2009 INFINITI QX56 Factory Service Manual

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Page 673 of 4171

INFINITI QX56 2009 Factory Service Manual 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 a

Page 674 of 4171

INFINITI QX56 2009 Factory Service Manual 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 o

Page 675 of 4171

INFINITI QX56 2009 Factory Service Manual 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 syste

Page 676 of 4171

INFINITI QX56 2009 Factory Service Manual 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

Page 677 of 4171

INFINITI QX56 2009 Factory Service Manual 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
“DT

Page 678 of 4171

INFINITI QX56 2009 Factory Service Manual 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

Page 679 of 4171

INFINITI QX56 2009 Factory Service Manual 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. Disc

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

Page 680 of 4171

INFINITI QX56 2009 Factory Service Manual 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 t

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