Yes you press lock twice within 10 seconds. The indicators with then light up and stay on for a few seconds. The car is now deadlocked and the alarm is activated. Cool thing about it is that if the alarm is tripped, when you next turn the ignition on, it will display in the cluster where on the car the alarm was triggered. (Doors, boot, bonnet etc etc. )
Does this on my SS but if you're not sure if the Lumina is the same, deadlock the car then pop the boot and it should go off.
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