2011 INFINITI QX56 ignition

DAS
U1000 CAN COMM CIRCUITDAS-59
< DTC/CIRCUIT DIAGNOSIS > [ADAS CONTROL UNIT]
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U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006223485
CAN COMMUNICATION
CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communicati on speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control units , 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, CAN-L) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads the required data only.
CAN communication signal chart. Refer to LAN-28, "
CAN COMMUNICATION SYSTEM : CAN Communica-
tion Signal Chart".
ITS COMMUNICATION
 ITS communication is a multiplex communication syste m. This enables the system to transmit and receive
large quantities of data at high speed by connec ting control units with 2 communication lines.
 ITS communication lines adopt twisted-pair line st yle (two lines twisted) for noise immunity.
DTC LogicINFOID:0000000006223486
DTC DETECTION LOGIC
NOTE:
If “U1000” is detected, first diagnose the CAN communication system.
Diagnosis ProcedureINFOID:0000000006223487
1.PERFORM THE SELF-DIAGNOSIS
1. Turn the ignition switch ON.
2. Turn the MAIN switch of ICC system ON, and then wait for 30 seconds or more.
3. Perform “All DTC Readi ng” with CONSULT-III.
4. Check if the “U1000” is detected as the current ma lfunction in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1000” detected as the current malfunction?
YES >> Refer to LAN-18, "Trouble Diagnosis Flow Chart".
NO >> Refer to GI-40, "
Intermittent Incident".
DTC
(On board display) Trouble diagnosis name DTC detecting condition Possible causes
U1000 (100) CAN COMM CIRCUIT If ADAS control unit is not transmitting or receiv-
ing CAN communication signal or ITS communi-
cation signal for 2 seconds or more  CAN communication system
 ITS communication system
Revision: 2010 May2011 QX56

DAS-62
< DTC/CIRCUIT DIAGNOSIS >[ADAS CONTROL UNIT]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000006223493
1.CHECK ADAS CONTROL UNIT POWER SUPPLY CIRCUIT
Check voltage between ADAS control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the ADAS control unit power supply circuit.
2.CHECK ADAS CONTROL UNIT GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the ADAS control unit connector.
3. Check for continuity between ADAS control unit harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair the ADAS control unit ground circuit.
Te r m i n a l Condition
Voltag e
(Approx.)
(+) (–)
ADAS control unit
GroundIgnition
switch
Connector Terminal
B61 16 OFF 0 V
ON Battery volt-
age
ADAS control unit
GroundContinuity
Connector Terminal
B61 6 Existed
Revision: 2010 May2011 QX56

DAS-64
< PRECAUTION >[DCA]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint S
ystem (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000006223495
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 w hether 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 inopera tive, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISS AN/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 “SRS AIR BAG”.
 Do not use electrical test equipmen t 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 minu tes before performing any service.
Precautions For Harness RepairINFOID:0000000006223496
ITS communication uses a twisted pair line. Be careful when repairing it.
 Solder the repaired area and wrap tape around the soldered area.
NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).
SKIB8766E
Revision: 2010 May2011 QX56

DAS
OPERATIONDAS-75
< SYSTEM DESCRIPTION > [DCA]
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NOTE:
When the DCA system is automatic ally canceled, the cancellation condition can be displayed on “WORK
SUPPORT” of CONSULT-III (ICC/ADAS).
Condition Description Display on combination meter
Warning display When the dynamic driver assistance
switch is turned ON with settings of
DCA system and LDP system OFF
The DCA system is not activated. The DCA
system switch indicator blinks.
 When the VDC or ABS (including the TCS) operates
 When the VDC is turned OFF
 When the SNOW mode switch is turned ON
 When the 4WD shift switch is turned to not AUTO
 When driving into a strong light (i.e., sunlight) The DCA system is automatically can-
celed. The chime will sound and the DCA
system switch indicator will blink.
NOTE:
The system operates if the dynamic driver
assistance switch is turned OFF
⇒ON after
the condition improves.
When the sensor window is dirty, mak-
ing it impossible to detect a vehicle
ahead The DCA system is automatically can-
celed. The chime sounds and the ICC sys-
tem warning lamp will come on and the
“CLEAN SENSOR” indicator will appear.
NOTE:
Stop the vehicle in a safe location and turn
the ignition switch OFF. Clean the dirty
area with soft cloth. The system returns to
normal condition when turning the ignition
switch ON again.
When the DCA system is not operating
properly The chime sounds and the ICC system
warning lamp will come on.
NOTE:
Turn the ignition switch OFF, and then turn
the ignition switch ON again. If there is no
malfunction, the system returns to the nor-
mal condition.
JSOIA0210ZZ
JSOIA0326ZZ
JSOIA0212ZZ
Revision: 2010 May2011 QX56

DAS-78
< SYSTEM DESCRIPTION >[DCA]
DIAGNOSIS SYSTEM (ADAS CONTROL UNIT)
DIAGNOSIS SYSTEM (ADAS CONTROL UNIT)
On Board Diagn
osis FunctionINFOID:0000000006223506
DESCRIPTION
The DTC is displayed on the information disp lay by operating the ICC steering switch.
On Board Self-diagnosis System Diagram
METHOD OF STARTING
CAUTION:
Start condition of on board self-diagnosis
 ICC system OFF
 DCA system OFF
 Vehicle speed 0 km/h (0 MPH)
1. Turn the ignition switch OFF.
2. Start the engine.
3. Wait for 5 seconds after starting the engine. Push up the RESUME/ACCELERATE switch 5 times and push down the
SET/COAST switch 5 times within 10 seconds.
NOTE:
If the above operation cannot be performed within 10 seconds
after waiting for 5 seconds after starting the engine, repeat the
procedure from step 1.
4. The DTC is displayed on the set vehicle speed indicator (1) on the ICC system display on the information display when the on board self-diagnosis starts. Refer to DAS-38, "
DTC Index".
NOTE:
JSOIA0271GB
PKIB8371E
JSOIA0008GB
Revision: 2010 May2011 QX56

DAS
DIAGNOSIS SYSTEM (ADAS CONTROL UNIT)
DAS-79
< SYSTEM DESCRIPTION > [DCA]
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 It displays for up to 5 minutes and then stops.
 If multiple malfunctions exist, up to 6 DTCs can be stored in memory at the most, and the most recent
one is displayed first.
WHEN THE ON BOARD SELF-DIAGNOSIS DOES NOT START
If the on board self-diagnosis does not start, check the following items.
HOW TO ERASE ON BOARD SELF-DIAGNOSIS
1. Turn the ignition switch OFF.
2. Start the engine, and then start the on board self-diagnosis.
3. Press the CANCEL switch 5 times, and then press the DIS-
TANCE switch 5 times under the condition that the on board
self-diagnosis starts.
NOTE:
 Complete the operation within 10 seconds after pressing the
CANCEL switch first.
 If the operation is not completed within 10 seconds, repeat the procedure from step 1.
4. DTC 55 is displayed after erasing. NOTE:
DTCs for existing malfunction can not be erased.
5. Turn ignition switch OFF, and finish the diagnosis.
CONSULT-III Function (ICC/ADAS)INFOID:0000000006223507
APPLICATION ITEMS
CONSULT-III performs the following functions via CAN communication using ADAS control unit.
WORK SUPPORT
Assumed abnormal part Inspection item
Information display Combination meter malfunction Check that the self-diagnosis function of the combina-
tion meter operates. Refer to
MWI-29, "
On Board Diag-
nosis Function"
ICC steering switch malfunction
Perform the inspection for DTC“C1A06”. Refer to CCS-
94, "Diagnosis Procedure"Harness malfunction between ICC steering switch and ECM
ECM malfunction
ADAS control unit malfunction  Check power supply and ground circuit of ADAS con-
trol unit. Refer to DAS-62, "
Diagnosis Procedure".
 Perform SELF-DIAGNOSIS for “ICC/ADAS”with
CONSULT-III, and then check the malfunctioning
parts. Refer to DAS-38, "
DTC Index".
PKIB8373E
Diagnosis mode Description
Work Support Displays causes of automatic system cancellation occurred during system control
Self Diagnostic Result Displays the name of a malfunctioning system stored in the ADAS control unit
Data Monitor Displays ADAS control unit input/output data in real time
Active Test Enables an operational check of a load by transmitting a driving signal from the ADAS control unit to
the load
Ecu Identification Displays ADAS control unit part number
CAN Diag Support Monitor Displays a reception/transmission state of CAN communication and ITS communication
Revision: 2010 May2011 QX56

DAS-80
< SYSTEM DESCRIPTION >[DCA]
DIAGNOSIS SYSTEM (ADAS CONTROL UNIT)
NOTE:
 Causes of the maximum five cancella
tions (system cancel) are displayed.
 The displayed cancellation causes display the number of the ignition switch ON/OFF up to 254. It is fixed to
254 if it is over 254. It returns to 0 when the same cancellation cause is detected again.
Display Items for The Cause of Automatic Cancellation 1
Work support items Description
CAUSE OF AUTO-CANCEL 1 Displays causes of automatic system cancellation occurred during control of the following sys-
tems
 Vehicle-to-vehicle distance control mode
 Conventional (fixed speed) cruise control mode
 Distance Control Assist (DCA)
CAUSE OF AUTO-CANCEL 2 Displays causes of automatic system cancellation occurred during control of the Lane Depar-
ture Prevention (LDP) system
Cause of cancellation
Vehicle-to-vehicle distance control mode
Conventional (fixed speed) cruise control mode Distance Control Assist
Description
OPERATING WIPER ×The wiper operates at HI (it includes when the wiper is operated at
HI with the wiper switch AUTO position)
OPERATING ABS ××ABS function was operated
OPERATING TCS ×××TCS function was operated
OPERATING VDC ×××VDC function was operated
ECM CIRCUIT ××ECM did not permit ICC operation
OPE SW VOLT CIRC ×××The ICC steering switch input voltage is not within standard range
LASER SUNBEAM ××Intense light such as sunlight entered ICC sensor light sensing part
LASER TEMP ××Temperature around ICC sensor became low
SNOW MODE SW ××SNOW mode switch was pressed
OP SW DOUBLE
TOUCH ××
ICC steering switches were pressed at the same time
VHCL SPD DOWN ×××Vehicle speed lower than the speed as follows
 Vehicle-to-vehicle distance control mode is 24 km/h (15 MPH)
 Conventional (fixed speed) cruise control mode is 32 km/h (20
MPH)
WHL SPD ELEC NOISE ×××Wheel speed sensor signal caught electromagnetic noise
VDC/TCS OFF SW ××VDC OFF switch was pressed
VHCL SPD UNMATCH ×××Wheel speed became different from A/T vehicle speed
TIRE SLIP ××Wheel slipped
IGN LOW VOLT ×××Decrease in ADAS control unit IGN voltage
PARKING BRAKE ON ××The parking brake is operating
WHEEL SPD UNMATCH ×××The wheel speeds of 4 wheels are out of the specified values
Revision: 2010 May2011 QX56

DAS
DIAGNOSIS SYSTEM (ACCELERATOR PEDAL ACTUATOR)
DAS-91
< SYSTEM DESCRIPTION > [DCA]
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DIAGNOSIS SYSTEM (ACCELER ATOR PEDAL ACTUATOR)
CONSULT-III Function (ACCELERATOR PEDAL ACT)INFOID:0000000006223509
DESCRIPTION
CONSULT-III performs the following functions via CAN communication with ADAS control unit and the com-
munication with accelerator pedal actuator.
SELF DIAGNOSTIC RESULT
Self Diagnostic Result
Refer to DAS-108, "DTC Index".
FFD (Freeze Frame Data)
The accelerator pedal actuator records the fo llowing data when the malfunction is detected.
NOTE:
 The number is 0 when is detected now.
 The number increases like 1 → 2 ··· 38 → 39 after returning to the normal condition whenever IGN OFF →
ON.
 The number is fixed to 39 until the self-di agnosis results are erased if it is over 39.
DATA MONITOR
Test mode Function
Self Diagnostic Result  Displays malfunctioning system memorized in accelerator pedal actuator
 Displays the Freeze Frame Data when the malfunction is detected
DATA MONITOR Displays real-time input/output data of accelerator pedal actuator
ACTIVE TEST Enables operation check of electrical loads by sending driving signal to them
ECU Identification Displays accelerator pedal actuator parts number
CAN Diag Support Monitor The results of transmit/receive diagnosis of ITS communication can be read
Freeze Frame Data item [Unit] Description
TGT FBK FRC
[N] It displays the target accelerator pedal actuation force that the accelerator pedal actuator read out
from the accelerator pedal feedback force control signal received via ITS communication at the time
when the malfunction is detected
TGT MOT POSI
[%] It displays the target motor position that the accelerator pedal actuator read out from the accelerator
pedal feedback force control signal received via ITS communication at the time when the malfunction
is detected
ACT MOT POSI
[%] It displays the integrated motor position that the accelerator pedal actuator read out at the time when
the malfunction is detected
AP OPEN
[%] It displays the accelerator pedal position signal that the accelerator pedal actuator read out via ITS
communication at the time when the malfunction is detected
APA TEMP
[ ° C] It displays the integrated motor temperature that the accelerator pedal actuator read out at the time
when the malfunction is detected
APA CURRENT
[A] It displays the integrated motor consumption current that the accelerator pedal actuator read out at
the time when the malfunction is detected
APA PWR
[V] It displays the power supply voltage that the accelerator pedal actuator read out at the time when the
malfunction is detected
APA OPE STATS
[On/Off] It displays the activation permission status of accelerator pedal actuator at the time when the mal-
function is detected
APA STATS
[READY/NG/TP NG/INIT] It displays the condition of accelerator pedal actuator at the time when the malfunction is detected
IGN Counter
NoteIt displays number of ignition switch OFF → ON after the malfunction is detected
Revision: 2010 May2011 QX56