ignition INFINITI QX56 2011 Factory Service Manual

BCS
BCM
BCS-51
< ECU DIAGNOSIS INFORMATION >
C
D E
F
G H
I
J
K L
B A
O P
N
84
(BR) Ground
Room antenna 1 (+)
(Instrument center) Output
Ignition switch
OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
85
(Y) Ground Room antenna 1 (-)
(Instrument center)
OutputIgnition switch
OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
86
(W) Ground Room antenna 2 (+)
(Console) OutputIgnition switch
OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
Terminal No.
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+ −
JMKIA3838GB
JMKIA3839GB
JMKIA3838GB
JMKIA3839GB
JMKIA3838GB
JMKIA3839GB
Revision: 2010 May2011 QX56

BCS-52
< ECU DIAGNOSIS INFORMATION >
BCM
87
(B) Ground
Room antenna 2 (
−)
(Console) Output
Ignition switch
OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
88
(V) Ground Luggage room an-
tenna (+)
OutputIgnition switch
OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
89
(G) Ground Luggage room an-
tenna (-) OutputIgnition switch
OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
Te r m i n a l N o .
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+ −
JMKIA3838GB
JMKIA3839GB
JMKIA3838GB
JMKIA3839GB
JMKIA3838GB
JMKIA3839GB
Revision: 2010 May2011 QX56

BCS
BCM
BCS-53
< ECU DIAGNOSIS INFORMATION >
C
D E
F
G H
I
J
K L
B A
O P
N
90
(Y) Ground Push-button ignition
switch illumination OutputPush-button ig-
nition switch illu-
mination ON 12 V
OFF 0 V
91
(O) Ground LOCK indicator lamp Output LOCK indicator
lampOFF (Ignition switch OFF) Battery voltage
ON 0 V
92
(L) Ground Push-button ignition
switch illumination
ground Output Tail lamp OFF 0 V
ON
NOTE:
When the illumination brighten-
ing/dimming level is in the neutral position
6.0 - 7.0 V
93
(GR/R) GroundIntelligent Key warn-
ing buzzer
OutputIntelligent Key
warning buzzer Sounding 0 V
Not sounding 12 V
94
(Y/G) Ground Steering lock unit
communication Input/
Output Steering lock LOCK status 12 V
LOCK or UNLOCK
For 15 seconds after UN-
LOCK
12 V
15 seconds or later after
UNLOCK 0 V
95
(W) Ground
Steering lock unit
power supply Output Ignition switch OFF or ACC 12 V
ON 0 V
96
(BR) Ground ACC relay control Output Ignition switch OFF 0 V
ACC or ON 12 V
97
(R/W) Ground Starter relay control Output Ignition switch
ONWhen selector lever is in
P or N position
12 V
When selector lever is not
in P or N position 0 V
98
(O) Ground Ignition relay (IPDM
E/R) control
Output Ignition switch OFF or ACC 12 V
ON 0 V
99
(R) Ground Ignition relay-1 con-
trol
Output Ignition switch OFF or ACC 0 V
ON 12 V
100
(SB) Ground
Push-button ignition
switch (push switch) InputPush-button ig-
nition switch
(push switch) Pressed 0 V
Not pressed 12 V
101
(W/B) Ground Ignition power sup-
ply No. 2 Output Ignition switch OFF or ACC 0 V
ON 12 V
Terminal No.
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+ −
JPMIA1554GB
JMKIA0066GB
Revision: 2010 May2011 QX56

BCS-54
< ECU DIAGNOSIS INFORMATION >
BCM
*: For Canada
Fail-safeINFOID:0000000006274820
FAIL-SAFE CONTROL BY DTC
BCM performs fail-safe control when any DTC are detected.
102
(BR) Ground P/N position Input Selector lever P or N position 12 V
Except P and N positions 0 V
104
(R/B) Ground A/T shift selector
(detention switch)
power supply Output Ignition switch ON 12 V
105
(O/L) Ground Stop lamp switch 2 Input Ignition switch OFF Battery voltage
106
(Y/G) Ground
Blower fan motor re-
lay control Output Ignition switch OFF or ACC 0 V
ON 12 V
107 (L) Ground
Steering lock condi-
tion No. 1 Input Steering lock LOCK status 0 V
UNLOCK status 12 V
108 (P) Ground
Steering lock condi-
tion No. 2 Input Steering lock LOCK status 12 V
UNLOCK status 0 V
109
(L/W) Ground ACC indicator lamp Output Ignition switch OFF (LOCK indicator is
not illuminated)
Battery voltage
ACC 0 V
Te r m i n a l N o .
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+ −
Display contents of CONSULT Fail-safe Cancellation
B2013: ID DISCORD BCM-S/ L Inhibit engine cranking When communication between BCM and steering lock unit are commu-
nicated normally.
B2014: CHAIN OF S/L-BCM Inhibit engine cranking When communication between BCM and steering lock unit are commu-
nicated normally.
B2192: ID DISCORD BCM-ECM Inhibit engine cranking Erase DTC
B2193: CHAIN OF BCM-ECM Inhibit engine cranking Erase DTC
B2195: ANTI-SCANNING Inhibit engine cranking Ignition switch ON → OFF
B2198: NATS ANTENNA AMP Inhibit engine cranking Erase DTC
B2557: VEHICLE SPEED In hibit steering lockWhen the following CAN signal status (vehicle speed signal) becomes
consistent
 Vehicle speed signal (ABS)
 Vehicle speed signal (Meter)
B2601: SHIFT POSITION Inhibit steering lock 500 ms after the following signal reception status becomes consistent
 Selector lever P position switch signal
 P range signal (CAN)
B2602: SHIFT POSITION Inhibit steering lock 5 seconds after the following BCM recognition conditions are fulfilled
 Ignition switch is in the ON position
 Selector lever P position switch signal: Except P position (battery volt-
age)
 Vehicle speed: 4 km/h (2.5 MPH) or more
Revision: 2010 May2011 QX56

BCS
BCM
BCS-55
< ECU DIAGNOSIS INFORMATION >
C
D E
F
G H
I
J
K L
B A
O P
N
B2603: SHIFT POSI STATUS Inhibit steering lock
500 ms after any of the following BCM recognition conditions are fulfilled
Status 1
- Ignition switch is in the ON position
- Selector lever P position switch signal: Except P position (12 V)
- Selector lever P/N position signal: Except P and N positions (0 V)
Status 2
- Ignition switch is in the ON position
- Selector lever P position switch signal: P position (0 V)
- Selector lever P/N position signal: P or N positions (12 V)
B2604: PNP/CLUTCH SW Inhibit steering lock 500 ms after any of the following BCM recognition conditions are fulfilled
Status 1
- Ignition switch is in the ON position
- Selector lever P/N position signal: P or N position (12 V)
- Shift position signal (CAN): P or N position
Status 2
- Ignition switch is in the ON position
- Selector lever P/N position signal: Except P and N positions (0 V)
- Shift position signal (CAN): Except P and N position
B2605: PNP/CLUTCH SW Inhibit steering lock 500 ms after any of the following BCM recognition conditions are fulfilled
Status 1
- Power position: IGN
- Selector lever P/N position signal: Except P and N positions (0 V)
- Interlock/PNP switch signal (CAN): OFF
Status 2
- Ignition switch is in the ON position
- Selector lever P/N position signal: P or N position (12 V)
- Interlock/PNP switch signal (CAN): ON
B2608: STARTER RELAY Inhibit engine cranking 500 ms after the following signal communication status becomes con-
sistent
 Starter motor re
lay control signal
 Starter relay status signal (CAN)
B2609: S/L STATUS  Inhibit engine crank-
ing
 Inhibit steering lock When the following steering lock conditions agree
 BCM steering lock control status
 Steering lock condition No. 1 signal status
 Steering lock condition No. 2 signal status
B260B: STEERING LOCK UNIT Inhibit steering lock Erase DTC
B260D: STEERING LOCK UNIT Inhibit steering lock Erase DTC
B260F: ENG STATE SIG LOST Inhibit engine cranking When any of the following conditions are fulfilled
 Power position changes to ACC
 Receives engine status signal (CAN)
B2612: S/L STATUS  Inhibit engine crank-
ing
 Inhibit steering lock When any of the following conditions are fulfilled
 Steering lock unit status signal (CAN) is received normally
 The BCM steering lock control status matches the steering lock status
recognized by the steering lock unit status signal (CAN from IPDM E/
R)
B2619: BCM Inhibit engine cranking 1 second after the steering lock unit power supply output control inside
BCM becomes normal
B26EF: STRG LCK RELAY OFF Inhibit engine cranking When the following conditions are fulfilled
 Steering lock relay signal (CAN): ON
 Steering lock unit status signal (CAN): ON
B26F0: STRG LCK RELAY ON Inhibit engine cranking When the following conditions are fulfilled
 Steering lock relay signal (CAN): OFF
 Steering lock unit status signal (CAN): OFF
B26F1: IGN RELAY OFF Inhibit engine cranking When the following conditions are fulfilled
 Ignition switch ON signal (CAN: Transmitted from BCM): ON
 Ignition switch ON signal (CAN: Transmitted from IPDM E/R): ON
B26F2: IGN RELAY ON Inhibit engine cranking When the following conditions are fulfilled
 Ignition switch ON signal (CAN: Transmitted from BCM): OFF
 Ignition switch ON signal (CAN: Transmitted from IPDM E/R): OFF
Display contents of CONSULT Fail-safe Cancellation
Revision: 2010 May2011 QX56

BCS-70
< DTC/CIRCUIT DIAGNOSIS >
U1000 CAN COMM
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM
DescriptionINFOID:0000000006274829
CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, and each control unit shares information and links with
other control units during operation (not independent). In CAN communication, control units are connected
with 2 communication lines (CAN H-line, CAN L-line) al lowing a high rate of information transmission with less
wiring. Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to LAN-28, "
CAN COMMUNICATION SYSTEM : CAN Communica-
tion Signal Chart".
DTC LogicINFOID:0000000006274830
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000006274831
1.PERFORM SELF DIAGNOSTIC
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Check “Self Diagnostic Result” of BCM.
Is DTC
“U1000” displayed?
YES >> Refer to LAN-18, "Trouble Diagnosis Flow Chart".
NO >> Refer to GI-40, "
Intermittent Incident".
DTCCONSULT-III display
description DTC Detection Condition Possible cause
U1000 CAN COMM When BCM cannot communicate CAN com-
munication signal continuously for 2 seconds
or more.
CAN communication system
Revision: 2010 May2011 QX56

BCS-72
< DTC/CIRCUIT DIAGNOSIS >
U0415 VEHICLE SPEED
U0415 VEHICLE SPEED
DescriptionINFOID:0000000006274834
U0415 is displayed if any unusual condition is present in the reception status of the vehicle speed signal from
the ABS actuator and electric unit (control unit).
DTC LogicINFOID:0000000006274835
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION
1. Erase the DTC.
2. Turn ignition switch OFF.
3. Perform the “Self Diagnostic Result” of BCM with CONS ULT-III, when passed 2 seconds or more after the
ignition switch is turned ON.
Is any DTC detected?
YES >> Refer to BCS-72, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006274836
1.ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAG RESULTS
Perform “Self-Diagnostic Result” of ABS actuator and electric unit (control unit) with CONSULT-III. Refer to
BRC-40, "
CONSULT-III Function".
Is any DTC detected?
YES >> Repair or replace the malfunctioning part.
NO >> Replace BCM. Refer to BCS-81, "
Removal and Installation".
DTC CONSULT-III display
description DTC Detection Condition Probable cause
U0415 VEHICLE SPEED When the vehicle speed signal received from
the ABS actuator and elec
tric unit (control
unit) remains abnormal for 2 seconds or more.  ABS actuator and electric unit (control unit)
BCM
Revision: 2010 May2011 QX56

BCS
B2562 LOW VOLTAGEBCS-73
< DTC/CIRCUIT DIAGNOSIS >
C
DE
F
G H
I
J
K L
B A
O P
N
B2562 LOW VOLTAGE
DTC LogicINFOID:0000000006274837
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION
1. Erase DTC.
2. Turn ignition switch OFF.
3. Perform the “Self Diagnostic Result ” of BCM with CONSULT-III, when passed 120 seconds or more after
the ignition switch is turned ON.
Is any DTC detected?
YES >> Refer to BCS-73, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006274838
1.CHECK POWER SUPPLY CIRCUIT
Check BCM power supply circuit. Refer to BCS-75, "
Diagnosis Procedure".
Is the circuit normal?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
NO >> Repair the malfunctioning part.
DTC CONSULT-III display
description DTC Detection Condition Possible cause
B2562 LOW VOLTAGE When the power supply voltage to BCM remains less
than 8.8 V for 120 seconds or more Harness or connector (power supply
circuit)
Revision: 2010 May2011 QX56

BCS-74
< DTC/CIRCUIT DIAGNOSIS >
B26E7 TPMS CAN COMM
B26E7 TPMS CAN COMM
DTC LogicINFOID:0000000006274839
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION
1. Erase the DTC.
2. Turn ignition switch OFF.
3. Perform the “Self Diagnostic Result” of BCM with CONS ULT-III, when passed 2 seconds or more after the
ignition switch is turned ON.
Is any DTC detected?
YES >> Refer to BCS-74, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006274840
NOTE:
If DTC “B26E7” detected along with DTC “U1000” , first diagnose the DTC “U1000”. Refer to BCS-70, "
Diagno-
sis Procedure".
1.LOW TIRE PRESSURE WARNING CONTRO L UNIT SELF DIAGNOSTIC RESULT
Perform “Self Diagnostic Result” of low tire pressu re warning control unit with CONSULT-III. Refer to WT-12,
"CONSULT-III Function".
Is any DTC detected?
YES >> GO TO 2.
NO >> GO TO 4.
2.LOW TIRE PRESSURE WARNING CONTROL UNIT DIAGNOSIS
Perform low tire pressure warning control uni t component diagnosis of detected DTC. Refer to WT-18, "
DTC
Index".
>> GO TO 3.
3.BCM SELF DIAGNOSTIC RESULT
Erase DTC of BCM, and perform “Self Diagnostic Result” again.
Is DTC
“B26E7” detected?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
NO >> INSPECTION END
4.REPLACE LOW TIRE PRESSURE WA RNING CONTROL UNIT TEMPORARILY
Remove low tire pressure warning control unit, and in stall normal low tire pressure warning control unit.
>> GO TO 5.
5.BCM SELF-DIAGNOSTIC RESULT
Erase DTC of BCM, and perform “S elf Diagnostic Result” of BCM again.
Is DTC
“B26E7” detected?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
NO >> Replace low tire pressure warning control unit. Refer to WT-65, "
Removal and Installation".
DTC CONSULT-III display description DTC Detection Condition Probable cause
B26E7 TPMS CAN COMM When ignition switch is ON, BCM cannot re-
ceived CAN communication signal from low
tire pressure warn
ing control unit.  CAN communication system
 Low tire pressure warning control unit
BCM
Revision: 2010 May2011 QX56

BCS
POWER SUPPLY AND GROUND CIRCUITBCS-75
< DTC/CIRCUIT DIAGNOSIS >
C
DE
F
G H
I
J
K L
B A
O P
N
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000006274841
1.CHECK FUSE AND FUSIBLE LINK
Check that the following fuse and fusible link are not blown.
Is the fuse fusing?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is blown.
NO >> GO TO 2.
2.CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connectors.
3. Check voltage between BCM harness connector and ground.
Is the measurement value normal?
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
Does continuity exist?
YES >> INSPECTION END
NO >> Repair harness or connector.
Signal name Fuse and fusible link No.
Battery power supply K
10
Te r m i n a l s
Vo l ta g e
(Approx.)
(+) (
−)
BCM
Ground
Connector Terminal
M70 70
Battery voltage
57
BCM
GroundContinuity
Connector Terminal
M70 67 Existed
Revision: 2010 May2011 QX56