Vehicles power system is disabled as the result of a collision, can an ACN system using a paired cell phone work to notify a PSAP?

It is possible, but, need to re-program the ACN.

Explanation:

In most cases, when the ACN sensor detects either that an air bag has deployed or there’s been a dramatic and sudden deceleration, the system automatically connects to an operator, who will then be able to communicate with passengers in the vehicle after a crash. The operator is also able to collect basic information from the vehicle, without passenger input, to provide to emergency responders so they can easily locate and reach the scene of the crash. ACN usually dials 911 i USA or it locates the nearest hospital and inform them. You will have to Re-program your ACN if you want to contact different cell phone.

i'm so sorry that's not a question and this isn't an answer