In this video I will show you how to test a power door lock circuit using just a voltmeter and a test light. The procedures shown in this video can be applied to all types of computer controlled door lock circuits, not just Subaru.

Engine Performance Diagnostics chapter 2

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  • how to determine circuit design with a voltmeter and wiring diagram
  • how to perform a switch input bypass test
  • what is the difference between a switch input and a conventional switch

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(Chapter 2) Switch Inputs, digital signals, module communication, hall effect testing

Related videos:

Switch Input Identification Variables:


Honda VTEC System Testing (P1259 trouble code):


Electronic Switch Inputs (a free ScannerDanner Premium video):


Section 2 "Classroom Lecture" preview (an SD Premium video):


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium. There is a 14 day free trial.

On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!