Warning Light Circuit: Description

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

The key warning indicator light, which is built into the combination meter, comes on or blinks as a warning to the driver.
The certification ECU sends key warning indicator light on / blink request signals to the combination meter via BEAN.

HINT:

If the key warning indicator light does not come on or blink properly, there may be a problem in the power source of the multiplex communication system and combination meter or in the certification ECU.