2008 INFINITI QX56 ignition

NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS SYMPTOMSSEC-113
< SYMPTOM DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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NISSAN VEHICLE IMMOBILIZER SYSTEM-NATS SYMPTOMS
Symptom TableINFOID:0000000001539177
NOTE:
• Before performing the diagnosis in the following table, check “ SEC-3, "
Work Flow"”.
• Check that vehicle is under the condition shown in “Conditions of vehicle” before starting diagnosis, and
check each symptom.
• If the following symptoms are detec ted, check systems shown in the “Diagnosis/service procedure” column
in this order.
CONDITIONS OF VEHICLE (OPERATING CONDITIONS)
• Mechanical key is not inserted into key cylinder.
• Ignition knob switch is not depressed.
Symptom Diagnosis/service procedure Reference page
Security indicator does not turn ON or flash. 1. Check vehicle security indicator
SEC-49
2. Check Intermittent Incident GI-38
Revision: March 2010 2008 QX56

SEC-114
< PRECAUTION >[WITH INTELLIGENT KEY SYSTEM]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint Syst
em (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004874836
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inopera tive, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers , always switch the Ignition OFF, disconnect the
battery, and wait at least 3 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000004874838
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery pow er is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be rotated.
4. Perform the necessary repair operation.
Revision: March 2010 2008 QX56

PRECAUTIONSSEC-115
< PRECAUTION > [WITH INTELLIGENT KEY SYSTEM]
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5. When the repair work is completed, return the ignition switch to the ″LOCK ″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of al l control units using CONSULT-III.
Revision: March 2010 2008 QX56

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INSPECTION AND ADJUSTMENTSN-5
< BASIC INSPECTION >
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INSPECTION AND ADJUSTMENT
Preliminary CheckINFOID:0000000001754055
DESCRIPTION
The purpose of the sonar sensor preliminary check is to confirm that there are no outside factors affecting the
sonar system.
CONDITIONS
• Ignition switch ON
• No obstructions within 3.0 m (10 ft.) of sonar sensors
SONAR SENSOR STATUS CHECK
• Check that the sonar sensors are properly aligned (no deformation in sensor mounting areas).
• Check that snow, mud or other foreign obj ects are not adhering to the sonar sensors.
• Check that there is no deformation, scratc hes or other damage to the sonar sensors.
• Check that water has not accu mulated in the sonar sensors.
CAUTION:
Use water, cotton swab, or other soft material for cleaning the sensors.
1. Check that there are no obstacles wit hin each sonar sensor's detection range.
2. Check that there are no nearby ultrasound sources such as the sounds of vehicle horns, motorcycle
engines or truck air brakes.
3. Check that the vehicle is on a level surface.
Sonar sensors Detection range
Front Approx. 1.0 m (3 ft.) maximum
Rear Approx. 1.8 m (5.9 ft.) maximum
Revision: March 2010 2008 QX56

SN-6
< FUNCTION DIAGNOSIS >
REAR SONAR SYSTEM
FUNCTION DIAGNOSIS
REAR SONAR SYSTEM
System DiagramINFOID:0000000001754056
System DescriptionINFOID:0000000001754057
FUNCTION
With power and ground supplied, transmission gear selector lever in R position, and the sonar system OFF
switch ON, the rear sonar system will detect obstacles withi n 1.8 m (5.9 ft.) of the rear sonar sensors. The
vehicle operator is notified of obstacles by varied rate of tone from the rear sonar buzzer depending on dis-
tance of obstacle being sensed.
SONAR SYSTEM OFF SWITCH
With power and ground supplied to the sonar control unit, transmission gear selector lever in R position, the
sonar system can be disabled and the rear sonar buzze r silenced by momentarily pressing the sonar system
OFF switch. The sonar system OFF indicator lamp will be illuminated in the sonar system OFF switch.
The rear sonar system and buzzer will be disabled and t he sonar system OFF indicator will be illuminated until
the ignition switch is turned OFF. When the ignition switch is turned ON, the rear sonar system will be
enabled. Depressing the sonar system OFF switch again will enable the rear sonar system also. Enabling the
rear sonar system will cause the rear sonar system OFF i ndicator to go out. If the indicator light is blinking
there is a malfunction in the system.
REAR SONAR BUZZER
With power and ground supplied to the sonar control unit and the A/T selector lever in R position, a stationary
object that is at least 7.0 cm (2.8 in.) wide and 1.0 m (39. 0 in.) tall and that is closer than 1.8 m (5.9 ft.) will be
detected by the rear sonar sensors, causing the rear sonar buzzer to sound a tone. As the vehicle moves
closer to the object, the rate of the tone will increase. When the object is less than 25.0 cm (10 in.) from the
rear bumper, the tone will sound continuously.
REAR SONAR SENSORS
With power and ground supplied to the rear sonar sens ors, the sonar sensors transmit an ultrasonic signal.
This signal is reflected back to the sensor by objects large enough and close enough to be detected. The rear
sonar sensors measure the time from the transmitted si gnal to the time the signal is reflected back and sends
this information to the sonar control unit.
BACK-UP LAMP RELAY
The back-up lamp relay provides a reverse signal to the sonar control unit.
AWNIA0127GB
Revision: March 2010 2008 QX56

SN-8
< FUNCTION DIAGNOSIS >
REAR SONAR SYSTEM
1. Turn ignition switch ON. Sonar system OFF switch indicatorlamp illuminates for three seconds and then turns off.
2. Immediately push sonar system OFF switch ten times within five
seconds.
3. The rear sonar buzzer will sound once and the sonar system OFF indicator will flash once.
REQUESTING NUMBER OF FAULT CODES MODE
1. While in "entering diagnostic mode", push sonar system OFF
switch once within 30 seconds of entering diagnostic mode.
NOTE:
If the number of fault codes is not requested within 30 seconds
after entering diagnostic mode, the system will return to regular
operation mode.
2. The rear sonar buzzer will sound once.
3. Sonar system OFF indicator will flash once and rear sonar buzzer will sound once for each fault code detected.
4. There will be a four second pause.
5. The number of fault codes will repeat five times then pause. NOTE:
Self-diagnosis will exit unless "requesting faul t codes mode" occurs before five repeats ends.
REQUESTING FAULT CODES MODE
1. While in "requesting number of fault codes" mode, push sonar
system OFF switch once.
2. The rear sonar buzzer will sound once.
3. Sonar system OFF indicator will flash and rear sonar buzzer will sound the first digit of the fault code followed by a one second
pause.
4. Sonar system OFF indicator will flash and rear sonar buzzer will sound the second digit of the fault code followed by a four sec-
ond pause.
5. Each fault code will repeat five times then pause.
6. Write down each fault code. Then, acknowledge the fault code by pushing the sonar system OFF switch once (the rear sonar buzzer may sound).
NOTE:
"Requesting fault codes mode" will exit unless the f ault code is acknowledged before it is repeated five
times. When all fault codes have been indicated, "clearing fault codes mode" will be entered. Refer to
SN-30, "
DTC Index".
CLEARING FAULT CODES MODE
NOTE:
While in "clearing fault codes mode", self-diagnosis will automatically exit if no activity occurs for 30 seconds.
LKIA0389E
LKIA0388E
LKIA0390E
Revision: March 2010 2008 QX56

SN-10
< FUNCTION DIAGNOSIS >
FRONT AND REAR SONAR SYSTEM
FRONT AND REAR SONAR SYSTEM
System DiagramINFOID:0000000001754061
System DescriptionINFOID:0000000001754062
FUNCTION
With power and ground supplied, transmission gear selector lever in R position, and the sonar system OFF
switch ON, the sonar system will detect obstacles within 1.8 m (5.9 ft.) of the rear sonar sensors and the two
outer front sonar sensors. The vehicle operator is notif ied of obstacles by varied rate of tone from the rear
sonar buzzer depending on distance of obstacle being sens ed. If the vehicle speed reaches 50 km/h (31
MPH) the sonar syst em will shut down.
With power and ground supplied, transmission gear selector lever in a forward drive gear, and the sonar sys-
tem OFF switch ON, the front sonar system will detect obstacles within 1.0 m (3 ft.) of the front sonar sensors.
The vehicle operator is notified of obstacles by varied rate of tone from the front sonar buzzer depending on
distance of obstacle being sensed. When the vehicle accelerates to 12 km/h (7.5 MPH) the sonar system will
shut down. When the vehicle decelerates to 8 km/h (5 MPH) the sonar system will turn back on.
SONAR SYSTEM OFF SWITCH
With power and ground supplied to the sonar control unit, transmission gear selector lever in a position other
than P, the sonar system can be di sabled and the sonar buzzers silenced by momentarily pressing the sonar
system OFF switch. The sonar system OFF indicator lamp will be illuminated in the sonar system OFF switch.
The sonar system and buzzers will be di sabled and the sonar system OFF indicator will be illuminated until the
ignition switch is turned OFF. When the ignition switch is turned ON, the sonar system will be enabled.
Depressing the sonar system OFF switch again will enabl e the sonar system also. Enabling the sonar system
will cause the sonar system OFF indicator to go out. The indicator will flash if a malfunction exists in the sys-
tem.
SONAR BUZZERS
With power and ground supplied to the sonar control unit and the A/T selector lever in R position, a stationary
object that is at least 9.0 cm (3.5 in.) wide and that is closer than 1.8 m (5.9 ft.) will be detected by the rear
sonar sensors and the two outer front sonar sensors, causing the rear sonar buzzer to sound a tone. As the
vehicle moves closer to the object, the rate of the tone will increase. When the object is less than 25.0 cm (10
in.) from the rear bumper, the tone will sound continuously.
With power and ground supplied to the sonar control unit and the A/T selector lever in a forward drive gear, a
stationary object that is at least 9.0 cm (3.5 in.) wide and that is closer than 1.0 m (3 ft.) will be detected by the
front sonar sensors, causing the front sonar buzzer to sound a tone. As the vehicle moves closer to the object,
the rate of the tone will increase. When the object is less than 30 cm (12 in.) from the front bumper, the tone
will sound continuously.
REAR SONAR SENSORS
With power and ground supplied to the rear sonar sens ors, the sonar sensors transmit an ultrasonic signal.
This signal is reflected back to the sensor by objects large enough and close enough to be detected. The rear
AWNIA0128GB
Revision: March 2010 2008 QX56

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POWER SUPPLY AND GROUND CIRCUITSN-13
< COMPONENT DIAGNOSIS >
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COMPONENT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure Fo r Rear Sonar SystemINFOID:0000000001754066
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1.CHECK FUSES
Check for blown rear sonar system fuses.
Are any fuses blown?
YES >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to GI-
41, "Circuit Inspection".
NO >> GO TO 2.
2.CHECK POWER SUPPLY CIRCUIT
1. Disconnect sonar control unit connector.
2. Turn ignition switch ON.
3. Check voltage between sonar control unit connector B56 termi- nal 8 and ground.
Is there battery voltage?
YES >> GO TO 3.
NO >> Check harness for open between sonar control unit and fuse.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between sonar control unit B56 terminal 6 and ground.
Is there continuity?
YES >> Inspection End.
NO >> Check harness ground circuit.
Diagnosis Procedure For Fron t And Rear Sonar SystemINFOID:0000000001754067
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1.CHECK FUSES
Check for blown sonar system fuses.
Unit Power Source FuseLocation
Sonar control unit ON or START 12
Fuse block (J/B)
51 IPDM E/R
Terminals Ignition switch position
(+) (-) ON or START
Connector Terminal
B56 8 Ground Battery voltage
WKIA1145E
Te r m i n a l s
Continuity
(+)
(–)
Connector Terminal
B56 6 Ground Yes
WKIA1146E
Revision: March 2010 2008 QX56