2007 TOYOTA SIENNA wiring

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–63
TW
DESCRIPTION
The signals are transmitted to the tire pressure warning antenna and receiver on the body as radio waves
and then sent to the tire pressure warning ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
• When replacing the tire pressure warning ECU, read the IDs stored in the ECU using the
intelligent tester and write them down before removal.
• It is necessary to perform initialization (See page TW-23) after registration (See page TW-20) of
the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.
DTC C2176/76 Receiver Error
DTC No. DTC Detection Condition Trouble Area
C2176/76DTC is stored when any of the following is detected:
• Malfunction in the tire pressure warning ECU internal
circuit.
• Terminal RF5V is shorted to ground.
• Malfunction in the tire pressure warning antenna and
receiver internal circuit.• Tire pressure warning antenna and receiver
• Wire harness or connector
• Tire pressure warning ECU
C148709E08

TW–66TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
DESCRIPTION
Initialization is necessary after replacing any of the ECUs, tires with different tire pressure, or tire pressure
warning valve and transmitter, after rotating the tires or when a new vehicle is delivered.
WIRING DIAGRAM
DTC C2177/77 Initialization not Completed
DTC No. DTC Detection Condition Trouble Area
C2177/77Initialization is not completed after vehicle speed of 5
mph (8 km/h) or more continues for 20 minutes or more
(total).• Tire pressure warning valve and transmitter
• Tire pressure warning ECU
• Tire pressure warning antenna and receiver
• Wire harness or connector
B166325E03

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–73
TW
DESCRIPTION
The tire pressure warning ECU receives a speed signal from the combination meter. This DTC is stored
upon entering test mode, and cleared when a vehicle speed signal of 12 mph (20 km/h) is detected for 3
seconds or more. This DTC is output only in test mode.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
• When replacing the tire pressure warning ECU, read the IDs stored in the ECU using the
intelligent tester and write them down before removal.
• It is necessary to perform initialization (See page TW-23) after registration (See page TW-20) of
the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.
(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 the item below in the Data List, and read the value
displayed on the intelligent tester.
DTC C2191/91 Vehicle Speed Signal Error (Test Mode DTC)
DTC No. DTC Detecting Condition Trouble Area
C2191/91 Speed sensor circuit malfunction• Vehicle speed sensor
• Tire pressure warning ECU
• Combination meter
• Wire harness or connector
1READ VALUE ON INTELLIGENT TESTER
E115290E65

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–75
TW
DESCRIPTION
The ECU enters the initialization mode and performs initialization automatically, when the tire pressure
warning ECU receives the signal from the tire pressure warning reset switch. If the ECU receives the
signal, the tire pressure warning light blinks 3 times (1 second on, 1 second off).
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Perform the tire pressure warning reset switch test in
TEST MODE PROCEDURE (See page TW-25).
OK:
Reset switch ON:
Tire pressure warning light comes on.
Reset switch OFF:
Tire pressure warning light blinks.
NG
OK
Tire Pressure Warning Reset Switch Circuit
1CHECK TIRE PRESSURE WARNING RESET SWITCH FUNCTION
C148712E07
Go to step 2
END

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–77
TW
DESCRIPTION
If the ECU detects trouble, the tire pressure warning light blinks (comes on after blinking for 1 minute) and
tire pressure monitor is cancelled at the same time. At this time, the ECU records a DTC in the memory.
Connect terminals TC and CG of DLC3 to make the tire pressure warning light blink and output the DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU
using the intelligent tester and write them down before removal.
It is necessary to perform initialization (See page TW-23) after registration (See page TW-20) of the
transmitter IDs into the tire pressure warning ECU, after the ECU has been replaced.
HINT:
This procedure must be performed according to the PROBLEM SYMPTOMS TABLE.
Tire Pressure Warning Light Circuit
E115290E66

TW–80TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
DESCRIPTION
This is the power source for the tire pressure warning ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU
using the intelligent tester and write them down before removal.
It is necessary to register an ID code after replacing the tire pressure warning valve and
transmitter and/or the tire pressure warning ECU (See page TW-20).
(a) Remove the ECU-IG fuse from the instrument panel
junction block.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1
NG
ECU Power Source Circuit
1INSPECT FUSE (ECU-IG)
C162809E01
REPLACE FUSE

TW–82TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
DESCRIPTION
DTC output mode is set by connecting terminals 13 (TC) and 4 (CG) of the DLC3. The DTCs are indicated
by blinks of the tire pressure warning light.
WIRING DIAGRAM
HINT:
When each warning light blinks continuously, a ground short in the wiring of terminal TC of the DLC3 or an
internal ground short in an ECU connected to this circuit may have occurred.
INSPECTION PROCEDURE
NOTICE:
When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU
using the intelligent tester and write them down before removal.
It is necessary to register an ID code after replacing the tire pressure warning valve and
transmitter and/or the tire pressure warning ECU (See page TW-20).
TC and CG Terminal Circuit
E110507E38

TW–32TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
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