No power to the heater control

The car was involved in a minor front end collision. I replaced the hood, fender, and bumper alokng with new headlights. The problem is that since the accident the heater and a/c won't turn on. The only power going to the heater control is from the lights. No matter what buttons are pushed there is nothing happening. I've checked all the fuses and they are all good are. I'm at a lose and hope someone can point me in the right direction and maybe supply me with a wiring diagram so I can trace the problem. also ithe heater control is manual rather than the climate control.