2007 INFINITI QX56 Factory Service Manual

radio antenna steering wheel adjustment suspension air suspension airbag off snow chains

Page 49 of 3061

INFINITI QX56 2007 Factory Service Manual ACS-36
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
NOTE: DTC 55 will display when no malfunction is detected.
DTC 11 CONTROL UNITINFOID:0000000003533795
1.DIAGNOSTIC CHECK

ACS-36
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
NOTE: DTC 55 will display when no malfunction is detected.
DTC 11 CONTROL UNITINFOID:0000000003533795
1.DIAGNOSTIC CHECK
Are any items other than “DTC 11 CONTROL UNIT” indicated on self-diagnosis display?
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
. 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 12 VDC CONTROL UNITINFOID:0000000003533796
1.DIAGNOSIS CHECK
With CONSULT-II
Perform self-diagnosis of ABS actuator and electric unit (control unit). 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 >> 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 actuator and electric unit (control unit) connectors, and connect them
securely again. Erase DTC, then perform self-diagnosis of ICC system again.
OK or NG
OK >> Poor connector connection. Check connector housing for disconnected, loose, bent and collapsed
terminals. If any malfunction is detected, repair as necessary. Erase DTC and perform ICC sys-
tem running test. Refer to ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC
system again.
NG >> GO TO 3.
3.CHECK HARNESS BETWEEN ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
104 LASER AIMING INCMP×× ×• Laser beam aiming of ICC sensor
is not adjustedACS-48,
"DTC 104
LASER
AIMING
INCMP"
107 LASER COMM FAIL×× ×• CAN data received by ICC sensor
is strange (from ICC unit, combi-
nation meter or ECM)ACS-48,
"DTC 107
LASER
COMM
FA IL"
109 LASER HIGH TEMP×× ×• Temperature around ICC sensor
is excessively highACS-48,
"DTC 109
LASER
HIGH
TEMP"
DTC
No.CONSULT-II screen termsICC sys-
tem
warning
lampFail-safe
Malfunctions detected where...Refer-
ence
page Vehicle-
to-vehi-
cle dis-
tance
control
modeConven-
tional
(fixed
speed)
cruise
control
modeBrake as-
sist (with
preview
function)

Page 50 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-37
< SERVICE INFORMATION >[ICC]
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1. Turn ignition switch OFF.
2. Disconnect ICC unit and ABS actuator and electric unit

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-37
< SERVICE INFORMATION >[ICC]
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1. Turn ignition switch OFF.
2. Disconnect ICC unit and ABS actuator 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.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55. Erase DTC and per-
form 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 ABS actuator and electric unit (control 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 20 CAN COMM CIRCUITINFOID:0000000003533797
1.CHECK CAN COMMUNICATION
With CONSULT-II
1. Perform self-diagnosis.
2. Print self-diagnostic result.
>> After printing self-diagnostic result, GO TO “CAN system”. Refer to LAN-4, "
CAN Communication
System" .
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER SUPPLY CIR2INFOID:0000000003533798
1.CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors and connect them securely again. Erase DTC, then perform self-diagno-
sis of ICC system again.
OK or NG
OK >> GO TO 2.
NG >> • 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 ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC
system again.
2.CHECK POWER SUPPLY CIRCUIT FOR ICC UNIT
1. Turn ignition switch ON.
2. Check voltage between ICC unit harness connector B17 termi-
nal 33, 42 and ground.
OK or NG
OK >> GO TO 3.
NG >> • Repair ICC unit power supply 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.
3.CHECK GROUND CIRCUIT FOR ICC UNITContinuity should exist.
WKIA3616E
Battery voltage should exist.
SKIA1173E

Page 51 of 3061

INFINITI QX56 2007 Factory Service Manual ACS-38
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors.
3. Check continuity between ICC unit harness connector B

ACS-38
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
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.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55 . 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 ICC unit ground 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.
DTC 41 VHCL SPEED SE CIRCINFOID:0000000003533799
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 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.CHECK A/T VEHICLE SPEED SENSOR
With CONSULT-II
With data monitor, check “VHCL SPD AT”.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55. 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 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 43 VDC/TCS/ABS CIRCINFOID:0000000003533800
1.DIAGNOSIS CHECK 1
With CONSULT-II
Perform self-diagnosis. 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 self-diagnosis of ABS actuator and electric unit (control unit). 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
. 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 45 BRAKE SW/STOP L SWINFOID:0000000003533801
1.CHECK CONNECTORS FOR ICC UNITContinuity should exist.
SKIA6650E

Page 52 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-39
< SERVICE INFORMATION >[ICC]
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1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors and connect them securel

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-39
< SERVICE INFORMATION >[ICC]
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1. Turn ignition switch OFF.
2. Disconnect ICC unit connectors and connect them securely again. Erase DTC, then perform self-diagno-
sis of ICC system again.
OK or NG
OK >> • 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 ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC
system again.
NG >> GO TO 2.
2.CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
With CONSULT-II
With data monitor, check if “STOP LAMP SW” and “BRAKE SW” are operating normally.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55. 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 >> • 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. Refer to BR-5
.
OK or NG
OK >> GO TO 4.
NG >> After adjustment, erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System
Running Test" . Then perform self-diagnosis of ICC system again.
4.CHECK ICC BRAKE SWITCH
Check ICC brake switch. Refer toACS-54, "
ICC Brake Switch and Stop Lamp Switch" .
OK or NG
OK >> Replace ICC unit. Refer to ACS-55. 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 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 STOP LAMP ILLUMINATION
Check stop lamp illumination.
OK or NG
OK >> GO TO 6.
NG >> • Check stop lamp circuit. Refer to LT- 7 7
.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
6.CHECK ICC BRAKE HOLD RELAY
1. Turn ignition switch OFF.
2. Remove ICC brake hold relay.
3. Check continuity between ICC brake hold relay terminals.
OK or NG
OK >> GO TO 7.
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.
7 - 6 Continuity should not exist.
4 - 3 Continuity should exist.
SKIA6651E

Page 53 of 3061

INFINITI QX56 2007 Factory Service Manual ACS-40
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
7.CHECK ICC BRAKE HOLD RELAY CIRCUIT
1. Disconnect ICC unit and stop lamp switch connectors.
2. Check continuity between

ACS-40
< SERVICE INFORMATION >[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
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 ter-
minal 38 and ICC brake hold relay harness connector E134 ter-
minal 7.
3. Check continuity between ICC unit harness connector B17 ter-
minal 38 and stop lamp switch harness connector E38 terminal
4.
OK or NG
OK >> Replace ICC unit. Refer to ACS-55. 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 ICC brake hold relay or 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 46 OPERATION SW CIRCINFOID:0000000003533802
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.
OK or NG
OK >> • 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 ACS-9, "
ICC System Running Test". Then perform self-diagnosis of ICC
system again.
NG >> GO TO 2.
2.CHECK ICC STEERING SWITCH
Check ICC steering switch. Refer to ACS-54, "
ICC Steering Switch" .
OK or NG
OK >> GO TO 3.
NG >> Replace ICC steering switch assembly. Refer to ACS-54, "
ICC Steering 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.
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.
OK or NG
OK >> GO TO 4.Continuity should exist.
Continuity should exist.
WKIA3403E
67 - 33, 99 - 34 Continuity should exist.
WKIA1928E

Page 54 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-41
< SERVICE INFORMATION >[ICC]
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NG >> • Repair harness between ECM and spiral cable.
• Erase DTC and perform ICC sy

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
ACS-41
< SERVICE INFORMATION >[ICC]
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NG >> • Repair harness between ECM and spiral cable.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
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.
OK or NG
OK >> Replace ECM. Erase DTC and perform ICC system run-
ning test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of ICC system again.
NG >> • Replace spiral cable. Refer to SRS-37, "
Removal and
Installation".
• 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 74 LASER BEAM OFF CNTRINFOID:0000000003533803
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 74 LASER BEAM OFF CNTR indicated?
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 90 STOP LAMP RLY FIXINFOID:0000000003533804
1.CHECK ICC UNIT CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect and check ICC unit connector.
OK or NG
OK >> GO TO 2.
NG >> • Connector malfunction.
• Erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System Running Test".
Then perform self-diagnosis of system.
2.CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH
With CONSULT-II
1. Connect ICC unit connector and turn ignition switch ON.
2. With data monitor, check that “STOP LAMP SW” and “BRAKE SW” operate normally.
OK or NG
OK >> GO TO 11.
NG >> • 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. Refer to BR-5
.
OK or NG
OK >> GO TO 4.
NG >> After adjustment, erase DTC and perform ICC system running test. Refer to ACS-9, "
ICC System
Running Test". Then perform self-diagnosis of ICC system again. 34 - 14, 33 - 15 Continuity should exist.
WKIA4572E

Page 55 of 3061

INFINITI QX56 2007 Factory Service Manual 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

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

Page 56 of 3061

INFINITI QX56 2007 Factory Service Manual 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 Sw

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

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