Here’s a pretty strange and frustrating case study, provided by Chad in Colorado, related to a 2020 Toyota Avalon that, upon turning the vehicle off and exiting it, the infotainment cluster remained on and displayed a “key left vehicle” error message.
He started his diagnostic process, scanning for DTCs and testing the vehicle’s can bus network, which revealed that numerous modules remained on after vehicle shutdown. He then followed a logical diagnostic process to eliminate potential causes and work his way to the root cause. The funny thing is that the source of the problem was an option the vehicle wasn’t even equipped with.
Check out the case study to get the full story.
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