Hi,
Here is a guide that explains what happens with these systems. Also, there is a GM specific section that talks about how to disarm the system.
Also, what is meant by you can't get codes? Normally when this light is on, there are codes to go with it. Please refer to the attached document from the service manual. The codes are needed to tell for sure what is happening.
https://www.2carpros.com/articles/how-to-reset-a-security-system
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Sunday, August 25th, 2019 AT 12:54 PM