Fiat Coupe TRW Airbag error

[alegsxr]

Hi to all,

i have a Fiat Coupe 20vt that have the airbag light on.
I tried to diagnose but the ecu not responding.
I tried to change the Ecu with another one used but, when the car stay off for some hour and then turn on, the airbag light is off and i can diagnose the ECU.

I have this error in multiecuscan:

07 - airbag warning lamp in s.c. to gnd or o.c fiat

After few minute that all works fine and without start the car, the airbag light is turned on and the ECU not responding.

Any idea?

Thanks
Alessio

[shpuncik]

find wiring diagram for airbag module and check it. looks like there is either short or open circuit somewhere or bad ground.