I want to know where the Automatic Shutdown Relay is located

Well, I found that answer in my repair manual. The problem is, in what appears to be the PDC, there is nothing marked as the ASR. Now there is another group of three relays mounted to the firewall next to the brake cylinder, but none of those relays are marked either. I'll see about locating the Fuel Pump Relay, though. I appreciate your time and response. Thanks.