Subaru WRX 2015 Owner's Manual page 372

1) Starting forward facing uphill
2) Starting backward facing downhill
A) Brake pedal (both MT models and CVT
models)
B) Clutch pedal (MT models only)
In both these cases, the Hill start assist
system operates under the following con-
ditions.
. when the clutch pedal is depressed
while the brake pedal is also depressed
(MT models)
. when the vehicle has stopped with the
brake pedal depressed (CVT models)
Braking power is maintained temporarily
(for approximately 2 seconds) by the Hill
start assist system after the brake pedal is
released. The driver is therefore able to
start the vehicle in the same way as on a
level grade, just using the clutch pedal
(MT models only) and accelerator pedal
(all models).
If the braking power of the Hill start assist
system is insufficient after the brake pedal
is released, apply more braking power by
depressing the brake pedal again.
The Hill start assist system may not
operate on slight grades. Also, the Hill
start assist system does not operate in the
following cases.
Starting and operating/Hill start assist system
. when starting backward facing uphill
. when starting forward facing downhill
. while the parking brake is applied
. while the ignition switch is in the ACC
or LOCK / OFF position
. while the Hill start assist warning light/
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