2004 INFINITI FX35 control

LOW TIRE PRESSURE WARNING SYSTEM
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Revision: 2004 November 2004 FX35/FX45
LOW TIRE PRESSURE WARNING SYSTEMPFP:40300
System ComponentsAES000NO
System DescriptionAES000NP
TRANSMITTER
A sensor-transmitter integrated with a valve is installed on a wheel,
and transmits a detected air pressure signal in the form of a radio
wave.
LOW TIRE PRESSURE WARNING CONTROL UNIT
Reads the radio wave signal received by the antenna, and controls
the warning lamp and the buzzer operations as shown below. It also
has a judgement function to detect a system malfunction.
SEIA0345E
SEIA0203E
SEIA0306E

CAN COMMUNICATION
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Revision: 2004 November 2004 FX35/FX45
CAN COMMUNICATIONPFP:23710
System DescriptionAES000OQ
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Refer to LAN-6, "
CAN COMMUNICATION" .

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TROUBLE DIAGNOSES
Revision: 2004 November 2004 FX35/FX45
Control Unit Input/Output Signal StandardAES000NU
Standards using a circuit tester and oscilloscope.
( ): Wire color
ID Registration ProcedureAES000NV
ID REGISTRATION WITH TRANSMITTER ACTIVATION TOOL
This procedure must do after replace transmitter or low tire pressure warning control unit.
1. Turn ignition switch “OFF”.
2. Connect CONSULT-II and CONSULT-II CONVERTER to data link connector.
3. Touch “AIR PRESSURE MONITOR”, “WORK SUPPORT” and “ID REGIST”.
NOTE:
If “AIR PRESSURE MONITOR” is not indicated, go to GI-40, "
CONSULT-II Data Link Connector (DLC)
Circuit" .
4. With the transmitter activation tool (J-45295) pushed against the
front-left transmitter position of the tire air valve, press the button
then keep 5 seconds.
5. Register the IDs in order from FR LH, FR RH, RR RH or RR LH. When ID registration of each wheel has
been completed, a buzzer sounds and hazard warning lamp blinks.
6. After completing all ID registrations, press “END” to complete the procedure.
NOTE:
Be sure to register the IDs in order from FR LH, FR RH, RR RH, to RR LH, or the self-diagnostic results dis-
play will not function properly.
Measurement terminal
Item Operation or condition
+–
8 (G)
GroundTire pressure warning check
switchAlways Approx. 5 V
9 (L) Data line (CAN H) — —
11 (LG/R) Ignition switch ACC — Battery voltage (Approx. 12 V)
12 (R/W) Battery power supply Always Battery voltage (Approx. 12 V)
20 (B) GND — Approx. 0 V
21 (R) Data line (CAN L) — —
22 (G/Y) HazardHazard lamp switch OFF Battery voltage (Approx. 12 V)
Hazard lamp switch ON Approx. 0 V
24 (G/R) Ignition switch ON — Battery voltage (Approx. 12 V)
25 Antenna — —
SEIA0460E
Activation tire position Buzzer Hazard warning lamp CONSULT-II
Front LH Once
2 times flashing“YET”
↓
“DONE” Front RH 2 times
Rear RH 3 times
Rear LH 4 times

TROUBLE DIAGNOSES
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Revision: 2004 November 2004 FX35/FX45
Self-DiagnosisAES000NX
DESCRIPTION
During driving, the low tire pressure warning system receives the signal transmitted from the transmitter
installed in each wheel, and gives alarms when the tire pressure becomes low. The control unit of this system
has pressure judgement and trouble diagnosis functions.
FUNCTION
When the low tire pressure warning system detects low inflation pressure or another unusual symptom, the
warning lamps in the combination meter comes on. To start the self-diagnostic results mode, ground the self-
diagnostic (check) terminal. The malfunction location is indicated by the warning lamp flashing and the buzzer
sounds.
CONSULT-II
CONSULT-II Main Function
In a diagnosis function (main function), there are “WORK SUPPORT”, “SELF-DIAGNOSTIC RESULTS”,
“DATA MONITOR”, “CAN DIAG SUPPORT MNTR”.
CONSULT-II Application to Low Tire Pressure Warning System
×: Applicable
–: Not applicable
Self-Diagnostic Results Mode
Diagnostic test mode Function
WORK SUPPORTThis mode enables a technician to adjust some devices faster and more accurately by following
the indications on CONSULT-II.
SELF-DIAGNOSTIC
RESULTSSelf-diagnostic results can be read and erased quickly.
DATA MONITOR Input/Output data in the control unit can be read.
CAN DIAG SUPPORT MNTR The results of transmit/receive diagnosis of communication can be read.
ITEM SELF-DIAGNOSTIC RESULTS DATA MONITOR
Front - Left transmitter××
Front - Right transmitter××
Rear - Left transmitter××
Rear - Right transmitter××
Warning lamp−×
Vehicle speed××
Buzzer (in control unit)−×
CAN Communication××
Diagnostic item Diagnostic item is detected when ···
FLAT - TIRE - FL
FLAT - TIRE - FR
FLAT - TIRE - RR
FLAT - TIRE - RLFront-left tire pressure drops to 190 kPa (1.9 kg/cm
2 , 27 psi) or less
Front-right tire pressure drops to 190 kPa (1.9 kg/cm2 , 27 psi) or less
Rear-right tire pressure drops to 190 kPa (1.9 kg/cm2 , 27 psi) or less
Rear-left tire pressure drops to 190 kPa (1.9 kg/cm2 , 27 psi) or less
[NO-DATA] - FL
[NO-DATA] - FR
[NO-DATA] - RR
[NO-DATA] - RLData from front-left transmitter cannot be received.
Data from front-right transmitter cannot be received.
Data from rear-right transmitter cannot be received.
Data from rear-left transmitter cannot be received.
[CHECKSUM- ERR] - FL
[CHECKSUM- ERR] - FR
[CHECKSUM- ERR] - RR
[CHECKSUM- ERR] - RLChecksum data from front-left transmitter is malfunctioning.
Checksum data from front-right transmitter is malfunctioning.
Checksum data from rear-right transmitter is malfunctioning.
Checksum data from rear-left transmitter is malfunctioning.
[PRESSDATA- ERR] - FL
[PRESSDATA- ERR] - FR
[PRESSDATA- ERR] - RR
[PRESSDATA- ERR] - RLAir pressure data from front-left transmitter is malfunctioning.
Air pressure data from front-right transmitter is malfunctioning.
Air pressure data from rear-right transmitter is malfunctioning.
Air pressure data from rear-left transmitter is malfunctioning.

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TROUBLE DIAGNOSES
Revision: 2004 November 2004 FX35/FX45
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-II.
Data Monitor Mode
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-II.[CODE- ERR] - FL
[CODE- ERR] - FR
[CODE- ERR] - RR
[CODE- ERR] - RLFunction code data from front-left transmitter is malfunctioning.
Function code data from front-right transmitter is malfunctioning.
Function code data from rear-right transmitter is malfunctioning.
Function code data from rear-left transmitter is malfunctioning.
[BATT - VOLT - LOW] - FL
[BATT - VOLT - LOW] - FR
[BATT - VOLT - LOW] - RR
[BATT - VOLT - LOW] - RLBattery voltage of front-left transmitter drops.
Battery voltage of front-right transmitter drops.
Battery voltage of rear-right transmitter drops.
Battery voltage of rear-left transmitter drops.
VHCL_SPEED_SIG_ERR Vehicle speed signal is error.Diagnostic item Diagnostic item is detected when ···
MONITOR CONDITION SPECIFICATION
VHCL SPEED SE 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.
ID REGST FL
ID REGST FR
ID REGST RR
ID REGST RL
Ignition switch ONRegistration ID: DONE
No registration ID: YET
WARNING LAMPWarning lamp on: ON
Warning lamp off: OFF
BUZZERBuzzer in Low tire pressure warning control unit on: ON
Buzzer in Low tire pressure warning control unit off: OFF

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TROUBLE DIAGNOSES
Revision: 2004 November 2004 FX35/FX45
Preliminary CheckAES000NZ
BASIC INSPECTION
1. CHECK ALL TIRES PRESSURES

Check all tires pressures.
OK or NG
OK >> GO TO 2.
NG >> Adjust tire pressure to specified value.
2. CHECK WARNING LAMP ACTIVATION
1. Check warning lamp activation.
2. Does warning lamp activate for 1 seconds when ignition switch is turned “ON”.
Does warning lamp active?
YES >> GO TO 3.
NO >> Check fuse and combination meter.
3. CHECK CONNECTOR
1. Disconnect low tire pressure warning control unit harness connectors M74 and R102.
2. Check terminals for damage or loose connection.
3. Reconnect harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK TRANSMITTER ACTIVATION TOOL

Check transmitter activation tool battery.
OK or NG
OK >> Carry out self-diagnosis.
NG >> Replace transmitter activation tool battery.Tire pressure
: 220 kPa (2.2 kg/cm
2 , 32 psi)

TROUBLE DIAGNOSES
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Revision: 2004 November 2004 FX35/FX45
Malfunction Code/Symptom ChartAES000O0
Code/Symptom Malfunction partReference
page
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18Front-left tire pressure drops to 190 kPa (1.9 kg/cm
2 , 27 psi) or less
Front-right tire pressure drops to 190 kPa (1.9 kg/cm2 , 27 psi) or less
Rear-right tire pressure drops to 190 kPa (1.9 kg/cm2 , 27 psi) or less
Rear-left tire pressure drops to 190 kPa (1.9 kg/cm2 , 27 psi) or less—
21
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24Transmitter no data (front - left)
Transmitter no data (front - right)
Transmitter no data (rear - right)
Transmitter no data (rear - left)WT-22
31
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34Transmitter checksum error (front - left)
Transmitter checksum error (front - right)
Transmitter checksum error (rear - right)
Transmitter checksum error (rear - left)WT-22
35
36
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38Transmitter pressure data error (front - left)
Transmitter pressure data error (front - right)
Transmitter pressure data error (rear - right)
Transmitter pressure data error (rear - left)WT-23
41
42
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44Transmitter function code error (front - left)
Transmitter function code error (front - right)
Transmitter function code error (rear - right)
Transmitter function code error (rear - left)WT-22
45
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47
48Transmitter battery voltage low (front - left)
Transmitter battery voltage low (front - right)
Transmitter battery voltage low (rear - right)
Transmitter battery voltage low (rear - left)WT-22
52 Vehicle speed signalWT-24
Warning lamp does not come on when
ignition switch is turned on.Fuse or unified meter and A/C amp.
Low tire pressure warning control unit connector or circuit
Low tire pressure warning control unit WT-25
Warning lamp stays on when ignition
switch is turned on.Fuse or unified meter and A/C amp.
Low tire pressure warning control unit connector or circuit
Low tire pressure warning control unitWT-26
Warning lamp blinks when ignition
switch is turned on.Low tire pressure warning control unit harness connector or circuit
Low tire pressure warning control unit
Transmitter's mode off
ID registration not yetWT-28
Hazard warning lamp blinks when igni-
tion switch is turned on.Low tire pressure warning control unit harness connector or circuit
Low tire pressure warning control unitWT-29
“TIRE PRESSURE” information in dis-
play does not exist.Fuse
Display control unit
Low tire pressure warning control unit WT-30
ID registration cannot be completed.Transmitter
Antenna harness connector or circuit
AntennaWT-30

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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: 2004 November 2004 FX35/FX45
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSPFP:00000
Inspection 1: Transmitter or Low Tire Pressure Warning Control UnitAES000O1
MALFUNCTION CODE NO. 21, 22, 23 OR 24
1. CHECK CONTROL UNIT

Drive for several minutes. Check all tires' pressure with CONSULT-II “DATA MONITOR ITEM”.
Are all tires' pressure displayed 0 kPa?
YES >> GO TO 2.
NO >> GO TO 3.
2. CHECK ANTENNA CONNECTOR

Check antenna and feeder connector R102 for damage or loose connections.
OK or NG
OK >> Replace control unit, GO TO 3.
NG >> Repair or replace antenna or feeder connector.
3. ID REGISTRATION

Carry out ID registration of all transmitters.
Is there a tire that cannot register ID?
YES >> Replace transmitter of the tire, then GO TO 5.
NO >> GO TO 4.
4. VEHICLE DRIVING

Drive at a speed of 40 km/h (25 MPH) or more for several minutes without stopping.
Check all tires' pressure with CONSULT-II “DATA MONITOR ITEM” within 15 minutes after vehicle speed
becomes 17 km/h (11 MPH).
Does
“DATA MONITOR ITEM” displayed tire pressure as normal without any warning lamp?
YES >> INSPECTION END.
NO >> GO TO 5.
5. ID REGISTRATION AND VEHICLE DRIVING
1. Carry out ID registration of all transmitters.
2. Drive at a speed of 40 km/h (25 MPH) or more for 3 minutes, and then drive the vehicle at any speed for
10 minutes. Then check all tires' pressure with CONSULT-II “DATA MONITOR ITEM” within 5 minutes.
Does
“DATA MONITOR ITEM” displayed tire pressure as normal without any warning lamp?
YES >> GO TO inspection applicable to DTC.
NO >> INSPECTION END.
Inspection 2: Transmitter - 1AES000O2
MALFUNCTION CODE NO. 31, 32, 33, 34, 41, 42, 43, 44, 45, 46, 47 OR 48
1. ID REGISTRATION (CORRECTION OF TRANSMITTER LOCATION)
1. Carry out ID registration of all transmitters.
2. Drive at a speed of 40 km/h (25 MPH) or more for 3 minutes, and then drive the vehicle at any speed for
10 minutes.
>> GO TO 2.