Airbag Dash Alert Won't Turn Off

Hi Folks,
I have a 2015 Access Cab: Last week I had new speakers (in the door) and new subwoofer (between rear seats) installed and an amp under one front seat, some kind of crossovers under the other front seat.
The guy who installed took the seats out and put them back in and everything looks good. However, there is now an airbag icon lit up on the dash. Does this mean that he undid some wires and didn't hook them back up? Can I check the connections myself? I am a total novice.
Thanks for any advice,
Oski

 

Check underneath the seat/s and see if any plugs are undone, I recommend unplugging the battery just in case. Also the clock under the radio is it working? If he failed to plug it back in the light will come on.

 

Thanks, I will check the plugs and wires for what I can see without removing the seats. I know the clock is working (it says the wrong time because the battery was disconnected while the work was getting done and I haven't reset). Thank you.

 

Sounds like a seat plug is disconnected.

 

If that light is on, no air bags, period, so think about driving with others in the truck.

 

Thanks for the tip: this is a safety issue and I need to get onto it now.