2011 INFINITI QX56 air condition

REAR SHOCK ABSORBERRSU-11
< REMOVAL AND INSTALLATION >
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Inadvertent piping removal causes fluid to splatter.
2. Remove tires with power tool. Refer to WT-64, "
Removal and Installation".
3. Remove height sensor from rear lower link (right side). Refer to EXL-136, "
Removal and Installation".
4. Remove vehicle height sensor from rear lower link (left side). Refer to SCS-98, "
Removal and Installa-
tion".
5. Remove air tube from shock absorber assembly. Refer to SCS-95, "
Removal and Installation".
6. Remove middle tube assembly from shock absorber assembly. (With HBMC) Refer to SCS-44, "
REAR
TUBE ASSEMBLY : Removal and Installation".
7. Remove shock absorber mounting bolt (lower side).
8. Remove piston rod lock nut.
9. Remove bracket, bushings, and shock absorber. (With HBMC)
10. Remove washers, bushings, and shock absorber. (Without HBMC)
11. Perform inspection after removal. Refer to RSU-11, "
Inspection and Adjustment".
INSTALLATION
Note the following, and install in the reverse order of removal.
 When installing the bracket (1), check that bracket is attached as
shown in the figure. (With HBMC)
 Use the holder (A) [SST: KV10109300 ( −)] and a suitable tool
(B) to tighten piston rod lock nut so that the bracket does not
become misaligned. (With HBMC)
 Install air tube to shock absorber assembly. Refer to SCS-95,
"Removal and Installation".
 Perform final tightening of bolts and nuts at the shock absorber
lower side (rubber bushing), under unladen conditions with tires on
level ground.
 Perform inspection after installation. Refer to RSU-11, "
Inspection
and Adjustment".
 After replacing the shock absorber, always follow the disposal pro- cedure to discard the shock absorber. Refer to RSU-12, "
Dis-
posal".
Inspection and AdjustmentINFOID:0000000006225668
INSPECTION AFTER REMOVAL
Check the following items, and replace the parts if necessary.
 Shock absorber assembly for deformation, cracks, damage.
 Piston rod on shock absorber assembly for damage, uneven wear, and distortion.
 Welded and sealed areas for oil leakage.
INSPECTION AFTER INSTALLATION
1. Check wheel alignment. Refer to RSU-6, "Inspection".
2. Adjust neutral position of steering angle sensor. Refer to BRC-64, "
Work Procedure".
3. Adjust levelizer adjustment of height sensor. Refer to EXL-61, "
LEVELIZER ADJUSTMENT : Special
Repair Requirement".
4. Check standard vehicle height setting of vehicle height sensor. Refer to SCS-67, "
Work Procedure".
ADJUSTMENT AFTER INSTALLATION (WITH HBMC)
: Vehicle front
A : Frame edge line
B: Almost parallel
JPEIB0232ZZ
JPEIB0220ZZ
Revision: 2010 May2011 QX56

REAR SUSPENSION MEMBERRSU-19
< UNIT REMOVAL AND INSTALLATION >
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16. Remove final drive. Refer to DLN-201, "Removal and Installation".
17. Remove rear tube assembly A and rear tube assembly B. (With HBMC) Refer to SCS-44, "
REAR TUBE
ASSEMBLY : Removal and Installation".
18. Set suitable jack under rear suspension member.
19. Slowly lower jack, then remove rear suspension member, suspension arm, front lower link, wheel hub and housing from vehicle as a unit.
20. Remove mounting bolts and nuts, then remove suspension arm, front lower link, wheel hub and housing from rear suspension member.
21. Perform inspection after removal. Refer to RSU-19, "
Inspection and Adjustment".
INSTALLATION
Note the following, and install in the reverse order of the removal.
 Perform the final tightening of each of parts under unladen conditions, which were removed when removing
rear suspension assembly.
 Perform inspection after installation. Refer to RSU-19, "
Inspection and Adjustment".
 Perform adjustment after installation. (With HBMC) Refer to RSU-19, "
Inspection and Adjustment".
Inspection and AdjustmentINFOID:0000000006225678
INSPECTION AFTER REMOVAL
Check rear suspension member for deformation, cracks, or any other damage. Replace if necessary.
INSPECTION AFTER INSTALLATION
1. Adjust parking brake operation (stroke). Refer to PB-3, "Inspection and Adjustment".
2. Check wheel alignment. Refer to RSU-6, "
Inspection".
3. Adjust neutral position of steering angle sensor. Refer to BRC-64, "
Work Procedure".
4. Adjust levelizer adjustment of height sensor. Refer to EXL-61, "
LEVELIZER ADJUSTMENT : Special
Repair Requirement".
5. Check standard vehicle height setting of vehicle height sensor. Refer to SCS-67, "
Work Procedure".
6. Check wheel sensor harness for proper connection. Refer to BRC-135, "
REAR WHEEL SENSOR :
Exploded View"
ADJUSTMENT AFTER INSTALLATION (WITH HBMC)
Bleed air from the HBMC. Refer to SCS-18, "Work Procedure".
Revision: 2010 May2011 QX56

SBC-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Component Description
INFOID:0000000006237876
A. View with instrument driver lower cov- er removed B. Combination switch C. View with center pillar lower garnish
removed (driver side)
D. View with center pillar lower garnish re- moved (passenger side)
Component Function
ABS actuator and electric unit (control unit) ABS operation signal is rece
ived from ABS actuator and el ectric unit (control unit)
via CAN communication.
ADAS control unit Intelligent brake assistance operation signal is received from ADAS control unit
via CAN communication.
Air bag diagnosis sensor unit  Detects a collision and supplies power supply for deployment to air bag module
and pre-tensioner seat belt.
 Performs the deploy judgement of passenger air bag based on the information from Occupant Detection System control unit
BCM Ignition ON signal, sleep/wake up signal, and door switch signal are received
from BCM via CAN communication.
Brake pedal stroke sensor  It changes voltage according to brake pedal depressed amount and sends the
signal to pre-crash seat belt control unit.
 There are 2 signals (brake pedal stroke sensor 1 and 2) sent from the brake
pedal stroke sensor. Pre-crash seat belt control unit judges the stroke amount
and the speed of the brake pedal according to the voltage of the signal sent by
each side.
Combination meter  Transmits vehicle speed signal to pre-crash seat belt control unit (driver side).
 Turns the seat belt warning lamp ON when the seat belt is unfastened.
Occupant detection system control unit Judges the passenger seat condition based on the information from occupant de-
tection unit.
Pre-crush seat belt control unit (driver side)  Total control of pre-crash seat belt system is operated according to transmit sig-
nal.
 Driver seat belt retractor integrates pre-crash seat belt control unit (driver side), driver seat belt motor, and tension reducer.
 Seat belt motor operates each operation of pull, return, and hold.
Pre-crush seat belt control unit (passenger side)  Control of passenger pre-crash seat belt is operated according to transmit sig-
nal.
 Passenger seat belt retractor integrates pre-crash seat belt control unit (driver seat), driver seat belt motor, and tension reducer.
 Seat belt motor operates each operation of pull, return, and hold.
Seat belt buckle switch (driver side)  Fastening or not fastening of seat belt is judged. This judgment is used for con-
trol of driver pre-crash seat belt system.
 Seat belt warning lamp on combination meter turns ON when seat belt is not fastened while ignition switch is ON.
 The seat belt buckle switch is installed in the seat belt buckle.
Seat belt buckle switch (passenger side)  Fastening or not fastening of seat belt is judged. This judgment is used to con-
trol passenger pre-crash seat belt system.
 The seat belt buckle switch is installed in the seat belt buckle.
Steering angle sensor Steering angle sensor signal, steering angle speed signal, steering angle sensor
neutral position adjustment completion signal, and steering angle sensor mal-
function signal are received via CAN communication.
Revision: 2010 May2011 QX56

SYSTEMSBC-7
< SYSTEM DESCRIPTION >
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SYSTEM
PRE-CRASH SEAT BELT SYSTEM
PRE-CRASH SEAT BELT SYSTEM : System DiagramINFOID:0000000006237877
PRE-CRASH SEAT BELT SYSTEM : System DescriptionINFOID:0000000006237878
 Pre-crash seat belt system integrates control unit and motor in driver and passenger seat belt retractors.
 Provides a sense of ease when pre-crash seat belt c ontrol unit judges the emergency braking operation, the
intelligent brake assistance operating status, the c ontinuous ABS operating status, the emergency steering
wheel operation, the excessive vehicle inclination stat us, or the lateral slippage status during cornering.
The motor immediately retracts the seat belt and suppresses change in occupant posture.
 Even in a situation where a collision is unavoidable, effe cts of other safety devices, like the air bag, are max-
imized and damages are reduced.
 Motor retracts seat belt when unfastening and extrac ts seat belt when fastening to reduce the feeling of
pressure. (comfort function)
FUNCTION DESCRIPTION
Pre-crash seat belt system operat es under the following conditions.
 During emergency brake operation
 When ABS continuously operates
 When intelligent brake assistance operates
 When lateral slippage during cornering occurs
 When steering wheel is rotated for emergency
JMHIA1565GB
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (PRE-CRASH SEAT BELT)SBC-11
< SYSTEM DESCRIPTION >
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DIAGNOSIS SYSTEM (P RE-CRASH SEAT BELT)
CONSULT-III FunctionINFOID:0000000006237882
Diagnosis for pre-crash seat belt syst em can be performed using CONSULT-III.
APPLICATION ITEM
SELF-DIAGNOSIS RESULTS
Refer to SBC-16, "DTC Index".
CAUTION:
When malfunctions are detect ed in several systems, includin g CAN communication [U1000], trouble-
shoot CAN communication [U1000].
A malfunction of system may be disp layed when battery voltage is low (when 7 to 8 V is continued for
approximately 2 seconds) even though the system is not malfunctioning. Erase DTC memory and
never replace any parts after making sure that the syst em is normal, especially if the malfunctions are
displayed after replacing battery.
ERASING SELF-DIAGNOSIS RESULTS
 SELF-DIAGNOSIS RESULTS Current “SELF-DIAG RESULTS” are displayed. (If all suspect circuits have been repaired, “NO DTC” is dis-
played.)
DATA MONITOR
Part to be diagnosed Diagnosis Mode Function description
Pre-crash seat belt Self-diagnosis Results
 Displays data recorded when a malfunction is de-
tected.
 Erases DTC recorded in memory.
Data Monitor Displays input data for pre-crash seat belt control
unit in real time.
Work Support Changes the setting for each system function.
CAN DIAG SUPPORT MNTR Monitors communication status of CAN communi-
cation.
Ecu Identification Displays pre-crash seat belt control unit part num-
ber.
Monitor item Contents
BUCKLE SW RH Indicates [ON/OFF] condition of seat belt buckle switch (RH).
BUCKLE SW LH Indicates [ON/OFF] condition of seat belt buckle switch (LH).
VEHICLE DISTANCE Indicates [ON/OFF] condit ion of intelligent brake assist signal.
IGN SW Indicates [ON/OFF] condition of ignition switch.
FR DOOR SW RH Indicates [Close/Open] condition of front door switch (RH).
FR DOOR SW LH Indicates [Close/Open] condition of front door switch (LH).
ABS ACTIVATING Indicates [ON/OFF] co ndition of ABS operation signal.
VHCL SPEED Indicates [Km/h] vehicle speed signal.
BRK PEDAL SNSR1 Indicates [V] voltage of brake pedal stroke sensor 1 signal.
BRK PEDAL SNSR2 Indicates [V] voltage of brake pedal stroke sensor 2 signal.
STRG ANGLE Indicates [deg] steering angle signal.
STRG ANGLE SPEED Indicates [deg/s] steering angle speed signal.
INCLINATION JDMT Indicates [ON/OFF] condition of pre roll over signal.
PRE-TEN ACTIVTN Indicates [ON/OFF] condition of pre-tensioner operated signal.
HEAT PROTC RH Indicates [ON/OFF] condition of heat protection (RH).
HEAT PROTC LH Indicates [ON/OFF] condition of heat protection (LH).
Revision: 2010 May2011 QX56

DIAGNOSIS AND REPAIR WORKFLOWSBC-31
< BASIC INSPECTION >
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000006237890
1.GET INFORMATION FOR SYSTEM
Interview the customer to obtain the malfunction information (conditions and environment when the malfunc-
tion occurred) as much as possible when the customer brings the vehicles in.
>> GO TO 2.
JMHIA1405GB
Revision: 2010 May2011 QX56

SBC-32
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
2.STUDY AND UNDERSTAND THE SYSTEM DESCRIPTION
Understand the operation condition or non-operation c ondition of pre-crash seat belt. Refer to SBC-7, "
PRE-
CRASH SEAT BELT SYSTEM : System Description".
>> GO TO 3.
3.CHECK DTC
Perform “Self-diagnosis procedure” of appropria te DTC to check if DTC is detected again.
At this time, always connect CONSULT-III to the vehicl e, and then check the diagnosis results in real time on
“DATA MONITOR (AUTO RECORD)”.
There is no priority for each DTC. Record them based on the following rules.
Current malfunction: Record all DTCs detected.
Past malfunction: Record up to 5 DTCs . When the 6th DTC is detected, it is overwritten to the first recorded
DTC.
Is DTC detected?
YES >> GO TO 4.
NO >> GO TO 5.
4.PERFORM DTC CONFIRMATION PROCEDURE
Perform the inspection with “DTC REPRO DUCTION PROCEDURE” of the applicable system.
YES >> GO TO 6.
NO >> Check intermittent incident.Refer to GI-40, "
Intermittent Incident".
5.DETECT MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS
Detect malfunctioning system according to SYMPTOM DIAGNOSIS based on the confirmed symptom in step
3, and determine the trouble diagnosis order based on possible causes and symptom.
>> GO TO 6.
6.DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE
Identify the malfunctioning part with “Diagnosis Procedure”.
>> GO TO 7.
7.REPAIR OR REPLACE THE MALFUNCTIONING PART
Repair or replace the specified malfunctioning parts.
>> GO TO 8.
8.FINAL CHECK
Perform “CONSULT-III function” again to chec k that the repair is performed correctly.
Check that malfunctions are not reproduced when obtaini ng the malfunction information from the customer,
referring to the symptom inspection result in step 3.
Are all malfunctions corrected?
YES >> INSPECTION END
NO-1 >> DTC is detected: GO TO 4.
NO-2 >> Symptom remains: GO TO 5.
Revision: 2010 May2011 QX56

U0126 ST ANG SEN SIGSBC-33
< DTC/CIRCUIT DIAGNOSIS >
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DTC/CIRCUIT DIAGNOSIS
U0126 ST ANG SEN SIG
DescriptionINFOID:0000000006237891
Inputs the steering angle signal from steering angle sensor via CAN communication.
DTC LogicINFOID:0000000006237892
DTC DETECTION LOGIC
NOTE:
If DTC U0126 is displayed with DTC U1000, first per form the trouble diagnosis for DTC U1000. Refer to SBC-
35, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON.
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SBC-33, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237893
1.CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Check “Self-diagnostic result” for “ABS” with CONSULT-III. Refer to BRC-40, "
CONSULT-III Function".
Is DTC detected?
YES >> Repair or replace malfunctioning parts.
NO >> GO TO 2.
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC Detection Condition Possible causes
U0126 ST ANG SEN SIG Receipt of a malfunction signal of Steering angle signal Steering angle sensor
Revision: 2010 May2011 QX56