Module I/O Signal
WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
For the specification (electrical component), refer to "Control Module I/O Signal" of "HEADLIGHT/FOGLIGHT (DIAGNOSTICS)". Ref. to HEADLIGHT/FOGLIGHT (DIAGNOSTICS)>CONTROL MODULE I/O SIGNAL