2006 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2006 Factory Service Manual DI-64
REAR SONAR SYSTEM
Revision: November 20092006 QX56
WKWA1177E

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INFINITI QX56 2006 Factory Service Manual REAR SONAR SYSTEMDI-65
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Revision: November 2009 2006 QX56
Terminals And Reference Value For Sonar Control UnitEKS00BD5
How to Proceed With Trouble DiagnosisEKS00BD6
1. Confirm

REAR SONAR SYSTEMDI-65
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Terminals And Reference Value For Sonar Control UnitEKS00BD5
How to Proceed With Trouble DiagnosisEKS00BD6
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to DI-61, "
System Description" .
3. Perform pre-diagnosis inspection. Refer to DI-66, "
Pre-diagnosis Inspection" .
4. Perform self-diagnosis. Refer to DI-66, "
Self-diagnosis Function" .
5. Perform the preliminary check. Refer to DI-68, "
Preliminary Check" .
6. Check symptom and repair or replace the cause of malfunction. Refer to DI-69, "
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-67, "
IDLING OR CLEARING FAULT CODES MODE" .
9. Inspection End.
TERMINAL (COLOR) ITEM CONDITION
Reference value (V)
(Approx.)
IGNITION
SWITCH OPERATION
3 (R) Sonar buzzer return ON —0 - 12 (variable)
4 (BR/Y) Rear sonar system
OFF indicator output ONRear sonar system OFF
switch ON
0
OFF 12
5 (G/W) Reverse signal ONTransmission gear
selector lever
R position
12
Transmission gear
selector lever Not R position
0
6 (B) Sonar control unit
ground ——
0
7 (L) Sonar buzzer drive signal ON
— 12
8 (G/R) Sonar control unit
power
ON
— 12
9 (GR) Rear sonar sensor
signal - RH outer ON
Rear sonar system OFF switch ON
Transmission gear selector lever in R
position
No obstacles 12
10 (P) Rear sonar sensor
signal - LH outer ON
Rear sonar system OFF switch ON
Transmission gear selector lever in R
position
No obstacles 12
11 ( O ) Rear sonar sensor
signal - LH inner ON
Rear sonar system OFF switch ON
Transmission gear selector lever in R
position
Distance obstacles 12
12 (LG) Rear sonar sensor
signal - RH inner ON
Rear sonar system OFF switch ON
Transmission gear selector lever in R
position
Distance obstacles 12
13 (LG) Rear sonar system
OFF switch signal ONRear sonar system OFF
switch ON
0
OFF 12
15 (Y) Rear sonar sensor
ground ON
— 0
16 (LG/B) Rear sonar sensor
power ON Ignition switch ON
12

Page 1187 of 3383

INFINITI QX56 2006 Factory Service Manual DI-66
REAR SONAR SYSTEM
Revision: November 20092006 QX56
Pre-diagnosis InspectionEKS00BD7
SENSOR STATUS CHECK
Check that the rear sonar sensor is properly aligned (bumper is not misaligned, no deform

DI-66
REAR SONAR SYSTEM
Revision: November 20092006 QX56
Pre-diagnosis InspectionEKS00BD7
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 FunctionEKS00BD8
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
1. While in diagnostic mode, push rear sonar system OFF switch
once.
2. The sonar buzzer will sound once.
3. Rear sonar system OFF indicator will flash once and 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 fault codes occurs
before five repeats ends.
Detection range
Rear sonar sensors Approx. 1.8 m (5.9 ft.) maximum
LKIA0389E
LKIA0388E

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INFINITI QX56 2006 Factory Service Manual REAR SONAR SYSTEMDI-67
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REQUESTING FAULT CODES MODE
1. While in "requesting number of fault codes" mode, push rear
sonar system OFF switch on

Page 1189 of 3383

INFINITI QX56 2006 Factory Service Manual DI-68
REAR SONAR SYSTEM
Revision: November 20092006 QX56
Preliminary CheckEKS00BD9
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSE
Check for blown rear sonar system fuse.
Refer to DI-63,

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INFINITI QX56 2006 Factory Service Manual REAR SONAR SYSTEMDI-69
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Revision: November 2009 2006 QX56
Symptom Chart EKS00BDA
SymptomRepair order
When the rear sonar system OFF switch is OFF, the indicator
lamp does not

REAR SONAR SYSTEMDI-69
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Symptom Chart EKS00BDA
SymptomRepair order
When the rear sonar system OFF switch is OFF, the indicator
lamp does not light and the buzzer does not sound. 1. Check rear sonar system OFF switch for malfunction. Refer to
DI-70, "
REAR SONAR SYSTEM OFF SWITCH" .
2. Check rear sonar system OFF switch ground circuit.
3. Check harness and connections between rear sonar system OFF switch and sonar control unit.
4. Replace sonar control unit. Refer to DI-70, "
SONAR CON-
TROL UNIT" .
When the rear sonar system OFF switch is OFF, the indicator
lamp does not light but buzzer sounds. 1. Check rear sonar system OFF indicator for malfunction. Refer
to DI-70, "
REAR SONAR SYSTEM OFF INDICATOR" .
2. Check harness and connections between rear sonar system OFF indicator and sonar control unit.
3. Replace sonar control unit. Refer to DI-70, "
SONAR CON-
TROL UNIT" .
When the rear sonar system OFF switch is OFF, the sonar
buzzer does not sound but indicator lamp illuminates. 1. Check sonar buzzer. Refer to
DI-70, "
SONAR BUZZER" .
2. Check harness and connections between sonar buzzer and sonar control unit.
3. Replace sonar control unit. Refer to: DI-70, "
SONAR CON-
TROL UNIT" .
When rear sonar system OFF switch is ON, the rear sonar sys-
tem OFF indicator lamp lights up and the sonar buzzer sounds
intermittently (for about 4 seconds). 1. Check harness between rear sonar sensors and sonar control
unit for an open condition.
2. Check rear sonar sensors for malfunction.
3. Replace sonar control unit. Refer to DI-70, "
SONAR CON-
TROL UNIT" .
The rear sonar system operates with the rear sonar system OFF
switch OFF. 1. Check rear sonar system OFF switch for malfunction. Refer to
DI-70, "
REAR SONAR SYSTEM OFF SWITCH" .
2. Check rear sonar system OFF switch ground circuit.
3. Check harness and connections between rear sonar system OFF switch and sonar control unit.
4. Replace sonar control unit. Refer to DI-70, "
SONAR CON-
TROL UNIT" .
When the transmission gear selector lever is in the R position
and the rear sonar system OFF switch is OFF, the sonar system
does not operate. 1. Check for PNP switch failure. Refer to
AT-86, "
SELF-DIAG-
NOSTIC RESULT MODE" .
2. Check harness and connections between sonar control unit and PNP/reverse lamp circuits.
3. Replace sonar control unit. Refer to DI-70, "
SONAR CON-
TROL UNIT" .
When the rear sonar system OFF switch is OFF, the indicator
lamp lights up and buzzer sounds although there is no obstacle
within the detection range. 1. Check for adhesion of snow, mud, or other foreign objects to
rear sonar sensors; dew condensation; etc. Refer to DI-66,
"Pre-diagnosis Inspection" .
2. Check that the rear sonar sensor is properly aligned (bumper is not misaligned, no deformation in sensor mounting area
3. Check harness and connections between rear sonar sensors and sonar control unit.
4. Check rear sonar sensors for malfunction.
5. Replace sonar control unit. Refer to DI-70, "
SONAR CON-
TROL UNIT" .
The rear sonar sensors do not operate according to the distance
between each sensor and the obstacle. (There is a large error in
the obstacle detection distance. 1. Check rear sonar sensors for malfunction.
2. Replace sonar control unit. Refer to
DI-70, "
SONAR CON-
TROL UNIT" .
3. Check for adhesion of snow, mud, or other foreign objects to rear sonar sensors; dew condensation; etc. Refer to DI-66,
"Pre-diagnosis Inspection" .
4. Check that the rear sonar sensor is properly aligned (bumper is not misaligned, no deformation in sensor mounting area

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INFINITI QX56 2006 Factory Service Manual DI-70
REAR SONAR SYSTEM
Revision: November 20092006 QX56
Component InspectionEKS00BDB
SONAR BUZZER
1. Disconnect the sonar buzzer connector.
2. Check continuity between buzzer terminal (1) and termina

Page 1192 of 3383

INFINITI QX56 2006 Factory Service Manual CLOCKDI-71
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Revision: November 2009 2006 QX56
CLOCKPFP:25820
Wiring Diagram — CLOCK —EKS00BDD
WKWA1178E

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