How do I arm and disarm the vehicle alarm system?
To arm the alarm, close the liftgate and hood, turn off the vehicle, and lock it using the RKE transmitter, the Keyless Access system, or the inside lock button — the alarm will arm after 30 seconds, or immediately if Q is pressed a second time on the RKE transmitter. To disarm the alarm or turn it off if activated, press K on the RKE transmitter, unlock the vehicle using the Keyless Access system, or start the vehicle. Note that unlocking the driver door with the physical key will not disarm the system. (Page 29)
From the official Chevrolet Trailblazer manual, page 29
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