INFINITI QX56 2004 Factory Repair Manual

ACS-52
[ICC]
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: August 20072004 QX56
TROUBLE DIAGNOSIS FOR SYMPTOMSPFP:00007
Symptom ChartEKS007XR
Symptoms Reference page
OperationON/OFF switch does not switch ON.Symptom 1
ACS-53
ON/OFF switch does not switch OFF.Symptom 1
ACS-53
Cruise does not function for setting (powering functions).Symptom 2
ACS-53
CANCEL switch does not function.Symptom 3
ACS-54
RESUME does not function.Symptom 3
ACS-54
The set speed does not increase.Symptom 3
ACS-54
The set distance to the vehicle ahead cannot be changed.Symptom 3
ACS-54
The ICC is not cancelled when the gear is in other than D.Symptom 4
ACS-55
Display/ChimeThe ICC system display does not appear.Check combination meter.
Refer to DI-17, "
How to Pro-
ceed With Trouble Diagnosis"
Chime does not function.Symptom 5
ACS-55
Control Driving force is hunting.Symptom 6
ACS-56
Function to detect the vehicle
aheadThe system frequently cannot detect the vehicle ahead.Symptom 7
ACS-56
The distance to detect the vehicle ahead is short.Symptom 7
ACS-56
The system misidentifies a vehicle even though there is no
vehicle ahead.

Refer to ACS-12, "LASER
BEAM AIMING ADJUST-
MENT"

Refer to ACS-9, "ICC Sys-
tem Running Test"
The system misidentifies a vehicle in the next lane.

Refer to ACS-12, "LASER
BEAM AIMING ADJUST-
MENT"

Refer to ACS-9, "ICC Sys-
tem Running Test"
The system does not detect a vehicle at all.Symptom 8
ACS-56

TROUBLE DIAGNOSIS FOR SYMPTOMS
ACS-53
[ICC]
C
D
E
F
G
H
I
J
L
MA
B
ACS
Revision: August 20072004 QX56
Symptom 1: ON/OFF Switch Does Not Switch ON*1 , ON/OFF Switch Does Not
Switch OFF
*2EKS007XS
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, check that ON/OFF switch operates normally.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
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. After repair, erase DTC and perform 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-38, "DTC 20 CAN COMM CIRCUIT" .
NO >> Refer to ACS-41, "
DTC 46 OPERATION SW CIRC" .
Symptom 2: The ICC System Cannot Be Set (ON/OFF Switch Turns On/Off)EKS007XT
The ICC cannot be set in the following cases.

When the vehicle speed is not in range of approx. 25 MPH (40 km/h) to 89 MPH (144 km/h).

When the A/T selector lever is in gears other than "D".

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, check if any cause of cancellation 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-41, "
DTC 46 OPERATION SW CIRC" .
B: “VHCL SPD UNMATCH” : Refer to ACS-39, "
DTC 41 VHCL SPEED SE CIRC" .
C: “IGN LOW VOLT” : Refer to ACS-38, "
DTC 31 POWER SUPPLY CIR 1, DTC 34
POWER SUPPLY CIR 2" .
NG >> GO TO 2.

ACS-54
[ICC]
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: August 20072004 QX56
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 >> After repairing or replacing malfunctioning part, erase DTC. Perform ICC system running test, and
then perform self-diagnosis of ICC system again.
3. CHECK SWITCHES AND VEHICLE SPEED SIGNAL
With CONSULT-II
1. With data monitor, check that the following switches and vehicle speed signal operate normally.
A: VHCL SPEED SE B: D RANGE SW
C: BRAKE SW D: SET/COAST SW
OK or NG
OK >> Replace ICC unit and erase DTC. Refer to ACS-59, "ICC Unit" . Perform ICC system running
test, and then perform self-diagnosis of ICC system again.
NG >>

A: Refer to ACS-39, "DTC 41 VHCL SPEED SE CIRC" .

B: Refer to ACS-55, "Symptom 4: The ICC System Is Not Cancelled When the Gear Is in Other
Than ‘D’" .

C: Refer to ACS-40, "DTC 45 BRAKE SW/STOP L SW" .

D: Refer to ACS-41, "DTC 46 OPERATION SW CIRC" .
Symptom 3: The ICC System Cannot Be Operated by the CANCEL Switch,
ACCEL/RES Switch, or DISTANCE Switch
EKS007XU
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 20 MPH (32 km/h).
1. CHECK SWITCH
With CONSULT-II
1. With data monitor, 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-59, "ICC Unit" . Perform ICC system running
test, and 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-38, "DTC 20 CAN COMM CIRCUIT" .
NO >> Refer to ACS-41, "
DTC 46 OPERATION SW CIRC" .

TROUBLE DIAGNOSIS FOR SYMPTOMS
ACS-55
[ICC]
C
D
E
F
G
H
I
J
L
MA
B
ACS
Revision: August 20072004 QX56
Symptom 4: The ICC System Is Not Cancelled When the Gear Is in Other Than
‘D’
EKS007XV
1. CHECK D RANGE SWITCH
With CONSULT-II
1. With data monitor, check that “D RANGE SW” operates normally.
OK or NG
OK >> Replace ICC unit and erase DTC. Refer to ACS-59, "ICC Unit" . Perform ICC system running
test, and 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-38, "
DTC 20 CAN COMM CIRCUIT" .
3. CHECK D RANGE SWITCH
1. With TCM data monitor, check that “D” position switch operates normally.
OK or NG
OK >> Replace ICC unit. Refer to ACS-59, "ICC Unit" . Perform ICC system running test, and then per-
form self-diagnosis of ICC system again.
NG >> After repairing or replacing malfunctioning part. Perform ICC system running test, and then per-
form self-diagnosis of ICC system again.
Symptom 5: Chime Does Not SoundEKS007XW
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).

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 malfunction in detecting the vehicle ahead, refer to ACS-56, "
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, 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-59, "
ICC Unit" . Perform ICC system running test, and
then perform self-diagnosis of ICC system again.
NG >> GO TO 2.

ACS-56
[ICC]
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: August 20072004 QX56
2. CAN COMMUNICATION INSPECTION
With CONSULT-II
1. With CONSULT-II self-diagnosis, check “CAN COMM CIRCUIT”.
OK or NG
OK >> Refer to ACS-38, "DTC 20 CAN COMM CIRCUIT" .
NG >> Replace combination meter and erase DTC. Refer to DI-25, "
Removal and Installation of Combi-
nation Meter" . Perform ICC system running test, and then perform self-diagnosis of ICC system
again.
Symptom 6: Driving Force Is HuntingEKS007XX
1. CHECK ECM
1. Perform self-diagnosis of ECM.
OK or NG
OK >> Refer to ACS-56, "Symptom 7: The ICC System Frequently Cannot Detect the Vehicle Ahead/The
Detection Zone is Short" .
NG >> After repairing applicable parts, erase DTC. Perform ICC system running test, and then perform
self-diagnosis of ICC system again.
Symptom 7: The ICC System Frequently Cannot Detect the Vehicle Ahead/The
Detection Zone is Short
EKS007XY
The detection function may become unstable 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.
NG >> GO TO 2.
2. CHECK FUNCTION
1. After performing laser beam aiming adjustment, perform 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-59, "ICC Sen-
sor" .

After performing above, perform ICC system running test, and then perform self-diagnosis of
ICC system again.
Symptom 8: The System Does Not Detect the Vehicle Ahead at AllEKS007XZ
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-17, "
How to Proceed With Trouble Diagnosis" .

TROUBLE DIAGNOSIS FOR SYMPTOMS
ACS-57
[ICC]
C
D
E
F
G
H
I
J
L
MA
B
ACS
Revision: August 20072004 QX56
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-59, "ICC Sen-
sor" .

After performing above, perform ICC system running test, and then perform self-diagnosis of
ICC system again.
4. ADJUST ICC SENSOR

After performing laser beam aiming adjustment, perform 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-59, "ICC Sen-
sor" .

After performing above, perform ICC system running test, and then perform self-diagnosis of
ICC system again.

ACS-58
[ICC]
ELECTRICAL COMPONENT INSPECTION
Revision: August 20072004 QX56
ELECTRICAL COMPONENT INSPECTIONPFP:00000
ICC Steering SwitchEKS007TT
1. Disconnect ICC steering switch.
2. Check resistance between M102 terminals 14 and 15 while
depressing each switch.
ICC Brake Switch and Stop Lamp SwitchEKS007TU
Check each switch after adjusting brake pedal. Refer to BR-6,
"BRAKE PEDAL" .
Parking Brake SwitchEKS007TX
Switch 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
WKIA1916E
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-59
[ICC]
C
D
E
F
G
H
I
J
L
MA
B
ACS
Revision: August 20072004 QX56
REMOVAL AND INSTALLATIONPFP:00000
ICC UnitEKS007TO
ICC SensorEKS007TP
CAUTION:
Perform the laser beam aiming procedure every time the ICC sensor is removed or installed.
ICC Steering SwitchEKS007TQ
Replace ICC steering switch as switch kit assembly. Refer to AV-47, "Removal and Installation of Steering
Wheel Audio Control Switches" .
WKIA1914E
WKIA1915E

ACS-60
[ICC]
REMOVAL AND INSTALLATION
Revision: August 20072004 QX56

AP-1
ADJUSTABLE PEDAL
I BODY
CONTENTS
C
D
E
F
G
H
J
K
L
M
SECTION AP
A
B
AP
Revision: August 20072004 QX56 ADJUSTABLE PEDAL SYSTEM ............................... 2
Adjustable Pedal ...................................................... 2