Toyota Sienna Service Manual: Tire Pressure Warning Light Circuit
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.
1 CHECK HARNESS AND CONNECTOR (COMBINATION METER - TIRE PRESSURE WARNING ECU)
(a) Disconnect the C10 combination meter connector.
(b) Disconnect the T15 tire pressure warning ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance 
2 INSPECT COMBINATION METER
(a) Disconnect the connector from the tire pressure warning ECU.
(b) Turn the ignition switch to the ON position, and check if the tire pressure warning light illuminates.
Result 
REPLACE TIRE PRESSURE WARNING ECU (See page TW-87)
Tire Pressure Warning Reset Switch Circuit
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 ...
ECU Power Source Circuit
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
st ...
Other materials:
Precaution
1. PRECAUTION FOR VEHICLE WITH SRS AIRBAG
AND SEAT BELT PRETENSIONER
Some operations in this section may affect SRS
airbag system. Before performing the corresponding
operations, please read the NOTICE of the SRS
airbag for the proper operations.
COMPONENTS
...
Inspection
1. INSPECT TIRES
(a) Check the tires for wear and proper inflation
pressure.
Cold tire inflation pressure
(b) Using a dial indicator, check the runout of the tires.
Tire runout:
1.4 mm (0.055 in.) or less
2. ROTATE TIRES
HINT:
Rotate the tires as shown in the illustration.
3. INSP ...
Inspection
1. Inspect starter assembly
NOTICE:
These tests must be performed within 3 to 5 seconds
to avoid burning out the coil.
(a) Perform the pull-in test.
(1) Disconnect the lead wire from terminal C.
(2) Connect the battery to the magnetic switch as
shown in the illustratio ...
