Relay INFINITI QX56 2009 Factory Service Manual

SN-6
< FUNCTION DIAGNOSIS >
REAR SONAR SYSTEM
FUNCTION DIAGNOSIS
REAR SONAR SYSTEM
System DiagramINFOID:0000000004173795
System DescriptionINFOID:0000000004173796
FUNCTION
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 sonar system OFF indicator lamp will be illuminated in the rear 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 rear sonar system OFF s witch again will enable the rear sonar system also.
Enabling the rear sonar system will cause the rear sonar system OFF indicator to go out. If the indicator light
is blinking there is a malfunction in the system.
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 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.
AWNIA1499GB
Revision: December 20092009 QX56

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REAR SONAR SYSTEMSN-7
< FUNCTION DIAGNOSIS >
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Component Parts LocationINFOID:0000000004173797
Component DescriptionINFOID:0000000004173798
Self-Diagnosis FunctionINFOID:0000000004173799
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 B24
(view with luggage side finisher LH removed) 2. Back-up lamp relay M73 3. A/T assembly F9
4. Sonar buzzer M47 5. Rear sonar system OFF switch
M117
(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
AWNIA1588ZZ
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
Sonar buzzer Sounds a signal when objects are detected in the rear of the vehicle
Rear 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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FRONT AND REAR SONAR SYSTEMSN-11
< FUNCTION DIAGNOSIS >
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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:0000000003776746
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
Revision: December 20092009 QX56

SN-12
< FUNCTION DIAGNOSIS >
FRONT AND REAR SONAR SYSTEM
Component Description
INFOID:0000000003776747
CONSULT-III Function (SONAR)INFOID:0000000003776748
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.
Revision: December 20092009 QX56

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SONAR SYSTEM SYMPTOMSSN-45
< SYMPTOM DIAGNOSIS >
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SYMPTOM DIAGNOSIS
SONAR SYSTEM SYMPTOMS
Symptom TableINFOID:0000000003776759
Symptom Repair order
When the sonar system is OFF, the OFF indicator does not light
and the sonar buzzer does not sound. 1. Check sonar system OFF switch. Refer to
SN-20, "
Compo-
nent Inspection" or SN-19, "Diagnosis Procedure (With
Front and Rear Sonar System)".
2. Check harness and connections for sonar system OFF
switch.
3. Replace sonar control unit. Refer to SN-50, "
Removal and
Installation".
When the sonar system is OFF, the OFF indicator lamp does not
light but the sonar buzzer does sound. 1. Check sonar system OFF switch. Refer to
SN-19, "
Diagno-
sis Procedure (With Rear Sonar System)" or SN-19, "Diag-
nosis Procedure (With Front and Rear Sonar System)".
2. Check harness and connections for sonar system OFF indi- cator lamp.
3. Replace sonar control unit.
When the sonar system is OFF, the sonar buzzer does not sound
but the OFF indicator lamp lights. 1. Check sonar buzzer. Refer to
SN-18, "
Component Inspec-
tion" or SN-17, "Diagnosis Procedure (With Front and Rear
Sonar System)".
2. Check harness and connections between sonar buzzer and sonar control unit.
3. Replace sonar control unit.
When sonar system is ON, the sonar system OFF indicator lamp
lights up and the sonar buzzer sounds intermittently (for about 4
seconds). (Rear sonar system only) 1. Check harnesses between sonar sensors and sonar control
unit for an open condition.
2. Check sonar sensors. Refer to SN-5, "
Preliminary Check".
3. Replace sonar control unit.
The sonar system still operates when the sonar system is OFF. 1. Replace sonar control unit.
When the transmission gear selector lever is in the R position and
the sonar system is ON, the rear sonar system does not operate. 1. Check transmission range switch. Refer to
TM-44, "
Diagno-
sis Procedure".
2. Check back-up lamp relay.
3. Check related harness and connections for back-up lamp re- lay.
4. Replace sonar control unit.
When the transmission gear selector lever is in a forward drive
gear and the sonar system is ON, the front sonar system does not
operate. (With front and rear sonar system only) 1. Check harness and connections between sonar control unit
and combination meter.
2. Replace sonar control unit.
Sonar system OFF indicator lamp lights up and buzzer sounds al-
though there are no obstacles within the detection range. 1. Check sonar sensors.
2. Check harness and connections between sonar sensors
and sonar control unit.
3. Replace sonar control unit.
The sonar sensors do not detect objects in the detectable range. 1. Check sonar sensors.
2. Replace sonar control unit.
Revision: December 20092009 QX56

HEATED STEERING WHEELST-7
< FUNCTION DIAGNOSIS >
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FUNCTION DIAGNOSIS
HEATED STEERING WHEEL
System DiagramINFOID:0000000003775119
System DescriptionINFOID:0000000003775120
The heated steering wheel switch controls the heated steeri ng relay. When the switch is turned on, the relay is
energized and the heated steering system will operate. T he heated steering system will turn off when the
steering wheel temperature reaches approximately 30 ° C (86 ° F). Heated steering system operation can also
be canceled by pressing the heated steering wheel switch again.
NOTE:
If the surface temperature of the steering wheel is below 68 ° F (20 ° C), the system will heat the steering wheel
and cycle off and on to maintain a temperature above 68 ° F (20 ° C). The indicator light will remain on as long
as the system is on. Push the switch again to turn the heated steering wheel system off manually. The indica-
tor light will go off.
Component Parts LocationINFOID:0000000003775121
AWGIA0022GB
1. Heated steering relay M71 2. Combination switch (spiral cable) M52 3. Heated steering wheel M114
4. Heated steering wheel switch M260
ALGIA0030ZZ
Revision: December 20092009 QX56

ST-8
< FUNCTION DIAGNOSIS >
HEATED STEERING WHEEL
Component Description
INFOID:0000000003775122
Heated steering wheel switch  Controls the heated steering relay and operates the heated steering system.
 Turns the indicator lamp ON when the system is activated.
Heated steering relay  Operates the heated steering system with the control signal from the heated steering
wheel switch.
Heated steering wheel  Heats the heating element with the power supplied from the heated steering relay.
Revision: December 20092009 QX56

STARTING SYSTEMSTR-9
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Component DescriptionINFOID:0000000003771791
Component part
Description
TCM TCM supplies power to the starter relay inside the IPDM E/R when
the selector lever is shifted to the P or N position.
BCM BCM sends a starter request signal to the CPU of the IPDM E/R
over the CAN communication lines.
IPDM E/R CPU inside IPDM E/R operates the starter relay at the request of
the BCM over the CAN communication lines.
Starter motor The starter motor plunger closes and the motor is supplied with
battery power, which in turn cranks the engine, when the “S” ter-
minal is supplied with electric power.
Revision: December 20092009 QX56

TM-1
TRANSMISSION & DRIVELINE
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CONTENTS
TRANSAXLE & TRANSMISSION
BASIC INSPECTION ....... .............................5
DIAGNOSIS AND REPAIR WORKFLOW ..... .....5
Work Flow ........................................................... ......5
Diagnostic Work Sheet ..............................................6
FUNCTION DIAGNOSIS ...............................8
A/T CONTROL SYSTEM ................................ .....8
Cross-Sectional View (2WD models) .................. ......8
Cross-Sectional View (4WD models) ........................9
Shift Mechanism ........................................................9
TCM Function ..........................................................20
CAN Communication ...............................................21
Input/Output Signal of TCM .....................................22
Line Pressure Control .............................................22
Shift Control ............................................................24
Lock-up Control .......................................................25
Engine Brake Control ..............................................26
Control Valve ...........................................................26
Component Parts Location ......................................28
A/T SHIFT LOCK SYSTEM ............................ ....29
System Description ............................................. ....29
Component Parts Location ......................................29
ON BOARD DIAGNOSTIC (OBD) SYSTEM ......30
Introduction ......................................................... ....30
OBD-II Function for A/T System ..............................30
One or Two Trip Detection Logic of OBD-II ............30
OBD-II Diagnostic Trouble Code (DTC) ..................30
Malfunction Indicator Lamp (MIL) ............................31
DIAGNOSIS SYSTEM (TCM) .............................32
CONSULT-III Function (TRANSMISSION) ......... ....32
Diagnosis Procedure without CONSULT-III ............37
COMPONENT DIAGNOSIS .........................39
U1000 CAN COMM CIRCUIT ......................... ....39
Description .......................................................... ....39
On Board Diagnosis Logic ......................................39
Possible Cause .................................................... ....39
DTC Confirmation Procedure ..................................39
Diagnosis Procedure ...............................................39
P0615 STARTER RELAY .................................40
Description ...............................................................40
CONSULT-III Reference Value in Data Monitor
Mode ........................................................................
40
On Board Diagnosis Logic .......................................40
Possible Cause ........................................................40
DTC Confirmation Procedure ..................................40
Diagnosis Procedure ...............................................40
P0700 TRANSMISSION CONTROL .................43
Description ...............................................................43
On Board Diagnosis Logic .......................................43
Possible Cause ........................................................43
DTC Confirmation Procedure ..................................43
Diagnosis Procedure ...............................................43
P0705 TRANSMISSION RANGE SWITCH A ...44
Description ...............................................................44
CONSULT-III Reference Value in Data Monitor
Mode ........................................................................
44
On Board Diagnosis Logic .......................................44
Possible Cause ........................................................44
DTC Confirmation Procedure ..................................44
Diagnosis Procedure ...............................................44
P0717 INPUT SPEED SENSOR A ....................47
Description ...............................................................47
CONSULT-III Reference Value in Data Monitor
Mode ........................................................................
47
On Board Diagnosis Logic .......................................47
Possible Cause ........................................................47
DTC Confirmation Procedure ..................................47
Diagnosis Procedure ...............................................47
P0720 OUTPUT SPEED SENSOR ...................49
Description ...............................................................49
CONSULT-III Reference Value in Data Monitor
Mode ........................................................................
49
Revision: December 20092009 QX56

A/T CONTROL SYSTEMTM-21
< FUNCTION DIAGNOSIS >
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CONTROL SYSTEM DIAGRAM
CAN CommunicationINFOID:0000000003771809
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication li ne for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. For details, refer to LAN-4,
"System Description".
SENSORS (or SIGNALS)
⇒TCM
⇒ACTUATORS
Transmission range switch
Accelerator pedal position sensor
Closed throttle position signal
Wide open throttle position signal
Engine speed signal
A/T fluid temperature sensor
Output speed sensor
Vehicle speed signal
Stop lamp switch signal
Input speed sensor
1st position switch signal
4th position switch signal
ATF pressure switch 2 signal
Tow mode switch signal Shift control
Line pressure control
Lock-up control
Engine brake control
Timing control
Fail-safe control
Self-diagnosis
CONSULT-III co
mmunication
line
Duet-EA control
CAN system Input clutch solenoid valve
Direct clutch solenoid valve
Front brake solenoid valve
High and low reverse clutch sole-
noid valve
Low coast brake solenoid valve
Torque converter clutch solenoid
valve
Line pressure solenoid valve
A/T CHECK indicator lamp
Starter relay
Back-up lamp relay
JSDIA1315GB
Revision: December 20092009 QX56