No HVAC power

[325issguy]

Hey guys,
Just swapped the m52 into my new 1991 318is. I got the engine running well and everything seems fine, however I am having one problem. I am not getting any power to the heater controls and ac switches.
The engine originally came out of my 1987 325is.
Thanks,
Chris

[MattM]

the hvac runs through the main relay and only works when the ignition is in the run position, did you ever touch the blower motor? unless you cut a wire the engine swap shouldnt have messed with that.

recheck your c101, then if thats all good dive into an ETM

[BeirBrennerE30]

I am guessing your windows dont work either? your unloader relays arent grounded... check pin 15 in c101

[325issguy]

Hey guys,
Meant to say that it was exactly the problem posted about. Pin 15 solved all my problems.
-Chris