Question about 2005 Buick Century
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Sounds like you have 2 problems. The buzzing relay could be a bad relay, or
the connection in the fuse block. Have had some problems in the block with corroded wires, or
loose connections that the relay plugs into.
The security light is the next thing. With the security light on/flashing, the car will not start. With
that light on, the computer is disabling the fuel injector circuit. After a try to start, it wont or dies,
leave key on for 10-12 minutes, or until light goes out. Then turn off key for 10 seconds, turn key
to 'on' position for 5 seconds, then turn to start and it should. This is a theft re-learn procedure,
and will sometimes remedy the situation for the time being, but will have to repair the problem. A
scanner should show codes(s) like b2958, b2960.
A common problem is the ignition cylinder and/or the ignition switch. With the buzzing of the relay,
i would say all this may be related to the ignition switch. A low voltage supply to any of the circuits
that the switch feeds will give strange electrical conditions. If going to replace the ignition switch,
then also do the cylinder at the same time. With all things described, sure sounds like the ignition
P.S. The locks may be related to the ignition switch problem or not at all. With that said, would
suggest looking at the BCM(body control module)It control locks, and also has allot to do with the
security system. See picture at bottom of this page of corroded BCM connectors.
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