INFINITI QX56 2007 Factory Repair Manual

ACS-48
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Are “DTC 11 CONTROL UNIT” or “DTC 20 CAN COMM CIRCUIT” item indicated in self-diagnosis display
item?
YES or NO
YES >> GO TO applicable item inspection. Refer to ACS-36, "DTC 11 CONTROL UNIT", and ACS-37,
"DTC 20 CAN COMM CIRCUIT".
NO >> • Replace ICC sensor and adjust laser beam aiming. Refer to ACS-55, "
ICC Sensor".
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
DTC 104 LASER AIMING INCMPINFOID:0000000003533811
1.DIAGNOSTIC CHECK
1. Adjust laser beam aiming. Refer to ACS-12
. Erase DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test".
2. Perform self-diagnosis of ICC system. Is “DTC 104 LASER AIMING INCMP” indicated?
CAUTION:
Ensure that laser beam aiming apparatus is set up accurately.
YES or NO
YES >> • Replace ICC sensor and adjust laser beam aiming. Refer to ACS-55, "ICC Sensor".
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
NO >> Inspection end.
DTC 107 LASER COMM FAILINFOID:0000000003533812
1.DIAGNOSTIC CHECK
Is “DTC 11 CONTROL UNIT” or “DTC 20 CAN COMM CIRCUIT” indicated in the self-diagnosis display item?
YES or NO
YES >> GO TO applicable item inspection. Refer to ACS-36, "DTC 11 CONTROL UNIT" , or ACS-37,
"DTC 20 CAN COMM CIRCUIT".
NO >> • Replace ICC sensor and adjust laser beam aiming. Refer to ACS-55, "
ICC Sensor".
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
DTC 109 LASER HIGH TEMPINFOID:0000000003533813
1.CHECK SYMPTOM
Is cooling system malfunctioning?
YES or NO
YES >> • Repair cooling system.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
NO >> • Replace ICC sensor and adjust laser beam aiming. Refer to ACS-55, "
ICC Sensor".
• Erase DTC, then perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.

TROUBLE DIAGNOSIS FOR SYMPTOMS
ACS-49
< SERVICE INFORMATION >[ICC]
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TROUBLE DIAGNOSIS FOR SYMPTOMS
Symptom ChartINFOID:0000000003533814
Symptom 1 ON/OFF Switch Does Not Switch ON*1, ON/OFF Switch Does Not Switch
OFF
*2INFOID:0000000003533815
NOTE:
• *1: The ICC system display in the combination meter does not illuminate.
• *2: The ICC system display in the combination meter remains powered.
1.CHECK ON/OFF SWITCH
With CONSULT-II
• With "DATA MONITOR" on the CONSULT-II, check that ON/OFF switch operates normally.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
Symptoms Reference page
OperationON/OFF switch does not switch ON.Symptom 1
ACS-49
ON/OFF switch does not switch OFF.Symptom 1
ACS-49
Cruise does not function for setting (powering functions).Symptom 2
ACS-50
CANCEL switch does not function.Symptom 3
ACS-51
RESUME does not function.Symptom 3
ACS-51
The set speed does not increase.Symptom 3
ACS-51
The set distance to the vehicle ahead cannot be changed.Symptom 3
ACS-51
The ICC is not cancelled when the gear is in "N".Symptom 4
ACS-51
Display/ChimeThe ICC system display does not appear.Check combination meter. Refer to
DI-15, "
How to Proceed with Trou-
ble Diagnosis"
Chime does not function.Symptom 5
ACS-51
Control Driving force is hunting.Symptom 6
ACS-52
Function to detect the vehicle
aheadThe system frequently cannot detect the vehicle ahead.Symptom 7
ACS-52
The distance to detect the vehicle ahead is short.Symptom 7
ACS-52
The system misidentifies a vehicle even though there is no ve-
hicle ahead.• Refer toACS-12
• Refer to ACS-9, "
ICC System
Running Test"
The system misidentifies a vehicle in the next lane.• Refer to ACS-12• Refer to ACS-9, "ICC System
Running Test"
The system does not detect a vehicle at all.Symptom 8
ACS-53

ACS-50
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SYMPTOMS
2.CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors.
3. Check connector housing for disconnected, loose, bent, and collapsed terminals.
OK or NG
OK >> GO TO 3.
NG >> • Poor connector connection.
• Repair ICC unit connector. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test". Then perform self-diagnosis of ICC system again.
3.DIAGNOSIS CHECK
With CONSULT-II
• Perform self-diagnosis with CONSULT-II. Is “CAN COMM CIRCUIT” indicated?
YES or NO
YES >> Refer to ACS-37, "DTC 20 CAN COMM CIRCUIT".
NO >> Refer to ACS-40, "
DTC 46 OPERATION SW CIRC".
Symptom 2 the ICC System Cannot Be Set (ON/OFF Switch Turns On/Off)
INFOID:0000000003533816
The ICC cannot be set in the following cases.• When the vehicle speed is not in range of approx. 40 km/h (25 MPH) to 144 km/h (89 MPH).
• When the selector lever is in "N".
• While the brake is in operation.
• When the windshield wipers are operating.
1.CHECK CAUSE OF AUTOMATIC CANCELLATION
With CONSULT-II
1. With “CAUSE OF AUTO-CANCEL” in "WORK SUPPORT" on CONSULT-II, check if any cause of cancel-
lation exists.
OK or NG
OK >> • Cancel with appropriate cause.
• For causes A, B, or C, go to specified diagnosis.
A: “OPE SW VOLT CIRC” : Refer to ACS-40, "
DTC 46 OPERATION SW CIRC".
B: “VHCL SPD UNMATCH” : Refer to ACS-38, "
DTC 41 VHCL SPEED SE CIRC".
C: “IGN LOW VOLT” : Refer to ACS-37, "
DTC 31 POWER SUPPLY CIR1, DTC 34
POWER SUPPLY CIR2".
NG >> GO TO 2.
2.PERFORM SELF-DIAGNOSIS
With CONSULT-II
1. Perform CONSULT-II self-diagnosis to check for malfunctioning items.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace as necessary, erase DTC. Perform ICC system running test. Refer to ACS-9,
"ICC System Running Test". Then perform self-diagnosis of ICC system again.
3.CHECK SWITCHES AND VEHICLE SPEED SIGNAL
With CONSULT-II
1. With "DATA MONITOR" on the CONSULT-II, check that the following switches and vehicle speed signal
operate normally.
A: VHCL SPEED SE B: NP RANGE SW
C: BRAKE SW D: SET/COAST SW
OK or NG
OK >> Replace ICC unit and erase DTC. Refer to ACS-55, "ICC Unit". Perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
NG >> • A: Refer to ACS-38, "
DTC 41 VHCL SPEED SE CIRC".

TROUBLE DIAGNOSIS FOR SYMPTOMS
ACS-51
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• B: Refer to ACS-51, "Symptom 4 the ICC System Is Not Cancelled When the Gear Is in ‘N’".
• C: Refer to ACS-38, "
DTC 45 BRAKE SW/STOP L SW".
• D: Refer to ACS-40, "
DTC 46 OPERATION SW CIRC".
Symptom 3 the ICC System Cannot Be Operated by the CANCEL Switch, ACCEL/
RES Switch, or DISTANCE Switch
INFOID:0000000003533817
RESUME will not function in the following cases:
• When ON/OFF switch is pressed once after the ICC system was ON.
• When the vehicle speed is less than 32 km/h (20 MPH).
1.CHECK SWITCH
With CONSULT-II
1. With "DATA MONITOR" on the CONSULT-II, check that the following switches operate normally.
“RESUME/ACC SW”, “CANCEL SW”, “DISTANCE ADJ”.
OK or NG
OK >> Replace ICC unit and erase DTC. Refer to ACS-55, "ICC Unit". Perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
NG >> GO TO 2.
2.CHECK DIAGNOSIS
With CONSULT-II
• Perform self-diagnosis with CONSULT-II. Is “CAN COMM CIRCUIT” indicated?
YES or NO
YES >> Refer to ACS-37, "DTC 20 CAN COMM CIRCUIT".
NO >> Refer to ACS-40, "
DTC 46 OPERATION SW CIRC".
Symptom 4 the ICC System Is Not Cancelled When the Gear Is in ‘N’INFOID:0000000003533818
1.CHECK D RANGE SWITCH
With CONSULT-II
1. With "DATA MONITOR" on the CONSULT-II, check that “NP RANGE SW” operates normally.
OK or NG
OK >> Replace ICC unit and erase DTC. Refer to ACS-55, "ICC Unit". Perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
NG >> GO TO 2.
2.CHECK CAN COMMUNICATION
With CONSULT-II
1. With CONSULT-II self-diagnosis, check “CAN COMM CIRCUIT”.
OK or NG
OK >> GO TO 3.
NG >> Refer to ACS-37, "
DTC 20 CAN COMM CIRCUIT".
3.CHECK NP RANGE SWITCH
1. With "DATA MONITOR" on the CONSULT-II, check that “N” position switch operates normally.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55, "ICC Unit". Perform ICC system running test. Refer to ACS-9,
"ICC System Running Test". Then perform self-diagnosis of ICC system again.
NG >> Repair or replace as necessary. Perform ICC system running test. Refer to ACS-9, "
ICC System
Running Test". Then perform self-diagnosis of ICC system again.
Symptom 5 Chime Does Not SoundINFOID:0000000003533819
The chime may not sound occasionally in the following cases even if the distance from the vehicle ahead is
short:
• When the speed difference from that of the vehicle ahead is small (both vehicles driving at similar speed).
• When the vehicle ahead drives at faster speed (the actual distance is increasing).

ACS-52
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SYMPTOMS
• When depressing the accelerator.
• Chime does not sound when the vehicle is not driving.
• Chime does not sound when the system does not detect any vehicle ahead. Diagnose the conditions under
which the system is detecting the vehicle ahead and when the system is malfunctioning. If there is any mal-
function in detecting the vehicle ahead. Refer to ACS-52, "
Symptom 7 the ICC System Frequently Cannot
Detect the Vehicle Ahead/The Detection Zone Is Short".
1.CHECK ICC WARNING CHIME
With CONSULT-II
1. With "ACTIVE TEST" on the CONSULT-II, check that ICC warning chime operates normally.
OK or NG
OK >> Determine preceding vehicle detection status when malfunction occurred. If chime should have
sounded replace ICC unit. Refer to ACS-55, "
ICC Unit". Perform ICC system running test. Refer
to ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
NG >> GO TO 2.
2.CAN COMMUNICATION INSPECTION
With CONSULT-II
1. With CONSULT-II self-diagnosis, check “CAN COMM CIRCUIT”.
OK or NG
OK >> Refer to ACS-37, "DTC 20 CAN COMM CIRCUIT".
NG >> Replace combination meter. Refer to DI-21, "
Removal and Installation of Combination Meter".
Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
Symptom 6 Driving Force Is HuntingINFOID:0000000003533820
1.CHECK ECM
1. Perform self-diagnosis of ECM.
OK or NG
OK >> Refer to ACS-52, "Symptom 7 the ICC System Frequently Cannot Detect the Vehicle Ahead/The
Detection Zone Is Short".
NG >> Repair as necessary. Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC
System Running Test". Then perform self-diagnosis of ICC system again.
Symptom 7 the ICC System Frequently Cannot Detect the Vehicle Ahead/The Detec-
tion Zone Is Short
INFOID:0000000003533821
The detection function may become disrupted in the following cases:
• When the reflector of the vehicle ahead is small or not clean enough to reflect the laser.
• When driving a road with extremely sharp corners.
• When the laser cannot detect the reflector of the vehicle ahead as the vehicle ahead is passing a hill or
passing the peak.
1.VISUAL CHECK
1. Check ICC sensor body window for contamination and foreign materials.
OK or NG
OK >> If any contamination or foreign materials are found, remove them. Then perform ICC system run-
ning test. Refer to ACS-9, "
ICC System Running Test".
NG >> GO TO 2.
2.CHECK FUNCTION
1. After performing laser beam aiming adjustment, perform ICC system running test. Refer to ACS-9, "
ICC
System Running Test". Check that preceding vehicle detection performance has been improved.
OK or NG
OK >> Inspection End.
NG >> • Replace ICC sensor and perform laser beam aiming adjustment. Refer to ACS-55, "
ICC Sen-
sor".

TROUBLE DIAGNOSIS FOR SYMPTOMS
ACS-53
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• Perform ICC system running test. Refer to ACS-9, "ICC System Running Test" . Then perform
self-diagnosis of ICC system again.
Symptom 8 the System Does Not Detect the Vehicle Ahead at AllINFOID:0000000003533822
1.VISUAL CHECK
1. With ignition switch turned ON (engine not started), check that all indicator lamps in ICC system display
are continuously lit. (Check for a missing segment in preceding vehicle detection display.)
OK or NG
OK >> GO TO 2.
NG >> Check combination meter. Refer to DI-15, "
How to Proceed with Trouble Diagnosis".
2. VISUAL CHECK
• Check ICC sensor body window for contamination and foreign materials.
OK or NG
OK >> If any contamination or foreign materials are found, remove them. Perform ICC system running
test. Refer to ACS-9, "
ICC System Running Test".
NG >> GO TO 3.
3.VISUAL CHECK
• Check ICC sensor body window for cracks and scratches.
OK or NG
OK >> GO TO 4.
NG >> • Replace ICC sensor and perform laser beam aiming adjustment. Refer to ACS-55, "
ICC Sen-
sor".
• Perform ICC system running test. Refer to ACS-9, "
ICC System Running Test". Then perform
self-diagnosis of ICC system again.
4.ADJUST ICC SENSOR
• After performing laser beam aiming adjustment, perform ICC system running test. Refer to ACS-9, "
ICC Sys-
tem Running Test". Check that preceding vehicle detection performance has been improved.
OK or NG
OK >> Inspection End.
NG >> • Replace ICC sensor and perform laser beam aiming adjustment. Refer to ACS-55, "
ICC Sen-
sor".
• Perform ICC system running test. Refer to ACS-9, "
ICC System Running Test". Then perform
self-diagnosis of ICC system again.

ACS-54
< SERVICE INFORMATION >[ICC]
ELECTRICAL COMPONENT INSPECTION
ELECTRICAL COMPONENT INSPECTION
ICC Steering SwitchINFOID:0000000003533823
1. Disconnect ICC steering switch.
2. Check resistance between terminals 14 and 15 while depressing
each switch.
ICC Brake Switch and Stop Lamp SwitchINFOID:0000000003533824
Check each switch after adjusting brake pedal. Refer to BR-5.
Parking Brake SwitchINFOID:0000000003533825
ICC Steering Switch (A) ConditionResistance [Ω]
(Approx.)
ON/OFF Depressed 0
Released 5,456
DISTANCE Depressed 741
Released 5,456
ACCEL/RES Depressed 2,586
Released 5,456
COAST/SET Depressed 1,406
Released 5,456
CANCEL Depressed 309
Released 5,456
WKIA4573E
Continuity
ICC brake switch Stop lamp switch
When brake pedal is depressed No Yes
When brake pedal is released Yes No
WKIA3405E
Continuity to ground
Parking brake pedal depressed Yes
Parking brake pedal released No
WKIA1918E

REMOVAL AND INSTALLATION
ACS-55
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REMOVAL AND INSTALLATION
ICC UnitINFOID:0000000003533826
ICC SensorINFOID:0000000003533827
CAUTION:
Perform the laser beam aiming procedure every time the ICC sensor is removed or installed. Refer to
ACS-12
.
ICC Steering SwitchINFOID:0000000003533828
Replace ICC steering switch as switch kit assembly. Refer to AV-46, "Removal and Installation" .
1. Rear inner side panel LH (shown
with finisher removed)2. ICC unit harness connector 3. ICC unit
⇐Vehicle front
WKIA4607E
1. ICC sensor bracket 2. ICC frame bracket 3. ICC sensor
4. Frame side rail⇐Vehicle front
WKIA4608E

AP-1
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SECTION AP
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CONTENTS
ADJUSTABLE PEDAL
SERVICE INFORMATION ............................2ADJUSTABLE PEDAL SYSTEM .......................2
Adjustable Pedal .......................................................2

AP-2
< SERVICE INFORMATION >
ADJUSTABLE PEDAL SYSTEM
SERVICE INFORMATION
ADJUSTABLE PEDAL SYSTEM
Adjustable PedalINFOID:0000000003533216
For adjustable pedal information, refer to SE-11 .