2008 INFINITI QX56 ignition

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

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 B17 (A) terminal 38 and ICC brake hold relay harness connector E134
(B) terminal 6.
3. Check continuity between ICC unit harness connector B17 (A) terminal 38 and stop lamp switch harness connector E38 (C) 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: March 2010
2008 QX56

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

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 and check ICC unit connector.
Does connector check OK?
YES >> GO TO 2
NO >> • Connector malfunction. • Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
2.CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
1. Connect ICC unit connector and turn ignition switch ON.
2. With data monitor, check that “STOP LAMP SW” and “BRAKE SW” operate normally.
Do the monitor items display normally?
YES >> GO TO 11
NO >> • BRAKE SW: GO TO 3 • STOP LAMP SW: GO TO 8
3.CHECK AND ADJUST ICC BRAKE SWITCH
Check ICC brake switch for proper installation and adjust if necessary.
Does the ICC brake switch pass inspection?
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. Refer to CCS-28, "
DTC 45 BRAKE SW/STOP L SW" .
Is the ICC brake switch operating normally?
YES >> GO TO 5
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 ICC BRAKE HOLD RELAY
Disconnect ICC brake hold relay and check continuity between ICC
brake hold relay terminal 4 and terminal 3.
Does continuity exist?
YES >> GO TO 6
NO >> Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION
TEST : ICC System Running Test".
6.CHECK HARNESS THROUGH ICC BRAKE HOLD RELAY, ICC BRAKE SWITCH, ICC UNIT
1. Disconnect ECM and ICC unit harness connectors. Continuity should exist.
SKIA6658E
Revision: March 2010
2008 QX56

CCS
DTC 90 STOP LAMP RLY FIXCCS-33
< COMPONENT DIAGNOSIS >
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2. Check continuity between ICC brake hold relay harness connec- tor E134 (B) terminal 3 and IC C unit harness connector B17 (A)
terminal 29.
3. Check continuity between ICC unit harness connector B17 (A) terminal 29 and ground.
Are continuity test results as specified?
YES >> GO TO 7
NO >> • 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 CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
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 4 and ground.
Does battery voltage 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 >> • Check fuse or ICC brake hold relay power supply sys- tem harness.
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
8.CHECK STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Check stop lamp switch.
Does stop lamp switch operate normally?
YES >> GO TO 9
NO >> Replace stop lamp switch. Erase DTC and perform ICC system running test. Refer to CCS-8,
"ACTION TEST : ICC System Running Test".
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.
Does the ICC brake hold relay 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 >> GO TO 10
10.CHECK ICC BRAKE HOLD RELAY Continuity should exist.
Continuity should not exist.
ALOIA0008ZZ
Battery voltage should exist
ALOIA0009ZZ
Revision: March 2010
2008 QX56

CCS
DTC 90 STOP LAMP RLY FIXCCS-35
< COMPONENT DIAGNOSIS >
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1. Connect connectors of ICC unit and stop lamp switch.
2. While performing active test (STOP LAMP: STP LMP DRIVE ON) with CONSULT-III, check voltage between ICC unit harness
connector B17 terminal 47 and ground.
Does battery voltage exist?
YES >> GO TO 14
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".
14.CHECK ICC BRAKE HOLD RELAY POWER SUPPLY CIRCUIT
Check voltage between ICC brake hold relay harness connector
E134 terminal 7 and ground.
Does battery voltage exist?
YES >> GO TO 15
NO >> • Check fuse or ICC brake hold relay power supply har- ness.
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC System Run-
ning Test".
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 (B) terminal 6 and IC C unit harness connector B17 (A)
terminal 38.
4. Check continuity between ICC unit harness connector B17 (A) terminal 38 and ground.
Are continuity test results as specified?
YES >> GO TO 16
NO >> • Repair harness between ICC brake hold relay and ICC unit or between ICC brake hold relay and stop lamp switch.
• Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
16.CHECK ICC BRAKE HOLD RELAY
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-III, and make sure that stop lamps are illuminated.
Do the stop lamps illuminate?
YES >> GO TO 17
NO >> Replace ICC brake hold relay. Erase DTC and perform ICC system running test. Refer to CCS-8,
"ACTION TEST : ICC System Running Test".
17.CHECK ICC UNIT STANDARD VOLTAGE
47 - Ground
Battery voltage should exist
(during active test)
SKIA3075E
7 - Ground Battery voltage should exist
ALOIA0010ZZ
6 - 38 Continuity should exist.
38 - Ground Continuity should not exist.
ALOIA0011ZZ
Revision: March 2010 2008 QX56

CCS-38
< COMPONENT DIAGNOSIS >
DTC 96 NP RANGE
DTC 96 NP RANGE
DTC 96 NP RANGEINFOID:0000000001744713
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.
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 necessary. Erase DTC and perform ICC system
running test. Refer to CCS-8, "
ACTION TEST : ICC System Running Test".
2.CHECK NP RANGE SWITCH SIGNAL
With data monitor, check that “NP RANGE SW” operates normally.
Does the "NP RANGE SW" monitor item operate normally?
YES >> Perform TCM diagnosis. Refer to TM-30, "Introduction".
NO >> 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 I CC unit harness connector B13 ter-
minal 7 and A/T assembly harness connector F9 terminal 9.
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 TCM. • Erase DTC and perform ICC system running test. Refer to CCS-8, "
ACTION TEST : ICC Sys-
tem Running Test".
7 - 9 Continuity should exist.
SKIA5982E
Revision: March 2010
2008 QX56

CCS-46
< ECU DIAGNOSIS >
ICC UNIT
ECU DIAGNOSIS
ICC UNIT
Terminal and Reference Value for ICC UnitINFOID:0000000001756742
Te r m i n a lWire col-
or Item Condition
Voltage (V)
(Approx.)
Ignition
switch Operation
1W/L Battery power supply OFF— Battery voltage
2W/L
5 P CAN-L —— —
7 B/R N-P RANGE ON A/T selector lever in "P" or "N"Battery voltage
10 V/R Brake booster signal ON—
14 L CAN-H —— —
19 B Ground
ON——
20 B
29 BR/W ICC brake switch
(normally closed) Selector le-
ver: Not in “N” or “P” position Depress the brake
pedal
0
Release the brake
pedal Battery voltage
30 L TX —— —
33 R/B Ignition switch power supply ON —
Battery voltage
38 R/G St op la mp sw i tc h
(normally open) OFFDepress the brake pedal
Release the brake pedal
0
39 V/W RX —— —
40 G Parking brake signal
ONParking brake is ON
0
Parking brake is OFF Battery voltage
42 R/B Ignition switch power supply —Battery voltage
46 B Ground ——
47 BR Stop lamp drive output signal Brake operating with ICC system
Battery voltage
Brake not operating with ICC sys-
tem 0
SKIA1243E
Revision: March 2010
2008 QX56