2001 INFINITI QX4 engine

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 DescriptionNBEL0120DESCRIPTIONNBEL0120S011. Operation FlowNBEL0120S0101
SEL334W
2. Setting The Theft Warning SystemNBEL0120S0102Initial condition
1) Close all doors.
2) Close hood and glass hatch.
Disarmed phase
When the theft warning system is in the disarmed phase, the security indicator lamp blinks every 2.6 seconds.
Pre-armed phase and armed phase
The theft warning system turns into the ªpre-armedº phase when hood, glass hatch and all doors are closed
and the doors are locked by key or multi-remote controller. (The security indicator lamp illuminates.)
After about 30 seconds, the system automatically shifts into the ªarmedº phase (the system is set). (The
security indicator lamp blinks every 2.6 seconds.)
3. Canceling The Set Theft Warning SystemNBEL0120S0103When the following 1) or 2) operation is performed, the armed phase is canceled.
1) Unlock the doors with the key or multi-remote controller.
2) Open the glass hatch with the key.
4. Activating The Alarm Operation of The Theft Warning SystemNBEL0120S0104Make sure the system is in the armed phase. (The security indicator lamp blinks every 2.6 seconds.)
When any of the following operations is performed, the system sounds the horns and flashes the headlamps
for about 50 seconds.
1) Engine hood, glass hatch or any door is opened before unlocking door with key or multi-remote control-
ler.
2) Door is unlocked without using key or multi-remote controller.
3) Disconnecting and connecting the battery connector before canceling armed phase.
POWER SUPPLY AND GROUNDNBEL0120S07Power is supplied at all times
Ithrough 7.5A fuse [No. 24, located in the fuse block (J/B)]
Ito security indicator lamp terminal 1, and
Ito smart entrance control unit terminal 10.
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)]
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THEFT WARNING SYSTEM
System Description
EL-295

System Description=NBEL0171NATS (Nissan Anti-Theft System) has the following immobilizer functions:
ISince only IVIS (NATS) ignition keys, whose ID nos. have been registered into the ECM and IMMU of IVIS
(NATS), allow the engine to run, operation of a stolen vehicle without an IVIS (NATS) registered key is
prevented by IVIS (NATS).
That is to say, IVIS (NATS) will immobilise the engine if someone tries to start it without the registered key
of IVIS (NATS).
IAll of the originally supplied ignition key IDs (except for card plate key) have been IVIS (NATS) registered.
If requested by the vehicle owner, a maximum of five key IDs can be registered into the IVIS (NATS) com-
ponents.
IThe security indicator blinks when the ignition switch is in ªOFFº or ªACCº position. Therefore, IVIS (NATS)
warns outsiders that the vehicle is equipped with the anti-theft system.
IWhen IVIS (NATS) detects trouble, the security indicator lamp lights up while ignition key is in the ªONº
position.
IIVIS (NATS) trouble diagnoses, system initialization and additional registration of other IVIS (NATS) igni-
tion key IDs must be carried out using CONSULT-II hardware and CONSULT-II IVIS (NATS) software.
When IVIS (NATS) initialization has been completed, the ID of the inserted ignition key is automatically
IVIS (NATS) registered. Then, if necessary, additional registration of other IVIS (NATS) ignition key IDs
can be carried out.
Regarding the procedures of IVIS (NATS) initialization and IVIS (NATS) ignition key ID registration, refer
to CONSULT-II operation manual, IVIS/NVIS.
IWhen servicing a malfunction of the IVIS (NATS) (indicated by lighting up of Security Indicator
Lamp) or registering another IVIS (NATS) ignition key ID no., it is necessary to re-register original
key identification. Therefore, be sure to receive ALL KEYS from vehicle owner.
System CompositionNBEL0172The immobiliser function of the IVIS (NATS) consists of the following:
IIVIS (NATS) ignition key
IIVIS (NATS) immobilizer control unit (IMMU) located in the ignition key cylinder
IEngine control module (ECM)
ISecurity indicator
SEL085WE
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IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM Ð NATS)
System Description
EL-329

NOTE:
IWhen any initialization is performed, all ID previously reg-
istered will be erased and all IVIS (NATS) ignition keys
must be registered again.
IThe engine cannot be started with an unregistered key. In this
case, the system will show ªDIFFERENCE OF KEYº or ªLOCK
MODEº as a self-diagnostic result on the CONSULT-II screen.
IIn rare case, ªCHAIN OF ECM-IMMUº might be stored as a
self-diagnostic result during key registration procedure, even if
the system is not malfunctioning.
HOW TO READ SELF-DIAGNOSTIC RESULTSNBEL0223S03
SEL364X
IVIS (NATS) SELF-DIAGNOSTIC RESULTS ITEM CHARTNBEL0223S04
Detected items (NATS program card
screen terms)P No. Code
(Self-diag-
nostic
result of
ªENGINEºMalfunction is detected when .....
Reference page
ECM INT CIRC-IMMUNATS MAL-
FUNCTION
P1613The malfunction of ECM internal circuit of IMMU com-
munication line is detected. EL-336
CHAIN OF ECM-IMMUNATS MAL-
FUNCTION
P1612Communication impossible between ECM and IMMU
(In rare case, ªCHAIN OF ECM-IMMUº might be stored
during key registration procedure, even if the system is
not malfunctioning.)EL-337
DIFFERENCE OF KEYNATS MAL-
FUNCTION
P1615IMMU can receive the key ID signal but the result of ID
verification between key ID and IMMU is NG. EL-341
CHAIN OF IMMU-KEYNATS MAL-
FUNCTION
P1614IMMU cannot receive the key ID signal.
EL-342
ID DISCORD, IMM-ECMNATS MAL-
FUNCTION
P1611The result of ID verification between IMMU and ECM is
NG. System initialization is required. EL-343
IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM Ð NATS)
CONSULT-II (Cont'd)
EL-332

Detected items (NATS program card
screen terms)P No. Code
(Self-diag-
nostic
result of
ªENGINEºMalfunction is detected when .....
Reference page
LOCK MODENATS MAL-
FUNCTION
P1610When the starting operation is carried out five or more
times consecutively under the following conditions, IVIS
(NATS) will shift the mode to one which prevents the
engine from being started.
IUnregistered ignition key is used.
IIMMU or ECM's malfunctioning.EL-346
DON'T ERASE BEFORE
CHECKING ENG DIAGÐAll engine trouble codes except IVIS (NATS) trouble
code has been detected in ECM.EL-334GI
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IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM Ð NATS)
CONSULT-II (Cont'd)
EL-333

SYMPTOM MATRIX CHART 1NBEL0224S02(Self-diagnosis related item)
SYMPTOMDisplayed ªSELF-DIAG
RESULTSº on CON-
SULT-II screen.DIAGNOSTIC PROCE-
DURE
(Reference page)SYSTEM
(Malfunctioning part or
mode)REFERENCE PART NO.
OF ILLUSTRATION ON
NEXT PAGE
ISecurity indicator
lighting up*
IEngine cannot be
started.ECM INT CIRC-IMMUPROCEDURE 1
(EL-336)ECM B
CHAIN OF ECM-IMMUPROCEDURE 2
(EL-337)In rare case, ªCHAIN
OF ECM-IMMUº might
be stored during key
registration procedure,
even if the system is
not malfunctioning.Ð
Open circuit in battery
voltage line of IMMU
circuitC1
Open circuit in ignition
line of IMMU circuitC2
Open circuit in ground
line of IMMU circuitC3
Open circuit in commu-
nication line between
IMMU and ECMC4
Short circuit between
IMMU and ECM com-
munication line and bat-
tery voltage lineC4
Short circuit between
IMMU and ECM com-
munication line and
ground lineC4
ECM B
IMMU A
DIFFERENCE OF KEYPROCEDURE 3
(EL-341)Unregistered key D
IMMU A
CHAIN OF IMMU-KEYPROCEDURE 4
(EL-342)Malfunction of key ID
chipE
IMMU A
ID DISCORD, IMM-
ECMPROCEDURE 5
(EL-343)System initialization has
not yet been com-
pleted.F
ECM F
LOCK MODEPROCEDURE 7
(EL-346)LOCK MODE D
IMIL staying ON
ISecurity indicator
lighting up*DON'T ERASE
BEFORE CHECKING
ENG DIAGWORK FLOW
(EL-334)Engine trouble data and
IVIS (NATS) trouble
data have been
detected in ECMÐ
*: When IVIS (NATS) detects trouble, the security indicator lights up while ignition key is in the ªONº position.
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IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM Ð NATS)
Trouble Diagnoses (Cont'd)
EL-335

DIAGNOSTIC PROCEDURE 3=NBEL0224S07Self-diagnostic results:
ªDIFFERENCE OF KEYº displayed on CONSULT-II screen
1 CONFIRM SELF-DIAGNOSTIC RESULTS
Confirm SELF-DIAGNOSTIC RESULTS ªDIFFERENCE OF KEYº displayed on CONSULT-II screen.
SEL367X
Is CONSULT-II screen displayed as above?
Ye s©GO TO 2.
No©GO TO SYMPTOM MATRIX CHART 1.
2 PERFORM INITIALIZATION WITH CONSULT-II
Perform initialization with CONSULT-II. Re-register all IVIS (NATS) ignition key IDs.
For initialization and registration of IVIS (NATS) ignition key IDs, refer to ªCONSULT-II operation manual IVIS/NVISº.
SEL297W
NOTE:
If the initialization is not completed or fails, CONSULT-II shows above message on the screen.
Can the system be initialized and can the engine be started with re-registered IVIS (NATS) ignition key?
Ye s©Ignition key ID was unregistered.Ref. part No. D
No©IMMU is malfunctioning.
Replace IMMU.Ref. part No. A
Perform initialization with CONSULT-II.
For initialization, refer to ªCONSULT-II operation manual IVIS/NVISº.
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IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM Ð NATS)
Trouble Diagnoses (Cont'd)
EL-341

DIAGNOSTIC PROCEDURE 4=NBEL0224S08Self-diagnostic results:
ªCHAIN OF IMMU-KEYº displayed on CONSULT-II screen
1 CONFIRM SELF-DIAGNOSTIC RESULTS
Confirm SELF-DIAGNOSTIC RESULTS ªCHAIN OF IMMU-KEYº displayed on CONSULT-II screen.
SEL368X
Is CONSULT-II screen displayed as above?
Ye s©GO TO 2.
No©GO TO SYMPTOM MATRIX CHART 1.
2 CHECK IVIS (NATS) IGNITION KEY ID CHIP
Start engine with another registered IVIS (NATS) ignition key.
Does the engine start?
Ye s©Ignition key ID chip is malfunctioning.
Replace the ignition key.
Ref. part No. E
Perform initialization with CONSULT-II.
For initialization, refer to ªCONSULT-II Operation Manual IVIS/NVISº.
No©GO TO 3.
3 CHECK IMMU INSTALLATION
Check IMMU installation.
Refer to ªHow to Replace IMMUº in EL-347.
OK or NG
OK©IMMU is malfunctioning.
Replace IMMU.Ref. part No. A
Perform initialization with CONSULT-II.
For initialization, refer to ªCONSULT-II Operation Manual IVIS/NVISº.
NG©Reinstall IMMU correctly.
IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM Ð NATS)
Trouble Diagnoses (Cont'd)
EL-342