Buick Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose).
Do you understand wire diagrams and using a volt meter?
Are you planning to diagnose and fix this yourself or with a helper or just looking for info about possible causes prior to going to a shop?
Since you do not have the tool to diagnose this. Let me know what you want from me so I get you the answer you expect?
The problem with the blogs you have read are they too indicate testing. You do not have the tools to do so. All I can offer at this point is this or that may be to blame. I can not offer help diagnosing and figuring this out without tools.