Check Security Indicator Light Circuit
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 inspection of the security indicator light circuit, refer to "Warning Light Illumination Pattern" of "KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)". Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>WARNING LIGHT ILLUMINATION PATTERN