Toyota Sienna Service Manual: TC and CG Terminal Circuit
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).
1 CHECK HARNESS AND CONNECTOR (DLC3 - TIRE PRESSURE WARNING ECU)
(a) Disconnect the T15 ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance 
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See page TW-28)
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 ...
Tire pressure warning receiver (w/ antenna)
Components
...
Other materials:
Disassembly
1. REMOVE NO. 1 HEADLIGHT BULB (HALOGEN HEADLIGHT)
Turn in the direction indicated by the arrow and
remove the No. 1 headlight bulb.
2. REMOVE DISCHARGE HEADLIGHT BULB (DISCHARGE HEADLIGHT)
Turn in the direction indicated by the arrow and
disconnect the socket.
...
Inspection
1. INSPECT FRONT SEAT INNER BELT ASSEMBLY RH
Release the seat belt (Buckle switch is ON).
Check the resistance between the terminals.
Standard
If the result is not as specified, replace the inner belt
assembly.
Inspect the buckle switch.
Fasten ...
How to proceed with
troubleshooting
NOTICE:
DTCs for the CAN communication system are as follows:
U0073, U0100, U0122, U0123, U0124, U0126 and U1101.
HINT:
If U0235 or U1102 is output alone, the CAN communication is
normal
1 CHECK AND CLEAR DTCS
HINT:
CAN communication DTCs are output when there is an
open or short in any ...
