Measure the voltage between the body integrated unit connector terminal and chassis ground.
Connector & terminal
(B280) No. 6 (+) — Chassis ground (−):
(B281) No. 2 (+) — Chassis ground (−):
Is the voltage 10 V or more?
Replace the body integrated unit Register all ignition keys (transponders). Refer to the “PC application help for Subaru Select Monitor”.
Check the harness for open or short circuit between body integrated unit and fuse.