#define ACC digitalRead(25)
#define DOOR_JAMB digitalRead(12)

void setup() {
  Serial.begin(115200);
  pinMode(4, OUTPUT);
  pinMode(25, INPUT);
  pinMode(12, INPUT);
}

void loop() {
  if (ACC == LOW && DOOR_JAMB == LOW) { // If ACC is off and door is closed
      digitalWrite(4, HIGH); // Turn dome light on
      Serial.println("Dome light is on...");
      // 20 second counter in here eventually
    } else {
      digitalWrite(4, LOW); // Turn dome light off
      Serial.println("Dome light is off");
    }
    delay(10); // 100 Hz is plenty
  }