GMC Terrain: Vehicle Security / Vehicle Alarm System
This vehicle has an anti-theft alarm system.
The indicator light, on the instrument panel near the windshield, indicates the status of the system:
Off : Alarm system is disarmed.
On Solid : Vehicle is secured during the delay to arm the system.
Fast Flash : Vehicle is unsecured. A door, the hood, or the liftgate is open.
Slow Flash : Alarm system is armed.
Arming the Alarm System
- Turn off the vehicle.
- Lock the vehicle in one of
two ways:
- Use the RKE transmitter.
- With a door open, press the
interior
.
- After 30 seconds the alarm
system will arm, and the
indicator light will begin to
slowly flash indicating the
alarm system is operating.
Pressing
on the RKE
transmitter a second time will
bypass the 30-second delay
and immediately arm the alarm
system.
The vehicle alarm system will not arm if the doors are locked with the key.
If the driver door is opened without
first unlocking with the RKE
transmitter, the horn will chirp and
the lights will flash to indicate
pre-alarm. If the vehicle is not
started, or the door is not unlocked
by pressing 
on the RKE
transmitter during the 10-second
pre-alarm, the alarm will be
activated.
If a door, the hood, or the liftgate is opened without first disarming the system, the turn signals will flash and the horn will sound for about 30 seconds. The alarm system will then re-arm to monitor for the next unauthorized event.
Disarming the Alarm System
To disarm the alarm system or turn off the alarm if it has been activated:
- Press
on the RKE
transmitter. - Start the vehicle.
To avoid setting off the alarm by accident:
- Lock the vehicle after all occupants have left the vehicle and all doors are closed.
- Always unlock a door with the RKE transmitter.
Unlocking the driver door with the key will not disarm the system or turn off the alarm.
How to Detect a Tamper Condition
If 
is pressed on the RKE
transmitter and the horn chirps and
the lights flash three times, an alarm
occurred previously while the alarm
system was armed.
If the alarm has been activated, a message will appear on the Driver Information Center (DIC).
Vehicle Security
T..
Immobilizer Operation
This vehicle has a passive
theft-deterrent system.
The system does not have to be
manually armed or disarmed.
The vehicle is automatically
immobilized when the transmitter
leaves the vehicle...
Other information:
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GMC Terrain 2018-2025 Owners Manual: Passenger Sensing System
The passenger sensing system turns off the front outboard passenger frontal airbag under certain conditions. No other airbag is affected by the passenger sensing system. See Passenger Sensing System. The passenger airbag status indicator will light on the overhead console when the vehicle is started...
