How can I find someone using their phone?

I have reason to believe a friend has gone to take his life. After a couple of weeks of not feeling well he called from the car crying and saying how much he loved everyone. We were unable to get him to tell us where he is going. He hung up. Police have been notified but the not until 24 hrs missing rule is in effect still.
Is there no service available that can find someone by their phone ? His phone keeps ringing as we continue to call him so he did not turn of off.
Is there a way to track him or to remotely make his phone dial 911?