Fiat Multipla Owner's Handbook Manual page 16

WARNING
WARNING
16
STEERING COLUMN LOCK
To engage the lock: when the key is at STOP, or PARK, remove the
ignition key and turn the steering wheel until it locks.
To disengage the lock: rock the steering wheel slightly as you turn the
key to MAR.
F0E0010m
Never remove the ignition key while the car is moving. The steering wheel would
automatically lock as soon as you try to turn it. This also applies when the car is
being towed.
It is absolutely forbidden to carry out whatever after-market operation involving
steering system or steering column modifications (e.g.: installation of anti-theft
device) that could badly affect performance and safety, cause the lapse of
warranty and also result in non-compliance of the car with homologation
requirements.