1997 MERCEDES-BENZ ML500 instrument cluster

29 Central locking system
Te ch n ica l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Note:
For operation in the USA only: This device complies
with Part 15, Subpart C, Section 209 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received,
including interference that may cause undesired
operation.
WARNING: Changes or modification not expressly
approved by party responsible for compliance could void
the users’s authority to operate the equipment.Mechanical keys
The mechanical keys fit all locks on the vehicle.
Notes:
Use of the key does not operate the central locking
system or arm or disarm the antitheft alarm system.
The alarm sounds when unlocking the door. Cancel
alarm by turning key in steering lock to position 1, or
with the remote control by pressing buttonŒ.

30 Central locking system
Te ch n ica l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Doors
1Opening – pull handle
2Unlocking driver’s door lock
3Locking driver’s door lock
4Individual door from inside:
Push lock button down to lock.
Pull lock button up to unlock.5Front door from inside:
Pull handle to unlock.
Important!
The mechanical key does not operate the central locking
system or arm or disarm the antitheft alarm system.
When you lock the driver’s door with the mechanical
key, the door lock button should move down.
P72.10-2103-26

31 Central locking system
Te ch n ica l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Each individual door and the liftgate must be locked
with the respective door lock button – the driver’s door
can only be locked when it is closed.
Notes:
The alarm sounds when unlocking the driver’s door.
Cancel alarm by turning key in steering lock to
position 1, or with the remote control by pressing
buttonŒ.
If the vehicle has previously been locked from the
outside, only the door being opened from the inside will
unlock, and the alarm will come on. The remaining
doors, the liftgate and fuel filler flap remain locked.
In case of a malfunction in the central locking system
the doors can be locked and unlocked individually.To lock, push down lock buttons and turn mechanical
key in driver’s door lock to position 3. In addition lock
the liftgate.
To unlock, pull inside door handles and turn mechanical
key in driver’s door lock to position 2.
Rear doors, previously centrally locked, can be opened
from inside by first unlocking the vehicle with the
central locking switch, see page 32, or by first pulling
up the door lock button.
If the fuel filler flap cannot be opened, see page 274.

32 Central locking system
Te ch n ica l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Central locking switch
1Locking
2Unl ock ing
The central locking switch is located on the center
console.
The doors and trunk can only be locked with the central
locking switch, if the front doors are closed.
If the vehicle was previously locked with the remote
control, the doors and liftgate cannot be unlocked with
the central locking switch.Automatic central locking
The central locking switch also operates the automatic
central locking.
With the automatic central locking system activated and
the engine running, the doors and trunk are locked at
vehicle speeds of approximately 9 mph (15 km / h) or
more.
To a c t i v a te :
With key in steering lock position 2 hold upper portion
of switch (1) for a minimum of 5 seconds.
To deactivate:
With key in steering lock position 2 hold lower portion
of switch (2) for a minimum of 5 seconds.

33 Central locking system
Te ch n ica l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Notes:
If doors are unlocked with the central locking switch
after activating the automatic central locking, and
neither door is opened, then the doors remain unlocked
even at vehicle speeds of approximately 9 mph
(15 km / h) or more.
If a door is opened from the inside at speeds of
approximately 9mph (15km/h) or less with the
automatic central locking activated, the door will again
be automatically locked at speeds of approximately
9 mph (15 km / h) or more.
Important!
When towing the vehicle, or with the vehicle on a
dynamometer test stand, please, note the following:
With the engine running, the vehicle doors will lock if
the left front wheel spins at vehicle speeds of
approximately 9 mph (15 km / h) or more.
To prevent vehicle door locks from locking, deactivate
the automatic central locking.Emergency unlocking in case of accident
The doors unlock automatically a short time after an
accident in which an airbag or emergency tensioning
retractor deploys (this is intended to aid rescue and
exit). However, the key must still be in the steering lock
position 1 or 2.
Additionally the hazard warning flashers turn on
automatically and the interior lights switch on for
approximately 30 minutes.

34 Central locking system
Te ch n ica l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Liftgate
1Grip molding
2Handle, outside
3Recessed grip
To o pen :
From outside of vehicle, pull on handle (2).
To cl os e:
Pull down on recessed grip (3), and close by using the
grip molding (1).1Handle, inside
2Locking
3Unlocking
Important!
In case of danger, the unlocked liftgate can be opened
with the inside or outside handle.
Only drive with the liftgate closed as otherwise exhaust
fumes may enter the vehicle interior.

35 Antitheft alarm system
Te ch n ica l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Antitheft alarm system
The indicator lamp is located in the center console.
The antitheft alarm is automatically armed or disarmed
with the remote control by locking or unlocking the
vehicle.
The antitheft alarm is armed within approximately
15 seconds after locking the vehicle with the remote
control.
A blinking lamp in the center console indicates that the
alarm is armed.
Notes:
Use of the key in the front door locks does not arm or
disarm the antitheft alarm system.
The alarm sounds when unlocking the driver’s door
with the mechanical key. Cancel alarm by turning key in
steering lock to position 1, or with the remote control by
pressing buttonŒ.
If the vehicle battery voltage falls below 10 volts, the
alarm is automatically canceled and the antitheft alarm
system is disarmed. When the voltage is above this
value again, the antitheft alarm system is armed again.Operation:
Once the alarm system has been armed, the turn signal
lamps will flash rapidly (approximately 3 minutes) and
the horn will sound intermittently (approximately
30 seconds) when someone:
•opens a door,
•opens the liftgate,
•opens the hood,
•breaks a window,
•attempts to raise the vehicle.
The alarm will stay on even if the activating element (a
door, for example) is immediately closed.
If the alarm stays on for more than 20 seconds, an
emergency call is initiated automatically. See Tele Aid
on page 148.
Note:
The alarm system will cycle three times when triggered.
The interior lights are automatically switched on when
the alarm comes on and go out when canceling the
alarm.

36 Tow-away protection
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data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Tow-away alarm and glass breakage sensor
The switch is located in the overhead console.
The tow-away alarm and glass breakage sensor are part
of the antitheft alarm system.
Once the alarm system has been armed, the turn signal
lamps will flash rapidly and the horn will sound when
someone attempts to raise the vehicle, or breaks a
window and reaches into the passenger compartment.The alarm will last approximately 3 minutes in the form
of rapidly flashing turn signal lamps. At the same time
the horn will sound for approximately 30 seconds. The
alarm will stay on even if the vehicle is immediately
lowered.
If the alarm stays on for more than 20 seconds, an
emergency call is initiated automatically. See Tele Aid
on page 148.
To prevent triggering the tow-away alarm feature, switch
off the tow-away alarm and glass breakage sensor before
towing the vehicle, or when parking on a surface subject
to movement, such as a ferry or auto train.
To do so, turn key in steering lock to position 1, then
return it to position 0 and remove key from steering
lock.
Within 30 seconds, push left or right button. (On
vehicles equipped with optional trip computer, push
RESET or MODE button, display shows OFF.)
Exit vehicle, and lock vehicle with remote control.
The tow-away alarm and glass breakage sensor remain
switched off until the key is inserted in steering lock
and turned to position 1.