More 355 HVAC questions.

My 355 has no stepper motor action. Blower and AC work fine but Vent, Heater Valve and recirc flapper, motors are dead. I'm going to test the heater valve but, it is unlikely that all three motors went TU simultaneously. It is not the ECU and NOT the controller. I've swapped em to check. I'm looking at relays next. Does anyone have any insight into this problem or at leat a good wiring diagram. There are two gray relays next to the hidden 30 amp fuse. They seem to be wired in but, I need a diagram or some help. Plese chime in if you know. Thanks, Hugh