2001 INFINITI QX4 relay

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

Trouble DiagnosesNBEL0075DIAGNOSTIC PROCEDURENBEL0075S01SYMPTOM: Rear window defogger does not activate, or does
not go off after activating.
1 CHECK REAR WINDOW DEFOGGER OUTPUT SIGNAL
1. Turn ignition switch to ON position.
2. Check voltage between smart entrance control unit harness terminal 2 and ground.
SEL384X
OK or NG
OK©Check the following.
IRear window defogger relay
(Refer to EL-157.)
IRear window defogger circuit
IRear window defogger filament
(Refer to EL-157.)
NG©GO TO 2.
2 CHECK DEFOGGER RELAY COIL SIDE CIRCUIT
1. Disconnect smart entrance control unit connector.
2. Turn ignition switch to ON position.
3. Check voltage between smart entrance control unit terminal 2 and ground.
SEL385X
OK or NG
OK©GO TO 3.
NG©Check the following.
I7.5A fuse [No. 11, located in the fuse block (J/B)]
IRear window defogger relay
IHarness for open or short between rear window defogger relay and smart entrance
control unit
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REAR WINDOW DEFOGGER
Trouble Diagnoses
EL-155

5 CHECK SMART ENTRANCE CONTROL UNIT GROUND CIRCUIT
Check continuity between smart entrance control unit terminal 16 and ground.
SEL388X
OK or NG
OK©Replace smart entrance control unit.
NG©Repair harness or connectors.
SEC202B
Electrical Components InspectionNBEL0076REAR WINDOW DEFOGGER RELAYNBEL0076S01Check continuity between terminals 3 and 5, 6 and 7.
Condition Continuity
12V direct current supply between ter-
minals 1 and 2Ye s
No current supply No
SEL430TB
REAR WINDOW DEFOGGER SWITCHNBEL0076S02Check continuity between terminals when rear window defogger
switch is pushed and released.
Terminals Condition Continuity
1-2Rear window defogger
switch is pushedYe s
Rear window defogger
switch is releasedNo
SEL263
Filament CheckNBEL00771. Attach probe circuit tester (in volt range) to middle portion of
each filament.
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REAR WINDOW DEFOGGER
Trouble Diagnoses (Cont'd)
EL-157

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

Trouble DiagnosesNBEL0082AUDIO UNITNBEL0082S01
Symptom Possible causes Repair order
Audio unit inoperative (no
digital display and no
sound from speakers).1. 10A fuse
2. Poor audio unit case ground
3. Audio unit1. Check 10A fuse [No. 10, located in fuse block (J/B)].
Turn ignition switch ON and verify that battery posi-
tive voltage is present at terminal 10 of audio unit.
2. Check audio unit case ground.
3. Remove audio unit for repair.
Audio unit presets are lost
when ignition switch is
turned OFF.1. 15A fuse
2. Audio unit1. Check 15A fuse [No. 4, located in fuse block (J/B)]
and verify that battery positive voltage is present at
terminal 6 of audio unit.
2. Remove audio unit for repair.
AM stations are weak or
noisy (FM stations OK).1. Antenna
2. Poor audio unit ground
3. Audio unit1. Check antenna.
2. Check audio unit ground.
3. Remove audio unit for repair.
FM stations are weak or
noisy (AM stations OK).1. Window antenna
2. Audio unit1. Check window antenna.
2. Remove audio unit for repair.
Audio unit generates noise
in AM and FM modes with
engine running.1. Poor audio unit ground
2. Loose or missing ground bonding
straps
3. Ignition condenser or rear window
defogger noise suppressor condenser
4. Alternator
5. Ignition coil or secondary wiring
6. Audio unit1. Check audio unit ground.
2. Check ground bonding straps.
3. Replace ignition condenser or rear window defogger
noise suppressor condenser.
4. Check alternator.
5. Check ignition coil and secondary wiring.
6. Remove audio unit for repair.
Audio unit generates noise
in AM and FM modes with
accessories on (switch
pops and motor noise).1. Poor audio unit ground
2. Antenna
3. Accessory ground
4. Faulty accessory1. Check audio unit ground.
2. Check antenna.
3. Check accessory ground.
4. Replace accessory.
Audio unit controls are
operational, but no sound
is heard from any speaker.1. 15A fuse
2. Audio unit output
3. Audio unit1. Check 15A fuse [No. 4, located in fuse block (J/B)].
Verify battery positive voltage is present at terminal 3
of audio amp. relay.
2. Check audio unit output voltage (Terminal 12).
3. Remove audio unit for repair.
All front speakers are inop-
erative.1. Audio amp. relay
2. Audio amp. relay ground
3. Amp. ON signal1. Check audio amp. relay.
2. Check audio amp. relay ground (Terminal 2).
3. Turn ignition switch ACC and audio unit ON. Verify
battery positive voltage is present at terminal 1 of
audio amp. relay.
Individual front speaker is
noisy or inoperative.1. Speaker ground
2. Power supply
3. Audio unit output
4. Speaker1. Check speaker ground (Terminal 5).
2. Check power supply for speaker (Terminal 4).
3. Check audio unit output voltage for speaker.
4. Replace speaker.
Both rear speakers are
inoperative.1. Poor rear speaker amp. ground
2. Power supply
3. Amp. ON signal
4. Rear speaker amp.1. Check rear speaker amp. ground circuit.
2. Check power supply for rear speaker amp. (Terminal
11).
3. Turn ignition switch ACC and audio unit ON. Verify
battery positive voltage is present at terminal 9 of
rear speaker amp.
4. Remove rear speaker amp. for repair.
Individual rear speaker is
noisy or inoperative.1. Speaker
2. Audio unit/amp. output
3. Speaker circuit
4. Audio unit1. Check speaker.
2. Check audio unit/amp. output.
3. Check wires for open or short between audio unit/
amp. and speakers.
4. Remove audio unit for repair.
AUDIO
Trouble Diagnoses
EL-166

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

Trouble DiagnosesNBEL0207
Symptom Possible cause Repair order
Power sunroof cannot be operated
using any switch.1. 7.5A fuse, 40A fusible link and
M145 circuit breaker
2. Power window relay ground cir-
cuit
3. Sunroof motor ground circuit
4. Power window relay
5. Sunroof motor circuit
6. Sunroof switch
7. Sunroof switch circuit
8. Sunroof motor1. Check 7.5A fuse [No. 11, located in fuse block
(J/B)], 40A fusible link (letterf, located in fuse and
fusible link box) and M145 circuit breaker. Turn igni-
tion switch ªONº and verify battery positive voltage
is present at terminals 2 and 3 of power window
relay and terminal 1 of sunroof motor.
2. Check power window relay ground circuit.
3. Check sunroof motor ground circuit.
4. Check power window relay.
5. Check the wire between power window relay and
sunroof motor.
6. Check sunroof switch.
7. Check harness between sunroof switch and sunroof
motor.
8. Check sunroof motor.
Power sunroof cannot be operated
using one of the sunroof switches.1. Sunroof switch
2. Sunroof switch circuit1. Check sunroof switch.
2. Check the harness between sunroof motor and sun-
roof switch.
Power sunroof auto function cannot
be operated properly.1. Sunroof slide mechanism
2. Sunroof switch
3. Sunroof switch circuit
4. Sunroof motor1. Check the following.
a. Check obstacles in sunroof, etc.
b. Check worn or deformed sunroof.
c. Check sunroof sash tilted too far inward or outward.
2. Check sunroof switch.
3. Check harness between sunroof motor and sunroof
switch.
4. Replace sunroof motor.
Retained power operation does not
operate properly.1. RAP signal circuit
2. Driver or passenger side door
switch circuit
3. Smart entrance control unit1. Check harness between power window relay termi-
nal 2 and smart entrance control unit terminal 5.
2. Check the following.
a. Harness between smart entrance control unit and
driver or passenger side door switch for short circuit
b. Driver or passenger side door switch ground circuit
c. Driver or passenger side door switch
3. Check smart entrance control unit. (EL-324)
POWER SUNROOF
Trouble Diagnoses
EL-176