check your installation job for missing grounds. Then verify power at the proper terminals in the ecm. BE SURE to probe the harness with the connector unplugged to avoid probing the wrong terminal and cooking something. There shoould be 1 or 2 power wires, maybe even 3, one allways hot and 1 or 2 that are switched, I dont have the schematic in front of me or I would coach you through it. Get one and check the approriate terminals.
Post your results.Peace.