DTC B1820: Short in Side Squib (RH) Circuit; DTC B1821: Open in Side Squib (RH) Circuit; DTC B1822: Short in Side Squib (RH) Circuit (to Ground); DTC B1823: Short in Side Squib (RH) Circuit (to +B) [11/2018 - 02/2019]: Wiring Diagram
WARNING: This page is about a different car, the 2020 Toyota RAV4 and 2019 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.