal 1

쐌

through circuit breaker terminal 2

쐌

to power window relay terminal 3,

쐌

to power window main switch terminal 19, and

쐌

to front power window switch RH terminal 10.

With ignition switch in ON or START position, power is supplied

쐌

through 7.5A fuse [No. 11, located in the fuse block (J/B)]

쐌

to smart entrance control unit terminal 27

쐌

to smart entrance control unit terminal 46 and

쐌

to power window relay terminal 2.

Ground is supplied to power window relay terminal 1

쐌

through body grounds M4, M66 and M147.

The power window relay is energized and power is supplied

쐌

through power window relay terminal 5

쐌

to power window main switch terminal 10,

쐌

to rear power window switch LH and RH terminals 1.

MANUAL OPERATION

NBEL0378S01

Front Door LH

NBEL0378S0101

Ground is supplied

쐌

to power window main switch terminal 17

쐌

through body grounds M77 and M111.

WINDOW UP
When the front LH switch in the power window main switch is pressed in the up position, power is supplied

쐌

to front power window regulator LH terminal 1

쐌

through power window main switch terminal 8.

Ground is supplied

쐌

to front power window regulator LH terminal 3

쐌

through power window main switch terminal 11.

Then, the motor raises the window until the switch is released.
WINDOW DOWN
When the LH switch in the power window main switch is pressed in the down position, power is supplied

쐌

to front power window regulator LH terminal 3

쐌

through power window main switch terminal 11.

Ground is supplied

쐌

to front power window regulator LH terminal 1

쐌

through power window main switch terminal 8.

Then, the motor lowers the window until the switch is released.

Front Door RH

NBEL0378S0102

Ground is supplied

쐌

to power window main switch terminal 17

쐌

through body grounds M77 and M111.

NOTE:
Numbers in parentheses are terminal numbers, when power window switch is pressed in the UP and DOWN
positions respectively.
POWER WINDOW MAIN SWITCH OPERATION
When front RH switch in the power window main switch is pressed UP or DOWN, power window main switch
sends window up or down signal to front power window switch RH with power window serial link communica-
tion line. Refer to “POWER WINDOW SERIAL LINK” (EL-379). Signals are supplied

IDX

POWER WINDOW

System Description

EL-377

쐌

through power window main switch terminal 14

쐌

to front power window switch RH terminal 16.

The subsequent operation is the same as the front power window switch RH operation.
FRONT POWER WINDOW SWITCH RH OPERATION
Power is supplied

쐌

through front power window switch RH terminal (8, 9)

쐌

to front power window regulator RH terminal (1, 3).

Ground is supplied

쐌

to front power window regulator RH terminal (3, 1)

쐌

through front power window switch RH terminal (9, 8)

쐌

to front power window switch RH terminal 16

쐌

through power window main switch terminal 14.

Then, the motor raises or lowers the window until the switch is released.

Rear Door LH

NBEL0378S0103

Ground is supplied

쐌

to power window main switch terminal 17

쐌

through body grounds the M77 and M111.

NOTE:
Numbers in parentheses are terminal numbers, when the power window switch is pressed in the UP and
DOWN positions.
POWER WINDOW MAIN SWITCH OPERATION
Power is supplied

쐌

through power window main switch terminal (1, 3)

쐌

to rear power window switch LH terminal (2, 3)

The subsequent operation is the same as the rear power window switch LH operation.
REAR POWER WINDOW SWITCH LH
Power is supplied

쐌

through rear power window switch LH terminal (5, 4)

쐌

to rear power window regulator LH terminal (1, 2)

Ground is supplied

쐌

to rear power window regulator LH terminal (2, 1)

쐌

through rear power window switch LH terminal (4, 5)

쐌

to rear power window switch LH terminal (3, 2)

쐌

through power window main switch terminal (3, 1)

Then, the motor raises or lowers the window until the switch is released.

Rear Door RH

NBEL0378S0104

Rear door RH windows will rise and lower in the same manner as the rear door LH window.

AUTO OPERATION

NBEL0378S02

The power window AUTO feature enables the driver or front passenger to open or close the driver’s and front
passenger’s window without holding the window switch in the up or down position.
The AUTO feature only operates on the driver’s and front passenger’s window upward and downward move-
ment.

POWER WINDOW LOCK

NBEL0378S03

The power window lock is designed to lock operation of all windows except for driver’s door window.
When the lock switch is pressed to lock position, the ground of the front and rear power window switches, in
the power window main switch, is disconnected. This prevents the power window motors from operating.

RETAINED POWER OPERATION

NBEL0378S04

When the ignition switch is turned to OFF position from ON or START position, power is supplied for 45 sec-
onds

쐌

to power window relay terminal 2

쐌

from smart entrance control unit terminal 46.

POWER WINDOW

System Description (Cont’d)

EL-378

Ground is always supplied

쐌

to power window relay terminal 1

쐌

through body grounds M4, M66 and M147.

When power and ground are supplied, the power window relay continues to be energized, and the power win-
dow can be operated.
The retained power operation is canceled when the driver or passenger side door is opened.
RAP signal’s period can be changed by CONSULT-II. (EL-387)

INTERRUPTION DETECTION FUNCTION

NBEL0378S05

Power window main switch and front power window switch RH monitor the power window regulator motor
operation and the power window position (full closed or other) for driver’s and passenger’s power window by
the signals from encoder and limit switch in front power window regulator LH or RH.
When power window main switch or front power window switch RH detects interruption during the following
close operation in the driver’s or front passenger’s side door,

쐌

automatic close operation when ignition switch is in the “ON” position

쐌

automatic close operation during retained power operation

Power window main switch or front power window switch RH controls driver’s or front passenger’s power win-
dow regulator motor for open and the power window will be lowered about 150 mm (5.91 in).

POWER WINDOW OPENED/CLOSED OPERATION WITH KEY CYLINDER

NBEL0378S06

When ignition key switch is OFF, front power window can be opened or closed by turning the front door key
cylinder LH to UNLOCK/LOCK position.

쐌

Power window can be opened as the door key cylinder is kept fully turning to the UNLOCK position.

쐌

Power window can be closed as the door key cylinder is kept fully turning to the LOCK position.

The power window opening stops when the following operations are carried out:

쐌

While performing open/close the window, power window is stopped at the position as the door key cylin-
der is placed on Neutral.

쐌

When the ignition switch is turned ON while the power window opening is operated.

POWER WINDOW SERIAL LINK

NBEL0378S07

Power window main switch, front power window switch RH and smart entrance control unit transmit and
receive the signal by power window serial link.
The under-mentioned signal is transmitted from smart entrance control unit to power window main switch or
front power window switch RH.

쐌

Door lock or unlock signal (remote keyless entry system)

쐌

Power window down signal (remote keyless entry system)

The under-mentioned signal is transmitted from power window main switch to front power window switch RH.

쐌

Door lock or unlock signal (remote keyless entry system)

쐌

Power window open/closed operation signal by key cylinder

쐌

Power window lock signal

IDX

POWER WINDOW

System Description (Cont’d)

EL-379

Schematic

NBEL0379

MEL344Q

POWER WINDOW

Schematic

EL-380

Wiring Diagram — WINDOW —

NBEL0380

MEL402R

IDX

POWER WINDOW

Wiring Diagram — WINDOW —

EL-381

MEL346Q

POWER WINDOW

Wiring Diagram — WINDOW — (Cont’d)

EL-382

MEL347Q

IDX

POWER WINDOW

Wiring Diagram — WINDOW — (Cont’d)

EL-383

MEL348Q

POWER WINDOW

Wiring Diagram — WINDOW — (Cont’d)

EL-384

MEL349Q

IDX

POWER WINDOW

Wiring Diagram — WINDOW — (Cont’d)

EL-385

SEL670Y

CONSULT-II Inspection Procedure

NBEL0381

“RETAINED PWR”

NBEL0381S01

Turn ignition switch “OFF”.

Connect “CONSULT-II” and “CONSULT-II CONVERTER” to
the data link connector.

SKIA3098E

Turn ignition switch “ON”.

Touch “START (NISSAN BASED VHCL)”.

SEL398Y

Touch “SMART ENTRANCE”.
If “SMART ENTRANCE” is not indicated, go to GI-42, “CON-
SULT-II Data Link Connector (DLC) Circuit”.

SEL751Y

Touch “RETAINED PWR”.

SEL400Y

Select diagnosis mode.
“DATA MONITOR”, “ACTIVE TEST” and “WORK SUPPORT”
are available.

POWER WINDOW

CONSULT-II Inspection Procedure

EL-386

CONSULT-II Application Items

NBEL0382

“RETAINED PWR”

NBEL0382S01

Data Monitor

NBEL0382S0101

Monitored Item

Description

IGN ON SW

Indicates [ON/OFF] condition of ignition switch.

DOOR SW-DR

Indicates [ON/OFF] condition of front door switch LH.

DOOR SW-AS

Indicates [ON/OFF] condition of front door switch RH.

Active Test

NBEL0382S0102

Test Item

Description

RETAINED PWR

This test is able to supply RAP signal (power) from smart entrance control unit to power window
system, power sunroof system and headlamp battery saver control unit. Those systems can be
operated when turning on “RETAINED PWR” on CONSULT-II screen even if the ignition switch is
tuned OFF.
NOTE:
During this test, CONSULT-II can be operated with ignition switch in “OFF” position.
“RETAINED PWR” should be turned “ON” or “OFF” on CONSULT-II screen when ignition
switch is ON. Then turn ignition switch OFF to check retained power operation. CON-
SULT-II might be stuck if “RETAINED PWR” is turned “ON” or “OFF” on CONSULT-II screen
when ignition switch is OFF.

Work Support

NBEL0382S0103

Work Item

Description

RETAINED PWR SET

Rap signal’s power supply period can be changed by mode setting. Selects rap signal’s power
supply period between three steps.

쐌

MODE 1 (45 sec.)/MODE 2 (OFF)/MODE 3 (2 min.)

Trouble Diagnoses

NBEL0490

Symptom

Possible cause

Repair order

None of the power windows can be
operated using any switch.

1. 7.5A fuse, 40A fusible link
2. M145 circuit breaker
3. Power window relay
4. M145 circuit breaker circuit
5. Power window relay circuit
6. Ground circuit
7. Power window main switch

1. Check 7.5A fuse [No. 11, located in fuse block

(J/B)], 40A fusible link (letter f, located in fuse and
fusible link box).

2. Check M145 circuit breaker.
3. Check power window relay.
4. Check the following.
a. Harness between M145 circuit breaker and 40A

fusible link

b. Harness between M145 circuit breaker and power

window main switch

5. Check the following.
a. Harness between 7.5A fuse and power window

relay

b. Harness between M145 circuit breaker and power

window relay

6. Check the following.
a. Ground circuit of power window main switch termi-

nal 17

b. Power window relay ground circuit
7. Check power window main switch.

IDX

POWER WINDOW

CONSULT-II Application Items

EL-387

Symptom

Possible cause

Repair order

Driver side power window cannot
be operated but other windows can
be operated.

1. Front power window regulator

LH circuit

2. Front power window regulator

3. Power window main switch

1. Check harness between power window main switch

and front power window regulator LH for open or
short circuit.

2. Check front power window regulator LH.
3. Check power window main switch.

Passenger side power window can-
not be operated but other window
can be operated.

1. Power supply for front power

window switch RH

2. Front power window switch RH

ground circuit

3. Front power window switch RH

circuit

4. Front power window regulator

RH circuit

5. Front power window regulator

6. Power window main switch
7. Front power window switch RH

1. Check power supply for front power window switch

RH terminal 10.

2. Check front power window switch RH ground cir-

cuit.

3. Check harness between front power window switch

RH and power window main switch.

4. Check harness between front power window switch

RH and front power window regulator RH for open
or short circuit.

5. Check front power window regulator RH.
6. Check power window main switch.
7. Check front power window switch RH.

One or more rear power windows
except front window cannot be
operated.

1. Rear power window switches
2. Rear power window regulators
3. Power window main switch
4. Rear power window circuit

1. Check rear power window switches.
2. Check rear power window regulator.
3. Check power window main switch.
4. Check the following.
a. Harness between the rear power window switches

(LH and RH) terminal 1 and power window relay
terminal 5

b. Harnesses between power window main switch and

rear power window switches for open/short circuit

c. Harnesses between rear power window switches

and rear power window regulator for open/short cir-
cuit

Power windows except driver’s side
window cannot be operated using
power window main switch but can
be operated by power window
switches.

1. Power window main switch

1. Check power window main switch.

Driver side power window auto-
matic operation does not function
properly.

1. Power window main switch
2. Encoder and limit switch

1. Check power window main switch.
2. Check encoder and limit switch. (EL-390)

Front passenger side power win-
dow automatic operation does not
function properly.

1. Front power window switch RH
2. Encoder and limit switch

1. Check front power window switch RH.
2. Check encoder and limit switch. (EL-390)

POWER WINDOW

Trouble Diagnoses (Cont’d)

EL-388

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