2011 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2011 Factory Service Manual
COMPONENT PARTSWT-7
< SYSTEM DESCRIPTION >
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Component DescriptionINFOID:0000000006225489
*: Mainly used for the tire inflation function.
Low Tire Pressure Warning Contr

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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

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INFINITI QX56 2011 Factory Service Manual
SYSTEMWT-9
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System DescriptionINFOID:0000000006225494
During driving, the TPMS (Tire Pressure Monitoring System) receives the signal tr

SYSTEMWT-9
< SYSTEM DESCRIPTION >
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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

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INFINITI QX56 2011 Factory Service Manual
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 warnin

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

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INFINITI QX56 2011 Factory Service Manual
SYSTEMWT-11
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If there is no response for approximately 15 seconds or mo re after inflating the tires, cancel the use of the
tire inflation indi

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INFINITI QX56 2011 Factory Service Manual
WT-12
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL UNIT)
DIAGNOSIS SYSTEM (LOW TIRE PRESSURE WARNING CONTROL
UNIT)
CONSULT-III FunctionINFOID:0000000006225496
APPLICATI

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

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INFINITI QX56 2011 Factory Service Manual
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 sys

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INFINITI QX56 2011 Factory Service Manual
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 DIAGNO

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