2019 MERCEDES-BENZ AMG GT ROADSTER Owner's Manual

Should it, in exceptional circumstances, be
absolutely necessary to disconnect the 12-
volt battery yourself, please observe the fol-
lowing:
R Secure the vehicle to prevent it from rolling
away.
R Switch off the ignition.
R Disconnect the negative terminal first and
then the positive terminal.
The transmission is locked in position 005D
after disconnecting the battery.
After the work has been done, install the bat-
tery and replace the cover of the positive ter- minal clamp firmly.
Comply with safety precautions and take pro-
tective measures when handling batteries. Risk of explosion.
Fire, open flames and smoking are
prohibited when handling the bat-
tery. Avoid creating sparks.
The electrolyte of the battery is cor-
rosive. Avoid contact with skin, eyes
or clothing.
Wear suitable protective clothing,
especially gloves, apron and face-
guard.
Immediately rinse electrolyte
splashes off with clean water. Con-
tact a physician if necessary. Wear eye protection.
Keep children away.
Observe this Operator's Manual.
For safety reasons, Mercedes-Benz recom-
mends that you only use batteries which have
been tested and approved for your vehicle by
Mercedes-Benz. These batteries provide
increased impact protection to prevent vehicle
occupants from suffering acid burns should the battery be damaged in the event of an accident. In order for the battery to achieve the maximum
possible service life, it must always be suffi-
ciently charged.
Like other batteries, the vehicle battery may
discharge over time if you do not use the vehicle.In this case, have the battery disconnected at a
qualified specialist workshop. You can also
charge the battery with a special charger rec-
ommended by Mercedes-Benz. Contact a quali- fied specialist workshop for further information.
Have the battery condition of charge checked
more frequently if you use the vehicle mainly for
short trips or if you leave it standing idle for a
lengthy period. Consult a qualified specialist
workshop if you wish to leave your vehicle
parked for a long period of time.
When you use the SmartKey in the ignition and
you park the car, remove the SmartKey if you do not require any electrical consumers. The vehi-
cle will then use very little energy, thus conserv-
ing battery power.
If the power supply has been interrupted, e.g. if
you reconnect the battery, you will have to:
R reset the function for automatically folding
the exterior mirrors in/out by folding the mir-
rors out once (Y page 92)
R reset the side windows, see (Y page 78) Charging the battery
! Only use battery chargers with a maximum
charging voltage of 14.4 V.
! Only
charge the battery using the jump-
starting connection point.
The jump-starting connection point is in the
engine compartment (Y page 256).
X Open the hood.
X Connect the battery charger to the positive
terminal and ground point in the same order
as when connecting the donor battery in the
jump-starting procedure (Y page 256).
Keep away from fire and open flames. Do not
lean over a battery. Never charge the battery if it is still installed in the vehicle, unless you use a
battery charger which has been tested and
approved by Mercedes-Benz. A battery charger
unit specially adapted for Mercedes-Benz vehi-
cles and tested and approved by Mercedes-
Benz is available as an accessory. It permits the
charging of the battery in its installed position.
Contact an authorized Mercedes-Benz Center Battery (vehicle)
255Breakdown assistance Z

for further information and availability. Read the
battery charger's operating instructions before
charging the battery.
Do not charge a battery which has been
removed at low temperatures with a battery
charger. Allow the battery to warm up gently
first, if necessary. Otherwise, the service life can be shortened and the starting characteristics
impaired, especially at low temperatures. Replacing the 12 V battery
Observe the notes on the 12 V battery
(Y page 254).
Mercedes-Benz recommends that you have the
12 V battery replaced at a qualified specialist
workshop, e.g. at an authorized Mercedes-Benz
Center.
If you want to replace the battery yourself,
observe the following notes:
R Always replace a defective battery with a bat-
tery which meets the specific requirements of
the vehicle. The vehicle is equipped with an AGM (Absorb-
ent Glass Mat) technology battery or a lith-
ium-ion battery. Full vehicle functionality is
only guaranteed with an AGM or lithium-ion
battery. For safety reasons, Mercedes-Benz
recommends that you only use batteries
which have been tested and approved for yourvehicle by Mercedes-Benz.
R Use detachable parts such as breather hoses,
angled connecting pieces or terminal covers
from the battery which is to be replaced.
R Make sure that the vent hose is always con-
nected to the original opening on the battery
side.
Install any existing or supplied stop plugs.
Otherwise, gases or battery acid could
escape.
R Make sure that the detachable parts are con-
nected again in the same way. Jump-starting
X For the jump-starting procedure, use only the jump-starting connection point in the engine com-
partment, consisting of a positive terminal and a ground point.
! Avoid repeated and lengthy starting attempts. Otherwise, the catalytic converter could be
damaged by the non-combusted fuel.
X Do not start the vehicle using a rapid charging device.
If your vehicle's battery is discharged, the engine can be jump-started from another vehicle or
from a donor battery using jumper cables.
The battery is not accessible in all vehicles. If the other vehicle's battery is not accessible, jump-start the vehicle using a donor battery or a jump-starting device.
Observe the following during the jump-starting procedure:
R the jumper cables must not come into contact with parts that can move when the engine is
running, such as the V-belt pulley or the fan.
R non-insulated parts of the terminal clamps must not come into contact with other metal parts
while the jumper cables are connected to the battery and the jump-starting connection point.
R only use jumper cables that are not damaged and have a sufficient cross-section and insulated
terminal clamps.
R jump-starting may be performed only using batteries with a nominal voltage of 12 V.
R you may only jump-start the vehicle when the engine and exhaust system are cold.
R the vehicles must not touch each other.
R If the battery is fully discharged, leave the battery that is being used to jump-start connected for
a few minutes before attempting to start. This charges the battery slightly. 256
Jump-startingBreakdown assistance

X
Secure the vehicle by applying the electric parking brake.
X Shift the transmission to position 005D.
X Make sure the ignition and all electrical consumers are switched off.
All indicator lamps in the instrument cluster must be off. When using the SmartKey, turn the
SmartKey to position 0092in the ignition lock and remove it (Y page 111).
X Open the hood.
i Right-hand-drive vehicle:
the jump-starting connection points may be located on the other
side of the vehicle. Vehicles with a carbon-fiber engine cover
X To remove the cover: turn fasteners0043a00C4 turn and remove. All vehicles:
X Slide cover 0083of positive terminal 0043in the direction of the arrow.
X Connect positive terminal 0043on your vehicle to positive terminal 0044of donor battery 0084using the
jumper cable. Always begin with positive terminal 0043on your own vehicle first.
X Start the engine of the donor vehicle and run it at idling speed.
X Connect negative terminal 0087of donor battery 0084to ground point 0085of your vehicle using the
jumper cable. Begin with donor battery 0084first. Jump-starting
257Breakdown assistance Z

X
Start the engine of your own vehicle.
X Let the engines run for several minutes.
X Before disconnecting the jumper cables, switch on an electrical consumer in your own vehicle,
e.g. the rear window heating or the lighting.
X When the jump-starting procedure is finished: first, remove the jumper cables from ground
point 0085and from negative terminal 0087of the donor battery, and then from positive terminal 0043
and positive terminal 0044of the donor battery. Begin each time at the contacts on your own vehicle
first.
X After removing the jumper cables, close cover 0083of positive terminal 0043.
X Only for vehicles with a carbon-fiber engine cover: insert the cover of the jump-starting
connection point. Make sure all mountings for the fasteners are positioned precisely behind the corresponding recesses in the cover.
Press the fasteners into the mountings. Turn the fasteners by 00C4of a turn to engage.
X Have the battery checked at a qualified specialist workshop.
Jump-starting is not considered to be a normal operating condition.
i Jumper cables and further information regarding jump-starting can be obtained at a qualified
specialist workshop. Towing and tow-starting
Important safety notes
G
WARNING
The rear axle locks when:
R the engine is not running
R the engine stalls while the vehicle is being
towed
R there is a malfunction in the power supply
or the vehicle's electrical system
There is a risk of an accident.
In the event of a breakdown, you should
always have the vehicle transported. G
WARNING
If the brake system or power steering is mal-
functioning and your vehicle is then towed
away, significantly more effort may be
required to steer and brake than is normally
required. There is a risk of an accident.
In such cases, use a tow bar. Before towing,
make sure that the steering moves freely. G
WARNING
When towing or tow-starting another vehicle
and its weight is greater than the permissible gross weight of your vehicle, the:
R the towing eye could detach itself
R the vehicle/trailer combination could roll-
over.
There is a risk of an accident.
When towing or tow-starting another vehicle,
its weight should not be greater than the per- missible gross weight of your vehicle.
Details on the permissible gross vehicle weight
of your vehicle can be found on the vehicle iden-
tification plate (Y page 287).
! Use the SmartKey instead of the Start/Stop
button when towing the vehicle.
Start the engine and keep it running. The
SmartKey is in position 0048in the ignition lock.
Set the transmission to 005Cusing the E-
SELECT selector lever. Make sure that you
then leave the SmartKey in position 0048.
Check the transmission position in the instru-
ment cluster.
! Make sure that the electric parking brake is
released. If the electric parking brake is faulty,
visit a qualified specialist workshop. 258
Towing and tow-startingBreakdown assistance

!
Secure the tow rope or tow bar to the towing
eye only. Otherwise, the vehicle could
become damaged.
! When Active Brake Assist, Active Distance
Assist DISTRONIC or the HOLD function is
activated, the vehicle brakes automatically in
certain situations.
To avoid damage to the vehicle, deactivate
these systems in the following or similar sit-
uations:
R when towing the vehicle
R in the car wash
! Do not use the towing eyes for recovery pur-
poses as this could damage the vehicle. If in
doubt, recover the vehicle with a crane.
! When towing, pull away slowly and
smoothly. If the tractive power is too high, the
vehicles could be damaged.
! Shift the automatic transmission to position
005C and do not open the driver's or front-
passenger door when towing the vehicle
away. Otherwise, the automatic transmission may shift to position 005Dwhich can cause
damage to both vehicles.
! Do not tow with sling-type equipment. This
could damage the vehicle.
! You may tow the vehicle for a maximum dis-
tance of 30 miles (50 kilometers). A towing
speed of 30 mph (50 km/h) must not be
exceeded.
For towing distances over 30 miles
(50 kilometers), the entire vehicle must be
raised and transported.
! Observe the transmission fluid temperature
(AMG menu) in the on-board computer when
towing. The transmission oil temperature
must not exceed 250 ‡ (120 †). If this
occurs, you must stop towing immediately.
! Tow-starting the vehicle is not permitted.
The transmission may otherwise be damaged.
Also observe the following notes:
R If the engine does not start, try jump-starting
it (Y page 256). Tow-starting the vehicle is not
permitted.
R If it is not possible to jump-start the vehicle,
have it transported to the nearest qualified
specialist workshop, e.g. an authorized
Mercedes-Benz Service Center. If the vehicle can no longer be driven because of
an accident or breakdown, you have the follow- ing options:
R Transporting the vehicle.
As a rule, you should have the vehicle trans-
ported.
R Towing the vehicle with a tow rope or tow bar.
Only tow the vehicle in exceptional cases. The
engine must be running if you tow the vehicle with a tow rope or tow bar.
If the vehicle has suffered transmission damage, have it transported on a transporter or trailer.
Observe the display messages in the instrument
cluster.
The battery must be connected and charged.
Otherwise, you:
R will not be able to switch on the ignition with
the Start/Stop button
R cannot start the engine
R cannot release the electric parking brake.
R cannot shift the automatic transmission to
position 005C
Disarm the automatic locking feature before the vehicle is towed (Y page 73). You could other-
wise be locked out when pushing or towing the
vehicle. Permitted towing methods
Mercedes-Benz recommends transporting your
vehicle in the case of a breakdown, rather than
towing it away.
When towing away, use a towing rope or a tow-
ing bar with both axles on the ground. Do not use any tow bar systems. Installing/removing the towing eye
Installing the towing eye The bracket for the screw-in towing eye is
behind the radiator trim.
X Remove the towing eye from the vehicle tool
kit (Y page 249). Towing and tow-starting
259Breakdown assistance Z

X
Pull out cover 0043.
X Screw in the towing eye clockwise to the stop.
Removing the towing eye X
Loosen the towing eye and unscrew it.
X Fully reinsert cover 0043.
X Put the towing eye back into the vehicle tool
kit. Towing a vehicle with both axles on
the ground
It is important that you observe the safety
instructions when towing away your vehicle
(Y page 258).
The automatic transmission automatically shifts
to position 005Dwhen you open the driver's or
front-passenger door or when you remove the
SmartKey from the ignition lock. In order to
ensure that the automatic transmission stays in position 005Cwhen towing away the vehicle, you
must observe the following points:
X Insert the SmartKey into the ignition lock. You
must use the SmartKey instead of the Start/
Stop button (Y page 111).
X Start the engine and leave it running during
the entire towing procedure.
X Depress and hold the brake pedal.
X Move the transmission to position 005Cwith the
E-SELECT lever.
X Check the transmission position using the
indicator in the multifunction display
(Y page 119).
X Release the brake pedal.
X Release the electric parking brake.
X Switch on the hazard warning lamps
(Y page 98). In order to signal a change of direction when
towing the vehicle with the hazard warning
lamps switched on, use the combination switch as usual. In this case, only the indicator lamps
for the direction of travel flash. After resetting
the combination switch, the hazard warning
lamp starts flashing again. Transporting the vehicle
!
When the vehicle is loaded for transport, the
front and rear axles must be stationary and on the same transportation vehicle. Positioning
over the connection point of the transport
vehicle is not permitted. The drive train may
otherwise be damaged.
! You may only secure the vehicle by the
wheels, not by parts of the vehicle such as
axle or steering components. Otherwise, the
vehicle could be damaged.
The towing eye can be used to pull the vehicle
onto a trailer or transporter for transporting pur- poses.
X Insert the SmartKey into the ignition lock. You
must use the SmartKey instead of the Start/
Stop button (Y page 111).
X Start the engine and leave it running during
the entire loading operation.
X Move the transmission to position 005Cwith the
E-SELECT lever.
X Check the transmission position using the
indicator in the multifunction display
(Y page 119).
As soon as the vehicle has been loaded:
X Prevent the vehicle from rolling away by
applying the electric parking brake.
X Shift the automatic transmission to position
005D. 260
Towing and tow-startingBreakdown assistance

X
Turn the SmartKey to key position 0092in the
ignition lock and remove it.
X Secure the vehicle. Tow-starting (emergency engine
starting)
! Vehicles with automatic transmission must
not be tow-started. You could otherwise dam- age the automatic transmission.
i You can find information on "Jump-starting"
under (Y page 256). Fuses
Important safety notes
G
WARNING
If you manipulate or bridge a faulty fuse or if
you replace it with a fuse with a higher amper- age, the electric cables could be overloaded.
This could result in a fire. There is a risk of an
accident and injury.
Always replace faulty fuses with the specified
new fuses having the correct amperage.
Blown fuses must be replaced with fuses of the
same rating, which you can recognize by the
color and value. The fuse ratings are listed in the
fuse allocation chart.
The fuse allocation chart is on the fuse box in the trunk (Y page 262).
If a newly inserted fuse also blows, have the
cause traced and rectified at a qualified special-
ist workshop, e.g. an authorized Mercedes-Benz Center.
! Only use fuses that have been approved for
Mercedes-Benz vehicles and which have the
correct fuse rating for the system concerned.
Otherwise, components or systems could be
damaged.
! Make sure that no moisture can enter the
fuse box when the cover is open.
! When closing the cover, make sure that it is
lying correctly on the fuse box. Moisture seep-
ing in or dirt could otherwise impair the oper- ation of the fuses. The fuses in your vehicle serve to close down
faulty circuits. If a fuse blows, all the compo-
nents on the circuit and their functions stop
operating. Before changing a fuse
X Switch off the engine.
X Switch off all electrical consumers.
X Open the driver's door.
The on-board electronics are now in key posi-
tion 0092. This is the same as the key having
been removed.
or, if the SmartKey is inserted in the ignition
lock: X Remove the SmartKey from the ignition lock.
X Secure the vehicle against rolling away
(Y page 127).
All indicator lamps in the instrument cluster
must be off. Fuse box in the front passenger foot-
well
! The floor panel must be installed properly,
otherwise moisture or dirt could impair the
function of the fuses. X
Open the front-passenger door.
X To open: remove the carpet over the footrest.
X Loosen screws 0043on the floor panel using a
suitable tool.
X Remove the floor panel.
X To close: install the floor panel again.
X Screw in and tighten screws 0043.
X Put in the carpet and press to secure. Fuses
261Breakdown assistance Z

Fuse box in the rear
X
To open: from the vehicle interior, lift up
cover 0043between the roll bars in the direction
of the arrow.
X To close: shut cover 0043in the opposite direc-
tion to the arrow and press to secure.
i The fuse allocation chart is located in the
trunk behind the service flap. You can find the
corresponding fuse rating and fuse type on
the fuse allocation chart. 262
FusesBreakdown assistance