2007 INFINITI QX56 service

ACS-42
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
4.CHECK ICC BRAKE SWITCH
Check ICC brake switch. Refer to ACS-54, "
ICC Brake Switch and Stop Lamp Switch" .
OK or NG
OK >> GO TO 5.
NG >> Replace ICC brake switch. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test". Then perform self-diagnosis of ICC system again.
5.CHECK ICC BRAKE HOLD RELAY
Disconnect ICC brake hold relay and check continuity between ICC
brake hold relay terminal 4 and terminal 3.
OK or NG
OK >> GO TO 6.
NG >> Replace ICC brake hold relay. Erase DTC and perform
ICC system running test. Refer to ACS-9, "
ICC System
Running Test". Then perform self-diagnosis of ICC sys-
tem again.
6.CHECK HARNESS THROUGH ICC BRAKE HOLD RELAY, ICC BRAKE SWITCH, ICC UNIT
1. Disconnect ECM and ICC unit harness connectors.
2. Check continuity between ICC brake hold relay harness connec-
tor E134 terminal 4 and ICC unit harness connector B17 termi-
nal 29.
3. Check continuity between ICC unit harness connector B17 ter-
minal 29 and ground.
OK or NG
OK >> GO TO 7.
NG >> • Repair harness between ICC brake hold relay and ICC brake switch.
• Repair harness between ICC brake switch and ICC unit.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
7.CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between ICC brake hold relay harness connector
E134 terminal 3 and ground.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55, "ICC Unit". Erase
DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test". Then perform self-
diagnosis of ICC system again.
NG >> • Check fuse or ICC brake hold relay power supply sys-
tem harness.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
8.CHECK STOP LAMP SWITCHContinuity should exist.
SKIA6658E
Continuity should exist.
Continuity should not exist.
WKIA1929E
Battery voltage should exist
WKIA3618E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-43
< SERVICE INFORMATION >[ICC]
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1. Turn ignition switch OFF.
2. Check stop lamp switch. Refer to ACS-54, "
ICC Brake Switch and Stop Lamp Switch" .
OK or NG
OK >> GO TO 9.
NG >> Replace stop lamp switch. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test". Then perform self-diagnosis of ICC system again.
9.CHECK ICC BRAKE HOLD RELAY CIRCUIT
1. Disconnect stop lamp switch connector.
2. When brake pedal is not depressed, make sure that stop lamp does not illuminate.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55, "ICC Unit". Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
NG >> GO TO 10.
10.CHECK ICC BRAKE HOLD RELAY
1. Disconnect ICC brake hold relay.
2. Check continuity between ICC brake hold relay E134 terminal 7
and terminal 6.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55, "ICC Unit". Erase
DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test". Then perform self-
diagnosis of ICC system again.
NG >> Replace ICC brake hold relay. Erase DTC and perform
ICC system running test. Refer to ACS-9, "
ICC System Running Test". Then perform self-diagno-
sis of ICC system again.
11 . CHECK HARNESS THROUGH ICC UNIT, ICC BRAKE HOLD RELAY, AND GROUND
1. Disconnect ICC unit and ICC brake hold relay harness connec-
tors.
2. Check continuity between ICC unit harness connector B17 ter-
minal 47 and ICC brake hold relay harness connector E134 ter-
minal 1.
3. Check continuity between ICC unit harness connector B17 ter-
minal 47 and ground.
4. Check continuity between ICC brake hold relay harness connec-
tor E134 terminal 2 and ground.
OK or NG
OK >> GO TO 12.
NG >> • Repair harness through ICC unit and ICC brake hold
relay, or between ICC brake hold relay and ground.
• Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test". Then
perform self-diagnosis of ICC system again.
12.CHECK ICC BRAKE HOLD RELAY Continuity should not exist.
SKIA6659E
47 - 1 Continuity should exist.
47 - Ground Continuity should not exist.
SKIA6660E
Continuity should exist.
SKIA6661E

ACS-44
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Check continuity between ICC brake hold relay terminal 1 and termi-
nal 2.
OK or NG
OK >> GO TO 13.
NG >> Replace ICC brake hold relay. Erase DTC and perform
ICC system running test. Refer to ACS-9, "
ICC System
Running Test". Then perform self-diagnosis of ICC sys-
tem again.
13.CHECK ICC UNIT STANDARD VOLTAGE
With CONSULT-II
1. Connect connectors of ICC unit and stop lamp switch.
2. While performing active test (STOP LAMP: STP LMP DRIVE
ON) with CONSULT-II, check voltage between ICC unit harness
connector B17 terminal 47 and ground.
OK or NG
OK >> GO TO 14.
NG >> Replace ICC unit. Refer to ACS-55, "
ICC Unit". Erase
DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC system again.
14.CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
Check voltage between ICC brake hold relay harness connector
E134 terminal 6 and ground.
OK or NG
OK >> GO TO 15.
NG >> • Check fuse or ICC brake hold relay power supply har-
ness.
• Erase DTC and perform ICC system running test.
Refer to ACS-9, "
ICC System Running Test". Then
perform self-diagnosis of ICC system again.
15.CHECK HARNESS BETWEEN ICC BRAKE HOLD RELAY AND ICC UNIT
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors.
3. Check continuity between ICC brake hold relay harness connec-
tor E134 terminal 7 and ICC unit harness connector B17 termi-
nal 38.
4. Check continuity between ICC unit harness connector B17 ter-
minal 38 (R/G) and ground.
OK or NG
OK >> GO TO 16.
NG >> • Repair harness between ICC brake hold relay and ICC unit or between ICC brake hold relay
and stop lamp switch. Continuity should exist
(minimal resistance through coil will exist)
SKIA6662E
47 - Ground Battery voltage should exist
(during active test)
SKIA3075E
6 - Ground Battery voltage should exist
WKIA1931E
7 - 38 Continuity should exist.
38 - Ground Continuity should not exist.
WKIA1932E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-45
< SERVICE INFORMATION >[ICC]
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• Erase DTC and perform ICC system running test. Refer to ACS-9, "ICC System Running Test".
Then perform self-diagnosis of ICC system again.
16.CHECK ICC BRAKE HOLD RELAY
With CONSULT-II
1. Connect ICC unit and ICC brake hold relay harness connectors.
2. Disconnect stop lamp switch connector.
3. Perform active test (STOP LAMP) with CONSULT-II, and make sure that stop lamps are illuminated.
OK or NG
OK >> GO TO 17.
NG >> Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Refer to ACS-9,
"ICC System Running Test". Then perform self-diagnosis of ICC system again.
17.CHECK ICC UNIT STANDARD VOLTAGE
With CONSULT-II
1. Connect stop lamp switch connector.
2. While performing active test (STOP LAMP: STP LMP DRIVE
ON) with CONSULT-II, check voltage between ICC unit harness
connector B17 terminal 29 and ground.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55, "ICC Unit". Erase
DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test". Then perform self-
diagnosis of ICC system again.
NG >> Replace stop lamp switch. 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 92 ECM CIRCUITINFOID:0000000003533805
1.DIAGNOSIS CHECK 1
With CONSULT-II
Perform self-diagnosis with CONSULT-II. Is “CAN COMM CIRCUIT” indicated?
YES or NO
YES >> Repair or replace 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.
NO >> GO TO 2.
2.DIAGNOSIS CHECK 2
With CONSULT-II
Perform ECM self-diagnosis with CONSULT-II. Is malfunction indicated?
YES or NO
YES >> Repair or replace 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.
NO >> Replace ICC unit. Refer to ACS-55, "
ICC Unit". 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 96 NP RANGEINFOID:0000000003533806
1.CHECK ICC UNIT CONNECTORS
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors and connect them securely again. Erase DTC, then perform self-
diagnosis of ICC system again.
OK or NG
OK >> GO TO 2.
NG >> • Poor connector connection.
29 - Ground Approx. 0V (during active test)
SKIA1200E

ACS-46
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
• Check connector. Check connector housing for disconnected, loose, bent, and collapsed termi-
nals. If any malfunction is detected, 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.
2.CHECK NP RANGE SWITCH SIGNAL
With CONSULT-II
With data monitor, check that “NP RANGE SW” operates normally.
OK or NG
OK >> Perform TCM diagnosis. Refer to AT-83, "CONSULT-II Function (A/T)".
NG >> GO TO 3.
3.CHECK HARNESS BETWEEN ICC UNIT AND TCM
1. Turn ignition switch OFF.
2. Disconnect ICC unit harness connectors and A/T assembly har-
ness connector.
3. Check continuity between ICC unit harness connector B13 ter-
minal 7 and A/T assembly harness connector F9 terminal 9.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55, "ICC Unit". Erase
DTC and perform ICC system running test. Refer to
ACS-9, "
ICC System Running Test". Then perform self-
diagnosis of ICC system again.
NG >> • Repair harness between ICC unit and TCM.
• 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 97 AT CIRCUITINFOID:0000000003533807
1.CHECK A/T CIRCUIT
With CONSULT-II
With TCM diagnosis, check that shift operates normally. Refer to AT- 9 9
.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55, "ICC Unit". Erase DTC and perform self-diagnosis of ICC sys-
tem again.
NG >> • Perform TCM diagnosis.
• Erase DTC and perform self-diagnosis of ICC system again.
DTC 98 GEAR POSITIONINFOID:0000000003533808
1.DIAGNOSTIC CHECK
With CONSULT-II
Is “DTC 43 VDC/TCS/ABS CIRC” or “DTC 41 VHCL SPEED SE CIRC” indicated in self-diagnosis display
item?
YES or NO
YES >> Repair or replace as necessary. Erase DTC and perform self-diagnosis of ICC system again.
NO >> GO TO 2.
2.CHECK VEHICLE SPEED SIGNAL
With CONSULT-II
With data monitor, check that “VHCL SPEED SE” is normal.
OK or NG
OK >> GO TO 3.
NG >> Replace ICC unit. Refer to ACS-55, "
ICC Unit". Erase DTC and perform self-diagnosis of ICC sys-
tem again.
7 - 9 Continuity should exist.
SKIA5982E

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-47
< SERVICE INFORMATION >[ICC]
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3.CHECK GEAR SHIFT POSITION
Check that gear positions are correct in A/T.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.CHECK TCM GEAR POSITION SIGNAL
With CONSULT-II
With TCM data monitor on CONSULT-II, check that gear positions are correct.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55, "ICC Unit". Erase DTC and perform self-diagnosis of ICC sys-
tem again.
NG >> • Perform TCM diagnosis.
• Erase DTC and perform self-diagnosis of ICC system again.
5.CHECK TCM TURBINE ROTATION
With CONSULT-II
With TCM diagnosis, check that turbine rpm is normal. Refer to AT-103
.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55, "ICC Unit". Erase DTC and perform self-diagnosis of ICC sys-
tem again.
NG >> • Perform TCM diagnosis.
• Erase DTC and perform self-diagnosis of ICC system again.
DTC 102 LASER STAININFOID:0000000003533809
1.VISUAL INSPECTION (1)
Check that there is no contamination and foreign material on ICC sensor body window.
OK or NG
OK >> GO TO 2.
NG >> • Clean 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.
2.VISUAL INSPECTION (2)
Check ICC sensor body window for cracks.
OK or NG
OK >> GO TO 3.
NG >> • Replace ICC sensor and adjust laser beam. Refer to ACS-12
.
• 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.ASK CUSTOMER FOR DRIVING CONDITIONS
1. Is there any trace of contamination or foreign material on ICC sensor?
2. Is there any possibility that vehicle was driven in snow or ICC sensor was frosted?
3. Is there any possibility that ICC sensor was fogged temporarily? (Front window glass may have also been
fogged.)
Ye s o r N o
Yes >> Explain system operation and parameters to customer. System may be operating normally.
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 103 LASER SENSOR FAILINFOID:0000000003533810
1.DIAGNOSTIC CHECK

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
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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