A-TRAC Indicator Light Remains ON: Description

WARNING: This page is about a different car, the 2008 Toyota FJ Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

This is the A-TRAC main switch circuit. When the A-TRAC switch is pushed on, the A-TRAC function is available and the A-TRAC indicator light illuminates.

HINT:

The A-TRAC does not operate even if the A-TRAC switch is pressed under the following conditions:

TRAC or VSC system is faulty.
Temperature inside the hydraulic brake booster increases and the A-TRAC operation is suspended.