2008 INFINITI QX56 sensor

CHG-6
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and generator test segments must be done
as a set from start to finish.
1.PRELIMINARY INSPECTION
Perform the preliminary inspection. Refer to CHG-10, "
Inspection Procedure".
>> GO TO 2.
2.DISABLE THE POWER GENERATION VO LTAGE VARIABLE CONTROL SYSTEM
Disable the power generation voltage variable control with either of the following procedures.
• After selecting “ENGINE” on the “SELECT SYSTEM” screen of CONSULT-III, set the “ALTERNATOR DUTY” value to 0 % by selecting “ALTERNATOR DUTY” with “Active Test”. Continue “Active Test” until the end of
inspection. (When the DUTY value is 0 or 100 %, the normal power generation is performed according to the
characteristic of the IC regulator of the generator.)
• Turn the ignition switch OFF, disconnect the battery current sensor connector and leave it disconnected dur-
ing the course of the test.
NOTE:
Running the engine with the battery current sensor disconnected will cause DTC's (P1550-P1554) to set.
After finishing the inspection, connect the battery current sensor connector and erase the self-diagnostic
results history of the engine using CONSULT-III.
>> GO TO 3.
3.DIAGNOSIS WITH STARTING /CHARGING SYSTEM TESTER
Perform the charging system test using Starting/Charging System Test er (J-44373). For details and operating
instructions, refer to Technical Service Bulletin.
Te s t r e s u l t
CHARGING SYSTEM NOMAL>>Charging system is normal and will also show “DIODE RIPPLE” test result.
NO CHARGING VOLTAGE>>GO TO 4.
LOW CHARGING VOLTAGE>>GO TO 12.
HIGH CHARGING VOLTAGE>>GO TO 14.
DIODE RIPPLE NORMAL>>Diode ripple is OK and will also show “CHARGING VOLTAGE” test result.
EXCESS RIPPLE DETECTED>>Replace the generator. Perf orm “DIODE RIPPLE” test again using Starting/
Charging System Tester (J -44373) to confirm repair.
DIODE RIPPLE NOT DETECTED>>GO TO 4.
4.INSPECTION WITH CHARGE WARNING LAMP (IGNITION SWITCH IS ON)
Turn the ignition switch ON.
Does the charge warning lamp illuminate?
YES >> GO TO 6.
NO >> GO TO 5.
5.TERMINAL“2” (OPEN) CIRCUIT INSPECTION
Check terminal “2” circuit for open circuits. Refer to CHG-14, "
Diagnosis Procedure".
Is the terminal
“2” circuit normal?
YES >> Replace generator.
NO >> Repair as needed.
6.INSPECTION WITH CHARGE WARNING LAMP (IDLING)
Start the engine and run it at idle.
Does the charge warning lamp turn OFF?
YES >> GO TO 9.
NO >> GO TO 7.
7.TERMINAL “2”(SHORT) CIRCUIT INSPECTION
Check terminal “2” circuit for short to ground. Refer to CHG-14, "
Diagnosis Procedure".
Is the terminal
“2” circuit normal?
Revision: March 2010 2008 QX56

CHG
POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM
CHG-9
< FUNCTION DIAGNOSIS >
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POWER GENERATION VOLTAG
E VARIABLE CONTROL SYSTEM
System DiagramINFOID:0000000001696181
System DescriptionINFOID:0000000001696182
Power generation variable voltage control system has been adopted. By varying the voltage to the generator,
engine load due to power generation of the generator is reduced and fuel consumption is decreased.
NOTE:
When any malfunction is detected in the power generat ion variable voltage control system, power generation
is performed according to the characterist ic of the IC regulator in the generator.
Component DescriptionINFOID:0000000001696183
ALMIA0057GB
Component part Description
Battery current sensor The battery current sensor is installed on the battery cable at the
negative terminal. The battery current sensor detects the charg-
ing/discharging current of the battery and sends a voltage signal
to the ECM according to the current value detected.
ECM The battery current sensor detects the charging/discharging cur-
rent of the battery. The ECM judges the battery condition based on
this signal.
The ECM judges whether to request more output via the power
generation voltage variable control according to the battery condi-
tion.
When performing the power generation voltage variable control,
the ECM calculates the target power generation voltage according
to the battery condition and sends the calculated value as the pow-
er generation command value to the IPDM E/R.
IPDM E/R The IPDM E/R converts the received power generation command
value into a pulse width modulated (PWM) command signal and
sends it to the IC regulator.
Generator (IC regulator) The IC regulator controls the power generation voltage by the tar-
get power generation voltage based on the received PWM com-
mand signal.
When there is no PWM command signal, the generator performs
the normal power generation according to the characteristic of the
IC regulator.
Revision: March 2010
2008 QX56

CO-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004857577
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:0000000004857586
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

PRECAUTIONSDEF-31
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004894308
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty 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 inoper ative, 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 unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied 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 Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric 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 minutes before performing any service.
Precaution Necessary for Steering Wheel Rotation After Battery Disconnect
INFOID:0000000004894309
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 disconnecti ng 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 power 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

DLK-2
Component Description ..........................................47
DIAGNOSIS SYSTEM (BCM) ............................48
COMMON ITEM ..................................................... ...48
COMMON ITEM : CONSULT-III Function (BCM -
COMMON ITEM) ................................................. ...
48
DOOR LOCK .......................................................... ...48
DOOR LOCK : CONSULT-III Function (BCM -
DOOR LOCK) .........................................................
48
MULTIREMOTE ENT ............................................. ...49
MULTIREMOTE ENT : CONSULT-III Function
(BCM - MULTIREMOTE ENT) ................................
49
INTELLIGENT KEY ................................................ ...51
INTELLIGENT KEY : CONSULT-III Function
(BCM - INTELLIGENT KEY) ...................................
51
DIAGNOSIS SYSTEM (INTELLIGENT KEY
UNIT) ............................................................... ...
52
CONSULT-III Function (INTELLIGENT KEY) ...... ...52
COMPONENT DIAGNOSIS ........................54
U1000 CAN COMM CIRCUIT ......................... ...54
Description ........................................................... ...54
DTC Logic ...............................................................54
Diagnosis Procedure ..............................................54
U1010 CONTROL UNIT (CAN) .........................55
DTC Logic ............................................................ ...55
Diagnosis Procedure ..............................................55
Special Repair Requirement ...................................55
INSIDE KEY ANTENNA 1 (REAR OF CEN-
TER CONSOLE) ............................................. ...
56
Description ........................................................... ...56
Component Function Check .................................56
Diagnosis Procedure ..............................................56
INSIDE KEY ANTENNA 2 (LUGGAGE COM-
PARTMENT) ......................................................
58
Description ........................................................... ...58
Component Function Check .................................58
Diagnosis Procedure ..............................................58
INSIDE KEY ANTENNA 3 (FRONT OF CEN-
TER CONSOLE) ................................................
60
Description ........................................................... ...60
Component Function Check .................................60
Diagnosis Procedure ..............................................60
INSIDE KEY ANTENNA 4 (OVERHEAD CON-
SOLE AREA) .....................................................
62
Description ........................................................... ...62
Component Function Check .................................62
Diagnosis Procedure ..............................................62
POWER SUPPLY AND GROUND CIRCUIT .....64
INTELLIGENT KEY UNIT ....................................... ...64
INTELLIGENT KEY UNIT : Diagnosis Procedure ...64
BCM (BODY CONTROL MODULE) ..........................64
BCM (BODY CONTROL MODULE) : Diagnosis
Procedure ...............................................................
64
BACK DOOR .......................................................... ...65
BACK DOOR : Diagnosis Procedure ......................65
DOOR SWITCH .................................................67
Description ........................................................... ...67
Component Function Check ..................................67
Diagnosis Procedure ...............................................67
DOOR LOCK AND UNLOCK SWITCH .............70
DRIVER SIDE ......................................................... ...70
DRIVER SIDE : Description ....................................70
DRIVER SIDE : Component Function Check ........70
DRIVER SIDE : Diagnosis Procedure .....................70
PASSENGER SIDE ...................................................72
PASSENGER SIDE : Descripti on ...........................72
PASSENGER SIDE :
Component Function Check ............................... ...
72
PASSENGER SIDE : Diagnosis Procedure ............72
KEY CYLINDER SWITCH .................................75
Description ........................................................... ...75
Component Function Check ...................................75
Diagnosis Procedure ...............................................75
FRONT DOOR LOCK ACTUATOR LH (DOOR
UNLOCK SENSOR) ..........................................
77
Description ........................................................... ...77
Component Function Check ..................................77
Diagnosis Procedure ...............................................77
Component Inspection ............................................78
DOOR REQUEST SWITCH ...............................79
Description ..............................................................79
Component Function Check ..................................79
Diagnosis Procedure ...............................................79
Component Inspection ............................................80
DOOR LOCK ACTUATOR ................................82
DRIVER SIDE ......................................................... ...82
DRIVER SIDE : Description ....................................82
DRIVER SIDE : Component Function Check ........82
DRIVER SIDE : Diagnosis Procedure .....................82
PASSENGER SIDE ...................................................83
PASSENGER SIDE : Descripti on ...........................83
PASSENGER SIDE :
Component Function Check ............................... ...
83
PASSENGER SIDE : Diagnosis Procedure ............83
REAR LH ................................................................ ...84
REAR LH : Description ...........................................84
REAR LH : Component Function Check ............ ...84
Revision: March 2010 2008 QX56

DLK-16
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
DOOR LOCK FUNCTION
ALKIA0579ZZ
1. Horn E3
(view with hood open) 2. IPDM E/R E122, E124
(view with cover removed) 3. Horn relay H-1
4. Remote keyless entry receiver M25 (view with instrume nt panel RH removed) 5. Intelligent key warning buzzer E25 6. Combination meter M23, M24
7. Intelligent Key unit M70 (view with instrument panel LH removed) 8. BCM M18, M19, M20
(view with instrument panel LH removed) 9. Steering lock solenoid M15
(view with steering column removed)
10. Key switch and ignition knob switch M12 11. A/T shift selector (park position switch) M203
(view with center console removed)12. Inside key antenna 3 (front of center
console) M210
(view with center console removed)
13. Inside key antenna 1 (rear of center con- sole) M209 14. Inside key antenna 4 (overhead console
area) R210
(view with overhead console removed) 15. Inside key antenna 2 (luggage com-
partment) B76
(view with rear carpet removed)
16. Rear bumper antenna C7 (view with rear bumper removed) 17. Back door latch D503
18. Front outside antenna LH D15
Front outside antenna RH D115
19. Front door request switch LH D16 Front door request switch RH D116 20. Front door lock assembly LH (door un-
lock sensor) D14 21. Front door switch LH B8
RH B108
22. Rear door switch LH B18 RH B116
Revision: March 2010 2008 QX56

DOOR LOCK FUNCTIONDLK-21
< FUNCTION DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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INTELLIGENT KEY : Co mponent DescriptionINFOID:0000000001538917
ALKIA0579ZZ
1. Horn E3
(view with hood open) 2. IPDM E/R E122, E124
(view with co ver removed) 3. Horn relay H-1
4. Remote keyless entry receiver M25 (view with instrume nt panel RH removed) 5. Intelligent key warning buzzer E25 6. Combination meter M23, M24
7. Intelligent Key unit M70 (view with instrument panel LH removed) 8. BCM M18, M19, M20
(view with instrument panel LH removed) 9. Steering lock solenoid M15
(view with steering column removed)
10. Key switch and ignition knob switch M12 11. A/T shift selector (park position switch) M203
(view with center console removed)12. Inside key antenna 3 (front of center
console) M210
(view with center console removed)
13. Inside key antenna 1 (rear of center con- sole) M209 14. Inside key antenna 4 (overhead console
area) R210
(view with overhead console removed) 15. Inside key antenna 2 (luggage com-
partment) B76
(view with rear carpet removed)
16. Rear bumper antenna C7 (view with rear bumper removed) 17. Back door latch D503
18. Front outside antenna LH D15
Front outside antenna RH D115
19. Front door request switch LH D16 Front door request switch RH D116 20. Front door lock assembly LH (door un-
lock sensor) D14 21. Front door switch LH B8
RH B108
22. Rear door switch LH B18 RH B116
Revision: March 2010 2008 QX56

DLK-32
< FUNCTION DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
BACK DOOR OPENER FUNCTION
INTELLIGENT KEY : Component Description
INFOID:0000000001538925
ALKIA0579ZZ
1. Horn E3 (view with hood open) 2. IPDM E/R E122, E124
(view with cover removed) 3. Horn relay H-1
4. Remote keyless entry receiver M25 (view with instrume nt panel RH removed) 5. Intelligent key warning buzzer E25 6. Combination meter M23, M24
7. Intelligent Key unit M70 (view with instrument panel LH removed) 8. BCM M18, M19, M20
(view with instrument panel LH removed) 9. Steering lock solenoid M15
(view with steering column removed)
10. Key switch and ignition knob switch M12 11. A/T shift selector (park position switch) M203
(view with center console removed)12. Inside key antenna 3 (front of center
console) M210
(view with center console removed)
13. Inside key antenna 1 (rear of center con- sole) M209 14. Inside key antenna 4 (overhead console
area) R210
(view with overhead console removed) 15. Inside key antenna 2 (luggage com-
partment) B76
(view with rear carpet removed)
16. Rear bumper antenna C7 (view with rear bumper removed) 17. Back door latch D503
18. Front outside antenna LH D15
Front outside antenna RH D115
19. Front door request switch LH D16 Front door request switch RH D116 20. Front door lock assembly LH (door un-
lock sensor) D14 21. Front door switch LH B8
RH B108
22. Rear door switch LH B18 RH B116
Revision: March 2010 2008 QX56