Toyota Sienna Service Manual: ECU Power Source Circuit
This is the power source for the tire pressure warning ECU.
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 INSPECT FUSE (ECU-IG)
(a) Remove the ECU-IG fuse from the instrument panel junction block.
(b) Measure the resistance of the fuse.
Standard resistance: Below 1 Ω
2 INSPECT IGNITION RELAY NO. 1
(a) Remove the IG1 relay from the instrument panel junction block.
(b) Measure the resistance according to the value(s) in the table below.
3 CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND)
(a) Disconnect the T15 ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
(c) Measure the resistance according to the value(s) in the table below.
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See page TW-28)
TC and CG Terminal CircuitDESCRIPTION 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 eac ...
Memory recall function
Each electronic key can be registered to recall your preferred driving position. Registering procedure Record your driving position to button “1” or “2” before performing the following: Carry only the key you want to register, and then close the driver’s door. If 2 or more keys ar ...
Locking the front doors from the outside without a key
Move the inside lock button to the lock position. Close the door. Vehicles without a smart key system The doors cannot be locked if either of the front doors is open and the key is in the engine switch. Vehicles with a smart key system The door cannot be locked if the engine switc ...
Caution: The vehicle is equipped with a supplemental restraint system (srs). It consists of a driver airbag, front passenger airbag, front seat side airbag, curtain shield airbag, and front seat belt pretensioner.