Accessory Meter does not Illuminate [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.
This circuit provides power to the accessory meter assembly.
The accessory meter illumination level can be adjusted by pressing the brightness switch in the radio receiver assembly.
HINT:
The radio receiver assembly should be replaced if any of the switches are malfunctioning.