Daytime Running Light Relay Circuit [09/2014 - 10/2015]: Description
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Lexus RC 350, 2018 Lexus RC 300, 2017 Lexus RC 350, 2017 Lexus RC 300, and 2017 Lexus RC 200t. However, it is still accessible from the selected car via links, so may be relevant.
The illumination of the daytime running lights and parking lights is controlled by the headlight light control ECU sub-assembly LH and RH.