Circuit description
WARNING: This page is about a different car, the 2014 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.
With the electrical key transmitter sub-assembly in the vehicle interior, press the engine switch. The collation ECM (smart key ECM ASSY) receives the signal and the power mode changes. If the power mode does not change to ACC ON but does change to IG ON, use these troubleshooting procedures.
NOTE:
If you remove and then reconnect the battery cable, the power returns to the mode it was before you removed the cable.