2008 INFINITI QX56 Factory Service Manual

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Page 665 of 4083

INFINITI QX56 2008 Factory Service Manual CCS
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2
CCS-25
< COMPONENT DIAGNOSIS >
C
D E
F
G H
I
J
K L
M B
N P A
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2
DTC 31 POWER SUPPLY CIR1, DTC 34

Page 666 of 4083

INFINITI QX56 2008 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:0000000001744706
1.PERFORM ICC UNIT SELF-DIAGNOSIS
Perform self-diagnosis.
Is
“DT

Page 667 of 4083

INFINITI QX56 2008 Factory Service Manual CCS
DTC 43 VDC/TCS/ABS CIRCCCS-27
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B
N P A
DTC 43 VDC/TCS/ABS CIRC
DTC 43 VDC/TCS/ABS CIRCINFOID:0000000001744707
1.DIAGNOSIS CHECK 1
Perform self-diagnosis

Page 668 of 4083

INFINITI QX56 2008 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:0000000001744708
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:0000000001744708
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: March 2010 2008 QX56

Page 669 of 4083

INFINITI QX56 2008 Factory Service Manual CCS
DTC 45 BRAKE SW/STOP L SWCCS-29
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B
N P A
1. Turn ignition switch OFF.
2. Remove ICC brake hold relay.
3. Check continuity between ICC brake hold relay t

Page 670 of 4083

INFINITI QX56 2008 Factory Service Manual CCS-30
< COMPONENT DIAGNOSIS >
DTC 46 OPERATION SW CIRC
DTC 46 OPERATION SW CIRC
DTC 46 OPERATION SW CIRCINFOID:0000000001744709
1.CHECK ECM CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ECM co

CCS-30
< COMPONENT DIAGNOSIS >
DTC 46 OPERATION SW CIRC
DTC 46 OPERATION SW CIRC
DTC 46 OPERATION SW CIRCINFOID:0000000001744709
1.CHECK ECM CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ECM connector and connect it securely again. Erase DTC, then perform self-diagnosis of ICC
system again.
Does the DTC reset?
YES >> • 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".
NO >> GO TO 2
2.CHECK ICC STEERING SWITCH
Check ICC steering switch.
Does the ICC steeri ng switch check OK?
YES >> GO TO 3
NO >> Replace ICC steering switch assembly. Refer to CCS-72, "
Removal and Installation". Erase DTC
and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC System Running
Te s t".
3.CHECK ICC STEERING SWITCH SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM and spiral cable connectors.
3. Check continuity between ECM harness connectors E16 and F54 terminals 67, 99 and spiral cable harness connector M30
terminals 33, 34.
Does continuity exist?
YES >> GO TO 4
NO >> • Repair harness between ECM and spiral cable. • Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
4.CHECK ICC STEERING SWITCH SIGNAL CIRCUIT
1. Disconnect remaining spiral cable connector.
2. Check continuity between spiral cable (A) (to vehicle) terminals 33, 34 and spiral cable (B) (to switch) terminals 14,15.
Does continuity exist?
YES >> Replace ECM. Erase DTC and perform ICC system run- ning test. Refer to CCS-8, "
ACTION TEST : ICC System
Running Test".
NO >> • Replace spiral cable. Refer to SR-7, "
Removal and
Installation".
• Erase DTC and perform ICC system running test.
Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
67 - 33, 99 - 34
Continuity should exist.
WKIA1928E
34 - 14, 33 - 15Continuity should exist.
WKIA4572E
Revision: March 2010 2008 QX56

Page 671 of 4083

INFINITI QX56 2008 Factory Service Manual CCS
DTC 74 LASER BEAM OFF CNTRCCS-31
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M B
N P A
DTC 74 LASER BEAM OFF CNTR
DTC 74 LASER BEAM OFF CNTRINFOID:0000000001744710
1.DIAGNOSTIC CHECK
1. Adjust lase

Page 672 of 4083

INFINITI QX56 2008 Factory Service Manual CCS-32
< COMPONENT DIAGNOSIS >
DTC 90 STOP LAMP RLY FIX
DTC 90 STOP LAMP RLY FIX
DTC 90 STOP LAMP RLY FIXINFOID:0000000001744711
1.CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect

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