2007 INFINITI QX56 DTC

ACS-1
ELECTRICAL
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SECTION ACS
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ACS
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CONTENTS
AUTO CRUISE CONTROL SYSTEM
ASCD
SERVICE INFORMATION ............................
3
AUTOMATIC SPEED CONTROL DEVICE
(ASCD) ................................................................
3
Description ................................................................3
ICC
SERVICE INFORMATION ............................
4
PRECAUTIONS ...................................................4
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
4
Precaution for ICC System Service ...........................4
PREPARATION ...................................................5
Special Service Tool .................................................5
DESCRIPTION ....................................................6
Outline .......................................................................6
Schematic .................................................................6
Component Description .............................................7
CAN Communication .................................................7
Switch Operation .......................................................7
ICC System Display ..................................................8
ACTION TEST .....................................................9
ICC System Running Test .........................................9
LASER BEAM AIMING ADJUSTMENT .............12
Outline of Laser Beam Aiming Adjustment Proce-
dure .........................................................................
12
Preparation ..............................................................12
Setting up the ICC Target Board .............................12
Sensor Adjustment ..................................................14
ELECTRICAL UNITS LOCATION ......................18
Component Parts and Harness Connector Loca-
tion ..........................................................................
18
WIRING DIAGRAM ...........................................19
Schematic ................................................................19
Wiring Diagram - ICC - ............................................20
TERMINALS AND REFERENCE VALUE .........24
Terminal and Reference Value for ICC Unit ............24
Terminal and Reference Value for ICC Sensor .......24
TROUBLE DIAGNOSIS — GENERAL DE-
SCRIPTION .......................................................
25
Work Flow ................................................................25
CONSULT-II Function (ICC) ....................................25
Self-Diagnostic Function ..........................................30
TROUBLE DIAGNOSIS FOR SELF-DIAG-
NOSTIC ITEMS .................................................
34
Diagnostic Trouble Code (DTC) Chart ....................34
DTC 11 CONTROL UNIT ........................................36
DTC 12 VDC CONTROL UNIT ................................36
DTC 20 CAN COMM CIRCUIT ................................37
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER
SUPPLY CIR2 .........................................................
37
DTC 41 VHCL SPEED SE CIRC .............................38
DTC 43 VDC/TCS/ABS CIRC .................................38
DTC 45 BRAKE SW/STOP L SW ............................38
DTC 46 OPERATION SW CIRC .............................40
DTC 74 LASER BEAM OFF CNTR .........................41
DTC 90 STOP LAMP RLY FIX ................................41
DTC 92 ECM CIRCUIT ............................................45
DTC 96 NP RANGE ................................................45
DTC 97 AT CIRCUIT ...............................................46
DTC 98 GEAR POSITION .......................................46
DTC 102 LASER STAIN ..........................................47
DTC 103 LASER SENSOR FAIL .............................47
DTC 104 LASER AIMING INCMP ...........................48
DTC 107 LASER COMM FAIL ................................48
DTC 109 LASER HIGH TEMP ................................48
TROUBLE DIAGNOSIS FOR SYMPTOMS ......49
Symptom Chart ........................................................49

ACS-4
< SERVICE INFORMATION >[ICC]
PRECAUTIONS
SERVICE INFORMATION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000003533772
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 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 whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoperative, 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 incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SRS section.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
Precaution for ICC System ServiceINFOID:0000000003533773
• Do not look straight into the laser beam discharger when adjusting laser beam aiming.
• Turn the ON/OFF switch OFF during chassis dynamometer testing.
• Do not remove, disassemble, or reposition the ICC sensor unless told to do so.
• Erase DTC when replacing parts of ICC system, then check the operation of ICC system after adjusting laser
beam aiming if necessary.

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
ACS-25
< SERVICE INFORMATION >[ICC]
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TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Work FlowINFOID:0000000003533791
• Reference 1··· Refer to ACS-30, "Self-Diagnostic Function".
• Reference 2··· Refer to ACS-34, "
Diagnostic Trouble Code (DTC) Chart".
• Reference 3··· Refer to ACS-49, "
Symptom Chart" .
• Reference 4··· Refer to GI-38, "
CONSULT-II Data Link Connector (DLC) Circuit" and ACS-30, "Self-Diagnos-
tic Function" .
CONSULT-II Function (ICC)INFOID:0000000003533792
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
SKIA1227E
ICC diagnostic mode Description
WORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the ICC unit for setting the sta-
tus suitable for required operation, input/output signals are received from the ICC unit and received
data is displayed.
SELF-DIAG RESULTS Displays ICC unit self-diagnosis results.
DATA MONITOR Displays ICC unit input/output data in real-time.

ACS-26
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure".
WORK SUPPORT
Work Item
Cause of Auto-Cancel
1. Touch “WORK SUPPORT” on "SELECT DIAG MODE" screen.
2. Touch “CAUSE OF AUTO-CANCEL” on "SELECT WORK ITEM"
screen.
3. Cause of automatic cancellation screen will be shown.
4. The last five causes of automatic cancellation of ICC system will
be displayed.
Possible Causes of "Auto-Cancel"
Laser Beam Adjust
For details, refer to ACS-12 .
SELF-DIAGNOSTIC RESULTS
For details, refer to ACS-34, "Diagnostic Trouble Code (DTC) Chart" .
DATA MONITOR
CAN DIAG SUPPORT MNTR The results of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending driving signal to them.
ECU PART NUMBER ICC unit part number can be read.ICC diagnostic mode Description
Operation Function
CAUSE OF AUTO-CANCEL Indicates causes of automatic cancellation of the ICC system.
LASER BEAM ADJUST Outputs laser beam, calculates dislocation of the beam, and indicates adjustment direction.
SKIA6191E
Cause of cancellation Description
OPERATING WIPER Windshield wipers were operated at HI or LO speed operation.
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 Voltage outside the standard was detected.
LASER SUN BEAM Intense light such as sunlight entered ICC sensor light sensing part.
LASER TEMP Temperature around ICC sensor became low.
WHL SPD ELEC NOISE Wheel speed sensor signal caught electromagnetic noise.
OP SW DOUBLE TOUCH ICC steering switches were pressed at the same time.
VDC/TCS OFF SW VDC OFF switch was pressed.
WHEEL SPD UNMATCH Wheel speed became different from AT vehicle speed.
TIRE SLIP Wheel slipped.
PKB SW ON Parking brake is applied.
IGN LOW VOLT Power supply voltage became low.
NO RECORD—

ACS-30
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
• Touch “ON” and “OFF” to check that the stop lamps operate as in
the following chart.
BOOSTER SOL/V 3
• Touch any of “MODE 1”, “MODE 2”, “MODE 3” to check that follow-
ing operation condition is caused by operating monitor and brake
pedal.
• “START” is displayed 10 seconds after operation start. (Active test
is completed.)
Self-Diagnostic FunctionINFOID:0000000003533793
WITH CONSULT-II
1. Go to operation check after asking the customer for symptom information. Refer to ACS-9 .
2. Stop vehicle, turn ignition switch OFF, then connect CONSULT-II and CONSULT-II CONVERTER to data
link connector.
3. With engine started, touch “START”, “ICC”, “SELF-DIAG RESULTS” on CONSULT-II screen in this order.
CAUTION:
If “ICC” cannot be shown after several attempts, the ICC unit may be malfunctioning and should
be replaced. Refer to ACS-55
.
4. Self-diagnostic result appears on screen. If “NO DTC ···” is shown, check ICC warning lamp. If any mal-
function is indicated, GO TO step 5.
5. Refer to ACS-34, "
Diagnostic Trouble Code (DTC) Chart", perform appropriate check, and repair or
replace malfunctioning part as necessary.
6. Turn ignition switch OFF.
7. Start engine and touch “START”, “ICC”, “SELF-DIAG RESULTS”, and “ERASE” on CONSULT-II.
CAUTION:
DTC of an existing malfunction will not erase. If the memory does not erase, GO TO step 5.
8. Perform ICC system running test (drive vehicle with ICC system ON), and make sure that ICC warning
lamp does not illuminate.
WITHOUT CONSULT-II
STOP LAMP ON OFF
Stop lamp Lamp ON Lamp OFF
SKIA1232E
SKIA1233E
PKIA0363J

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
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1. Go to operation check after asking the customer for symptom information. Refer to ACS-9.
2. Stop the vehicle to start the self-diagnosis.
3. Turn ignition switch OFF.
4. Turn ignition switch ON, and wait 5 seconds. Press ACCEL/RES
switch 5 times, and then press COAST/SET switch 5 times all
within 5 seconds to start self-diagnosis.
CAUTION:
• Do not start the engine.
• Do not press the ICC ON/OFF switch ON.
• When operation above is not completed within the 5 to 10 sec-
ond window, DTC will not be displayed.
• If self-diagnosis mode cannot be started after several
attempts, the ICC unit may be malfunctioning and should be
replaced. Refer to "SELF-DIAGNOSIS BY ICC SYSTEM DIS-
PLAY WILL NOT RUN".
5. When self-diagnosis mode is started, DTCs are shown on set vehicle speed indicator.
CAUTION:
• DTC will disappear after 5 minutes.
• When multiple malfunctions are detected, a maximum of 3 code numbers can be stored; the lat-
est malfunction will be displayed first.
6. Check ACS-34, "
Diagnostic Trouble Code (DTC) Chart" , and repair or replace if necessary.
7. After repair, erase DTC stored in the ICC unit. Refer to "Self-Diagnostic Erasing Method".
8. DTC 55 will be shown.
9. Turn ignition switch OFF to exit the diagnosis.
10. Perform ICC system running test (drive vehicle with ICC system ON), and make sure that ICC warning
lamp does not illuminate.
Self-Diagnostic Erasing Method
1. Stop the vehicle and turn the ignition switch OFF.
2. Turn ignition switch ON and start self-diagnosis.
3. During self-diagnosis mode, press CANCEL switch 5 times, and DISTANCE switch 5 times within a 10
second time period.
CAUTION:
• Switch inputs must be received within a 10 second time period.
• When operation is not completed within 10 seconds start again from step 1.
4. DTC 55 will be shown.
CAUTION:
DTC of an existing malfunction will not be erased.
5. Turn ignition switch OFF to exit the diagnosis.
WKIA1921E
WKIA1922E

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
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NG >> Replace ICC steering switch. Refer to ACS-54, "ICC Steering Switch" .
4.CHECK HARNESS BETWEEN ECM AND ICC STEERING SWITCH
Check harness and spiral cable between ECM and ICC steering switch for open or short circuit.
OK or NG
OK >> GO TO 6
NG >> Repair or replace harness or spiral cable between ECM and ICC steering switch.
5.CHECK POWER SUPPLY FOR ICC UNIT
• Check ICC unit power supply, and repair if necessary.
• When ignition switch is ON, do all displays illuminate?
YES or NO
YES >> Perform self-diagnosis again.
NO >> GO TO 6.
6.CHECK CONNECTOR FOR ICC UNIT
• Disconnect connectors ICC unit, and check terminals for bends and looseness. Securely connect them
again.
• When ignition switch is ON, do all displays illuminate?
YES or NO
YES >> Perform self-diagnosis again.
NO >> GO TO 7.
7.CHECK CAN COMMUNICATION
Perform self-diagnosis with CONSULT-II, and check CAN communication system for malfunction.
OK or NG
OK >> Replace combination meter. Refer to DI-21, "Removal and Installation of Combination Meter" .
NG >> CAN communication inspection. Refer to ACS-37, "
DTC 20 CAN COMM CIRCUIT".

ACS-34
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Diagnostic Trouble Code (DTC) ChartINFOID:0000000003533794
×:Applicable
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Vehicle-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake as-
sist (with
preview
function)
11 CONTROL UNIT×××ו ICC unit internal malfunctionACS-36,
"DTC 11
CON-
TROL
UNIT"
12 VDC CONTROL UNIT×××ו VDC malfunction
• Brake booster signal harness is
open or shortedACS-36,
"DTC 12
VDC
CON-
TROL
UNIT"
20 CAN COMM CIRCUIT×××ו ICC unit detected CAN communi-
cation malfunctionACS-37,
"DTC 20
CAN
COMM
CIR-
CUIT"
31 POWER SUPPLY CIR1×××ו ICC unit power supply voltage is
excessively low (less than 8V)ACS-37,
"DTC 31
POWER
SUPPLY
CIR1,
DTC 34
POWER
SUPPLY
CIR2"
34 POWER SUPPLY CIR2×××ו ICC unit power supply voltage is
excessively high.ACS-37,
"DTC 31
POWER
SUPPLY
CIR1,
DTC 34
POWER
SUPPLY
CIR2"
41 VHCL SPEED SE CIRC×××ו Wheel sensor malfunction
• ABS actuator and electric unit
(control unit) malfunction
• A/T vehicle speed sensor mal-
function
•TCM malfunctionACS-38,
"DTC 41
VHCL
SPEED
SE CIRC"
43 VDC/TCS/ABS CIRC×××ו VDC/TCS/ABS system malfunc-
tionACS-38,
"DTC 43
VDC/
TCS/ABS
CIRC"