warning INFINITI QX56 2011 Factory Service Manual

WT-8
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Tire Pressure Receiver
INFOID:0000000006225492
The front tire pressure receiver (1) and rear tire pressure receiver (2)
receive the tire pressure signal by radio waves from the transmitter
at each wheel, and transmit the tire pressure signal to the low tire
pressure warning control unit.
Low Tire Pressure Warning LampINFOID:0000000006225493
Uses CAN communication from the low tire pressure warning control
unit to illuminate the low tire pressure warning lamp on the combina-
tion meter.
*: Tire pressure at each condition differs. A: Front side
B : Rear side
JPEIC0070ZZ
NNEIC0001ZZ
Condition Low tire pr
essure warning lamp
Ignition switch: OFF OFF
Ignition switch: ON Warning lamp turns on for 1second, then turns OFF.
When tire pressure is low*.
[Less than 189 kPa (1.93 kg/cm
2, 27.4 psi)] ON
Tire pressure monitoring system malfunction Warning lamp blinks 1 minute, then turns ON.
Revision: 2010 May2011 QX56

SYSTEMWT-9
< SYSTEM DESCRIPTION >
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SYSTEM
System DescriptionINFOID:0000000006225494
 During driving, the TPMS (Tire Pressure Monitoring System) receives the signal transmitted from transmitter
installed in each wheel. The low tire pressure warning control unit has pressure judgment and trouble diag-
nosis functions. When the low tire pressure warning control unit detects low inflation pressure or another
unusual symptom, the low tire pressure warning lamps in the combination meter comes on.
 If the tire pressure is less than the specified value, t he low tire pressure warning lamp illuminates that the tire
pressure is less than the specified value.
 Activates the TPMS (Tire Pressure Monitoring Sy stem) when the vehicle speed is 40 km/h (25 MPH) or
more.
 The tire pressure information for each wheel is displayed on the vehicle information display.
 Added tire inflation indicator function to TPMS (Tire Pressure Monitoring System). Refer to WT-10, "
Tire
Inflation Indicator Function".
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL
The signal transmission/reception between units via a comm unication line is mainly as listed in the following
table.
JPEIC0084GB
Component parts Signal item
Low tire pressure warning control
unit Transmits the following signals via CAN communication to BCM.
 Low tire pressure
warning lamp signal
 Hazard request signal
 Horn request signal*
Transmits the following signals via CAN communication to the AV control unit.
 Low tire pressure warning lamp signal
 Tire pressure data signal
BCM Transmits the following signal via CAN communication to the combination meter, based on sig-
nals from low tire pressure warning control unit.
 Low tire pressure
warning lamp signal
Transmits the following signal via CAN communication to the IPDM E/R, based on signals from
low tire pressure wa rning control unit.
 Horn request signal*
Receives the following signal via CAN communication from low tire pressure warning control
unit.
 Hazard request signal
AV control unit Receives the following signals via CAN communication from low tire pressure warning control
unit.
 Low tire pressure
warning lamp signal
 Tire pressure data signal
Revision: 2010 May2011 QX56

WT-10
< SYSTEM DESCRIPTION >
SYSTEM
*: Mainly used for the tire inflation indicator function.
LOW TIRE PRESSURE WARNING LAMP CONTROL CONDITION
Uses CAN communication from the low tire pressure warning control unit to illuminate the low tire pressure
warning lamp on the combination meter.
*: Tire pressure at each condition differs.
HAZARD WARNING LAMP CONTROL CONDITION
The low tire pressure warning control unit transmits a hazard request signal to BCM. BCM blinks the hazard
warning lamp, according to the signal.
The hazard warning lamp blinks under the following conditions.
Condition of Blinking The Hazard Warning Lamp When wake-up of registered wheel has been completed. Refer to WT-28, "Work Procedure".
 When ID registration is completed. Refer to WT-29, "
Work Procedure".
 During the use of the tire inflation indicator function.
HORN CONTROL CONDITION
The low tire pressure warning control unit transmits a horn request signal to BCM. BCM controls horn sound,
according to the signal.
The horn sounds under the following condition.
Condition of Sounding Horn During the use of tire inflation indicator function.
Tire Inflation Indicator FunctionINFOID:0000000006225495
 This function operates only when the A/T shift selector position is in P-range with the ignition switch ON or
with the engine started.
NOTE:
The tire inflation indicator function is recommended to use with the engine stopped.
 This function informs the driver of the satisfaction of the recom- mended COLD tire pressure.
The hazard warning lamp blinks when reaching the recommended
COLD tire pressure during radio wave reception. After reaching the
recommended COLD tire pressure, the horn sounds once and the
hazard warning lamp stops blinking.
 When tire pressure becomes a value equal to or more than 30 kPa
(0.31 kg/cm
2, 4 psi) more than the recommended COLD tire pres-
sure, the hazard warning lamp and the horn operates three times.
After deflating the tire and reaching the recommended COLD tire
pressure, the horn sounds only once and the hazard warning lamp
stops blinking.
NOTE:
 After starting to inflate the tire, it takes a few seconds for the tire inflation indicator to function.
ABS actuator and electric unit (con-
trol unit) Transmits the vehicle speed signal (ABS) via CAN communication for low tire pressure warning
control unit.
TCM
*Transmits the P range signal via CAN communication for low tire pressure warning control unit.
Component parts Signal item
Condition Low tire pr
essure warning lamp
Ignition switch: OFF OFF
Ignition switch: ON (System normal) Warning lamp turns on for 1second, then turns OFF.
When tire pressure is low*.
[Less than 189 kPa (1.93 kg/cm
2, 27.4 psi)] ON
Tire pressure monitoring system malfunction Warning lamp blinks 1 minute, then turns ON.
When performing transmitter wake-up operation Refer to WT-28, "
Work Procedure".
JSEIA0214GB
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

DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL UNIT)
WT-13
< SYSTEM DESCRIPTION >
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WORK SUPPORT
Test item Condition Description
BUZZER  Vehicle stopped
 The system is normal This test is able to check to
check that the buzzer operates.
NOTE:
Not use in TPMS, but displayed.
WARN LAMP This test is able to check to check that the low tire pressure warning lamp
turns on.
Item Usage
ID REGIST Use to ID registration. Refer to WT-29, "
Work Procedure".
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