2011 INFINITI QX56 ECU

BCS
BCM
BCS-49
< ECU DIAGNOSIS INFORMATION >
C
D E
F
G H
I
J
K L
B A
O P
N
78
(P/B) Ground
Driver door antenna
(+) OutputWhen the driver
door request
switch is operat-
ed with ignition
switch OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
79
(V) Ground Driver door antenna
(-)
OutputWhen the driver
door request
switch is operat-
ed with ignition
switch OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
80
(LG/B) Ground Passenger door an-
tenna (+) OutputWhen the pas-
senger door re-
quest switch is
operated with
ignition 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-50
< ECU DIAGNOSIS INFORMATION >
BCM
81
(Y/R) Ground
Passenger door an-
tenna (-) OutputWhen the pas-
senger door re-
quest switch is
operated with
ignition switch
OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
82
(W/G) Ground Back door antenna
(+)
OutputWhen the back
door request
switch is operat-
ed with ignition
switch OFF When Intelligent Key is
not in the antenna detec-
tion area
When Intelligent Key is in
the antenna detection
area
83
(B/W) Ground Back door antenna (-
) OutputWhen the back
door request
switch is operat-
ed with ignition
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-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-56
< ECU DIAGNOSIS INFORMATION >
BCM
FAIL-SAFE CONTROL BY RAIN SENSOR MALFUNCTION
BCM detects the light and rain sensor serial link error and the rain sensor malfunction.
BCM controls the following fail-safe when rain sensor has a malfunction.
 Front wiper switch AUTO and sensing rain drop: The condition just before the activation of fail-safe is main-
tained until the front wiper switch is turned OFF.
 Front wiper switch AUTO and not sensing rain drop: Front wiper is LO operation until the front wiper switch is
turned off.
REAR WIPER MOTOR PROTECTION
BCM detects the rear wiper stopping position acco rding to the rear wiper stop position signal.
When the rear wiper stop position signal does not c hange for more than 5 seconds while driving the rear
wiper, BCM stops power supply to protect the rear wiper motor.
Condition of cancellation
1. More than 1 minute is passed after the rear wiper stop.
2. Turn rear wiper switch OFF.
3. Operate the rear wiper swit ch or rear washer switch.
FAIL-SAFE CONTROL OF COMBINATION SWITCH READING FUNCTION CAUSED BY LOW
POWER SUPPLY VOLTAGE
If voltage of battery power supply lower, BCM maintain s combination switch reading to the status when input
voltage is less than approximately 9 V.
NOTE:
When voltage of battery power supply is approximately 9 V or more, combination switch reading function
returns to normal operation.
DTC Inspection Priority ChartINFOID:0000000006274821
If some DTCs are displayed at the same time, perfo rm inspections one by one based on the following priority
chart.
B26F3: START CONT RLY ON Inhibit engine cranking When the following conditions are fulfilled
 Starter control relay signal (CAN: Transmitted from BCM): OFF
 Starter control relay signal (CAN: Transmitted from IPDM E/R): OFF
B26F4: START CONT RLY OFF Inhibit engine cranking When the following conditions are fulfilled
 Starter control relay signal (CAN: Transmitted from BCM): ON
 Starter control relay signal (CAN: Transmitted from IPDM E/R): ON
B26F7: BCM Inhibit engine cranking
by Intelligent Key sys-
temWhen room antenna and luggage room antenna functions normally
U0415: VEHICLE SPEED Inhibit steering lock When vehicle speed signal (Meter) (CAN) is received normally
Display contents of CONSULT Fail-safe Cancellation
Priority DTC
1 B2562: LOW VOLTAGE
2  U1000: CAN COMM
 U1010: CONTROL UNIT (CAN)
3  B2192: ID DISCORD BCM-ECM
 B2193: CHAIN OF BCM-ECM
 B2195: ANTI-SCANNING
 B2198: NATS ANTENNA AMP
Revision: 2010 May2011 QX56