2007 INFINITI QX56 brake sensor

ACCELERATOR CONTROL SYSTEM
ACC-3
< SERVICE INFORMATION >
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ACCELERATOR CONTROL SYSTEM
Removal and InstallationINFOID:0000000003532214
Adjustable Accelerator Pedal
CAUTION:
• Do not disassemble the accelerator pedal adjusting mechanism.
• Before removal and installation the accelerator and brake pedals must be in the frontmost position.
This is to align the base position of the accelerator and brake pedals.
• Do not disassemble the accelerator pedal assembly.
• Do not remove the accelerator pedal position sensor from the accelerator pedal bracket.
• Avoid damage from dropping the accelerator pedal assembly during handling.
• Keep the accelerator pedal assembly away from water.
REMOVAL
1. Move the accelerator and brake pedals to the frontmost position.
2. Turn the ignition switch OFF and disconnect the negative battery terminal.
3. Disconnect the adjustable brake pedal cable from the adjustable brake pedal.
• Unlock, then pull the adjustable brake pedal cable to disconnect it from the adjustable brake pedal.
LBIA0379E
1. Adjustable accelerator pedal assem-
bly2. A/T control cable mounting bracket (part
of the accelerator pedal assembly)3. Adjustable pedal electric motor (part
of the accelerator pedal assembly)
4. Adjustable brake pedal cable (part of
the accelerator pedal assembly)

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ELECTRICAL
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SECTION ACS
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B
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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-2
Symptom 1 ON/OFF Switch Does Not Switch
ON*1, ON/OFF Switch Does Not Switch OFF*2 ......49
Symptom 2 the ICC System Cannot Be Set (ON/
OFF Switch Turns On/Off) ......................................
50
Symptom 3 the ICC System Cannot Be Operated
by the CANCEL Switch, ACCEL/RES Switch, or
DISTANCE Switch ..................................................
51
Symptom 4 the ICC System Is Not Cancelled
When the Gear Is in ‘N’ ..........................................
51
Symptom 5 Chime Does Not Sound .......................51
Symptom 6 Driving Force Is Hunting ......................52
Symptom 7 the ICC System Frequently Cannot
Detect the Vehicle Ahead/The Detection Zone Is
Short .......................................................................
52
Symptom 8 the System Does Not Detect the Vehi-
cle Ahead at All .......................................................
53
ELECTRICAL COMPONENT INSPECTION .....54
ICC Steering Switch ................................................54
ICC Brake Switch and Stop Lamp Switch ...............54
Parking Brake Switch ..............................................54
REMOVAL AND INSTALLATION .....................55
ICC Unit ..................................................................55
ICC Sensor .............................................................55
ICC Steering Switch ................................................55

ACS-6
< SERVICE INFORMATION >[ICC]
DESCRIPTION
DESCRIPTION
OutlineINFOID:0000000003533775
The Intelligent Cruise Control (ICC) system automatically maintains a selected distance from the vehicle
ahead according to that vehicle's speed, or at the set speed, if the road ahead is clear.
The ICC function has two cruise control modes and brake assist (with preview function). The ICC system may
AUTO-CANCEL for various reasons, for example, when the windshield wipers are operating.
VEHICLE-TO-VEHICLE DISTANCE CONTROL MODE
Vehicle-to-vehicle distance control mode, the same speed as other vehicles, can be maintained without the
constant need to adjust the operating speed as with a conventional cruise control system.
The system is intended to enhance the operation of the vehicle when following another vehicle in the same
lane and direction.
If the distance sensor detects a slower moving vehicle ahead, the system will reduce speed so that the vehicle
ahead can be followed at the selected distance.
The system automatically controls the throttle and applies the brakes (up to 25% of vehicle braking power) if
necessary.
The detection range of the sensor is approximately 120 m (390 ft) ahead.
Refer to Owner's Manual for Intelligent Cruise Control System operating instructions.
CONVENTIONAL (FIXED SPEED) CRUISE CONTROL MODE
Conventional (fixed speed) cruise control mode is cruising at preset speeds.
Refer to Owner's Manual for Intelligent Cruise Control System operation instructions.
BRAKE ASSIST (WITH PREVIEW FUNCTION)
When the force applied to brake pedal exceeds a certain level, the brake assist is activated and generates a
greater braking force than that of a conventional brake booster, even with light pedal force.
When the preview function identifies the need to apply the sudden brake by sensing the vehicle ahead in the
same lane and the distance and relative speed from it, it applies the brake pre-pressure before driver
depresses the brake pedal and improves brake response by reducing its free play.
Refer to Owner's Manual for Intelligent Cruise Control System operating instructions.
SchematicINFOID:0000000003533776
WKIA1976E

DESCRIPTION
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< SERVICE INFORMATION >[ICC]
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Component DescriptionINFOID:0000000003533777
CAN CommunicationINFOID:0000000003533778
SYSTEM DESCRIPTION
Refer to LAN-4 .
Switch OperationINFOID:0000000003533779
The system is operated by a master ON/OFF switch and four control switches, all mounted on the steering
wheel.
ComponentVehicle-to-vehicle
distance control
modeConventional
(fixed speed)
cruise control
modeBrake assist
(with preview
brake)Description
ICC unit×××Controls vehicle speed through ECM via CAN
communication.
ICC sensor××Irradiate laser beam, and receives reflected la-
ser beam to measure distance from preceding
vehicle.
ECM×××Transmits throttle position signal and ICC steer-
ing switch signal to ICC unit.
ABS actuator and electric
unit (control unit)×××Transmits wheel speed signal to ICC unit. Oper-
ates brake booster based on CAN communica-
tion.
Brake pressure sensor××Detects fluid pressure in master cylinder.
Brake booster××Adjusts brake fluid pressure based on command
from ABS actuator and electric unit (control unit).
BCM×Transmit front wiper request signal to ICC unit.
TCM××Transmits gear position signal and output shaft
revolution signal to ICC unit.
No. Switch nameDescription
1 ACCEL/RES switch Resumes set speed or increases speed incrementally.
2 COAST/SET switch Sets desired cruise speed, reduces speed incrementally.
3 ON/OFF switch Master switch to activate the system.
SKIA5973E

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< SERVICE INFORMATION >[ICC]
LASER BEAM AIMING ADJUSTMENT
LASER BEAM AIMING ADJUSTMENT
Outline of Laser Beam Aiming Adjustment ProcedureINFOID:0000000003533782
CAUTION:
• The laser beam aiming adjustment cannot be performed without CONSULT-II.
• The laser beam aiming adjustment must be performed every time the ICC sensor is removed,
installed or has been moved as a result of a collision.
1. Prepare the vehicle and the work area.
2. Set up the ICC target board. For details, refer to Technical Service Bulletin.
3. Adjust the sensor following the procedure on CONSULT-II.
4. Check system operation after the adjustment.
PreparationINFOID:0000000003533783
• Place the vehicle on level ground. Shift the transmission into "P" position and release the parking brake.
• Adjust the tire pressure to the specified value.
• See that there is no load in the vehicle. Coolant, engine oil and fuel should be filled to correct level.
• Check that the vehicle suspension has been adjusted to the standard height by the load leveling rear air sus-
pension system. Refer to RSU-10, "
Basic Inspection" .
• Clean the sensor with a soft cloth.
Setting up the ICC Target BoardINFOID:0000000003533784
CAUTION:
Accuracy in setting up the ICC target board is essential for the laser beam aiming adjustment. For
details, refer to Technical Service Bulletin.
ADJUSTING HEIGHT OF THE TARGET
1. Attach a triangle scale as shown.Tool number : KV99110100 (J-45718)
LKIA0632E
WKIA1849E

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< SERVICE INFORMATION >[ICC]
TERMINALS AND REFERENCE VALUE
TERMINALS AND REFERENCE VALUE
Terminal and Reference Value for ICC UnitINFOID:0000000003533789
Terminal and Reference Value for ICC SensorINFOID:0000000003533790
Te r m i n a lWire col-
orItemCondition
Voltage (V)
(Approx.) Ignition
switchOperation
1W/L
Battery power supply OFF — Battery voltage
2W/L
5 P CAN-L — — —
7 B/R N-P RANGE ON A/T selector lever in "P" or "N" Battery voltage
10 V/R Brake booster signal ON —
14 L CAN-H — — —
19 B
Ground
ON——
20 B
29 BR/WICC brake switch
(normally closed)Selector le-
ver: Not in
“N” or “P”
positionDepress the brake
pedal0
Release the brake
pedalBattery voltage
30 L DDL-TX — — —
33 R/B Ignition switch power supply ON —
Battery voltage
38 R/GSt op la mp sw i tc h
(normally open) OFFDepress the brake pedal
Release the brake pedal 0
39 V/W DDL-RX — — —
40 G Parking brake signal
ONParking brake is ON 0
Parking brake is OFF Battery voltage
42 R/B Ignition switch power supply — Battery voltage
46 B Ground — —
47 BR Stop lamp drive output signalBrake operating with ICC system Battery voltage
Brake not operating with ICC sys-
tem0
SKIA1243E
Te r m i n a lWire
colorItemCondition
Voltage (V)
Ignition
switchOperation
1 R/B Ignition switch power supply
ON— Battery voltage
2LCAN-H — —
3PCAN-L — —
4 B Ground — —

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—