TRAC OFF Indicator Light Remains ON [08/2013 - ]: Description
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
The skid control ECU (brake booster with master cylinder assembly) is connected to the combination meter assembly via CAN communication.
Pressing the VSC OFF switch (integration control and panel assembly) turns off TR(A)C control and pressing and holding this switch turns off TR(A)C and VSC controls. If TR(A)C control is turned off, the TR(A)C OFF message is displayed on the multi-information display in the combination meter assembly.