I too had this happen. After a battery disconnect, I lost both the wiper and defrost. Turns out I needed to reset the rear window auto-down function:
1. Turn ignition switch to the “ON” position.
2. Push the back door power window switch to the “DOWN” side to open the window.
3. Push and hold the back door power window switch to the “UP” side until the window closes. Continue holding it for a couple seconds.
4. Check for proper operation of the “one-touch open/close” functions by pushing the switch briefly to the “DOWN” and “UP” position.
When the auto-down feature is restored, the wiper and defrost should come back too.