INFINITI QX56 2009 Factory Service Manual

CCS-20
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (ICC SENSOR INTEGRATED UNIT)
BRAKE SW
[On/Off] ××
Indicates [On/Off] status as judged from ICC brake switch signal (ECM trans-
mits ICC brake switch signal through CAN communication).
STOP LAMP SW
[On/Off] ××Indicates [On/Off] status as judged from stop lamp switch signal (ECM trans-
mits stop lamp switch signal through CAN communication).
CRUISE LAMP
[On/Off] ××
Indicates [On/Off] status of MAIN switch indicator lamp output.
CLUTCH SW SIG
[On/Off] ××
NOTE:
This item is displayed, but cannot monitor.
NP SW SIG
[On/Off] ××Indicates [On/Off] status as judged from transmission range switch signal
(ECM transmits transmission range switch signal through CAN communica-
tion).
STP LMP DRIVE
[On/Off] ××
Indicates [On/Off] status of ICC brake hold relay drive output.
PWR SUP MONI
[V] ××
Indicates IGN voltage input by ICC sensor integrated unit.
IDLE SW
[On/Off] ×Indicates [On/Off] status of idle switch read from ICC sensor integrated unit
through CAN communication (ECM transmits On/Off status through CAN
communication).
OWN VHCL
[On/Off] ×
Indicates [On/Off] status of own vehicle indicator output.
VHCL AHEAD
[On/Off] ×
Indicates [On/Off] status of vehicle ahead detection indicator output.
ICC WARNING
[On/Off] ×
Indicates [On/Off] status of ICC system warning lamp output.
BUZZER O/P
[On/Off] ×
Indicates [On/Off] status of ICC warning chime output.
ENGINE RPM
[rpm] ×Indicates engine speed read from ICC sensor integrated unit through CAN
communication (ECM transmits engine speed through CAN communication).
WIPER SW
[OFF/LOW/HIGH] ×
Indicates wiper [OFF/LOW/HIGH] status (BCM transmits front wiper request
signal through CAN communication).
YAW R AT E
[deg/s] ×NOTE:
This item is displayed, but cannot monitor.
D RANGE SW
[On/Off] ×Indicates [On/Off] status of “D” or “DS” or “M” positions read from ICC sensor
integrated unit through CAN communication; ON when position “D” or “DS” or
“M” (TCM transmits shift position indicator lamp signal through CAN commu-
nication).
NP RANGE SW
[On/Off] ×Indicates shift position indicator lamp signal read from ICC sensor integrated
unit through CAN communication (TCM transmits shift position indicator lamp
signal through CAN communication).
VHCL SPD AT
[km/h] or [mph] ×Indicates vehicle speed calculated from A/T vehicle speed sensor read from
ICC sensor integrated unit through CAN communication (TCM transmits A/T
vehicle speed sensor signal through CAN communication).
GEAR
[1, 2, 3, 4, 5] ×Indicates A/T gear position read from ICC sensor integrated unit through CAN
communication (TCM transmits current gear position signal through CAN
communication).
MODE SIG
[OFF, ICC, ASCD] ×Indicates the active mode from ICC or ASCD [conventional (fixed speed)
cruise control mode].
SET DISP IND
[On/Off] ×
Indicates [On/Off] status of SET switch indicator output.
DISTANCE
[m] ×
Indic

ates the distance from the vehicle ahead.
RELATIVE SPD
[m/s] ×
Indicates the relative speed of the vehicle ahead.
Monitored Item [unit]
MAIN
SIGNALS SELECTION
FROM
MENU Description
Revision: December 20092009 QX56

CCS
DIAGNOSIS SYSTEM (ICC SENSOR INTEGRATED UNIT)
CCS-21
< FUNCTION DIAGNOSIS >
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ACTIVE TEST
NOTE:
• Never perform the active test while driving.
• “Active Test” cannot be started while ICC system warning lamp illuminates.
ECU IDENTIFICATION
Displays the part number of t he ICC sensor integrated unit.
Active test item Function
ICC BUZZER Activates/deactivates the ICC buzzer.
METER LAMP Turns ON/OFF the MAIN switch indicator and ICC system warning lamp.
NOTE:
Start the engine and perform active test.
STOP LAMP Drives the ICC brake hold relay and turns ON/OFF the stop lamp.
Revision: December 20092009 QX56

CCS-22
< COMPONENT DIAGNOSIS >
DTC 11 CONTROL UNIT
COMPONENT DIAGNOSIS
DTC 11 CONTROL UNIT
DTC 11 CONTROL UNITINFOID:0000000003776937
1.DIAGNOSTIC CHECK
Perform self diagnosis of the ICC system.
Are any items other than
“DTC 11 CONTROL UNIT” indicated on self-diagnosis display?
YES >> Repair or replace as necessary. Erase DT C and perform ICC system running test. Refer to CCS-
8, "ACTION TEST : ICC System Running Test" .
NO >> Replace ICC unit. Refer to CCS-70, "
ICC Unit". Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
Revision: December 20092009 QX56

CCS
DTC 12 VDC CONTROL UNITCCS-23
< COMPONENT DIAGNOSIS >
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DTC 12 VDC CONTROL UNIT
DTC 12 VDC CONTROL UNITINFOID:0000000003776938
1.DIAGNOSIS CHECK
Perform self-diagnosis of ABS actuator and electric unit (control unit).
Is malfunction indicated?
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to CCS-
8, "ACTION TEST : ICC System Running Test".
NO >> GO TO 2
2.CHECK CONNECTOR ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
1. Turn ignition switch OFF.
2. Disconnect ICC unit, and ABS act uator and electric unit (control unit) connectors, and connect them
securely again. Erase DTC, then perform self-diagnosis of ICC system again.
Does the DTC return?
YES >> Poor connector connection. Check connector hous ing for disconnected, loose, bent and collapsed
terminals. If any malfunction is detected, repa ir as necessary. Erase DTC and perform ICC sys-
tem running test. Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
NO >> GO TO 3
3.CHECK HARNESS BETWEEN ICC UNIT AND ABS AC TUATOR AND ELECTRIC UNIT (CONTROL UNIT)
1. Turn ignition switch OFF.
2. Disconnect ICC unit and ABS actuat or and electric unit (control
unit) connectors.
3. Check continuity between ICC unit harness connector B13 ter-
minal 10, and ABS actuator and electric unit (control unit) con-
nector E125 terminal 7.
Does continuity exist?
YES >> Replace ICC unit. Refer to CCS-70, "ICC Unit". Erase
DTC and perform ICC system running test. Refer to
CCS-8, "
ACTION TEST : ICC System Running Test".
NO >> • Repair harness between ICC unit, and ABS actuator and electric unit (control unit).
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
Continuity should exist.
WKIA3616E
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CCS-24
< COMPONENT DIAGNOSIS >
DTC 20 CAN COMM CIRCUIT
DTC 20 CAN COMM CIRCUIT
DTC 20 CAN COMM CIRCUITINFOID:0000000003776939
1.CHECK CAN COMMUNICATION
1. Perform self-diagnosis.
>> GO TO “CAN system”. Refer to LAN-4, "
System Description" .
Revision: December 20092009 QX56

CCS
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2
CCS-25
< COMPONENT DIAGNOSIS >
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DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2INFOID:0000000003776940
1.CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors and connect them secu rely again. Erase DTC, then perform self-diagno-
sis of ICC system again.
Does the DTC reset?
YES >> GO TO 2
NO >> • Poor connector connection. • Check connector. Check connector housing for disconnected, loose, bent, and collapsed termi-nals. If any malfunction is detected, repair as as necessary. Erase DTC and perform ICC system
running test. Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
2.CHECK POWER SUPPLY CIRCUIT FOR ICC UNIT
1. Turn ignition switch ON.
2. Check voltage between ICC unit harness connector B17 termi- nals 33, 42 and ground.
Does battery voltage exist?
YES >> GO TO 3
NO >> • Repair ICC unit power supply harness. • Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Run-
ning Test".
3.CHECK GROUND CIRCUIT FOR ICC UNIT
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors.
3. Check continuity between ICC unit harness connector B13 ter- minals 19, 20, and connector B17 terminal 46 and ground.
Does continuity exist?
YES >> Replace ICC unit. Refer to CCS-70, "ICC Unit" . Erase
DTC and perform ICC system running test. Refer to
CCS-8, "
ACTION TEST : ICC System Running Test" .
NO >> • Repair ICC unit ground harness.
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test" .
Battery voltage should exist.
SKIA1173E
Continuity should exist.
SKIA6650E
Revision: December 20092009 QX56

CCS-26
< COMPONENT DIAGNOSIS >
DTC 41 VHCL SPEED SE CIRC
DTC 41 VHCL SPEED SE CIRC
DTC 41 VHCL SPEED SE CIRCINFOID:0000000003776941
1.PERFORM ICC UNIT SELF-DIAGNOSIS
Perform self-diagnosis.
Is
“DTC 43 VDC/TCS/ABS CIRC” or “DTC 20 CAN COMM CIRCUIT” indicated in self-diagnosis item display?
YES >> Repair or replace as necessary. Erase DT C and perform ICC system running test. Refer to CCS-
8, "ACTION TEST : ICC System Running Test".
NO >> GO TO 2
2.CHECK A/T VEHICLE SPEED SENSOR
With data monitor, check “VHCL SPD AT”.
Does the data monitor item work normally?
YES >> Replace ICC unit. Refer to CCS-70, "ICC Unit". Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
NO >> • Check TCM. • Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test" .
Revision: December 20092009 QX56

CCS
DTC 43 VDC/TCS/ABS CIRCCCS-27
< COMPONENT DIAGNOSIS >
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DTC 43 VDC/TCS/ABS CIRC
DTC 43 VDC/TCS/ABS CIRCINFOID:0000000003776942
1.DIAGNOSIS CHECK 1
Perform self-diagnosis.
Is
“CAN COMM CIRCUIT” indicated?
YES >> Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to CCS-
8, "ACTION TEST : ICC System Running Test".
NO >> GO TO 2
2.DIAGNOSIS CHECK 2
Perform self-diagnosis of ABS actuator and electric unit (control unit).
Is malfunction indicated?
YES >> Repair the ABS system as necessary. Erase DTC and perform ICC system running test. Refer to
CCS-8, "
ACTION TEST : ICC System Running Test" .
NO >> Replace ICC unit. Refer to CCS-70, "
ICC Unit". Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
Revision: December 20092009 QX56

CCS-28
< COMPONENT DIAGNOSIS >
DTC 45 BRAKE SW/STOP L SW
DTC 45 BRAKE SW/STOP L SW
DTC 45 BRAKE SW/STOP L SWINFOID:0000000003776943
1.CHECK CONNECTORS FOR ICC UNIT
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors and connect them secu rely again. Erase DTC, then perform self-diagno-
sis of ICC system again.
Does the DTC reset?
YES >> • Poor connector connection. • Check connectors. Check connectors housing for disconnected, loose, bent, and collapsed ter-
minals. If any malfunction is detected, repair as necessary. Erase DTC and perform ICC system
running test. Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
NO >> GO TO 2
2.CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
With data monitor, check if “STOP LAMP SW” and “BRAKE SW” are operating normally.
Do the monitor items display properly?
YES >> Replace ICC unit. Refer to CCS-70, "ICC Unit". Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Running Test" .
NO >> • BRAKE SW: GO TO 3 • STOP LAMP SW: GO TO 5
3.ICC BRAKE SWITCH INSTALLATION AND ADJUSTMENT INSPECTION
Check ICC brake switch for proper installation and adjust if necessary.
Does ICC brake switch operate normally?
YES >> GO TO 4
NO >> After adjustment, erase DTC and perform ICC system running test. Refer to \
CCS-8, "
ACTION
TEST : ICC System Running Test" .
4.CHECK ICC BRAKE SWITCH
Check ICC brake switch.
Does the ICC brake switch check OK?
YES >> Replace ICC unit. Refer to CCS-70, "ICC Unit". Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
NO >> Replace ICC brake switch. Erase DTC and perform ICC system running test. Refer to CCS-8,
"ACTION TEST : ICC System Running Test".
5.CHECK STOP LAMP ILLUMINATION
Check stop lamp illumination.
Do the stop lamps operate normally?
YES >> GO TO 6
NO >> • Check stop lamp circuit. • Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
6.CHECK ICC BRAKE HOLD RELAY
Revision: December 20092009 QX56

CCS
DTC 45 BRAKE SW/STOP L SWCCS-29
< COMPONENT DIAGNOSIS >
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1. Turn ignition switch OFF.
2. Remove ICC brake hold relay.
3. Check continuity between ICC brake hold relay terminals.
Are continuity results as specified?
YES >> GO TO 7
NO >> Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION
TEST : ICC System Running Test".
7.CHECK ICC BRAKE HOLD RELAY CIRCUIT
1. Disconnect ICC unit and stop lamp switch connectors.
2. Check continuity between ICC unit harness connector (A) B17 terminal 38 and ICC brake hold relay harness connector (B)
E134 terminal 6.
3. Check continuity between ICC unit harness connector (A) B17 terminal 38 and stop lamp switch harness connector (C) E38 ter-
minal 4.
Are continuity test results as specified?
YES >> Replace ICC unit. Refer to CCS-70, "ICC Unit". Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Running Test" .
NO >> • Repair harness between ICC unit and ICC brake hold relay or stop lamp switch. • Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
7 - 6 Continuity should not exist.
4 - 3 Continuity should exist.
SKIA6651E
Continuity should exist.
Continuity should exist.
ALOIA0007ZZ
Revision: December 20092009 QX56