INFINITI QX56 2008 Factory Service Manual

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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.
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REAR SONAR SYSTEMSN-7
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Component Parts LocationINFOID:0000000001754058
Component DescriptionINFOID:0000000001754059
Self-Diagnosis FunctionINFOID:0000000001754060
There are four modes of self-diagnosis. Thes e modes must be followed in the following order:
1. Entering diagnostics mode
2. Requesting number of fault codes mode
3. Requesting fault codes mode
4. Clearing fault codes mode
Self-diagnosis can be manually exited by turning the igni tion OFF or selecting reverse gear. Self-diagnosis will
exit unless a fault code request occurs before a me ssage is repeated five times without acknowledgement.
ENTERING DIAGNOSTICS MODE
1. Sonar control unit B56
(view with luggage side finisher LH removed) 2. Back-up lamp relay M73 3. A/T assembly F9
4. Rear sonar buzzer M117 5. Sonar system OFF switch M116
(with sonar system OFF indicator) 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
ALNIA0374ZZ
Component Function
Sonar control unit Controls sonar system and provides self-diagnosis
Back-up lamp relay Provides reverse signal for sonar control unit
A/T assembly Controls back-up lamp relay
Rear sonar buzzer Sounds a signal when objects are detected in the rear of the vehicle
Sonar system OFF switch Enables the driver to turn system off and signals a system malfunction
Sonar sensor Senses objects in the rear of the vehicle
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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
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REAR SONAR SYSTEMSN-9
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1. Push and hold sonar system OFF switch for three seconds to reset time-out counter.
2. Push and hold sonar system OFF switch for three seconds to clear codes.
LKIA0391E
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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
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FRONT AND REAR SONAR SYSTEMSN-11
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sonar sensors measure the time from the transmitted si gnal to the time the signal is reflected back and send
this information to the sonar control unit.
FRONT SONAR SENSORS
With power and ground supplied to the front 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 front
sonar sensors measure the time from the transmitted si gnal to the time the signal is reflected back and send
this information to the sonar control unit.
COMBINATION METER
The combination meter provides the vehicle speed and park signals to the sonar control unit.
Component Parts LocationINFOID:0000000004709645
Front
1. Sonar control unit B56, B57 (View with luggage side finisher LH removed) 2. Back-up lamp relay M73 3. A/T assembly F9
4. Front sonar buzzer M118 5. Sonar system OFF switch M116
(with sonar system OFF indicator) 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. Front sonar sensor RH outer E166 11. Front sonar sensor RH inner E163 12. Front sonar sensor LH inner E162
13. Front sonar sensor LH outer E158 14. Combination meter M23, M24 15. Rear sonar buzzer B166
(View with back door open)
AWNIA1853ZZ
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< FUNCTION DIAGNOSIS >
FRONT AND REAR SONAR SYSTEM
Component Description
INFOID:0000000001754064
CONSULT-III Function (SONAR)INFOID:0000000001754065
SELF DIAGNOSTIC PROCEDURE
CONSULT-III can be used to read and clear DTCs. Refer to GI-46, "Description".
SELF DIAGNOSTIC RESULTS
Refer to SN-44, "DTC Index".
Component Function
Sonar control unit Controls sonar system and provides self-diagnosis
Back-up lamp relay Provides reverse signal for sonar control unit
A/T assembly Controls back-up lamp relay
Front sonar buzzer Sounds a signal when objects are detected in the front of the vehicle
Rear sonar buzzer Sounds a signal when objects are detected in the rear of the vehicle
Sonar system OFF switch Enables the driver to turn the system off and signals a system malfunction
Front sonar sensors Senses objects in the front of the vehicle
Rear sonar sensors Senses objects in the rear of the vehicle
Combination meter Provides Park and vehicle speed signals for sonar control unit
Diagnosis mode Description
SELF-DIAG RESULTS Displays sonar control unit self-diagnosis results.
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POWER SUPPLY AND GROUND CIRCUITSN-13
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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
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< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
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 B56.
2. Turn ignition switch ON.
3. Check voltage between sonar control unit connector B56 termi- nal 1 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 4 and ground.
Is there continuity?
YES >> Inspection End.
NO >> Check harness ground circuit.
Unit Power Source FuseLocation
Sonar control unit ON or START 12
Fuse block (J/B)
51 IPDM E/R
Te r m i n a l s
Vo l ta g e
(+)
(-)
Connector Terminal
B56 1 Ground Battery voltage
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Te r m i n a l s
Continuity
(+)
(–)
Connector Terminal
B56 4Ground Yes
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SONAR SENSOR CIRCUIT INSPECTIONSN-15
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SONAR SENSOR CIRCUIT INSPECTION
DescriptionINFOID:0000000004832343
With power and ground supplied to the sonar sensors, the sonar sensors transmit an ultrasonic signal. This
signal is reflected back to the sensor by objec ts large enough and close enough to be detected. The sonar
sensors measure the time from the transmitted signal to the time the signal is reflected back and send this
information to the sonar control unit.
Diagnosis Procedure (With Rear Sonar System)INFOID:0000000004832344
1.CHECK REAR SONAR SENSOR CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect sonar control unit connector and rear sonar sensor connectors.
3. Check continuity between sonar control unit harness connector (A) and rear sonar sensor harness connectors (B).
4. Check continuity between sonar control unit harness connector and ground.
Are the inspection results normal?
YES >> Inspection End.
NO >> Repair harness or connector.
Diagnosis Procedure (With Front and Rear Sonar System)INFOID:0000000004832345
1.CHECK SONAR SENSOR CIRCUITS
1. Turn ignition switch OFF.
2. Disconnect sonar control unit connec tors and sonar sensor connectors.
3. Check continuity between sonar control unit harness connectors (A, B) and sonar sensor harness connectors (C).
Connector Terminal ConnectorTerminal Continuity
B56 (A) 16
C102, C103, C104, C105 (B) 1
Ye s
15 3
9, 10, 11, 12 2
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ConnectorTerminalContinuity
B56 9, 10, 11, 12, 15, 16 Ground No
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Connector TerminalConnectorTerminal Continuity
B56 (A) 9
C102, C103, C104, C105 (C) 1
Ye s
12
3
13, 14, 15, 16 2
B57 (B) 17
E158, E162, E1 63, E166 (C) 1
26 3
19, 20, 24, 25 2
AWNIA1877ZZ
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