SiriusXM may be responsible for transmitting the OS update for their hardware stack over the satellite, but the chances are vanishingly small that SiriusXM is responsible for designing, testing, and queuing for delivery OS updates to a car manufacturer's hardware stack.

Blaming SiriusXM for the issue masks that, but they can be called to question more accurately as a result by the press:

* Did Fiat-Chrysler negotiate phased-deployment and day-of-week criteria with SiriusXM, or was SiriusXM alone responsible for those choices?

* Can SiriusXM release OTA firmware updates for the hardware stack in these vehicles without the cooperation and signoff of Fiat?

* Why did the firmware's watchdog process fail to detect the crash-reboot loop (or is no watchdog present), and do they intend to correct that failing in the future so that such crashes result in an automatic firmware rollback in the future?