Hi and thanks for using 2CarPros. Com.
This is a tough one because there are two different systems (smart key and non-smart key) and many things that can be the cause. I have attached flow charts for both to help you try to determine the problem, but I have to be honest, the skill level for these checks is high and requires many different types of tools the average person will not have.
The first three pictures are of the smart key system. Pictures 4 through 6 are of the non smart key.
As I mentioned, it is not an easy fix. I hope in some way this helps.
Take care,
Joe
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Monday, February 22nd, 2021 AT 8:44 AM