2011 INFINITI QX56 ECU

WCS
BCM (BODY CONTROL MODULE)WCS-31
< ECU DIAGNOSIS INFORMATION >
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BCM (BODY CONTROL MODULE)
List of ECU ReferenceINFOID:0000000006222524
ECU Reference
BCM BCS-33, "
Reference Value"
BCS-54, "Fail-safe"
BCS-56, "DTCInspectionPriorityChart"
BCS-57, "DTCIndex"
Revision: 2010 May2011 QX56

WT-1
SUSPENSION
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SECTION WT
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WT
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O PCONTENTS
ROAD WHEELS & TIRES
PRECAUTION ................ ...............................3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
3
Service Notice or Precautions for TPMS ...................4
Service Notice or Precautions for Road Wheel .........4
PREPARATION ............................................5
PREPARATION .............................................. .....5
Special Service Tools .......................................... ......5
Commercial Service Tools ........................................5
SYSTEM DESCRIPTION ..............................6
COMPONENT PARTS ................................... .....6
Component Parts Location .................................. ......6
Component Description .............................................7
Low Tire Pressure Warning Control Unit ...................7
Transmitter ................................................................7
Tire Pressure Receiver .............................................8
Low Tire Pressure Warning Lamp .............................8
SYSTEM ..............................................................9
System Description ............................................. ......9
Tire Inflation Indicator Function ...............................10
DIAGNOSIS SYSTEM (LOW TIRE PRES-
SURE WARNING CONTROL UNIT) ..................
12
CONSULT-III Function ........................................ ....12
ECU DIAGNOSIS INFORMATION ..............14
LOW TIRE PRESSURE WARNING CON-
TROL UNIT ..................................................... ....
14
Reference Value ................................................. ....14
DTC Inspection Priority Chart .................................17
DTC Index ...............................................................18
WIRING DIAGRAM ......................................19
TIRE PRESSURE MONITORING SYSTEM ......19
Wiring Diagram .................................................... ....19
BASIC INSPECTION ...................................25
DIAGNOSIS AND REPAIR WORK FLOW .......25
Work Flow ............................................................ ....25
ADDITIONAL SERVICE WHEN REPLACING
LOW TIRE PRESSURE WARNING CON-
TROL UNIT ........................................................
27
Description ...............................................................27
Work Procedure .......................................................27
TRANSMITTER WAKE UP OPERATION .........28
Description ...............................................................28
Work Procedure .......................................................28
ID REGISTRATION ...........................................29
Description ...............................................................29
Work Procedure .......................................................29
DTC/CIRCUIT DIAGNOSIS .........................31
C1704, C1705, C1706, C1707 LOW TIRE
PRESSURE .......................................................
31
DTC Logic ............................................................ ....31
Diagnosis Procedure ...............................................31
C1708, C1709, C1710, C1711 TRANSMITTER
(NO DATA) ........................................................
33
DTC Logic ............................................................ ....33
Diagnosis Procedure ...............................................33
C1716, C1717, C1718, C1719 TRANSMITTER
(PRESSURE DATA) ..........................................
37
DTC Logic ............................................................ ....37
Diagnosis Procedure ...............................................37
C1728 RECEIVER ID ........................................39
Revision: 2010 May2011 QX56

WT-12
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL UNIT)
DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL
UNIT)
CONSULT-III FunctionINFOID:0000000006225496
APPLICATION ITEMS
CONSULT-III performs the following functions in combinat ion of data reception, instruction, and transmission
via communication lines from low tire pressure warning control unit.
*: The following diagnosis information is erased by erasing.
DTC
ECU IDENTIFICATION
Part number of low tire pressure warning control unit is displayed.
SELF DIAGNOSIS RESULTS
Refer to WT-18, "DTC Index".
DATA MONITOR
ACTIVE TEST
NOTE:
After completing the work below, perform an active test.
1. Check ID registration state and perform self-diagnosis.
2. Erase the self-diagnosis result history.
Mode FUNCTION DESCRIPTION
ECU IDENTIFICATION Displays the part number of low tire pressure warning control unit.
SELF-DIAGNOSIS RESULTS Self-diagnosis result can be quickly read.
*
DATA MONITOR Input and output data of low tire pressure warning control unit can be read.
ACTIVE TESTSends command to the low tire pressure warning control unit to change output signals and check
operation of output system.
WORK SUPPORT Components can be quickly and accurately adjusted.
Monitor item (Unit) Remarks
VHCL SPEED SE
[(km/h) or (MPH)] Vehicle speed is displayed.
AIR PRESS FL
[(kPa), (kg/cm
2) or (Psi)] Air pressure of front LH tires is displayed.
AIR PRESS FR
[(kPa), (kg/cm
2) or (Psi)] Air pressure of front RH tires is displayed.
AIR PRESS RR
[(kPa), (kg/cm
2) or (Psi)] Air pressure of rear
RH tires is displayed.
AIR PRESS RL
[(kPa), (kg/cm
2) or (Psi)] Air pressure of rear
LH tires is displayed.
ID REGST FL1 ID registration status of front LH transmitter is displayed.
ID REGST FR1 ID registration status of front RH transmitter is displayed.
ID REGST RR1 ID registration status of rear RH transmitter is displayed.
ID REGST RL1 ID registration status of rear LH transmitter is displayed.
WARNING LAMP Control status of low tire pressure warning lamp is displayed.
BUZZER Control status of buzzer in combination meter by low tire pressure warning con-
trol unit is displayed.
NOTE:
Not use in TPMS, but displayed.
Revision: 2010 May2011 QX56

WT-14
< ECU DIAGNOSIS INFORMATION >
LOW TIRE PRESSURE WARNING CONTROL UNIT
ECU DIAGNOSIS INFORMATION
LOW TIRE PRESSURE WARNING CONTROL UNIT
Reference ValueINFOID:0000000006225497
VALUES ON THE DIAGNOSIS TOOL
CAUTION:
The reference values in the table below come from the control unit calculation data. The normal values
may in some cases be displayed even though the power circuit (harness) is open or shorted.
TERMINAL LAYOUT
PHYSICAL VALUES
CAUTION:
When using circuit tester to measure voltage for in spection, be sure not to extend forcibly any con-
nector terminals.
Monitor item Condition Value/Status
VHCL SPEED SE Vehicle stopped 0.00 km/h (0.00 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition. Approx. equal to the indication
on speedometer (Inside of
±
10%)
AIR PRESS FL Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
front LH tire
AIR PRESS FR Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
front RH tire
AIR PRESS RR Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
rear RH tire
AIR PRESS RL Start engine and drive at 40 km/h (25 MPH) or more for 10 minutes. Approximately equal to the indi-
cation on tire gauge value for
rear LH tire
ID REGST FL1 Front LH transmitter ID registered Done
Front LH transmitter ID unregistered Yet
ID REGST FR1 Front RH transmitter ID registered Done
Front RH transmitter ID unregistered Yet
ID REGST RR1 Rear RH transmitter ID registered Done
Rear RH transmitter ID unregistered Yet
ID REGST RL1 Rear LH transmitter ID registered Done
Rear LH transmitter ID unregistered Yet
WARNING LAMP Low tire pressure
warning lamp: ON On
Low tire pressure warning lamp: OFF Off
JSEIA0024ZZ
Revision: 2010 May2011 QX56

LOW TIRE PRESSURE WARNING CONTROL UNIT
WT-15
< ECU DIAGNOSIS INFORMATION >
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Te r m i n a l N o . (Wire color) Description
Condition Value (Approx.)
Signal name Input/
Output
1
(P) —CAN-L Input/
Output ——
2
(L) —CAN-H Input/
Output ——
3
(O/L) Ground Tire pressure receiver rear
RH signal Input Ignition switch ONStandby status
Approx. 4.5 V
When signal is
received Approx. 4.5 V
4
(L) Ground
Tire pressure receiver rear
LH signal Input Ignition switch ONStandby status
Approx. 4.5 V
When signal is
received Approx. 4.5 V
OCC3879D
OCC3880D
OCC3879D
OCC3880D
Revision: 2010 May2011 QX56

WT-16
< ECU DIAGNOSIS INFORMATION >
LOW TIRE PRESSURE WARNING CONTROL UNIT
5
(R/L) Ground
Tire pressure receiver front
RH signal Input Ignition switch ONStandby status
Approx. 4.5 V
When signal is
received Approx. 4.5 V
6
(W/G) Ground Tire pressure receiver front
LH signal
Input Ignition switch ONStandby status
Approx. 4.5 V
When signal is
received Approx. 4.5 V
7
(SB) Ground Tire pressure receiver rear
RH power supply*
OutputIgnition switch ON Approx. 9 - 16 V
Ignition switch OFF 0 V
8
(GR) Ground Tire pressure receiver rear
LH power supply*
OutputIgnition switch ON Approx. 9 - 16 V
Ignition switch OFF 0 V
9
(R/W) Ground Tire pressure receiver front
RH power supply*
OutputIgnition switch ON Approx. 9 - 16 V
Ignition switch OFF 0 V
10
(LG) Ground Tire pressure receiver front
LH power supply*
OutputIgnition switch ON Approx. 9 - 16 V
Ignition switch OFF 0 V
15
(GR) Ground Power supply Input Ignition switch ON Battery voltage
Ignition switch OFF 0 V
19
(L/R) Ground Tire pressure receiver rear
RH signal (sensitivity) InputIgnition switch ON Approx. 0.7 V
Ignition switch OFF 0 V
20
(P) Ground Tire pressure receiver rear
LH signal (sensitivity) InputIgnition switch ON Approx. 0.7 V
Ignition switch OFF 0 V
Te r m i n a l N o .
(Wire color) Description
Condition Value (Approx.)
Signal name Input/
Output
OCC3879D
OCC3880D
OCC3879D
OCC3880D
Revision: 2010 May2011 QX56

LOW TIRE PRESSURE WARNING CONTROL UNIT
WT-17
< ECU DIAGNOSIS INFORMATION >
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*: Power is supplied to the tire pressure receiver from the low tire pressure warning control unit.
DTC Inspection Priority ChartINFOID:0000000006225498
If some DTCs are displayed at the same time, per form inspections one by one based on the following priority-
chart.
21
(G/R) Ground
Tire pressure receiver front
RH signal (sensitivity) InputIgnition switch ON Approx. 0.7 V
Ignition switch OFF 0 V
22
(BR/Y) Ground
Tire pressure receiver front
LH signal (sensitivity) InputIgnition switch ON Approx. 0.7 V
Ignition switch OFF 0 V
23
(V/W) Ground Tire pressure receiver rear
RH ground
Input Always 0 V
24
(R/B) Ground
Tire pressure receiver rear
LH ground Input Always 0 V
25
(W/L) Ground Tire pressure receiver front
RH ground Input Always 0 V
26
(BR/W) GroundTire pressure receiver front
LH ground
Input Always 0 V
32
(B) Ground Ground — Always 0 V
Te r m i n a l N o .
(Wire color) Description
Condition Value (Approx.)
Signal name Input/
Output
Priority Detected items (DTC)
1  U1000 CAN COMM CIRCUIT
 U1010 CONTROL UNIT (CAN)
2  C1704 LOW PRESSURE FL
 C1705 LOW PRESSURE FR
 C1706 LOW PRESSURE RR
 C1707 LOW PRESSURE RL
3  C1755 PR RECEIV COND FL
 C1756 PR RECEIV COND FR
 C1757 PR RECEIV COND RR
 C1758 PR RECEIV COND RL
4  C1708 [NO DATA] FL
 C1709 [NO DATA] FR
 C1710 [NO DATA] RR
 C1711 [NO DATA] RL
5  C1716 [PRESSDATA ERR] FL
 C1717 [PRESSDATA ERR] FR
 C1718 [PRESSDATA ERR] RR
 C1719 [PRESSDATA ERR] RL
7  C1728 RECEIVER ID NO REG
8  C1729 VHCL SPEED SIG ERR
9  C1750 [RECEIVER ERR] FL
 C1751 [RECEIVER ERR] FR
 C1752 [RECEIVER ERR] RR
 C1753 [RECEIVER ERR] RL
10  C1754 CONT UNIT (EEPROM)
Revision: 2010 May2011 QX56

WT-18
< ECU DIAGNOSIS INFORMATION >
LOW TIRE PRESSURE WARNING CONTROL UNIT
DTC Index
INFOID:0000000006225499
NOTE:
If some DTCs are displayed at the same time, refer to WT-17, "
DTC Inspection Priority Chart".
DTC Items (CONSULT-III screen terms) Reference
C1704 LOW PRESSURE FL
WT-31, "
DTC Logic"C1705 LOW PRESSURE FR
C1706 LOW PRESSURE RR
C1707 LOW PRESSURE RL
C1708 [NO DATA] FLWT-33, "
DTC Logic"C1709 [NO DATA] FR
C1710 [NO DATA] RRC1711 [NO DATA] RL
C1716 [PRESSDATA ERR] FL
WT-37, "
DTC Logic"C1717 [PRESSDATA ERR] FR
C1718 [PRESSDATA ERR] RR
C1719 [PRESSDATA ERR] RL
C1728 RECEIVER ID NO REGWT-39, "
DTC Logic"
C1729 VHCL SPEED SIG ERRWT-41, "DTC Logic"
C1750 [RECEIVER ERR] FL
WT-42, "
DTC Logic"C1751 [RECEIVER ERR] FR
C1752 [RECEIVER ERR] RR
C1753 [RECEIVER ERR] RL
C1754 CONT UNIT (EEPROM)WT-45, "
DTC Logic"
C1755 PR RECEIV COND FL
WT-47, "
DTC Logic"C1756 PR RECEIV COND FR
C1757 PR RECEIV COND RR
C1758 PR RECEIV COND RL
U1000 CAN COMM CIRCUITWT-49, "
DTC Logic"
U1010 CONTROL UNIT (CAN)WT-50, "DTC Logic"
Revision: 2010 May2011 QX56