W/ Daytime Running Light: Headlight And Taillight System
WARNING: This page is about a different car, the 2003 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
This system uses the multiplex communication system, so check diagnosis system of the multiplex communication system before you proceed with troubleshooting.
Fig 1: Problem Symptoms Chart - Headlight And Taillight System (With Daytime Running Light)