2007 INFINITI QX56 ignition

WARNING CHIME
DI-45
< SERVICE INFORMATION >
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3.CHECK COMBINATION METER INPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between combination meter harness connector
M24 terminal 27 and ground.
OK or NG
OK >> Replace the combination meter. Refer to IP-10, "Removal and Installation".
NG >> GO TO 4.
4.CHECK SEAT BELT BUCKLE SWITCH
1. Turn ignition switch OFF.
2. Disconnect seat belt buckle pre-tensioner assembly LH (seat
belt buckle switch) connector.
3. Check continuity between seat belt buckle pre-tensioner assem-
bly LH (seat belt buckle switch) terminals 3 and 4.
OK or NG
OK >> GO TO 5.
NG >> Replace the seat belt buckle pre-tensioner assembly LH (seat belt buckle switch).
5.CHECK SEAT BELT BUCKLE SWITCH CIRCUIT
1. Disconnect combination meter connector.
2. Check continuity between combination meter harness connector
M24 (B) terminal 27 and seat belt buckle pre-tensioner assem-
bly LH (seat belt buckle switch) harness connector B74 (A) ter-
minal 4.
3. Check continuity between combination meter harness connector
M24 (B) terminal 27 and ground.
OK or NG
OK >> Check seat belt buckle pre-tensioner assembly LH (seat belt buckle switch) ground circuit.
NG >> Repair harness or connector.
Te r m i n a l s
ConditionVoltage (V)
(Approx.) (+)
(–)
Connector Terminal
M24 27 GroundSeat belt is fastened Battery voltage
Seat belt is unfastened 0
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Terminals Condition Continuity
34Seat belt is fastened No
Seat belt is unfastened Yes
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Continuity should exist.
Continuity should not exist.
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DI-46
< SERVICE INFORMATION >
REAR SONAR SYSTEM
REAR SONAR SYSTEM
Component Parts and Harness Connector LocationINFOID:0000000003533524
System DescriptionINFOID:0000000003533525
FUNCTION
With the ignition switch in the ON or START position, power is supplied
• through 10A fuse [No. 12, located in the fuse block (J/B)]
• to sonar control unit terminal 8,
• through 10A fuse (No. 51, located in the IPDM E/R)
• to back-up lamp relay terminals 1 and 3.
1. Fuse block (J/B) 2. IPDM E/R E119 3. Sonar buzzer M117
4. Rear sonar system OFF switch M116 5. Sonar control unit B56 (view of left
rear body)6. Rear sonar sensor LH outer C102
7. Rear sonar sensor LH inner C103 8. Rear sonar sensor RH inner C104 9. Rear sonar sensor RH outer C105
10. A/T assembly F9 11. Back-up lamp relay M73
WKIA4595E

REAR SONAR SYSTEM
DI-47
< SERVICE INFORMATION >
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Ground is supplied
• to sonar control unit terminal 6
• through body grounds B7 and B19.
With the ignition switch in the ON or START position, and the transmission gear selector lever in the R posi-
tion, power is supplied
• to sonar control unit terminal 5
• from back-up lamp relay terminal 5.
With power and ground supplied, transmission gear selector lever in R position, and the rear sonar system
OFF switch ON, the rear sonar system will detect obstacles within 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 sonar buzzer depending on distance of
obstacle being sensed.
REAR 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 sonar buzzer silenced by momentarily pressing the rear sonar system
OFF switch. The rear sonar system OFF indicator lamp will be illuminated in the rear sonar system OFF
switch.
To disable the rear sonar system, ground is supplied
• to sonar control unit terminal 13
• through rear sonar system OFF switch terminal 1
• through rear sonar system OFF switch terminal 2
• from body grounds M57, M61, and M79.
To light the rear sonar system OFF indicator, power is supplied
• from sonar control unit terminal 4
• to the rear sonar system OFF switch terminal 5.
Ground is supplied
• to the rear sonar system OFF switch terminal 6
• from body grounds M57, M61, and M79.
The rear sonar system and buzzer will be disabled and the rear 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 rear sonar system OFF switch momentarily will enable the rear sonar system also.
Enabling the rear sonar system will cause the rear sonar system OFF indicator to go out.
SONAR BUZZER
With power supplied to the sonar control unit and the transmission gear selector lever in R position, a station-
ary 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 meters (5.9 ft.)
will be detected by the rear sonar sensors, causing the 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.
Power is supplied
• from sonar control unit terminal 7
• to sonar buzzer terminal +.
Ground is supplied
• to sonar buzzer terminal -
• from sonar control unit terminal 3.
REAR SONAR SENSOR
With power and ground supplied to the rear sonar sensors, the sonar sensors transmit a 38.4 kHz 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 signal to the time the signal is reflected back
and sends this information to the sonar control unit.
Power is supplied
• from sonar control unit terminal 16
• to each rear sonar sensor terminal 1.
Ground is supplied
• to each rear sonar sensor terminal 3
• from sonar control unit terminal 15.
Signal is supplied
• from each rear sonar sensor terminal 2
• to sonar control unit terminals 9, 10, 11 and 12.

DI-50
< SERVICE INFORMATION >
REAR SONAR SYSTEM
Sonar Control Unit Harness Connector Terminal Layout
INFOID:0000000003533527
Terminal and Reference Value for Sonar Control UnitINFOID:0000000003533528
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Te r m i n a l
(color)ItemCondition
Reference value (V)
(Approx.) Ignition
switchOperation
3 (R) Sonar buzzer return ON — 0 - 12 (variable)
4 (BR/Y)Rear sonar system
OFF indicator outputONRear sonar system OFF
switch ON 0
OFF Battery voltage
5 (G/W) Reverse signal ONTransmission gear se-
lector leverR position Battery voltage
Transmission gear se-
lector leverNot R position 0
6 (B)Sonar control unit
ground —— 0
7 (L) Sonar buzzer drive
signalON — Battery voltage
8 (G/R)Sonar control unit
powerON — Battery voltage
9 (GR)Rear sonar sensor
signal - RH outerON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstaclesBattery voltage
10 (P)Rear sonar sensor
signal - LH outerON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstaclesBattery voltage
11 ( O )Rear sonar sensor
signal - LH innerON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstaclesBattery voltage
12 (LG)Rear sonar sensor
signal - RH innerON• Rear sonar system OFF switch ON
• Transmission gear selector lever in R po-
sition
• No obstaclesBattery voltage
13 (LG)Rear sonar system
OFF switch signalONRear sonar system OFF
switchON 0
OFF Battery voltage
15 (Y)Rear sonar sensor
groundON — 0
16 (LG/B)Rear sonar sensor
powerON Ignition switch ON Battery voltage

REAR SONAR SYSTEM
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< SERVICE INFORMATION >
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How to Proceed with Trouble DiagnosisINFOID:0000000003533529
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to DI-46, "
System Description".
3. Perform pre-diagnosis inspection. Refer to DI-51, "
Pre-diagnosis Inspection".
4. Perform self-diagnosis. Refer to DI-51, "
Self-Diagnosis Function".
5. Perform the preliminary check. Refer to DI-53, "
Preliminary Check".
6. Check symptom and repair or replace the cause of malfunction. Refer to DI-54, "
Symptom Chart".
7. Does the rear sonar system operate properly? If so, go to 8. If not, go to 3.
8. Clear fault codes. Refer to DI-51, "
Self-Diagnosis Function".
9. Inspection End.
Pre-diagnosis InspectionINFOID:0000000003533530
SENSOR STATUS CHECK
• Check that the rear sonar sensor is properly aligned (bumper is not misaligned, no deformation in sensor
mounting area.
• Check that snow, mud, or other foreign objects are not adhering to the rear sonar sensor.
• Check that there is no deformation, scratches, or other damage to the rear sonar sensor.
• Check that water has not accumulated in the rear sonar sensor.
CAUTION:
Use water, cotton swab, or other soft material for cleaning the sensor.
1. Check that there are no obstacles within each rear 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.
Self-Diagnosis FunctionINFOID:0000000003533531
There are four modes of self-diagnosis; entering diagnostics, requesting number of fault codes, requesting
fault codes, and idling or clearing fault codes. These steps must be followed in order. Self-diagnosis can be
manually exited by turning the ignition switch OFF, or selecting reverse gear. Self-diagnosis will exit unless a
fault code request occurs before a message is repeated five times without acknowledgement.
ENTERING DIAGNOSTICS MODE
1. Turn ignition switch ON. Rear sonar system OFF switch indica-
tor lamp illuminates for three seconds and then turns off.
2. Immediately push rear sonar system OFF switch ten times
within five seconds.
3. The sonar buzzer will sound once and the rear sonar system
OFF indicator will flash once.
REQUESTING NUMBER OF FAULT CODES MODE
Detection range
Rear sonar sensors Approx. 1.8 m (5.9 ft.) maximum
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REAR SONAR SYSTEM
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< SERVICE INFORMATION >
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1. Push and hold rear sonar system OFF switch for three seconds
to reset time-out counter.
2. Push and hold rear sonar system OFF switch for three seconds
to clear codes.
Preliminary CheckINFOID:0000000003533532
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1.CHECK FUSE
Check for blown rear sonar system fuse.
Refer to DI-48, "
Wiring Diagram - SONAR -".
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of problem before installing new fuse. Refer to PG-3
.
2.CHECK POWER SUPPLY CIRCUIT
1. Disconnect sonar control unit connector.
2. Check voltage between sonar control unit connector B56 termi-
nal 8 and ground.
OK or NG
OK >> GO TO 3.
NG >> 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.
OK or NG
OK >> Inspection End.
NG >> Check harness ground circuit.
LKIA0391E
Unit Power Source Fuse
Sonar control unit ON or START 12
Terminals Ignition switch position
(+)
(-) ON or START
Connector Terminal
B56 8 Ground Battery voltage
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Te r m i n a l s
Continuity (+)
(–)
Connector Terminal
B56 6 Ground Yes
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REAR VIEW MONITOR
DI-59
< SERVICE INFORMATION >
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• to rear view camera control unit terminal 1.
When ignition switch is in ACC or ON position, power is supplied
• through 10A fuse [No. 4, located in the fuse block (J/B)]
• to rear view camera control unit terminal 2.
Ground is supplied
• to rear view camera control unit terminal 3 and
• to rear view camera terminal 2
• through grounds B7 and B19.
AV COMMUNICATION LINE
Rear view camera control unit is connected to the following units with AV communication line. Each unit trans-
mits/receives data with AV communication line.
• NAVI control unit
• Display unit
• Display control unit
• AV switch
REAR VIEW CAMERA OPERATION
When ignition switch is in ON or START position, power is supplied
• through 10A fuse (No. 51, located in the IPDM E/R)
• to back-up lamp relay terminals 1 and 3.
When A/T selector lever is in reverse position, power is supplied
• through back-up lamp relay terminal 2
• to TCM terminal 7.
Then, when back-up lamp relay is energized,
• from back-up lamp relay terminal 5
• to rear view camera control unit terminal 4.
Then, rear view camera control unit is sent camera ON signal
• through rear view camera control unit terminal 8
• to rear view camera terminal 1.
An image taken by rear view camera is sent
• through rear view camera terminals 3 and 4
• to rear view camera control unit terminals 10 and 9.
Then an image is sent
• through rear view camera control unit terminals 11 and 12
• to display unit terminals 4 and 15.
An image of rear view will be projected on the display.
Side Distance Guideline
When A/T selector lever is in reverse position, rear view camera control unit is sent rear view camera guideline
image
• through rear view camera control unit terminals 11 and 12
• to display unit terminals 4 and 15.
Rear view camera guideline will be projected on the display.
Display shows image from rear view camera image and rear view camera guideline.

DI-64
< SERVICE INFORMATION >
REAR VIEW MONITOR
Rear View Camera Control Unit Harness Connector Terminal Layout
INFOID:0000000003533542
Terminal and Reference Value for Rear View Camera Control UnitINFOID:0000000003533543
CONSULT-II Function (REARVIEW CAMERA)INFOID:0000000003533544
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
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Te r m i n a l
No.Wire
colorItemCondition
Reference value (V)
(Approx.) Ignition
switchOperation
1 Y Battery power OFF — Battery voltage
2 V ACC power ACC — Battery voltage
3 B Ground ON — 0
4 G/W Reverse signal input ONA/T selector lever R position Battery voltage
A/T selector lever in other than R
position0
5BRAV Control ONA/T selector lever R position 0
—0
6G/WDDL — — —
8 Y Camera power output ON A/T selector lever R position 6
9 — Camera image input (–) ON — 0
10 G Camera image input (+) ON A/T selector lever R position
11 — Shield ground — — —
12 W Composite image output ON A/T selector lever R position
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