warning light TOYOTA SIENNA 2007 Service Owner's Manual

TIRE AND WHEEL – TIRE AND WHEEL SYSTEMTW–5
TW
REPAIR
1. INTRODUCTION
(a) This section introduces ways to determine whether
the run-flat tire is repairable or not. Repair must be
performed by following the appropriate procedures.
If a flat tire occurs, it is possible to drive a maximum
of 160 km (100 miles) at a speed below 90 km/h (55
mph) due to the reinforced sidewalls. However, if
the customer continues to drive with low tire
pressure (less than about 100 kPa (1.0 kgf/cm
2,
14.5 psi) and tire pressure warning light is on), the
inside of the sidewall will gradually deteriorate and
the run-flat performance may be reduced.
Therefore, the tires may require replacement.
However, there are some cases where it is possible
to repair a run-flat tire using the same repair method
as for normal tires. Use the following flowchart to
determine if a run-flat tire is repairable.
NOTICE:
When performing repairs, follow the Rubber
Manufacturers Association (RMA) repair
procedures.
2. REPAIR PROCEDURE (CUSTOMER INTERVIEW)
(a) The tire pressure warning system can help
determine the history of the tire's use. The driving
conditions the tire was subjected to while the tire
pressure warning light was on should be obtained
from the customer. Also, make sure to ask the
following questions.
(1) Was the vehicle driven at a speed over 90 km/h
(55 mph) with the tire pressure warning light
on?
(2) Was the vehicle driven over 160 km (100 miles)
with the tire pressure warning light on?
A "Yes" response to either of the above will
greatly reduce the chance of tire repairability.
3. TECHNICIAN TIRE INSPECTION
(a) After the customer interview, it is necessary to
conduct a thorough inspection of the tire after it has
been removed from the wheel. As it is difficult to
identify a tire with low pressure visually, check the
pressure of each tire to determine the tire(s) causing
the low-pressure warning. If the tire is found to be
repairable, follow the RMA repair procedures.
NOTICE:
The deflated tire may be extremely hot, which
may cause injury, so allow the tire to cool prior
to handling.

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–19
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HOW TO PROCEED WITH
TROUBLESHOOTING
HINT:
• Use the following procedures to troubleshoot the tire
pressure warning system.
• *: Use the intelligent tester.
NEXT
(a) Interview the customer to confirm the trouble.
HINT:
It is important to collect as much specific information as
possible from the customer to allow for a quick repair.
NEXT
(a) Adjust all tire pressures to the standard values.
Result
A
B
(a) Check for DTCs (See page TW-34).
Result
B
A
(a) Refer to DIAGNOSTIC TROUBLE CODE CHART (See
page TW-37).
1VEHICLE BROUGHT TO WORKSHOP
2CUSTOMER PROBLEM ANALYSIS
3ADJUST TIRE PRESSURE
Condition Proceed to
Tire pressure warning light goes off A
Tire pressure warning light remains on B
Go to step 9
4CHECK FOR DTC*
Result Proceed to
DTC is output A
DTC is not output B
Go to step 6
5DTC CHART

TW–26TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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2. INITIALIZATION PROCEDURE
(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) Select "TIREPRESS" by following the prompts
displayed on the intelligent tester.
(e) Press the tire pressure warning reset switch within
30 seconds after turning the ignition switch ON.
Keep the tire pressure warning reset switch pressed
for 3 seconds or more with the ignition switch ON.
(f) Check that the tire pressure warning light blinks 3
times (1 second ON, 1 second OFF).
HINT:
Initialization will be completed if signals are received
from all the wheels.
(g) Wait for 5 to 6 minutes with the ignition switch ON.
NOTICE:
• The initialization is normally completed
within 5 to 6 minutes.
• If the initialization has not been completed
successfully, DTC C2177/77 is set after the
vehicle is driven for 20 minutes or more.
• The initialization can be terminated by
connecting terminals TC and CG of the DLC3
connector.
3. CHECK THAT INITIALIZATION HAS BEEN
COMPLETED
(a) Confirm that the data of tire pressure of all tires are
displayed on the intelligent tester screen.
TIRE PRESSURE:
C159182E02
F100115E55
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
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.*
TIREPRESS2ID2 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.*

TW–10TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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TIRE PRESSURE WARNING
SYSTEM
PRECAUTION
1. TIRE PRESSURE WARNING SYSTEM PRECAUTION
(a) When the tire pressure warning light comes on,
immediately check the tire pressure of the tire and
adjust it to the specified value. (The tire pressure
warning light will come on after blinking for 1 minute
if there is an open in the tire pressure warning light
circuit.)
Cold tire inflation pressure
(b) When the tire pressure warning light comes on after
blinking for 1 minute, there is a malfunction in the
system. Check for DTCs.
(c) It is necessary to register the transmitter ID in the
tire pressure warning ECU after replacing the tire
pressure warning valve and transmitter and/or tire
pressure warning ECU (See page TW-20).
(d) When replacing the tire pressure warning ECU:
(1) Using the DATA LIST, read the transmitter IDs
registered in the ECU and make a note of them
before removing the tire pressure warning ECU.
(2) Register the transmitter IDs after installing a new
tire pressure warning ECU.
C159176E01
Tire Size
kPa (kgf/cm2, psi)
215/65R16
240 (2.4, 35)
225/60R17

TW–12TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
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2. IN CASE OF TIRE AND WHEEL REPLACEMENT
(a) When tires and wheels are replaced, always ensure
that each transmitter ID is correctly registered.
3. IN CASE OF REPLACEMENT OF TIRE PRESSURE
WARNING ECU, TIRE PRESSURE WARNING VALVE
AND TRANSMITTER, OR TIRE(S) WITH DIFFERENT
TIRE PRESSURE
(a) Initialize the tire pressure warning system after any
of the following is performed:
• Replacing the tire pressure warning ECU or the
tire pressure warning valve and transmitter.
• Installing tire(s) which require different tire
pressure.
• Changing the tire inflation pressure by changing
traveling speed or load weight, etc.
HINT:
The tire pressure warning system will not operate
properly if it is not initialized (See page TW-23).
4. FAIL-SAFE FUNCTION
(a) When a system malfunction occurs in the tire
pressure warning system, the tire pressure warning
light comes on after blinking for 1 minute and
informs the driver of the system failure.
(b) The result of this diagnosis is stored in the tire
pressure warning ECU.
5. CHECK TIRE PRESSURE AFTER REPAIRS
(a) After repairs, confirm that the actual tire pressures
are displayed in DATA LIST (See page TW-35).

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