Hey guys I had a code b3770 mode door actuator that was bad I replaced it with with a ac delco and it still don’t work. I can manually move the actuator with a power probe but it won’t with the command sent from
control head. I even replaced the control head unit
still no response. I delete the code with my computer scanner and it still won’t go away it keeps coming back. I check the movement with the scanner and it won’t show any reading from command all the reading are 0 which is odd for the mode door . I have proper voltage readings and power going to the harness wire that’s connected to the actuator but still no luck. Any ideas