Turning the ignition key to MAR the warning light on the dial turns on, but it should go off after few seconds.
If the warning light stays on (on certain versions together with the message on the display), you will not have steering assistance and the effort on the steering wheel will be increased, steering is however possible. Contact Fiat Dealership.
See also:
Radio-frequency remote control: ministerial homologation
The homologation number is printed directly on the key grip for the markets where
this is required. ...
Engine codes - bodywork versions
...
Front passenger's airbag deactivated
(amber)
Warning light comes on when front
passenger’s air bag is deactivated.
With front passenger’s air bag on, turning the ignition key to MAR, warning light
comes on steadily for about 4 s ...