the OBD II Port, the instrument cluster and the a/c all went out at the same time. We have talked to several different people and got different options as to what is wrong.
What I do know is that none of the fuses are bad, we check everyone one under hood and in the car.
Possible issues listed:
ignition switch
BCM
short caused them all to all go bad

I could use any and all input on this
Thanks ahead of time

 

provide the year, engine size and maybe someone can help you

 

its the 3.9 ltr, flex fuel, 2009, chevy impala

 

in the underhood fuse block, check this fuse: 10 amp airbag/display fuse. You need to check if this fuse has battery voltage on both sides of the fuse with the key in run. this fuse powers the hvac(heater controls) module, ipc (cluster), sdm(airbag module) and the passenger airbag indicator light. Are all those devices out?