Subaru BRZ 2018 Owner's Manual page 179

When stopping the engine with the select lever in a position
other than P (vehicles with an automatic transmission)
If the engine is stopped with the select lever in a position other than P,
the push-button ignition switch will not be turned off but instead be
turned to "ACC" mode. Perform the following procedure to turn the
switch off:
Check that the parking brake is set.
STEP 1
Shift the select lever to P.
STEP 2
Check that the keyless access with push button start system
STEP 3
indicator light (green) flashes slowly and then press the push-
button ignition switch once.
Check that the keyless access with push button start system
STEP 4
indicator light (green) is off.
■
Auto power off function
Vehicles with an automatic transmission
If the vehicle is left in "ACC" mode for more than 20 minutes or "ON" mode
(the engine is not running) for more than an hour with the select lever in P,
the push-button ignition switch will automatically turn off. However, this func-
tion cannot entirely prevent battery discharge. Do not leave the vehicle with
the push-button ignition switch in "ACC" or "ON" mode for long periods of
time when the engine is not running.
Vehicles with a manual transmission
If the vehicle is left in "ACC" mode for more than 20 minutes or "ON" mode
(the engine is not running) for more than an hour, the push-button ignition
switch will automatically turn off. However, this function cannot entirely pre-
vent battery discharge. Do not leave the vehicle with the push-button ignition
switch in "ACC" or "ON" mode for long periods of time when the engine is not
running.
2-1. Driving procedures
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