Mercedes-Benz GL450 Operator's Manual page 111

Controls in detail
Locking and unlocking
Global locking
Press button ‹.
With the tailgate and all doors closed,
the turn signal lamps flash three times.
The locking knobs in the doors move
down. The anti-theft alarm system is
armed.
Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey so that
pressing button Πonly unlocks the
driver's door and the fuel filler flap.
Press and hold buttons Œ and ‹
simultaneously for about 5 seconds
until battery check lamp 5
( page 108) flashes twice.
The SmartKey will then function as
follows:
110
Unlocking driver's door and fuel filler
flap
Press button Πonce.
All turn signal lamps flash once. The
locking knob in the driver's door moves
up. The anti-theft alarm system is
disarmed.
Global unlocking
Press button Πtwice.
All turn signal lamps flash once. The
locking knobs in the doors move up.
The anti-theft alarm system is
disarmed.
Global locking
Press button ‹.
With the tailgate and all doors closed,
the turn signal lamps flash three times.
The locking knobs in the doors move
down. The anti-theft alarm system is
armed.
Restoring to factory setting
Press and hold buttons Œ and ‹
simultaneously for about 5 seconds
until battery check lamp 5
( page 108) flashes twice.
!
If you cannot lock or unlock the vehicle with
the SmartKey, the batteries in the SmartKey are
discharged, the SmartKey is malfunctioning, or
the vehicle battery is drained.
Check the batteries in the SmartKey and
replace them if necessary ( page 498).
Use the mechanical key to unlock the
driver's door ( page 493).
Lock the vehicle as described in the
"Practical hints" section ( page 494).
Have the vehicle battery and the vehicle
battery connections checked ( page 521).
If the SmartKey is malfunctioning, contact
Roadside Assistance or an authorized
Mercedes-Benz Light Truck Center.