Here's some info as it sound like the theft deterrent is armed.
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Reset Procedure
NOTE: This information applies to a Vehicle Theft Security System
(VTSS) that was armed when the battery was disconnected and
reconnected.
When the armed VTSS senses that the battery has been disconnected and
reconnected, it enters its power-up mode. In the power-up mode the
alarm system remains armed following a battery failure or disconnect.
If the VTSS was armed prior to a battery disconnect or failure, the
system will have to be actively or passively disarmed following a
battery reconnection.
The power-up mode will also apply if the battery goes dead while the
system is armed and battery jump-starting is attempted. The engine
no-run feature will prevent the engine from starting until the alarm
system has been actively or passively disarmed.
Passive disarming of the Vehicle Theft Security System
(VTSS)
occurs when the vehicle is unlocked using the key to unlock either front
door or the liftgate. Active disarming of the VTSS occurs when the
vehicle is unlocked by depressing the Unlock button of the
Remote Keyless Entry (RKE) transmitter.
Once the alarm has been activated (horn sounding, lights flashing, and
the engine no-run feature), either disarming method will deactivate the
alarm.
Depressing the Panic button (if equipped) on the RKE transmitter will
also disarm the VTSS, but the horn will sound and the lights will flash
for about three minutes as part of the Panic feature. The horn and
lights can be stopped by pressing any of the RKE transmitter's buttons
or driving the vehicle above 15 mph.
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