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:
Reassembly
1. INSTALL UNDERDRIVE PLANETARY RING GEAR
HINT:
Use a torque wrench with a fulcrum length of 160
mm (6.3 in.).
(a) Install a new snap ring to the outer race of the radial
ball bearing rear.
HINT:
When replacing the bearing, also replace the
counter driven gear with a new one.
(b) Us ...
Stowing the third seats (power seats)
You can operate the power third seats when the shift lever is in P.
Before stowing or returning third seat, remove any items from the floor
area to prevent interference with moving parts.
Before stowing the third seats
Lower the center head
restraint to the lowest position and stow th ...
Diagnostic trouble code chart
HINT:
The parameters listed in the chart may not confirm exactly to
those read during the DTC check due to the type of
instrument or other factors.
If a trouble code is displayed during the DTC check in the
check mode, check the circuit for the code listed in the table
below. For details of ...
