Porsche Cayenne 2009 Owner's Manual page 170

A - SET (Store speed)
1 - RESUME - Switch on/resume cruise control readiness
(pull toward driver)
2 - OFF - Interrupt (push away from driver)
3 - + SPEED - Accelerate (raise clockwise)
4 - – SPEED - Decelerate (lower counter-clockwise)
Resuming the stored speed
f Pull back the operating lever to position 1.
Note on operation
The stored speed should only be recalled when
traffic conditions and the road surface so permit.
170
Driving and Driving Safety
Switching cruise control readiness off
f Push forward the operating lever to position 2
until it clicks audibly into place.
The memory is cleared and the green
readiness light goes out.
When the vehicle is parked and the ignition
switched off, the memory is cleared.
Tip on driving
On upward or downward slopes, the set speed
cannot always be maintained by cruise control.
f To obtain sufficient engine braking or a better
engine-speed range, therefore, you have to
change down to a lower gear.