Toyota Sienna Service Manual: Problem symptoms table

Customize parameters

1. Seat Belt Buzzer ON/OFF Setting The seat belt buzzer ON/OFF setting, which is a setting of the buzzer function of the combination meter, can disable the driver side seat belt buzzer and front p ...

Terminals of ECU

1. COMBINATION METER ASSEMBLY *1: with Power Rear No. 2 Seat with Stowing Function *2: with Theft Deterrent System  Waveform 1 (Reference) : Using an oscilloscope: OK ...

Other materials:

Indicators
The indicators inform the driver of the operating state of the vehicle’s various systems. *1: If equipped *2: These lights turn on when the engine switch is turned to the “ON” position (vehicles without a smart key system) or IGNITION ON mode (vehicles with a smart key system) to ...

Pre-collision seat belts (front seats of vehicles with pre-collision system)
If the system determines that a collision is unavoidable, the front seat belts will retract before the collision. Emergency locking retractor (ELR) The retractor will lock the belt during a sudden stop or on impact. It may also lock if you lean forward too quickly. A slow, easy motion wi ...

Meter Illumination is Always Dark
DESCRIPTION  Confirm that the vehicle is equipped with the optitron meter, then check this circuit. The combination meter assembly receives a auto dimmer signal from the body ECU by the multiplex communication line. WIRING DIAGRAM INSPECTION PROCEDURE 1 CHECK MULTIPLEX CO ...