A friends car is having intermittent issues with all things ignition switch related. Sometimes the wipers, turn signals, man climate, and windows will cut out.

I today cleaned the contacts on the ignition relay. When You have the signal, wipers, and heater on, and then push the seat heater button, everything then cuts out.

I am gonna hit the pick n pull on Friday. Should I focus on the ignition switch, or ICE box or both?