Porsche Cayman Owner's Manual page 154

Rear wiper
6 – Rear window wiper - intermittent opera-
tion:
Move wiper lever forwards to the first click.
The rear window wiper wipes at preset
intervals.
The rear wiper is automatically switched off when
a speed of 130 mph (210 km/h) is exceeded. It
is switched on again when the speed falls below
118 mph (190 km/h).
On vehicles with the Sport Chrono Plus
Package, further rear wiper functions can
be selected via the PCM.
152
Controls, Instruments
Please observe the chapter "Individual
Memory" in the separate PCM operating
instructions.