yes, what aaa is saying is the buzz is just a seatbelt warning. the GP's stay on for up to 3 minutes, depending on the model controller.
1. buckle seat belt.
2. turn on key, and listen for the CLICK from the controller.
3. when the click repeats, the plugs have turned off. you can tell by the dome light brightening.
4. start the car, if it starts fast, you've found the issue you've been having.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!