How do I turn the security light off on my 2004 Buick Century

Asked by William Oct 20, 2020 at 04:46 AM about the 2004 Buick Century Sedan FWD

Question type: Maintenance & Repair

How do I reset a 2004 Buick Century Security system
because I put a new battery in and now it won't start at all I
tried to 30 minute relearn procedure but after 10 minutes
to security light does not turn off and it is not flashing
please help

120

TheStern1975 answered 4 years ago

This is a very common problem on GM vehicles. The security system is notoriously known to fail. Basically when you insert your key, the system checks for a certain signal. If the system cannot get the correct signal from the key, it assumes the key is incorrect or you are attempting to hotwire it. The system then goes into SECURITY lockout mode. (prevents vehicle theft) This will either turn off the starter, or the fuel injectors. This has been happening with GM's for a very long time. There is a company called Newrockies inc. that sells a bypass for this online. Works great.

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