warning TOYOTA SIENNA 2007 Service Service Manual

TW–24TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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• If normal pressure values are displayed, the
IDs have been registered correctly.
• If the tire pressure values are not displayed
after several minutes, the IDs may be
incorrect or the system may have a
malfunction.

TW–28TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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TEST MODE PROCEDURE
1. ENTER TEST MODE
HINT:
• Operation of the tire pressure warning reset switch
can be checked in TEST MODE.
• During TEST MODE, the system is not initialized by
pushing the tire pressure warning reset switch. The
circuit of the tire pressure warning reset switch can be
inspected during this mode.
(a) Make sure that the ignition switch is off.
(b) Connect the intelligent tester to DLC3.
(c) Turn the ignition switch to the ON position.
(d) Check that the tire pressure warning light comes on
for 3 seconds and then goes off.
(e) Select the TEST MODE on the intelligent tester.
(f) Confirm that the tire pressure warning light in the
combination meter blinks at 0.125-second intervals.
2. PERFORM SIGNAL CHECK
HINT:
• When entering signal check mode, the tire pressure
warning ECU sets all the signal check DTCs first.
After completing signal check for each inspection
item, the DTCs for systems that are determined to be
normal by the tire pressure warning ECU will be
erased.
The DTCs for other inspection items may not be
erased when only a certain signal is inspected.
• When signal check returns to normal mode, all the
signal check DTCs will be erased.
(a) Make sure that the ignition switch is off.
(b) Connect the intelligent tester to DLC3.
(c) Turn the ignition switch to the ON position.
C122887
F100632E04

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–29
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(d) Select the SIGNAL CHECK on the intelligent tester.
HINT:
Every time the test mode DTC clear conditions are
satisfied, the tire pressure warning light comes on
for 1 second. Then, the tire pressure warning light
blinks at 0.125-second intervals.
(e) Drive the vehicle at 12 mph (20 km/h) or more for 10
seconds or more to check the vehicle speed signal
(C2191/91).
(f) Loosen the valve core and rapidly reduce the
pressure (at least 40 kPa (0.41 kg/cm
2, 5.8 psi)
within 30 seconds or more) to check the transmitter
data (C2181/81 to C2184/84).
HINT:
The transmitter ID can be transmitted by rapidly
reducing the tire pressure.
(g) Check that the tire pressure warning system test
mode DTCs are erased.
(h) Check the tire pressure warning reset switch.
(1) Press the tire pressure warning reset switch.
C110644
Test Mode DTC Test Signal Test Mode DTC Clear Condition
C2181/81 to C2184/84 Transmitter DataData is received from the transmitter which has a registered ID in
the tire pressure warning ECU
C2191/91 Vehicle Speed SignalVehicle speed of 12 mph (20 km/h) or more is detected for 3
seconds or more

TW–30TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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(2) Check the tire pressure warning indicator light.
(i) Result
HINT:
After the signal check is completed, check for a
signal check DTC to confirm the system status.
(j) End of SIGNAL CHECK
After completing the test mode (SIGNAL CHECK),
turn the ignition switch off and disconnect the tester.
DTC of SIGNAL CHECK (TEST DIAGNOSIS)
function:
If a trouble code is displayed during the test mode
DTC check, check the circuit listed for that code. For
details of each code, refer to the relevant page listed
under respective "DTC No." in the chart.
Test Signal Normal Condition
Tire Pressure Warning Reset Switch• Switch ON: TPWS indicator comes on
• Switch OFF: TPWS indicator blinks at 0.125
Condition Procedure
SIGNAL CHECK DTC is output Repair the faulty part and enter SIGNAL CHECK again
SIGNAL CHECK DTCs are cleared No problem
DTC No. Detection Item Trouble Area See procedure
C2181/81 Transmitter ID1 not received• Tire pressure warning valve and transmitter
• Tire pressure warning antenna and receiver
• Wire harness or connector
• Tire pressure warning ECUTW-42
C2182/82 Transmitter ID2 not received• Tire pressure warning valve and transmitter
• Tire pressure warning antenna and receiver
• Wire harness or connector
• Tire pressure warning ECUTW-42
C2183/83 Transmitter ID3 not received• Tire pressure warning valve and transmitter
• Tire pressure warning antenna and receiver
• Wire harness or connector
• Tire pressure warning ECUTW-42
C2184/84 Transmitter ID4 not received• Tire pressure warning valve and transmitter
• Tire pressure warning antenna and receiver
• Wire harness or connector
• Tire pressure warning ECUTW-42
C2191/91 Vehicle speed signal error• Vehicle speed sensor
• Combination meter assembly
• Wire harness or connector
• Tire pressure warning ECUTW-70

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–31
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PROBLEM SYMPTOMS TABLE
HINT:
• Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms
are listed in order of probability in the "Suspected Area"
column of the table. Check each symptom by checking the
suspected areas in the order they are listed. Replace parts
as necessary.
• Inspect the fuses and relays related to this system before
inspecting the suspected areas below.
TIRE PRESSURE WARNING SYSTEM:
Symptom Suspected Area See page
Tire pressure warning light does not illuminate, despite
tire pressure decreasingInitializationTW-23
Check DATA LIST (Tire inflation pressure)TW-35
ID code check (Registration)TW-20
Tire pressure warning light illuminated (Goes off during
initial check)ECU power source circuitTW-77
Tire pressure warning light circuitTW-74
Tire pressure warning light illuminated (Comes on
during initial check)Check DATA LIST (Tire inflation pressure)TW-35
Tire pressure warning light circuitTW-74
ID code check (Registration)TW-20
Initialization cannot be done Tire pressure reset switch circuitTW-72
DTC check cannot be doneECU power source circuitTW-77
TC and CG terminal circuitTW-79

TW–32TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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TERMINALS OF ECU
1. CHECK TIRE PRESSURE WARNING ECU
HINT:
Inspect the connectors from the back side while the
connectors are connected.
(a) Disconnect the tire pressure warning antenna and
receiver connector.
(b) Measure the voltage according to the value(s) in the
table below.
(c) Connect the tire pressure warning antenna and
receiver connector.
(d) Measure the voltage and resistance according to
the value(s) in the table below. If the result is not as
specified, the ECU may have a malfunction.
E129452E15
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
T15-1 (CLSW) - T15-9 (GND) L-O - W-BTire pressure warning
reset switch• Ignition switch ON
• Tire pressure warning
reset switch on8.5 to 15 V
T15-1 (CLSW) - T15-9 (GND) L-O - W-BTire pressure warning
reset switch• Ignition switch ON
• Tire pressure warning
reset switch OFFBelow 1.5 V
T15-2 (SPD) - T15-9 (GND) V-W - W-B Vehicle speed signal Vehicle is running Pulse generation
T15-5 (IND) - T15-9 (GND) GR-L - W-BTire pressure warning light
output signal• Ignition switch ON
• Tire pressure warning
light offBelow 0.5 V
T15-5 (IND) - T15-9 (GND) GR-L - W-BTire pressure warning
reset switchAfter ignition switch is
turned ON, tire pressure
warning light illuminates
for 3 seconds.2.2 to 4.4 V
T15-6 (RF5V) - T15-9 (GND) P-L - W-BTire pressure warning
antenna and receiver
power sourceIgnition switch ON 11 to 14 V
T15-7 (IG) - T15-9 (GND) B-R - W-B IG power source Ignition switch ON 11 to 14 V
T15-10 (SIL) - T15-9 (GND) W - W-B Diagnostic communication Ignition switch ON 8 to 14 V
T15-11 (GND2) - T15-9 (GND) P - W-BTire pressure warning
antenna and receiver
groundAlways Below 1
T15-12 (RDA) - T15-9 (GND) G-B - W-BTire pressure warning
antenna and receiver
signalIgnition switch ON 11 to 14 V

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–33
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(e) Using an oscilloscope, check the waveform 1.
(1) Waveform 1 (Reference)
(2) Waveform 2 (Reference)
F047507E08
Item Contents
Terminal SPD - GND
Tool setting 5 V/DIV, 200 ms./DIV.
Vehicle condition While driving at approximately 12 mph (20 km/h)
C107353E04
Item Contents
Terminal SIL - Body ground
Tool setting 5 V/DIV., 1 ms./DIV.
Vehicle condition Communicating using intelligent tester

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–37
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DTC CHECK / CLEAR
1. DTC CHECK (USING SST CHECK WIRE)
(a) Check DTCs.
(1) Turn the ignition switch off.
(2) Using SST, connect terminals TC and CG of
DLC3.
SST 09843-18040
(3) Turn the ignition switch to the ON position.
(4) Read and record any DTCs from the tire
pressure warning light on the combination meter.
Refer to the illustration as examples of a normal
system code and codes 13 and 33.
HINT:
• If the tire pressure warning light does not
indicate any DTCs or the normal system
code, inspect the tire pressure warning light
circuit or TC and CG terminal circuit.
• If 2 or more malfunctions are indicated at the
same time, the lowest numbered DTC is
displayed first.
(5) Refer to the Diagnostic Trouble Code Chart (See
page TW-37) for DTC information.
(6) After completing the check, turn the ignition
switch off and remove SST from DLC3.
SST 09843-18040
2. DTC CHECK (USING INTELLIGENT TESTER)
(a) Check DTCs.
(1) Make sure that the ignition switch is off.
(2) Connect the intelligent tester to the DLC3.
(3) Turn the ignition switch to the ON position.
(4) Read the DTCs following the prompts on the
tester screen.
HINT:
Refer to the intelligent tester operator's manual
for further details.
(b) Clear the DTCs.
HINT:
After repairing the malfunctions, clear the DTCs.
(1) Make sure that the ignition switch is off.
(2) Connect the intelligent tester to DLC3.
(3) Turn the ignition switch to the ON position.
(4) Clear the DTCs following the prompts on the
tester screen.
HINT:
Refer to the intelligent tester operator's manual
for further details.
C159183E02
Trouble Area See page
Tire pressure warning light circuitTW-74
TC and CG terminal circuitTW-79

TW–38TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the intelligent tester to read the DATA LIST allows
the values or states of switches, sensor, actuators and
other items to be read without removing any parts. This
non-intrusive inspection can be very useful because
intermittent conditions or signals may be discovered
before parts or wiring is disturbed. Reading the DATA
LIST information early in troubleshooting is one way to
save diagnostic time.
NOTICE:
In the table below, the values listed under "Normal
Condition" are reference values. Do not depend
solely on these reference values when deciding
whether a part is faulty or not.
(a) Make sure that the ignition switch is off.
(b) Connect the intelligent tester to DLC3.
(c) Turn the ignition switch to the ON position.
(d) Following the display on the intelligent tester, read
"DATA LIST".
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
MODE STATUSTire pressure warning system mode/NORMAL
or REG 2nd or REG M or TESTNORMAL: Normal mode
TEST: Test mode-
MAIN TIRENumber of main tire ID to be registered/0, 1, 2,
3, 40 to 4 should be displayed -
VEHICLE SPDVehicle speed reading/min.: 0 km/h (0 mph),
max.: 255 km/h (158 mph)Actual vehicle speedSpeed indicated on the
combination meter
REGIT ID1 CODE
Registered ID1 code/min.: 0, max.: FFFFFFF
*1The ID No. registered in the
transmitter ID1 is displayed-
REGIT ID2 CODE
Registered ID2 code/min.: 0, max.: FFFFFFF
*1The ID No. registered in the
transmitter ID2 is displayed-
REGIT ID3 CODE
Registered ID3 code/min.: 0, max.: FFFFFFF
*1The ID No. registered in the
transmitter ID3 is displayed-
REGIT ID4 CODE
Registered ID4 code/min.: 0, max.: FFFFFFF
*1The ID No. registered in the
transmitter ID4 is displayed-
TRANS STATUS ID code transmission status/FINISH or NOW FINISH or NOW -
INITIAL SW Tire pressure warning reset switch/ON, OFFON: Switch on
OFF: Switch off-
TIREPRESS1ID1 tire inflation pressure (Absolute pressure) /
min.: 100 kPa (1 kgf/cm
2, 14 psi)
max.: 449.35 kPa (4.5 kgf/cm2, 63 psi)Actual tire inflation pressureIf 100 kPa (1 kgf/cm
2, 14 psi)
for absolute pressure is
displayed, the data has not
been received.
*2
TIREPRESS2ID2 tire inflation pressure (Absolute pressure) /
min.: 100 kPa (1 kgf/cm2, 14 psi)
max.: 449.35 kPa (4.5 kgf/cm2, 63 psi)Actual tire inflation pressureIf 100 kPa (1 kgf/cm
2, 14 psi)
for absolute pressure is
displayed, the data has not
been received.
*2
TIREPRESS3ID3 tire inflation pressure (Absolute pressure) /
min.: 100 kPa (1 kgf/cm2, 14 psi)
max.: 449.35 kPa (4.5 kgf/cm2, 63 psi)Actual tire inflation pressureIf 100 kPa (1 kgf/cm
2, 14 psi)
for absolute pressure is
displayed, the data has not
been received.
*2
TIREPRESS4ID4 tire inflation pressure (Absolute pressure) /
min.: 100 kPa (1 kgf/cm2, 14 psi)
max.: 449.35 kPa (4.5 kgf/cm2, 63 psi)Actual tire inflation pressureIf 100 kPa (1 kgf/cm
2, 14 psi)
for absolute pressure is
displayed, the data has not
been received.
*2

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–39
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HINT:
*1: Displayed only when the ID No. is not registered.
*2: It may take about 5 to 6 minutes until the values
are displayed. If the values are not displayed after a
few minutes, perform troubleshooting according to
the inspection procedure for DTCs C2121/21 to
C2124/24 (See page TW-42).
METER:
2. ACTIVE TEST
Using the intelligent tester to perform ACTIVE TEST
allows the meters, indicators and other items to be
operated without removing any parts. Performing
ACTIVE TEST early in troubleshooting is one way to
save diagnostic time. It is possible to display the DATA
LIST on the intelligent tester during ACTIVE TEST.
(a) Make sure that the ignition switch is off.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Enter the following menus: DIAGNOSIS / OBD/
MOBD / METER / ACTIVE TEST.
METER:
TIRE TEMP1ID1 temperature in tire/min.: -50C (-58F),
max.: 205
C (401F)Actual tire temperatureIf -50
C (-58F) is displayed,
data has not been received.
TIRE TEMP2ID2 temperature in tire/min.: -50
C (-58F),
max.: 205
C (401F)Actual tire temperatureIf -50
C (-58F) is displayed,
data has not been received.
TIRE TEMP3ID3 temperature in tire/min.: -50
C (-58F),
max.: 205
C (401F)Actual tire temperatureIf -50
C (-58F) is displayed,
data has not been received.
TIRE TEMP4ID4 temperature in tire/min.: -50
C (-58F),
max.: 205
C (401F)Actual tire temperatureIf -50
C (-58F) is displayed,
data has not been received.
BATT VOLT1 ID1 battery voltage/OVER or LESS OVER -
BATT VOLT2 ID2 battery voltage/OVER or LESS OVER -
BATT VOLT3 ID3 battery voltage/OVER or LESS OVER -
BATT VOLT4 ID4 battery voltage/OVER or LESS OVER -
INITIAL SW INFOTire pressure warning reset switch setting
information/WITH or WITHOUTWITH or WITHOUT -
INIT THRESHOLD1ID1 initial threshold of low-pressure/min.: 0 kPa
(0 kgf/cm
2, 0 psi), max.: 637.5 kPa (6.4 kgf/cm2,
93 psi)Tire pressure after initialization -
INIT THRESHOLD2ID2 initial threshold of low-pressure/min.: 0 kPa
(0 kgf/cm
2, 0 psi), max.: 637.5 kPa (6.4 kgf/cm2,
93 psi)Tire pressure after initialization -
INIT THRESHOLD3ID3 initial threshold of low-pressure/min.: 0 kPa
(0 kgf/cm
2, 0 psi), max.: 637.5 kPa (6.4 kgf/cm2,
93 psi)Tire pressure after initialization -
INIT THRESHOLD4ID4 initial threshold of low-pressure/min.: 0 kPa
(0 kgf/cm
2, 0 psi), max.: 637.5 kPa (6.4 kgf/cm2,
93 psi)Tire pressure after initialization -
# CODES Number of DTCs recorded/min.: 0, max.: 255 Min.: 0, Max.: - - Tester Display Measurement Item/Range Normal Condition Diagnostic Note
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
SPEED METERVehicle speed/Min.: 0 km/h (0 mph), Max.: 255
km/h (158 mph)Almost same as actual vehicle speed
(When driving)-
Tester Display Test Part Control Range Diagnostic Note
TIRE PRESS WARN Tire Pressure Warning LightTire Pressure Warning Light is
OFF/ONConfirm that the vehicle is
stopped with the engine idling