2011 INFINITI QX56 steering

BCS
BCM
BCS-55
< ECU DIAGNOSIS INFORMATION >
C
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B A
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N
B2603: SHIFT POSI STATUS Inhibit steering lock
500 ms after any of the following BCM recognition conditions are fulfilled
Status 1
- Ignition switch is in the ON position
- Selector lever P position switch signal: Except P position (12 V)
- Selector lever P/N position signal: Except P and N positions (0 V)
Status 2
- Ignition switch is in the ON position
- Selector lever P position switch signal: P position (0 V)
- Selector lever P/N position signal: P or N positions (12 V)
B2604: PNP/CLUTCH SW Inhibit steering lock 500 ms after any of the following BCM recognition conditions are fulfilled
Status 1
- Ignition switch is in the ON position
- Selector lever P/N position signal: P or N position (12 V)
- Shift position signal (CAN): P or N position
Status 2
- Ignition switch is in the ON position
- Selector lever P/N position signal: Except P and N positions (0 V)
- Shift position signal (CAN): Except P and N position
B2605: PNP/CLUTCH SW Inhibit steering lock 500 ms after any of the following BCM recognition conditions are fulfilled
Status 1
- Power position: IGN
- Selector lever P/N position signal: Except P and N positions (0 V)
- Interlock/PNP switch signal (CAN): OFF
Status 2
- Ignition switch is in the ON position
- Selector lever P/N position signal: P or N position (12 V)
- Interlock/PNP switch signal (CAN): ON
B2608: STARTER RELAY Inhibit engine cranking 500 ms after the following signal communication status becomes con-
sistent
 Starter motor re
lay control signal
 Starter relay status signal (CAN)
B2609: S/L STATUS  Inhibit engine crank-
ing
 Inhibit steering lock When the following steering lock conditions agree
 BCM steering lock control status
 Steering lock condition No. 1 signal status
 Steering lock condition No. 2 signal status
B260B: STEERING LOCK UNIT Inhibit steering lock Erase DTC
B260D: STEERING LOCK UNIT Inhibit steering lock Erase DTC
B260F: ENG STATE SIG LOST Inhibit engine cranking When any of the following conditions are fulfilled
 Power position changes to ACC
 Receives engine status signal (CAN)
B2612: S/L STATUS  Inhibit engine crank-
ing
 Inhibit steering lock When any of the following conditions are fulfilled
 Steering lock unit status signal (CAN) is received normally
 The BCM steering lock control status matches the steering lock status
recognized by the steering lock unit status signal (CAN from IPDM E/
R)
B2619: BCM Inhibit engine cranking 1 second after the steering lock unit power supply output control inside
BCM becomes normal
B26EF: STRG LCK RELAY OFF Inhibit engine cranking When the following conditions are fulfilled
 Steering lock relay signal (CAN): ON
 Steering lock unit status signal (CAN): ON
B26F0: STRG LCK RELAY ON Inhibit engine cranking When the following conditions are fulfilled
 Steering lock relay signal (CAN): OFF
 Steering lock unit status signal (CAN): OFF
B26F1: IGN RELAY OFF Inhibit engine cranking When the following conditions are fulfilled
 Ignition switch ON signal (CAN: Transmitted from BCM): ON
 Ignition switch ON signal (CAN: Transmitted from IPDM E/R): ON
B26F2: IGN RELAY ON Inhibit engine cranking When the following conditions are fulfilled
 Ignition switch ON signal (CAN: Transmitted from BCM): OFF
 Ignition switch ON signal (CAN: Transmitted from IPDM E/R): OFF
Display contents of CONSULT Fail-safe Cancellation
Revision: 2010 May2011 QX56

BCS-56
< ECU DIAGNOSIS INFORMATION >
BCM
FAIL-SAFE CONTROL BY RAIN SENSOR MALFUNCTION
BCM detects the light and rain sensor serial link error and the rain sensor malfunction.
BCM controls the following fail-safe when rain sensor has a malfunction.
 Front wiper switch AUTO and sensing rain drop: The condition just before the activation of fail-safe is main-
tained until the front wiper switch is turned OFF.
 Front wiper switch AUTO and not sensing rain drop: Front wiper is LO operation until the front wiper switch is
turned off.
REAR WIPER MOTOR PROTECTION
BCM detects the rear wiper stopping position acco rding to the rear wiper stop position signal.
When the rear wiper stop position signal does not c hange for more than 5 seconds while driving the rear
wiper, BCM stops power supply to protect the rear wiper motor.
Condition of cancellation
1. More than 1 minute is passed after the rear wiper stop.
2. Turn rear wiper switch OFF.
3. Operate the rear wiper swit ch or rear washer switch.
FAIL-SAFE CONTROL OF COMBINATION SWITCH READING FUNCTION CAUSED BY LOW
POWER SUPPLY VOLTAGE
If voltage of battery power supply lower, BCM maintain s combination switch reading to the status when input
voltage is less than approximately 9 V.
NOTE:
When voltage of battery power supply is approximately 9 V or more, combination switch reading function
returns to normal operation.
DTC Inspection Priority ChartINFOID:0000000006274821
If some DTCs are displayed at the same time, perfo rm inspections one by one based on the following priority
chart.
B26F3: START CONT RLY ON Inhibit engine cranking When the following conditions are fulfilled
 Starter control relay signal (CAN: Transmitted from BCM): OFF
 Starter control relay signal (CAN: Transmitted from IPDM E/R): OFF
B26F4: START CONT RLY OFF Inhibit engine cranking When the following conditions are fulfilled
 Starter control relay signal (CAN: Transmitted from BCM): ON
 Starter control relay signal (CAN: Transmitted from IPDM E/R): ON
B26F7: BCM Inhibit engine cranking
by Intelligent Key sys-
temWhen room antenna and luggage room antenna functions normally
U0415: VEHICLE SPEED Inhibit steering lock When vehicle speed signal (Meter) (CAN) is received normally
Display contents of CONSULT Fail-safe Cancellation
Priority DTC
1 B2562: LOW VOLTAGE
2  U1000: CAN COMM
 U1010: CONTROL UNIT (CAN)
3  B2192: ID DISCORD BCM-ECM
 B2193: CHAIN OF BCM-ECM
 B2195: ANTI-SCANNING
 B2198: NATS ANTENNA AMP
Revision: 2010 May2011 QX56

BCS
BCM
BCS-57
< ECU DIAGNOSIS INFORMATION >
C
D E
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B A
O P
N
DTC IndexINFOID:0000000006274822
NOTE:
The details of time display are as follows.
 CRNT: A malfunction is detected now.
 PAST: A malfunction was detected in the past.
IGN counter is displayed on Freeze Frame Data. For details of Freeze Frame Data, refer to
BCS-14, "
COM-
MON ITEM : CONSULT-III Function (BCM - COMMON ITEM)".
4 B2013: ID DISCORD BCM-S/L
 B2014: CHAIN OF S/L-BCM
 B2555: STOP LAMP
 B2556: PUSH-BTN IGN SW
 B2557: VEHICLE SPEED
 B2601: SHIFT POSITION
 B2602: SHIFT POSITION
 B2603: SHIFT POSI STATUS
 B2604: PNP/CLUTCH SW
 B2605: PNP/CLUTCH SW
 B2608: STARTER RELAY
 B2609: S/L STATUS
 B260B: STEERING LOCK UNIT
 B260C: STEERING LOCK UNIT
 B260D: STEERING LOCK UNIT
 B260F: ENG STATE SIG LOST
 B2612: S/L STATUS
 B2614: BCM
 B2615: BCM
 B2616: BCM
 B2618: BCM
 B2619: BCM
 B261A: PUSH-BTN IGN SW
 B26E9: LOCK MALFUNCTION
 B26EF: STRG LCK RELAY OFF
 B26F0: STRG LCK RELAY ON
 B26F1: IGN RELAY OFF
 B26F2: IGN RELAY ON
 B26F3: START CONT RLY ON
 B26F4: START CONT RLY OFF
 B26F5: STRG LCK STS SW
B26F6: BCM
B26F7: BCM
B26F8: BCM
 B26F9: CRANK REQ CIR SHORT
 B26FA: CRANK REQ CIR OPEN
 B26FC: KEY REGISTRATION
 U0415: VEHICLE SPEED
5  B2621: INSIDE ANTENNA
 B2622: INSIDE ANTENNA
 B2623: INSIDE ANTENNA
6  B2626: OUTSIDE ANTENNA
 B2627: OUTSIDE ANTENNA
 B2628: OUTSIDE ANTENNA
7 B26E7: TPMS CAN COMM
Priority DTC
Revision: 2010 May2011 QX56

BCS-58
< ECU DIAGNOSIS INFORMATION >
BCM
CONSULT display Fail-safeFreeze Frame Data
Vehicle Speed
Odo/Trip Meter
Vehicle Condition Intelligent Key warn-
ing lamp ON Reference
page
No DTC is detected.
further testing
may be required. ————
U1000: CAN COMM — — — BCS-70
U1010: CONTROL UNIT (CAN) — — —BCS-71
U0415: VEHICLE SPEED×— ×BCS-72
B2013: ID DISCORD BCM-S/L ××× SEC-69
B2014: CHAIN OF S/L-BCM××× SEC-70
B2192: ID DISCORD BCM-ECM×—— SEC-60
B2193: CHAIN OF BCM-ECM ×—— SEC-61
B2195: ANTI-SCANNING ×—— SEC-62
B2196: DONGLE NG ×—— SEC-63
B2198: NATS ANTENNA AMP ×—— SEC-65
B2555: STOP LAMP — ××SEC-73
B2556: PUSH-BTN IGN SW — ××SEC-76
B2557: VEHICLE SPEED ××× SEC-78
B2562: LOW VOLTAGE — ×—BCS-73
B2601: SHIFT POSITION ××× SEC-79
B2602: SHIFT POSITION××× SEC-82
B2603: SHIFT POSI STATUS××× SEC-85
B2604: PNP/CLUTCH SW××× SEC-89
B2605: PNP/CLUTCH SW××× SEC-91
B2608: STARTER RELAY××× SEC-93
B2609: S/L STATUS××× SEC-95
B260B: STEERING LOCK UNIT××× SEC-98
B260C: STEERING LOCK UNIT — ××SEC-99
B260D: STEERING LOCK UNIT ××× SEC-100
B260F: ENG STATE SIG LOST××× SEC-101
B2612: S/L STATUS××× SEC-102
B2614: BCM — ××PCS-56
B2615: BCM — ××PCS-59
B2616: BCM — ××PCS-61
B2618: BCM — ××PCS-63
B2619: BCM ××× SEC-105
B261A: PUSH-BTN IGN SW — ××PCS-64
B2621: INSIDE ANTENNA — ×—DLK-104
B2622: INSIDE ANTENNA — ×—DLK-106
B2623: INSIDE ANTENNA — ×—DLK-108
B2626: OUTSIDE ANTENNA — ×—DLK-110
B2627: OUTSIDE ANTENNA — ×—DLK-112
B2628: OUTSIDE ANTENNA — ×—DLK-114
B26E7: TPMS CAN COMM — — — BCS-74
Revision: 2010 May2011 QX56

BCS-82
< REMOVAL AND INSTALLATION >
COMBINATION SWITCH
COMBINATION SWITCH
Exploded ViewINFOID:0000000006274846
Removal and InstallationINFOID:0000000006274847
REMOVAL
1. Remove steering column cover. Refer to IP-13, "Exploded View".
2. Remove screws.
3. Disconnect the connector.
4. Pull up the combination switch to remove it.
INSTALLATION
Install in the reverse order of removal.
1. Combination switch 2. Combination switch connector
JMMIA0328ZZ
Revision: 2010 May2011 QX56

BR-1
BRAKES
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SECTION BR
A
B
BR
N
O P
CONTENTS
BRAKE SYSTEM
PRECAUTION ................ ...............................3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
3
Precaution for Procedure without Cowl Top Cover ......4
Precaution for Brake system .....................................4
PREPARATION ............................................5
PREPARATION .............................................. .....5
Commercial Service Tools .................................. ......5
SYMPTOM DIAGNOSIS ...............................6
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ........................ .....
6
NVH Troubleshooting Chart ................................ ......6
PERIODIC MAINTENANCE ..........................7
BRAKE PEDAL .............................................. .....7
Inspection and Adjustment .................................. ......7
BRAKE FLUID ....................................................10
Inspection ............................................................ ....10
Draining ...................................................................10
Refilling ...................................................................11
Bleeding Brake System ...........................................11
HYDRAULIC BOOSTER ASSEMBLY ...............15
Inspection ............................................................ ....15
FRONT DISC BRAKE .................................... ....16
BRAKE PAD .......................................................... ....16
BRAKE PAD : Inspection and Adjustment ..............16
DISC ROTOR ......................................................... ....16
DISC ROTOR : Inspection and Adjustment ............16
REAR DISC BRAKE .........................................18
BRAKE PAD .......................................................... ....18
BRAKE PAD : Inspection and Adjustment ...............18
DISC ROTOR ......................................................... ....18
DISC ROTOR : Inspection and Adjustment .............18
REMOVAL AND INSTALLATION ...............20
BRAKE PEDAL ................................ .................20
Exploded View ..................................................... ....20
Removal and Installation .........................................20
Inspection and Adjustment ......................................21
BRAKE PIPING ................................ .................22
FRONT ................................................................... ....22
FRONT : Exploded View .........................................22
FRONT : Hydraulic Piping .......................................23
FRONT : Removal and Installation ..........................23
FRONT : Inspection .................................................24
REAR ..................................................................... ....24
REAR : Exploded View ............................................25
REAR : Hydraulic Piping ..........................................25
REAR : Removal and Installation ............................26
REAR : Inspection ...................................................26
HYDRAULIC BOOSTER ASSEMBLY ..............28
Exploded View .........................................................28
Removal and Installation .........................................29
Disassembly and Assembly .....................................30
Inspection and Adjustment ......................................32
Disposal ...................................................................33
FRONT DISC BRAKE .......................................34
BRAKE PAD .......................................................... ....34
BRAKE PAD : Exploded View .................................34
BRAKE PAD : Removal and Installation ..................34
BRAKE PAD : Inspection . ........................................36
Revision: 2010 May2011 QX56

PRECAUTIONSBR-3
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006228171
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 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 whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision that would result in air ba g 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 “SRS AIR BAG”.
 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 Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, DO NOT use air or electric 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 Wh eel Rotation after Battery Disconnect
INFOID:0000000006228172
NOTE:
 Before removing and installing any control units, first tu rn the push-button ignition switch to the LOCK posi-
tion, then disconnect both battery cables.
 After finishing work, confirm that all control unit connectors are connected properly, then re-connect both
battery cables.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If a DTC is detected, perform trouble diagnos is according to self-diagnosis results.
For vehicle with steering lock unit, if the battery is disconnected or discharged, the steering wheel will lock and
cannot be turned.
If turning the steering wheel is required with the batte ry disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Turn the push-button ignition switch to ACC position. (At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock wil l remain released with both battery cables discon-
nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
Revision: 2010 May2011 QX56

BR-4
< PRECAUTION >
PRECAUTIONS
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button igniti on switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT-III.
Precaution for Procedure without Cowl Top CoverINFOID:0000000006228173
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precaution for Brake systemINFOID:0000000006222459
WARNING:
Clean any dust from the front brake and rear brake wi th a vacuum dust collector. Never blow with com-
pressed air.
 Brake fluid use refer to MA-10, "
Fluids and Lubricants".
 Never reuse drained brake fluid.
 Never spill or splash brake fluid on painted surfaces. Brake fluid may seriously damage paint. Wipe it off
immediately and wash with water if it gets on a painted surface.
 Always confirm the specified tightening torque when installing the brake pipes.
 After pressing the brake pedal more deeply or harder t han normal driving, such as air bleeding, check each
item of brake pedal. Adjust brake pedal if it is outside the standard value.
 Always clean with new brake fluid when cleaning the brake caliper and other components.
 Never use mineral oils such as gasoline or light oil to clean. They may damage rubber parts and cause
improper operation.
 Always loosen the brake tube flar e nut with a flare nut wrench.
 Tighten the brake tube flare nut to the specified torque with a crow-
foot (A) and torque wrench (B).
 Brake system is an important safety part. If a brake fluid leak is detected, always disassemble the affected part. If a malfunction is
detected, replace part with a new one.
 Always connect the battery terminals when moving the vehicle.
 Turn the ignition switch OFF and disconnect the hydraulic booster assembly harness connector or the battery negative terminal
before performing the work.
 Check that no brake fluid leakage is present after replacing the
parts.
 Burnish the brake contact surfaces after refinishing or replacing rotors, after replacing pads, or if a soft pedal occurs at very low mileage.
- Front brake pad: Refer to BR-16, "
BRAKE PAD : Inspection and Adjustment".
- Front disc rotor: Refer to BR-16, "
DISC ROTOR : Inspection and Adjustment".
- Rear brake pad: refer to BR-18, "
BRAKE PAD : Inspection and Adjustment".
- Rear disc rotor: BR-18, "
DISC ROTOR : Inspection and Adjustment".
PIIB3706J
JPFIA0001ZZ
Revision: 2010 May2011 QX56