I have replaced the Electronic Control Module (ECM), the mass airflow sensor, mass airflow sensor relay and the mass ... two wires are easily seen in a wiring diagram of the vehicle.

Circuit diagram of the PIR Motion Sensor Light and Switch based on SB0061 shown here ... around 3.3 Volt is appeared at the base of Transistor T1 and it conducts to fire the next relay driver ...

With just a Wemos D1 Mini, a standard PIR sensor, and some open source code ... but [Eric] has still gone ahead and provided a wiring diagram so there’s no confusion for young players.