DTC P1388: AUTO SHUTDOWN RELAY CONTROL CIRCUIT 1. Turn ignition on with engine off. Using scan tool, actuate ASD relay. Listen for clicking sound at ASD relay. The ASD relay is located in power distribution center at driver's side front corner of engine compartment. See Fig. 54 . If clicking sound is heard at ASD relay, go to next step. If clicking sound is not heard at ASD relay, go to step 4 . 2. Stop actuation of ASD relay