2005 Cherokee Airbag Light after Deck Ins

Hey guys, wondering if anyone has run into this. Did a deck, 4ch and minidisk changer in an 05 jeep cherokee. Customer came back complaining his pass airbag light no longer goes off after 20 seconds when no one sits in the seat(still turns off when someone sits there though) so we had him bring it to jeep to check the sensors.. The radio is databus and the car throws a code for the radio and the airbag system needed to be reset and the seat sensor recalibrated by weights.. all the wiring checked out.. i have no idea why this happened.. has anyone run into this before? it just cost me 90.10 and i want to save someone else a headache... Any input would be great... -MikeDriving a Bagged, Caddied 02 s10

grand cherokee sorry..   its too long for the tittle ok.. lolDriving a Bagged, Caddied 02 s10