2009 INFINITI QX56 200

BCS-30
< COMPONENT DIAGNOSIS >[BCM]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000003776407
Refer to
LAN-44, "CAN Communication Signal Chart".
DTC LogicINFOID:0000000003776408
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000003776409
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: December 20092009 QX56

BCS
U1010 CONTROL UNIT (CAN)BCS-31
< COMPONENT DIAGNOSIS > [BCM]
C
D
E
F
G H
I
J
K L
B A
O P
N
U1010 CONTROL UNIT (CAN)
DTC LogicINFOID:0000000003776410
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000003776411
1. REPLACE BCM
When “DTC:U1010” is detected, replace BCM.
>> Replace BCM. Refer to BCS-56, "Removal and Installation"
.
Special Repair RequirementINFOID:0000000003776412
1. ADDITIONAL SERVICE WHEN REPLACING BCM
>> Refer to BCS-3, "ADDITIONAL SERVICE WHEN RE PLACING CONTROL UNIT : Special Repair
Requirement".
DTCCONSULT-III display de-
scription DTC Detection Condit
ion Possible cause
U1010 CONTROL UNIT (CAN) When detecting error during the initial diagnosis of CAN control-
ler of BCM.
BCM
Revision: December 20092009 QX56

BCS-32
< COMPONENT DIAGNOSIS >[BCM]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000003776413
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
Check continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Inspection End.
NO >> Repair or replace harness.
Terminal No. Signal name Fuses 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)
Connector Te 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
BCM
GroundContinuity
Connector Terminal
M20 67 Yes
LIIA0915E
Revision: December 20092009 QX56

BCS
COMBINATION SWITCH INPUT CIRCUITBCS-33
< COMPONENT DIAGNOSIS > [BCM]
C
D
E
F
G H
I
J
K L
B A
O P
N
COMBINATION SWITCH
INPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000003776414
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.
Is the measurement value normal?
System BCM Combination switch
Continuity
Connector Terminal Connector Terminal
INPUT 1
M18(A) 6
M28(B) 6
Ye s
INPUT 2 5 7
INPUT 3 4 10
INPUT 4 3 9
INPUT 5 2 8
ALMIA0275ZZ
System
BCM
GroundContinuity
Connector Terminal
INPUT 1
M186
No
INPUT 2 5
INPUT 3 4
INPUT 4 3
INPUT 5 2
ALMIA0276ZZ
System Te r m i n a l s
Voltag e
(Approx.)
(+) (
−)
BCM
Ground
Connector Terminal
INPUT 1
M186
Refer to BCS-
38, "Refer-
ence Value".
INPUT 2 5
INPUT 3 4
INPUT 4 3
INPUT 5 2
ALMIA0277ZZ
Revision: December 20092009 QX56

BCS-34
< COMPONENT DIAGNOSIS >[BCM]
COMBINATION SWITCH INPUT CIRCUIT
YES >> GO TO 4
NO >> Replace BCM. Refer to
BCS-56, "Removal and Installation"
.
4. CHECK COMBINATION SWITCH
Check combination switch. Refer to BCS-36, "Description"
.
Is the check result normal?
YES >> Replace BCM. Refer to BCS-56, "Removal and Installation".
NO >> Replace the combination switch (applicable parts). Refer to EXL-152, "Removal and Installation"
.
Special Repair RequirementINFOID:0000000003776415
1. ADDITIONAL SERVICE WHEN REPLACING BCM
>> Refer to BCS-3, "ADDITIONAL SERVICE WHEN RE PLACING CONTROL UNIT : Special Repair
Requirement".
Revision: December 20092009 QX56

BCS
COMBINATION SWITCH OUTPUT CIRCUITBCS-35
< COMPONENT DIAGNOSIS > [BCM]
C
D
E
F
G H
I
J
K L
B A
O P
N
COMBINATION SWITCH OUTPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000003776416
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-36, "Description"
.
Is the check result normal?
YES >> Replace BCM. Refer to BCS-56, "Removal and Installation".
NO >> Replace combination switch (applicable parts). Refer to EXL-152, "Removal and Installation"
.
Special Repair RequirementINFOID:0000000003776417
1. ADDITIONAL SERVICE WHEN REPLACING BCM
>> Refer to BCS-3, "ADDITIONAL SERVICE WHEN RE PLACING 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 35 2
OUTPUT 3 34 3
OUTPUT 4 33 4
OUTPUT 5 32 5
ALMIA0278ZZ
System
BCM
GroundContinuity
Connector Terminal
OUTPUT 1
M1836
No
OUTPUT 2 35
OUTPUT 3 34
OUTPUT 4 33
OUTPUT 5 32
ALMIA0279ZZ
Revision: December 20092009 QX56

BCS-36
< COMPONENT DIAGNOSIS >[BCM]
COMBINATION SWITCH
COMBINATION SWITCH
DescriptionINFOID:0000000003776418
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:0000000003776419
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-152, "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-80, "Wiper and Washer Switch".
System OUTPUT 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: December 20092009 QX56

BCS
COMBINATION SWITCHBCS-37
< COMPONENT DIAGNOSIS > [BCM]
C
D
E
F
G H
I
J
K L
B A
O P
N
NO >> GO TO 3
3. CHECK SWITCH BASE
(SPIRAL CABLE)
Check operation with normal switch base (spiral cable) installed.
Does it operate normally?
YES >> Replace switch base (spiral cable). Refer to SR-7, "Removal and Installation".
NO >> Combination switch is normal.
Revision: December 20092009 QX56