Some Toyota vehicles (2010 Highlander Hybrid V6 for example, but including 4Runner, Prius, Avalon, Camry, Corolla, Venza, Matrix, RAV4, Sienna and Tundra) equipped with RES (remote engine starter) may experience a non-functioning RES.
The system was available on certain models in 2006. The system was designed to operate at temperatures above -22 degrees Fahrenheit. Non-operation of the RES at lower ambient temperature is normal.
If it’s colder than 22 below, maybe the customer should just stay home.