DRL Relay Circuit: Description
WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
The daytime running light relay is built into the turn signal flasher.
When the daytime running light relay receives the ignition switch ON signal from the main body ECU, the turn signal flasher illuminates the turn signal light. When the daytime running light relay receives the headlight dimmer switch signal, the turn signal flasher turns off the turn signal light.