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![INFINITI QX56 2010 Factory Service Manual BCS
DIAGNOSIS SYSTEM (BCM)BCS-31
< FUNCTION DIAGNOSIS > [BCM]
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ACTIVE TEST
PANIC ALARM
PANIC ALARM : CONSULT-III Function (BCM - PANIC ALARM)INFOID:0000000005370265
ACTIVE INFINITI QX56 2010 Factory Service Manual BCS
DIAGNOSIS SYSTEM (BCM)BCS-31
< FUNCTION DIAGNOSIS > [BCM]
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ACTIVE TEST
PANIC ALARM
PANIC ALARM : CONSULT-III Function (BCM - PANIC ALARM)INFOID:0000000005370265
ACTIVE](/manual-img/42/57032/w960_57032-416.png)
BCS
DIAGNOSIS SYSTEM (BCM)BCS-31
< FUNCTION DIAGNOSIS > [BCM]
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PANIC ALARM
PANIC ALARM : CONSULT-III Function (BCM - PANIC ALARM)INFOID:0000000005370265
ACTIVE TEST
DOOR SW-DR [ON/OFF] Indicates switch status input from front door switch LH
DOOR SW-AS [ON/OFF] Indicates switch status input from front door switch RH
DOOR SW-RR [ON/OFF] Indicates switch st
atus input from rear door switch RH
DOOR SW-RL [ON/OFF] Indicates switch status input from rear door switch LH
BACK DOOR SW [ON/OFF] Indicates switch status input from back door switch
KEY CYL LK-SW [ON/OFF] Indicates lock switch status from door key cylinder switch
KEY CYL UN-SW [ON/OFF] Indicates unlock switch status from door key cylinder switch
CDL LOCK SW [ON/OFF] Indicates lock switch status from door lock and unlock switch
CDL UNLOCK SW [ON/OFF] Indicates unlock switch status from door lock and unlock switch Monitor Item
[Unit] Description
Test Item
Description
THEFT IND This test is able to check security indicator lamp operation. The lamp will be turned on when “ON”
on CONSULT-III screen is touched.
VEHICLE SECURITY HORN This test is able to check vehicle security horn operation. The horns will be activated for 0.5 sec-
onds after “ON” on CONSULT-III screen is touched.
HEADLAMP(HI) This test is able to check vehicle security lamp operation. The headlamps will be activated for 0.5
seconds after “ON” on CONSULT-III screen is touched.
Test Item
Description
HEAD LAMP (HI) This test is able to check head lamp (HI) operation.
PANIC ALARM This test is able to check panic alarm operation.
Revision: April 20092010 QX56
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![INFINITI QX56 2010 Factory Service Manual BCS-32
< COMPONENT DIAGNOSIS >[BCM]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000005146415
Refer to
LAN-44, "CAN Communication Signal Chart".
DTC LogicIN INFINITI QX56 2010 Factory Service Manual BCS-32
< COMPONENT DIAGNOSIS >[BCM]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000005146415
Refer to
LAN-44, "CAN Communication Signal Chart".
DTC LogicIN](/manual-img/42/57032/w960_57032-417.png)
BCS-32
< COMPONENT DIAGNOSIS >[BCM]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000005146415
Refer to
LAN-44, "CAN Communication Signal Chart".
DTC LogicINFOID:0000000005146416
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000005146417
1. PERFORM SELF DIAGNOSTIC
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Check “Self Diagnostic Result” of BCM.
Is
“CAN COMM CIRCUIT” displayed?
YES >> Refer to LAN-14, "Trouble Diagnosis Flow Chart".
NO >> Refer to GI-38, "
Intermittent Incident".
DTCCONSULT-III display
description DTC Detection Condition
Possible cause
U1000 CAN COMM CIRCUIT When BCM cannot communicate CAN com-
munication signal continuously for 2 sec-
onds or more. Any item (or items) of the following listed below is
malfunctioning in CAN communication system.
•Transmission
• Receiving (ECM)
• Receiving (METER/M&A)
• Receiving (TCM)
• Receiving (MULTI AV)
• Receiving (IPDM E/R)
• Receiving (I-KEY)
Revision: April 20092010 QX56
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![INFINITI QX56 2010 Factory Service Manual BCS
POWER SUPPLY AND GROUND CIRCUITBCS-33
< COMPONENT DIAGNOSIS > [BCM]
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POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000005146421
Regarding Wiring Diagra INFINITI QX56 2010 Factory Service Manual BCS
POWER SUPPLY AND GROUND CIRCUITBCS-33
< COMPONENT DIAGNOSIS > [BCM]
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POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000005146421
Regarding Wiring Diagra](/manual-img/42/57032/w960_57032-418.png)
BCS
POWER SUPPLY AND GROUND CIRCUITBCS-33
< COMPONENT DIAGNOSIS > [BCM]
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POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000005146421
Regarding Wiring Diagram information, refer to
BCS-49, "Wiring Diagram".
1. CHECK FUSES AND FUSIBLE LINK
Check that the following fuses and fusible link are not blown.
Is the fuse blown?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit.
NO >> GO TO 2
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM harness connector and ground.
Is the measurement value normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
Terminal No. Signal nameFuses and fusible link No.
57 Battery power supply 22 (15A)
70 F (50A)
11 Ignition ACC or ON 4 (10A)
38 Ignition ON or START 59 (10A)
ConnectorTe r m i n a l s
Power
source Condition Voltage (V) (Ap-
prox.)
(+) (-)
M18 11 Ground
ACC
power
supply Ignition
switch
ACC or
ON Battery voltage
38 Ground Ignition
power
supply Ignition
switch ON or START Battery voltage
M20 57 Ground
Battery
power
supply Ignition
switch OFF Battery voltage
70 Ground Battery
power
supply Ignition
switch
OFF Battery voltage
LIIA2415E
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BCS-34
< COMPONENT DIAGNOSIS >[BCM]
POWER SUPPLY AND GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Inspection End.
NO >> Repair or replace harness.
BCM
GroundContinuity
Connector Terminal
M20 67 Yes
LIIA0915E
Revision: April 20092010 QX56
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![INFINITI QX56 2010 Factory Service Manual BCS
COMBINATION SWITCH INPUT CIRCUITBCS-35
< COMPONENT DIAGNOSIS > [BCM]
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INPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000005146422
Regarding Wiring Dia INFINITI QX56 2010 Factory Service Manual BCS
COMBINATION SWITCH INPUT CIRCUITBCS-35
< COMPONENT DIAGNOSIS > [BCM]
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COMBINATION SWITCH
INPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000005146422
Regarding Wiring Dia](/manual-img/42/57032/w960_57032-420.png)
BCS
COMBINATION SWITCH INPUT CIRCUITBCS-35
< COMPONENT DIAGNOSIS > [BCM]
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COMBINATION SWITCH
INPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000005146422
Regarding Wiring Diagram information, refer to BCS-49, "Wiring Diagram".
1. CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM and combination switch.
3. Check continuity between BCM harness connector and combi- nation switch harness connector.
Does continuity exist?
YES >> GO TO 2
NO >> Repair or replace harness.
2. CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT
Check for continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Repair or replace harness.
NO >> GO TO 3
3. CHECK BCM OUTPUT VOLTAGE
1. Connect BCM.
2. Turn ignition switch ON.
3. Check voltage between BCM harness connector and ground.
System BCM
Combination switch
Continuity
Connector Terminal Connector Terminal
INPUT 1
M18(A) 6
M28(B) 6
Ye s
INPUT 2
57
INPUT 3 410
INPUT 4 39
INPUT 5 28
ALMIA0275ZZ
SystemBCM
GroundContinuity
Connector Terminal
INPUT 1
M186
No
INPUT 2
5
INPUT 3 4
INPUT 4 3
INPUT 5 2
ALMIA0276ZZ
ALMIA0277ZZ
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BCS-36
< COMPONENT DIAGNOSIS >[BCM]
COMBINATION SWITCH INPUT CIRCUIT
Is the measurement value normal?
YES >> GO TO 4
NO >> Replace BCM. Refer to
BCS-59, "
Removal and Installation".
4. CHECK COMBINATION SWITCH
Check combination switch. Refer to BCS-38, "
Description".
Is the check result normal?
YES >> Replace BCM. Refer to BCS-59, "Removal and Installation".
NO >> Replace the combination switch (applicable parts). Refer to EXL-154, "
Removal and Installation".
Special Repair RequirementINFOID:0000000005146423
1. ADDITIONAL SERVICE WHEN REPLACING BCM
>> Refer to BCS-3, "
ADDITIONAL SERVICE WHEN REPLAC ING CONTROL UNIT : Special Repair
Requirement".
SystemTe r m i n a l s
Vo l ta g e
(Approx.)
(+)
(− )
BCM
Ground
Connector Terminal
INPUT 1
M186
Refer to BCS-
40, "Refer-
ence Value".
INPUT 2
5
INPUT 3 4
INPUT 4 3
INPUT 5 2
Revision: April 20092010 QX56
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![INFINITI QX56 2010 Factory Service Manual BCS
COMBINATION SWITCH OUTPUT CIRCUITBCS-37
< COMPONENT DIAGNOSIS > [BCM]
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COMBINATION SWITCH
OUTPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000005146424
Regarding Wiring D INFINITI QX56 2010 Factory Service Manual BCS
COMBINATION SWITCH OUTPUT CIRCUITBCS-37
< COMPONENT DIAGNOSIS > [BCM]
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COMBINATION SWITCH
OUTPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000005146424
Regarding Wiring D](/manual-img/42/57032/w960_57032-422.png)
BCS
COMBINATION SWITCH OUTPUT CIRCUITBCS-37
< COMPONENT DIAGNOSIS > [BCM]
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COMBINATION SWITCH
OUTPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000005146424
Regarding Wiring Diagram information, refer to BCS-49, "Wiring Diagram".
1. CHECK OUTPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM and combination switch.
3. Check continuity between BCM harness connector and combi- nation switch harness connector.
Does continuity exist?
YES >> GO TO 2
NO >> Repair or replace harness.
2. CHECK OUTPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT
Check for continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Repair or replace harness.
NO >> GO TO 3
3. CHECK COMBINATION SWITCH
Check combination switch. Refer to BCS-38, "
Description".
Is the check result normal?
YES >> Replace BCM. Refer to BCS-59, "Removal and Installation".
NO >> Replace combination switch (applicable parts). Refer to EXL-154, "
Removal and Installation".
Special Repair RequirementINFOID:0000000005146425
1. ADDITIONAL SERVICE WHEN REPLACING BCM
>> Refer to BCS-3, "
ADDITIONAL SERVICE WHEN REPLAC ING CONTROL UNIT : Special Repair
Requirement".
SystemBCM
Combination switch
Continuity
Connector Terminal Connector Terminal
OUTPUT 1
M18(A) 36
M28(B) 1
Ye s
OUTPUT 2
352
OUTPUT 3 343
OUTPUT 4 334
OUTPUT 5 325
ALMIA0278ZZ
SystemBCM
GroundContinuity
Connector Terminal
OUTPUT 1
M1836
No
OUTPUT 2
35
OUTPUT 3 34
OUTPUT 4 33
OUTPUT 5 32
ALMIA0279ZZ
Revision: April 20092010 QX56
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![INFINITI QX56 2010 Factory Service Manual BCS-38
< COMPONENT DIAGNOSIS >[BCM]
COMBINATION SWITCH
COMBINATION SWITCH
DescriptionINFOID:0000000005146426
COMBINATION SWITCH MATRIX
Combination switch consists of INPUT circuit and OUTPUT circuit.
INFINITI QX56 2010 Factory Service Manual BCS-38
< COMPONENT DIAGNOSIS >[BCM]
COMBINATION SWITCH
COMBINATION SWITCH
DescriptionINFOID:0000000005146426
COMBINATION SWITCH MATRIX
Combination switch consists of INPUT circuit and OUTPUT circuit.](/manual-img/42/57032/w960_57032-423.png)
BCS-38
< COMPONENT DIAGNOSIS >[BCM]
COMBINATION SWITCH
COMBINATION SWITCH
DescriptionINFOID:0000000005146426
COMBINATION SWITCH MATRIX
Combination switch consists of INPUT circuit and OUTPUT circuit.
Combination switch circuit
Combination switch INPUT-OUTPUT system list
NOTE:
Headlamp has a dual system switch.
Diagnosis ProcedureINFOID:0000000005146427
1. CHECK LIGHT & TURN SIGNAL SWITCH
Check operation with normal light and turn signal switch installed.
Does it operate normally?
YES >> Replace light and turn signal switch. Refer to EXL-154, "Removal and Installation".
NO >> GO TO 2
2. CHECK WIPER & WASHER SWITCH
Check operation with normal wiper and washer switch installed.
Does it operate normally?
YES >> Replace wiper and washer switch. Refer to WW-85, "Wiper and Washer Switch".
SystemOUTPUT 1 OUTPUT 2 OUTPUT 3 OUTPUT 4 OUTPUT 5
INPUT 1 —FR WASHER FR WIPER LOW TURN LH TURN RH
INPUT 2 FR WIPER HI —FR WIPER INT PASSING HEADLAMP 1
INPUT 3 INT VOLUME 1 RR WASHER —HEADLAMP 2 HI BEAM
INPUT 4 RR WIPER INT INT VOLUME 3 AUTO LIGHT —TAIL LAMP
INPUT 5 INT VOLUME 2 RR WIPER —FR FOG —
LIIA0760E
Revision: April 20092010 QX56