Ac system INFINITI QX4 2001 Factory Service Manual

System DescriptionNBEL0057WIPER OPERATIONNBEL0057S01The front wiper switch is controlled by a lever built into the combination switch.
There are three wiper switch positions:
ILO speed
IHI speed
IINT (Intermittent)
With the ignition switch in the ACC or ON position, power is supplied
Ithrough 20A fuse [No. 19, located in the fuse block (J/B)]
Ito front wiper motor terminal 4, and
Ito front wiper switch terminal 15.
Low and High Speed Wiper OperationNBEL0057S0101Ground is supplied to front wiper switch terminal 17 through body grounds E13 and E41.
When the wiper switch is placed in the LO position, ground is supplied
Ithrough terminal 14 of the front wiper switch
Ito front wiper motor terminal 3.
With power and ground supplied, the front wiper motor operates at low speed.
When the front wiper switch is placed in the HI position, ground is supplied
Ithrough terminal 16 of the front wiper switch
Ito front wiper motor terminal 1.
With power and ground supplied, the front wiper motor operates at high speed.
Auto Stop OperationNBEL0057S0102With front wiper switch turned OFF, front wiper motor will continue to operate until wiper arms reach windshield
base.
When wiper arms are not located at base of windshield with front wiper switch OFF, ground is provided
Ifrom terminal 14 of the front wiper switch
Ito front wiper motor terminal 3, in order to continue front wiper motor operation at low speed.
Ground is also supplied
Ito terminal 13 of the front wiper switch
Ithrough front wiper motor terminal 2
Ithrough terminal 6 of the front wiper motor, and
Ithrough body grounds M77 and M111.
When wiper arms reach base of windshield, front wiper motor terminals 2 and 4 are connected instead of ter-
minals 2 and 6. Wiper motor will then stop wiper arms at the PARK position.
Intermittent OperationNBEL0057S0103The front wiper motor operates the wiper arms one time at low speed at a set interval of approximately 2 to
13 seconds. This feature is controlled by the wiper amplifier built in the front wiper switch.
When the front wiper switch is placed in the INT position, ground is supplied
Ito wiper amplifier (INT SW)
Ifrom wiper switch terminal 17
Ithrough body grounds E13 and E41, and
Ito wiper motor terminal 3
Ithrough the wiper switch terminal 14
Ithrough wiper amplifier (OUTPUT)
WASHER OPERATIONNBEL0057S02With the ignition switch in the ACC or ON position, power is supplied
Ithrough 20A fuse [No. 19, located in the fuse block (J/B)]
Ito washer motor terminal 1.
When the lever is pulled to the WASH position, ground is supplied
Ito washer motor terminal 2
Ithrough terminal 18 of the wiper switch
FRONT WIPER AND WASHER
System Description
EL-136

Ithrough terminal 17 of the wiper switch, and
Ithrough body grounds E13 and E41.
With power and ground supplied, the washer motor operates.
When the lever is pulled to the WASH position for one second or more, the wiper motor operates at low speed
for approximately 3 seconds to clean windshield. This feature is controlled by the wiper amplifier in the same
manner as the intermittent operation.
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FRONT WIPER AND WASHER
System Description (Cont'd)
EL-137

System DescriptionNBEL0063WIPER OPERATIONNBEL0063S01Power Supply and GroundNBEL0063S0101With ignition switch in the ACC or ON position, power is supplied
Ithrough 10A fuse [No. 29, located in the fuse block (J/B)]
Ito rear wiper amp. terminal 6.
When the glass hatch switch is OPEN, ground is supplied
Ito rear wiper amp. terminal 3
Ithrough glass hatch switch terminal 1 and 2
Ithrough body grounds B11, B22 and D210.
Ground is supplied
Ito rear wiper amp. terminal 9
Ithrough body grounds B11, B22 and D210.
Low Speed Wiper OperationNBEL0063S0103When the rear wiper switch is turned ON, ground is supplied
Ito rear wiper amp. terminal 2
Ithrough combination switch terminals 22 and 24.
Ithrough body grounds E13 and E41
Then, power is supplied
Ithrough rear wiper amp. terminal 11
Ito rear wiper motor terminal 4.
Ground is supplied
Ito rear wiper motor terminal 3
Ithrough rear wiper amp. terminal 8.
With power and ground supplied, the wiper motor operates at low speed.
Auto Stop OperationNBEL0063S0104With rear wiper switch turned OFF, rear wiper motor will continue to operate until wiper arm reaches rear wiper
stopper.
When rear wiper arm is not located at rear wiper stopper with wiper switch OFF, ground is supplied
Ito rear wiper amp. terminal 10
Ithrough wiper motor terminals 7 and 8
Ithrough body grounds B11, B22 and D210.
Then rear wiper motor continues to operate until wiper arm reaches bottom.
When wiper arm reaches bottom, power is supplied
Ithrough 10A fuse [No. 29, located in the fuse block (J/B)]
Ithrough rear wiper motor terminals 6 and 7 and
Ithrough rear wiper amp. terminals 10 and 8
Ito rear wiper motor terminal 3.
Ground is supplied
Ito rear wiper motor 4
Ithrough rear wiper amp. terminal 11.
Then wiper motor turns the other way and wiper arm moves once until wiper arm reaches stopper.
Intermittent OperationNBEL0063S0105The rear wiper motor operates the wiper arms at low speed approximately every 7 seconds. This feature is
controlled by the wiper amp.
When the wiper switch is placed in the INT position, ground is supplied
Ito wiper amp. terminal 4
Ithrough rear combination switch terminal 21 and 24
Ithrough body grounds E13 and E41.
Then, power is supplied
Ithrough rear wiper amp. terminal 11
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REAR WIPER AND WASHER
System Description
EL-141

Ito rear wiper motor terminal 4.
Ground is supplied
Ito rear wiper motor terminal 3
Ithrough rear wiper amp. terminal 8.
With power and ground supplied, rear wiper operates at low speed intermittent.
WIPER OPERATION PROHIBIT CONTROLNBEL0063S03When glass hatch is open with back door key cylinder while rear wiper is operated, wiper operation is stopped.
(Wiper operation prohibit control)
When glass hatch is closed and rear wiper switch turns from OFF and then rear wiper switch is turned to ON,
wiper operation prohibit control is canceled.
WASHER OPERATIONNBEL0063S02When the rear wiper switch is turned to WASH position, ground is supplied
Ito rear wiper amp. terminal 1
Ithrough terminals 23 and 24
Ithrough body grounds E13 and E41.
Then, power is supplied
Ithrough rear wiper amp. terminal 7
Ito rear washer motor terminal 2.
Ground is supplied
Ito rear washer motor terminal 1
Ithrough body grounds E13 and E41.
With power and ground supplied, the rear washer motor operates.
When the rear wiper switch is turned to WASH position for one second or more, the rear wiper motor oper-
ates at low speed for approximately 3 seconds after the rear wiper switch is released. This feature is controlled
by the rear wiper amp. in the same manner as the low speed operation.
REAR WIPER AND WASHER
System Description (Cont'd)
EL-142

Component Parts and Harness Connector
Location
NBEL0072
SEL465X
System DescriptionNBEL0073The rear window defogger system is controlled by the smart entrance control unit. The rear window defogger
operates only for approximately 15 minutes.
Power is supplied at all times
Ito rear window defogger relay terminal 3
Ithrough 20A fuse (No. 56, located in the fuse and fusible link box) and
Ito rear window defogger relay terminal 6
Ithrough 20A fuse (No. 57, located in the fuse and fusible link box)
Ito smart entrance control unit terminal 10
Ithrough 7.5A [No. 24, located in fuse block (J/B)]
With the ignition switch in the ON or START position, power is supplied
Ithrough 7.5A fuse [No. 11, located in the fuse block (J/B)]
Ito the rear window defogger relay terminal 1, and
Ito smart entrance control unit terminal 33.
Ground is supplied
Ito terminal 1 of the rear window defogger switch
Ithrough body grounds M4, M66 and M147(with navigation system),
Ito terminal 32 of the A/C auto amp.
Ithrough body grounds M4, M66 and M147 (without navigation system), or
Ito smart entrance control unit terminal 16
Ithrough body grounds M77 and M111.
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REAR WINDOW DEFOGGER
Component Parts and Harness Connector Location
EL-151

When the rear window defogger switch is turned ON, ground is supplied
Ithrough terminal 2 of the rear window defogger switch (with navigation system), or
Ithrough terminal 31 of A/C auto amp. (without navigation system)
Ito smart entrance control unit terminal 39.
Terminal 2 of the smart entrance control unit then supplies ground to the rear window defogger relay termi-
nal 2.
With power and ground supplied, the rear window defogger relay is energized.
Power is supplied
Ithrough terminals 5 and 7 of the rear window defogger relay
Ito the rear window defogger.
The rear window defogger has an independent ground.
With power and ground supplied, the rear window defogger filaments heat and defog the rear window.
When the system is activated, the rear window defogger indicator illuminates in the rear window defogger
switch.
Power is supplied
Ito terminal 3 of the rear window defogger switch (with navigation system), or
Ito terminal 30 of the A/C auto amp. (without navigation system)
Ifrom terminal 7 of the rear window defogger relay.
Terminal 4 of the rear window defogger switch (with navigation system) or terminal 32 of the A/C auto amp.
(without navigation system), is grounded through body grounds M4, M66 and M147.
REAR WINDOW DEFOGGER
System Description (Cont'd)
EL-152

3 CHECK REAR WINDOW DEFOGGER SWITCH INPUT SIGNAL
Check continuity between smart entrance control unit terminal 39 and ground.
SEL386X
OK or NG
OK©GO TO 4.
NG©Check the following.
IRear window defogger switch (with navigation system)
(Refer to EL-157.)
IA/C auto amp. (without navigation system)
IHarness for open or short between smart entrance control unit and rear window defog-
ger switch (with navigation system) or A/C auto amp. (without navigation system)
IRear window defogger switch (with navigation system) or A/C auto amp. (without navi-
gation system) ground circuit
4 CHECK IGNITION INPUT SIGNAL
Check voltage between smart entrance control unit terminal 33 and ground.
SEL387X
OK or NG
OK©GO TO 5.
NG©Check the following.
I7.5A fuse [No. 11, located in the fuse block (J/B)]
IHarness for open or short between smart entrance control unit and fuse
REAR WINDOW DEFOGGER
Trouble Diagnoses (Cont'd)
EL-156

System DescriptionNBEL0079Refer to Owner's Manual for audio system operating instructions.
Power is supplied at all times
Ithrough 15A fuse [No. 4, located in the fuse block (J/B)]
Ito audio unit terminal 6,
Ito audio amp. relay terminal 3 and
Ito rear speaker amp. terminal 11.
With the ignition switch in the ACC or ON position, power is supplied
Ithrough 10A fuse [No. 10, located in the fuse block (J/B)]
Ito audio unit terminal 10.
Ground is supplied through the case of the audio unit.
Ground is supplied
Ito audio amp. relay terminal 2
Ithrough body grounds M4, M66 and M147
Ito front door speaker LH terminal 5 and
Ito front door speaker RH terminal 5
Ithrough body grounds M77 and M111
Ito rear speaker amp. terminal 24
Ithrough body grounds B11, B22 and D210.
When the audio unit POWER button is pressed, power is supplied
Ito rear speaker amp. terminal 9 and
Ito audio amp. relay terminal 1
Ifrom audio unit terminal 12.
Then audio amp. relay is energized and power is supplied
Ito front door speaker LH terminal 4 and
Ito front door speaker RH terminal 4.
Audio signals are supplied
Ithrough audio unit terminals 1, 2, 3, 4, 13, 14, 15 and 16
Ito terminals 2 and 6 of the LH and RH front speakers and terminals 5, 7, 18 and 20 of the rear speaker
amp.
Ito LH and RH tweeters through terminals 1 and 3 of the front speakers
Ito rear LH and RH speakers through terminals 1, 2, 25 and 26 of the rear speaker amp.
AUDIO
System Description
EL-160

System DescriptionNBEL0084Power is supplied at all times
Ithrough 7.5A fuse [No. 24, located in the fuse block (J/B)]
Ito power antenna terminal 6.
Ground is supplied to the power antenna terminal 2 through body grounds M4, M66 and M147.
When the audio unit is turned to the ON position, battery positive voltage is supplied
Ithrough audio unit terminal 5
Ito power antenna terminal 4.
The antenna raises and is held in the extended position.
When the audio unit is turned to the OFF position, battery positive voltage is interrupted
Ifrom audio unit terminal 5
Ito power antenna terminal 4.
The antenna retracts.GI
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AUDIO ANTENNA
System Description
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System DescriptionNBEL0206OUTLINENBEL0206S01Electric sunroof system consists of
ISunroof switch
ISunroof motor
IPower window relay
ISmart entrance control unit
Smart entrance control unit controls retained power operation.
OPERATIONNBEL0206S02The sunroof can be opened or closed and tilted up or down with the sunroof switch.
AUTO OPERATIONNBEL0206S03The power sunroof AUTO feature makes it possible to open and close the sunroof without holding the sunroof
switch in the down or up position.
RETAINED POWER OPERATIONNBEL0206S04When the ignition switch is turned to OFF position from ON or START position, power is supplied for 45 sec-
onds
Ito power window relay terminal 2
Ifrom smart entrance control unit terminal 5.
Ground is always supplied
Ito power window relay terminal 1
Ithrough body grounds.
When power and ground are supplied, power window relay continues to be energized, and the electrical sun-
roof can be operated.
The retained power operation is canceled when the driver or passenger side door is opened.
INTERRUPTION DETECTION FUNCTIONNBEL0206S05The CPU of sunroof motor monitors the sunroof motor operation and the sunroof position (full closed or other)
for sunroof by the signals from encoder and limit switch in sunroof motor.
When sunroof motor detects interruption during the following close operation,
Iautomatic close operation when ignition switch is in the ªONº position
Iautomatic close operation during retained power operation
sunroof switch controls the motor for open and the sunroof will operate about 150 mm (5.91 in).
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POWER SUNROOF
System Description
EL-173