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 switch. 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 alot to do with the security system. See picture at bottom of this page of corroded BCM connectors.
4- Passlock Ignition lock
cylinder removed.
Install new cylinder.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
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