2008 INFINITI QX56 ignition

INSPECTION AND ADJUSTMENTWT-5
< BASIC INSPECTION >
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INSPECTION AND ADJUSTMENT
Preliminary CheckINFOID:0000000001735372
1.TIRE PRESSURE
Check all tire pressures. Refer to WT-51, "
Tire".
Do tire pressures match specification?
YES >> GO TO 2.
NO >> Adjust tire pressures to specified value.
2.LOW TIRE PRESSURE WARNING LAMP
Check low tire pressure warning lamp activation.
Does the low tire pressure warning lamp activate for one second when ignition switch is turned ON?
YES >> GO TO 3.
NO >> GO TO WT-35, "
Low Tire Pressure Warning Lamp Does Not Come On When Ignition Switch Is
Turned On".
3.BCM CONNECTOR
1. Disconnect BCM harness connectors.
2. Check terminals for damage or loose connections.
3. Reconnect harness connectors.
Are BCM connectors damaged or loose?
YES >> Repair or replace damaged parts.
NO >> GO TO 4.
4.TRANSMITTER ACTIVATION TOOL
Check battery in transmitter activation tool.
Is transmitter activation tool battery fully charged?
YES >> Perform self-diagnosis. Refer to WT-31, "Self-Diagnosis (With CONSULT-III)".
NO >> Replace battery in transmitter activation tool.
Transmitter Wake Up OperationINFOID:0000000001735373
NOTE:
This procedure must be done after replacement of a low tire pressure warning transmitter or BCM.
New replacement transmitters are provided "asleep" and must first be "woken up" using Transmitter
Activation Tool J-45295 before ID registration can be performed.
1. Turn ignition switch ON. Push the transmitter activation tool against the tire near the front left transmitter. Press the button for
5 seconds. The hazard warning lamps flash per the following
diagram.
2. Repeat this procedure for each tire in the following order: FL, FR, RR, RL. Tool number : (J-45295)
LEIA0036E
Revision: March 2010
2008 QX56

WT-8
< FUNCTION DIAGNOSIS >
TPMS
FUNCTION DIAGNOSIS
TPMS
System DiagramINFOID:0000000001735375
System DescriptionINFOID:0000000001735376
BODY CONTROL MODULE (BCM)
The BCM is shown with the lower instrument panel LH removed. The
BCM reads the air pressure signal received by the remote keyless
entry receiver, and controls the low tire pressure warning lamp as
shown below. It also has a self-d iagnosis function to detect a system
malfunction.
TRANSMITTER
A sensor-transmitter integrated with a valve is installed in each
wheel, and transmits a detected air pr essure signal in the form of a
radio wave. The radio signal is received by the remote keyless entry
receiver.
REMOTE KEYLESS ENTRY RECEIVER
ALEIA0004GB
Condition Low tire pressure warning lamp
System normal On for 1 second after ignition ON
Tire less than 193 kPa (2.0 kg/cm
2 , 28 psi)
[Flat tire] ON
TPMS malfunction After key ON, flashes once per sec-
ond for 1 minute, then stays ON
LEIA0068E
WEIA0137E
Revision: March 2010 2008 QX56

TPMSWT-9
< FUNCTION DIAGNOSIS >
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The remote keyless entry receiver is shown with the instrument
panel RH removed. The remote keyless entry receiver receives the
air pressure signal transmitted by the transmitter in each wheel.
COMBINATION METER
The combination meter receives tire pressure status from the BCM
using CAN communication. When a low tire pressure condition is
sensed by the BCM, the combination meter low tire pressure warn-
ing lamp is activated.
TIRE PRESSURE WARNING CHECK CONNECTOR
The tire pressure warning check connector can be grounded in order
to initiate self-diagnosis without a CONSULT-III. Refer to WT-12,
"Self-Diagnosis (Without CONSULT-III)". The tire pressure warning
check connector is located behind the lower portion of the instrument
panel LH.
DISPLAY UNIT
Displays the air pressure of each tire.
NOTE:
After the ignition switch is turned on, the pressure values will not be
displayed until the data of each wheel is received.
LEIA0069E
LEIA0055E
LEIA0068E
AWEIA0017GB
Revision: March 2010 2008 QX56

DIAGNOSIS SYSTEM (BCM)WT-11
< FUNCTION DIAGNOSIS >
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DIAGNOSIS SYSTEM (BCM)
CONSULT-III Function (BCM)INFOID:0000000001735378
CONSULT-III DIAGNOSTIC MODES
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
DESCRIPTION
During driving, the tire pressure monitoring system receives the signal transmitted from the transmitter
installed in each wheel, and turns on the low tire pressure warning lamp when the tire pressure becomes low.
The control unit (BCM) for this system has pr essure judgement and self-diagnosis functions.
FUNCTION
When the tire pressure monitoring system detects low infl ation pressure or an internal malfunction, the low tire
pressure warning lamp in the combination meter comes on. The malfunction is indicated by the low tire pres-
sure warning lamp flashing.
CONSULT-III Application to Ti re Pressure Monitoring System
× : Applicable
– : Not applicable
Data Monitor Mode
Diagnostic mode Description
WORK SUPPORT Supports inspections and adjustments. Commands are transmitted to the BCM
for setting the status suitable for required operation, input/output signals are re-
ceived from the BCM and received data is displayed.
DATA MONITOR Displays BCM input/output data in real time.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
SELF-DIAG RESULTS Displays BCM self-diagnosis results.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ECU PART NUMBER BCM part number can be read.
CONFIGURATION Performs BCM configuration read/write functions.
ITEMSELF-DIAGNOSTIC RESULTS DATA MONITOR
Front - Left transmitter ××
Front - Right transmitter ××
Rear - Left transmitter ××
Rear - Right transmitter ××
Warning lamp —×
Vehicle speed ××
CAN Communication ××
MONITORCONDITION SPECIFICATION
VHCL SPEED Drive vehicle. Vehicle speed (km/h or MPH)
AIR PRESS FL
AIR PRESS FR
AIR PRESS RR
AIR PRESS RL • Drive vehicle for a few minutes.
Tire pressure (kPa or psi)
or
• Ignition switch ON and activation tool is transmitting activation signals.
Revision: March 2010 2008 QX56

WT-12
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (BCM)
NOTE:
Before performing the self-diagnosis, be sure to register the ID, or the actual malfunction location may be different from that displayed on
CONSULT-III.
Self-Diagnosis (Without CONSULT-III)INFOID:0000000004291535
SELF-DIAGNOSTIC PROCEDURE (WITHOUT CONSULT-III)
1. Turn ignition switch ON.
2. Ground the tire pressure warning check connector to initiate self diagnosis.
3. Compare the flashing pattern with the flash code chart below.
NOTE:
The system is normal when the low tire pressure warning lamp flashes 5 times and continues repeating. Self-
diagnosis results are erased automatically by turning the ignition switch “OFF”.
ID REGST FL1
ID REGST FR1
ID REGST RR1
ID REGST RL1Ignition switch ON ID not registered: YET
ID registered: DONE
WARNING LAMP Low tire pressure
warning lamp on: ON
Low tire pressure warning lamp off: OFF
MONITOR
CONDITION SPECIFICATION
Flash Code Malfunction partReference
page
15
16
17
18 Tire pressure dropped below specified value. Refer to
WT-8, "
System
Description". —
21
22
23
24 Transmitter no data (FL)
Transmitter no data (FR)
Transmitter no data (RR)
Transmitter no data (RL)
WT-14
31
32
33
34Transmitter chec
ksum error (FL)
Transmitter chec ksum error (FR)
Transmitter chec ksum error (RR)
Transmitter chec ksum error (RL) WT-16
35
36
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38Transmitter pressure
data error (FL)
Transmitter pressure data error (FR)
Transmitter pressure data error (RR)
Transmitter pressure data error (RL) WT-18
41
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44Transmitter function
code error (FL)
Transmitter function code error (FR)
Transmitter function code error (RR)
Transmitter function code error (RL) WT-16
45
46
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48Transmitter battery voltage low (FL)
Transmitter battery voltage low (FR)
Transmitter battery voltage low (RR)
Transmitter battery voltage low (RL)
WT-16
ALEIA0050GB
Revision: March 2010
2008 QX56

DIAGNOSIS SYSTEM (BCM)WT-13
< FUNCTION DIAGNOSIS >
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52 Vehicle speed signal WT-19
54Vehicle ignition signal WT-20
Flash CodeMalfunction partReference
page
Revision: March 2010 2008 QX56

WT-20
< COMPONENT DIAGNOSIS >
C1735 IGNITION SIGNAL
C1735 IGNITION SIGNAL
DescriptionINFOID:0000000004291539
The BCM monitors the IGN ON signal on the CAN line and compares it to it’s direct IGN ON signal. When
these two signals do not match, the BCM sets C1735.
DTC LogicINFOID:0000000004291540
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
1. On SELECT DIAG MODE, select the SELF-DIAG RESULT screen.
2. Check display contents on SELF DIAG RESULT screen.
Is C1735 displayed in the self-diagnosis display?
YES >> Refer to WT-20, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000004291541
MALFUNCTION CODE NO. 54 (DTC C1735)
1.CAN IGNITION SIGNAL
Check BCM IGN RLY signal with CONSULT-III. Refer to WT-21, "
Reference Value".
Are the inspection results normal with the ignition switch ON?
YES >> GO TO 2.
NO >> Check CAN system. Refer to LAN-14, "
Trouble Diagnosis Flow Chart".
2.BCM POWER SUPPLY
Check BCM power supply (ignition ON). Refer to BCS-32, "
Diagnosis Procedure".
Is the power supply with the ignition switch ON normal?
YES >> GO TO 3.
NO >> Repair power supply as necessary.
3.DRIVE VEHICLE
Clear DTC and then test drive the vehicle and check the low tire pressure warning lamp.
Does the vehicle operate without any low tire pressure warning lamp?
YES >> Inspection End.
NO >> Replace BCM. Refer to BCS-55, "
Removal and Installation".
Special Repair RequirementINFOID:0000000004291545
Perform preliminary check. Refer to WT-5, "Preliminary Check".
DTCCONSULT - III DTC detecting condition
C1735 IGNITION SIGNAL LINE - BCM/TPMS BCM has detected a mismatch between IGN ON signals.
Revision: March 2010 2008 QX56

WT-22
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
HEADLAMP SW1Headlamp switch OFF OFF
Headlamp switch 1st
ON
HEADLAMP SW2 Headlamp switch OFF
OFF
Headlamp switch 1st ON
HI BEAM SW High beam switch OFF
OFF
High beam switch HI ON
IGN ON SW Ignition switch OFF or ACC
OFF
Ignition switch ON ON
IGN SW CAN Ignition switch OFF or ACC
OFF
Ignition switch ON ON
INT VOLUME Wiper intermittent dial is in a dial position 1 - 7 1 - 7
I-KEY LOCK LOCK button of Intelligent Key is not pressed
OFF
LOCK button of Intelligent Key is pressed ON
I-KEY UNLOCK UNLOCK button of Intelligent Key is not pressed
OFF
UNLOCK button of Intelligent Key is pressed ON
KEY ON SW Mechanical key is removed from key cylinder
OFF
Mechanical key is inserted to key cylinder ON
OIL PRESS SW • Ignition switch OFF or ACC
• Engine running
OFF
Ignition switch ON ON
PASSING SW Other than lighting switch PASS
OFF
Lighting switch PASS ON
REAR DEF SW Rear window defogger switch OFF
OFF
Rear window defogger switch ON ON
RR WASHER SW Rear washer switch OFF
OFF
Rear washer switch ON ON
RR WIPER INT Rear wiper switch OFF
OFF
Rear wiper switch INT ON
RR WIPER ON Rear wiper switch OFF
OFF
Rear wiper switch ON ON
RR WIPER STOP Rear wiper stop position
OFF
Other than rear wiper stop position ON
TAIL LAMP SW Lighting switch OFF
OFF
Lighting switch 1ST ON
TRNK OPNR SW When back door opener switch is not pressed
OFF
When back door opener switch is pressed ON
TURN SIGNAL L Turn signal switch OFF
OFF
Turn signal switch LH ON
TURN SIGNAL R Turn signal switch OFF
OFF
Turn signal switch RH ON
VEHICLE SPEED While driving Equivalent to speedometer reading
Monitor Item
Condition Value/Status
Revision: March 2010 2008 QX56