brake sensor MERCEDES-BENZ SLK ROADSTER 2014 Owners Manual

Brake fluid
Display message ............................ 229
Notes ............................................. 348
Brake force distribution, elec-
tronic
see EBD (electronic brake force
distribution)
Brake lamps
Adaptive ........................................... 62
Display message ............................ 232
Brakes
ABS .................................................. 60
BAS .................................................. 61
BAS PLUS ........................................ 61
Brake fluid (notes) ......................... 348
Display message ............................ 223
Driving tips .................................... 166
High-performance brake system .... 167
Important safety notes .................. 166
Parking brake ................................ 163
Warning lamp ................................. 252
Breakdown
see Flat tyre
see Towing away
Brightness control (instrument
cluster lighting) ................................... 30
Bulbs
see Replacing bulbs C
Calling up a fault see Display messages
Capacities (technical data) ............... 342
Car
see Vehicle
Car key
see Key
Car wash (care) ................................. 286
Care
Automatic car wash ....................... 286
Carpets .......................................... 292
Display ........................................... 290
Exhaust pipe .................................. 290
Exterior lighting ............................. 289
Gear or selector lever .................... 291
High-pressure cleaner .................... 287
Interior ........................................... 290 Matt paintwork .............................. 288
Note
s............................................. 286
Paint .............................................. 288
Plastic trim .................................... 290
Roof lining ...................................... 292
Seat belt ........................................ 292
Seat cove r..................................... 291
Sensors ......................................... 290
Steering wheel ............................... 291
Trim pieces .................................... 291
Washing by hand ........................... 287
Wheels ........................................... 288
Windows ........................................ 289
Wiper blades .................................. 289
Wooden trim .................................. 291
CD player/CD changer(on-board
computer) .......................................... 207
Central locking
Automatic locking (on-board com-puter) ............................................. 216
Locking/unlocking (key) .................. 73
Centre console
Lower section .................................. 35
Upper section .................................. 34
Changing bulbs
Dipped-beam headlamp s............... 119
Main-beam headlamp s................... 119
Parking lamps (front) ..................... 119
Reversing lamps ............................ 120
Standing lamps .............................. 119
Turn signals (front) ......................... 120
Child seat
Automatic recognition ..................... 52
Forward-facing restraint system ...... 55
On the front-passenger seat ............ 54
Problem (malfunction) ..................... 56
Rearward-facing restraint system .... 55
Recommendations ........................... 58
Suitable positions ............................ 57
Children
Restraint systems ............................ 52
Cigarette lighter ................................ 268
Cleaning
Mirror turn signal ........................... 289
Climate control
Air conditioning ............................. 127
Controlling automaticall y............... 131 6
Index

Important safety notes .................... 41
Pets in the vehicle ........................... 59
PRE-SAFE® (anticipatory occu-
pant protection) ............................... 50
Odometer
see Trip meter
Oil
see Engine oil
On-board computer
AMG menu .....................................2 19
Assistance menu ........................... 210
Audio menu ................................... 207
Convenience submenu .................. 217
Display messages .......................... 222
Displaying a service message ....... .285
DISTRONIC PLUS ........................... 177
Factory setting submenu .............. .218
Important safety notes .................. 200
Instrument cluster submenu .......... 213
Light submenu ............................... 214
Menu overview .............................. 203
Message memory .......................... 222
Navigation menu ............................ 205
Operating the TV ............................ 208
Operating video DVD ..................... 207
Operation ....................................... 201
RACETIMER ................................... 219
Service menu ................................. 212
Settings menu ............................... 213
Standard displa y............................ 204
Telephone menu ............................ 208
Trip menu ...................................... 204
Vehicle submenu ........................... 216
Operating instructions
Vehicle equipment ........................... 22
Operating safety
Declaration of conformity ................ 23
Important safety note ...................... 22
Operating system
see On-board computer
Outside temperature display ........... 201
Overhead control panel ...................... 36P
Paint code .......................................... 342
Paintwork (cleaning instructions) ... 288
Panic alarm .......................................... 40 Park Assist
Parking Guidance ........................... 188
Parking
Important safety notes .................. 162
Parking brake ................................ 163
Position of exterior mirror, front-
passenger side ............................... 105
see PARKTRONIC
Parking aid
see Exterior mirrors
see PARKTRONIC
Parking assistance
see PARKTRONIC
Parking brake
Display message ............................ 226
Electric parking brake .................... 163
Warning lamp ................................. 257
Parking Guidance
Display message ............................ 239
Important safety notes .................. 188
Parking lamps
Changing bulbs .............................. 119
Display message ............................ 233
Switching on/of f........................... 112
Parking lamps (changing bulbs) ...... 119
PARKTRONIC
Deactivating/activating ................. 187
Driving system ............................... 185
Function/note s............................. 185
Important safety notes .................. 185
Problem (fault) ............................... 188
Sensor rang e................................. 185
Warning display ............................. 186
PASSENGER AIR BAG OFF
Indicator lamp .................................. 41
Problems (malfunctions) .................. 56
Petrol .................................................. 344
Pets in the vehicle ............................... 59
Plastic trim (cleaning instruc-
tions) .................................................. 290
Power windows
see Side windows
PRE-SAFE® (anticipatory occupant
protection)
Operation ......................................... 50
PRE-SAFE® (preventive occupant
safety system)
Display message ............................ 230 14
Index

PRE-SAFE® Brake
Activating/deactivating ................. 211
Display message ............................2 30
Function/notes ................................ 66
Warning lamp ................................. 260
Program selector button .................. 154
Protection against theft
ATA (Anti-Theft Alarm system) ......... 68
Immobiliser ...................................... 68
Interior motion sensor ..................... 69
Tow-away protectio n ........................69
Protection of the environment
General notes .................................. 21
Pulling away
Automatic transmission ................. 144
Manual transmission ..................... .144 Q
Qualified specialist workshop ........... 24R
RACETIMER (on-board computer) .... 219
Radar sensor system
Activating/deactivating ................. 217
Display message ............................ 238
Radiator cover ................................... 281
Radio
Selecting a station ......................... 207
Radio-based vehicle components
Declaration of conformity ................ 23
Reading lamp ..................................... 116
Rear foglamp
Display message ............................ 233
Switching on/off ........................... 112
Rear lamps
see Lights
Rear window heating
Problem (fault) ............................... 134
Switching on/off ........................... 133
Rear-view mirror
Anti-dazzle mode (automatic) ....... .104
Dipping (manual) ........................... 103
Refuelling
Fuel gauge ....................................... 30
Important safety notes .................. 158
Notes for AMG vehicles ................. 344 Refuelling process ......................... 159
see Fuel
Releasing the parking lock man-
ually (automatic transmission) ........158
Remote control
Programming (garage door
opener) .......................................... 271
Replacing bulbs
Important safety notes .................. 117
Overview of bulb types .................. 118
Removing/replacing the cover
(front wheel arch) .......................... 118
Reserve (fuel tank)
see Fuel
Reserve fuel
Display message ............................ 237
Warning lamp ................................. 258
Residual heat (climate control) ........135
Restraint system
Display message ............................ 230
Introduction ..................................... 40
Warning lamp ................................. 257
Warning lamp (function) ................... 41
Rev counter ........................................ 201
Reverse gear
Engaging (automatic transmis-
sion) ............................................... 152
Engaging (manual transmission) .... 151
Reversible floor (boot) ......................266
Reversing feature
Side windows ................................... 83
Reversing function
Boot lid ............................................ 81
Reversing lamp
Changing bulbs .............................. 120
Reversing lamp (display message) .. 233
Roof
Display message ............................ 248
Important safety notes .................... 87
Opening/closing (with key) .............. 89
Opening/closing (with roof
switch) ............................................. 88
Overview .......................................... 87
Problem (malfunction) ..................... 94
Relocking ......................................... 89
Roof carrier ........................................ 266 Index
15

Roof lining and carpets (cleaning
instructions)
...................................... 292
Roof switch .......................................... 88 S
Safety Child restraint systems .................... 52
Children in the vehicle ..................... 51
Safety system
see Driving safety systems
Seat belt
Correct usage .................................. 43
Switching belt adjustment on/off
(on-board computer) ...................... 217
Seat belts
Adjusting the driver's and front-
passenger seat belt ......................... 45
Cleaning ......................................... 292
Fastening ......................................... 44
Important safety guidelines ............. 42
Introduction ..................................... 42
Releasing ......................................... 44
Warning lamp ................................. 251
Warning lamp (function) ................... 45
Seats
Adjusting (electrically) ..................... 98
Adjusting (manually) ........................ 98
Adjusting the 4-way lumbar sup-
port .................................................. 99
Adjusting the head restraint ............ 98
Cleaning the cover ......................... 291
Correct driver's seat position ........... 96
Important safety notes .................... 97
Overview .......................................... 97
Seat heating problem ...................... 99
Storing settings (memory func-
tion) ............................................... 106
Switching AIRSCARF on/off .......... 100
Switching seat heating on/off ......... 99
Selector lever
Cleaning ......................................... 291
Sensors (cleaning instructions) ....... 290
Service
see ASSYST PLUS
Service Centre
see Qualified specialist workshop Service menu (on-board com-
puter)
.................................................. 212
Service products
Brake fluid ..................................... 348
Coolant (engine) ............................ 348
Engine oil ....................................... 346
Fuel ................................................ 343
Important safety notes .................. 342
Washer fluid ................................... 349
Setting the air distribution ............... 132
Setting the airflow ............................ 132
Settings
Factory (on-board computer) ......... 218
On-board compute r....................... 213
SETUP (on-board computer) ............. 219
Side lamps
Switching on/of f........................... 112
Side windows
Convenience closing ........................ 85
Important safety notes .................... 83
Opening/closing (front) ................... 84
Opening/closing all ......................... 84
Overview .......................................... 83
Problem (malfunction) ..................... 87
Resetting ......................................... 86
Sidebag ................................................ 47
Snow chains ...................................... 317
Socket
Under the armrest ......................... 269
Sockets
Centre console .............................. 269
General notes ................................ 269
Spare wheel
Storing ........................................... 335
Specialist workshop ............................ 24
Spectacles compartment ................. 265
Speed Limit Assist
Activating/deactivating the warn-ing function .................................... 211
Display message ............................ 237
Display message in the multifunc-tion display .................................... 193
Displaying ...................................... 211
Function/note s............................. 192
Important safety notes .................. 192
Speed, controlling
see Cruise control 16
Index

Protection of the environment
General notes
H
Environmental note
Daimler's declared policy is one of compre-
hensive environmental protection.
Our objectives are to use the natural resour-
ces which form the basis of our existence on
this planet sparingly and in a manner which
takes the requirements of both nature and
humanity into consideration.
You too can help to protect the environment
by operating your vehicle in an environmen-
tally-responsible manner.
Fuel consumption and the rate of engine,
transmission, brake and tyre wear depend on
the following factors:
R operating conditions of your vehicle
R your personal driving style
You can influence both factors. Therefore,
please bear the following in mind:
Operating conditions:
R avoid short trips, as these increase fuel
consumption.
R observe the correct tyre pressure.
R do not carry any unnecessary weight in the
vehicle.
R remove the roof rack once you no longer
need it.
R a regularly serviced vehicle will contribute
to environmental protection. You should
therefore adhere to the service intervals.
R all maintenance work should be carried out
at a qualified specialist workshop.
Personal driving style:
R do not depress the accelerator pedal when
starting the engine.
R do not warm up the engine when the vehicle
is stationary.
R drive carefully and maintain a safe distance
from the vehicle in front.
R avoid frequent, sudden acceleration and
braking. R
change gear in good time and use each gear
only up to Ôof its maximum engine speed.
R switch off the engine in stationary traffic.
R monitor the vehicle's fuel consumption. Returning an end-of-life vehicle
EU countries only:
Mercedes-Benz will take back your old vehicle to dispose of it in an environmentally-respon-sible manner in accordance with the Euro-
pean Union (EU) End of Life Vehicles Direc-
tive.
There is a network of return points and dis-
assembly plants available. You can return
your vehicle to these plants free of charge.
This makes a valuable contribution to the
recycling process and the conservation of
resources.
For further information on recycling old vehi- cles, recovery and the terms of the policy,
visit the Mercedes-Benz homepage. Genuine Mercedes-Benz parts
H
Environmental note
Daimler AG also supplies reconditioned
assemblies and parts which are of the same
quality as new parts. For these, the same war-
ranty applies as for new parts.
! Airbags and seat belt tensioners, as well
as control units and sensors for these
restraint systems, may be installed in the
following areas of your vehicle:
R doors
R door pillars
R door sills
R seats
R dashboard
R instrument cluster
R centre console Introduction
21 Z

Brakes
X
If ABS intervenes: continue to depress the
brake pedal with force until the braking sit-
uation is over.
X To make a full brake application:
depress the brake pedal with full force.
If ABS intervenes when braking, you will feel a pulsing in the brake pedal.
The pulsating brake pedal can be an indica-
tion of hazardous road conditions, and func-
tions as a reminder to take extra care while
driving. BAS (Brake Assist)
General notes BAS operates in emergency braking situa-
tions. If you depress the brake pedal quickly,
BAS automatically boosts the braking force,
thus shortening the stopping distance.
Important safety notes i
Observe the "Important safety notes" sec-
tion (Y page 60). G
WARNING
If BAS is malfunctioning, the braking distance
in an emergency braking situation is
increased. There is a risk of accident.
In an emergency braking situation, depress
the brake pedal with full force. ABS prevents
the wheels from locking.
Brakes X
Keep the brake pedal depressed firmly until
the emergency braking situation is over.
ABS prevents the wheels from locking.
The brakes will function as usual once you
release the brake pedal. BAS is deactivated. BAS PLUS (Brake Assist System Plus)
General notes i
Observe the "Important safety notes" sec-
tion (Y page 60).
BAS PLUS is only available on vehicles with
DISTRONIC PLUS.
For BAS PLUS to assist you, the radar sensor system must be operational.
With the aid of the radar sensor system, BAS
PLUS can detect obstacles that are in the
path of your vehicle for an extended period of
time.
If the radar sensor system is malfunctioning,
BAS PLUS will not be available. The brake
system is still available with complete brake
boosting effect and BAS.
BAS PLUS can help you to minimise the risk of a collision with a vehicle or reduce the effects
of such a collision. If BAS PLUS detects a
danger of collision, you are assisted when
braking.
Important safety notes G
WARNING
BAS PLUS cannot always clearly identify
objects and complex traffic situations.
In such cases, BAS PLUS may:
R intervene unnecessarily
R not intervene
There is a risk of an accident.
Always pay careful attention to the traffic sit- uation and be ready to brake. Terminate the
intervention in a non-critical driving situation. G
WARNING
BAS PLUS does not react:
R to people or animals
R to oncoming vehicles
R to crossing traffic
R when cornering Driving safety systems
61Safety
Z

As a result, BAS PLUS may not intervene in all
critical situations. There is a risk of an acci-
dent.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
In the event of snowfall or heavy rain, detec-
tion can be impaired.
Detection by the radar sensor system is also
impaired in the event of:
R dirt on the sensors or obscured sensors
R interference by other radar sources
R strong radar reflections, for example, in
multi-storey car parks
R a narrow vehicle travelling in front, e.g. a
motorcycle
R a vehicle travelling in front on a different
line
Following damage to the front end of the vehi-
cle, have the radar sensor settings and oper- ation checked at a qualified specialist work-
shop. This also applies to collisions at slow
speeds where there is no visible damage to
the front of the vehicle.
Function To avoid a collision, BAS PLUS calculates the
brake force necessary if:
R you approach an obstacle and
R BAS PLUS has detected a risk of collision
When driving at a speed under 30 km/h : if
you depress the brake pedal, BAS PLUS is
activated. Braking assistance from BAS PLUS
is carried out at the last possible moment.
When driving at a speed above 30 km/h : if
you depress the brake pedal sharply, BAS
PLUS automatically increases the brake pres- sure to a degree suited to the traffic situation.
BAS PLUS provides braking assistance in haz-
ardous situations with vehicles in front within
a speed range between 7 km/h and
250 km/h.
At speeds of up to approximately 70 km/h,
BAS PLUS can also detect stationary objects. Examples of stationary objects are stopped or
parked vehicles.
i If BAS PLUS demands particularly high
braking force, preventative passenger pro-
tection measures (PRE-SAFE ®
) are activa-
ted simultaneously.
X Keep the brake pedal depressed until the
emergency braking situation is over.
ABS prevents the wheels from locking.
BAS PLUS is deactivated and the brakes func-
tion as usual again, if:
R you release the brake pedal
R there is no longer a risk of collision
R no obstacle is detected in front of your
vehicle
R you depress the accelerator pedal
R you activate kickdown Adaptive brake lamps
i Observe the "Important safety notes" sec-
tion (Y page 60).
If you brake sharply from a speed of more
than 50 km/h or if braking is assisted by BAS
or BAS PLUS, the brake lamps flash rapidly. In this way, traffic travelling behind you is
warned in an even more noticeable manner.
If you brake sharply from a speed of more
than 70 km/h to a standstill, the hazard warn-
ing lamps are activated automatically. If the
brakes are applied again, the brake lamps
light up continuously. The hazard warning
lamps switch off automatically if you travel
faster than 10 km/h. You can also switch off the hazard warning lamps using the hazard
warning button (Y page 113). ESP
®
(Electronic Stability Program)
General notes i
Observe the "Important safety notes" sec-
tion (Y page 60). 62
Driving safety systemsSafety

The spinning of the wheels results in a cut-
ting action for better traction on loose sur-faces.
R traction control is still activated.
R PRE-SAFE ®
is no longer available; nor is it
activated if you brake firmly with assis-
tance from ESP ®
.
R PRE-SAFE ®
Brake is no longer available; it
is also not activated if you brake firmly with
assistance from ESP ®
.
R ESP ®
still provides support when you
brake. EBD (electronic brake force distribu-
tion)
General notes EBD monitors and controls the brake pres-
sure on the rear wheels to improve driving
stability while braking.
Important safety notes i
Observe the "Important safety notes" sec-
tion for driving safety systems (Y page 60).G
WARNING
If EBD has malfunctioned, the rear wheels can still lock, e.g. under full braking. This increa-
ses the risk of skidding and an accident.
You should therefore adapt your driving style
to the different handling characteristics. Have the brake system checked at a qualified spe-
cialist workshop.
Observe information regarding indicator and
warning lamps (Y page 252) as well as dis-
play messages (Y page 225).ADAPTIVE BRAKE
i Observe the "Important safety notes" sec-
tion (Y page 60).
ADAPTIVE BRAKE enhances braking safety
and offers increased braking comfort. In addi- tion to the braking function, ADAPTIVE BRAKE
also has the HOLD function (Y page 183) and
hill start assist (Y page 145). PRE-SAFE
®
Brake
General notes i
Observe the "Important safety notes" sec-
tion (Y page 60).
PRE-SAFE ®
Brake is only available on vehicles
with DISTRONIC PLUS.
For PRE-SAFE ®
Brake to assist you when driv-
ing, the radar sensor system must be opera-
tional.
With the help of the radar sensor system,
PRE-SAFE ®
Brake can detect obstacles that
are in front of your vehicle for an extended
period of time.
PRE-SAFE ®
Brake can help you to minimise
the risk of a collision with a vehicle ahead, and reduce the effects of such a collision. If PRE-
SAFE ®
Brake has detected a risk of collision,
you will be warned visually and acoustically as
well as by automatic braking. PRE-SAFE ®
Brake cannot prevent a collision without your intervention.
Important safety notes G
WARNING
PRE-SAFE ®
Brake will initially brake your vehi-
cle by a partial application of the brakes if a
danger of collision is detected. There may be
a collision unless you also brake. Automatic
emergency braking cannot prevent a colli-
sion. There is a risk of an accident.
Always apply the brakes yourself and try to
take evasive action. G
WARNING
PRE-SAFE ®
Brake cannot always clearly iden-
tify objects and complex traffic conditions. 66
Driving safety systemsSafety

In these cases, PRE-SAFE
®
Brake may:
R give an unnecessary warning and then
brake the vehicle
R neither give a warning nor intervene
There is a risk of an accident.
Always pay particular attention to the traffic
situation and be ready to brake, especially if
PRE-SAFE ®
Brake warns you. Terminate the
intervention in a non-critical driving situation.
In order to maintain the appropriate distance
to the vehicle in front and thus prevent a col- lision, you must apply the brakes yourself. G
WARNING
PRE-SAFE ®
Brake does not react:
R to people or animals
R to oncoming vehicles
R to crossing traffic
R when cornering
As a result, PRE-SAFE ®
Brake may neither
give warnings nor intervene in all critical sit-
uations. There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
In the event of snowfall or heavy rain, detec-
tion can be impaired.
Detection by the radar sensor system is also
impaired in the event of:
R dirt on the sensors or obscured sensors
R interference by other radar sources
R strong radar reflections, for example, in
multi-storey car parks
R a narrow vehicle travelling in front, e.g. a
motorcycle
R a vehicle travelling in front on a different
line
Following damage to the front end of the vehi-
cle, have the radar sensor settings and oper- ation checked at a qualified specialist work-
shop. This also applies to collisions at slow
speeds where there is no visible damage to
the front of the vehicle. Function X
To activate/deactivate: activate or deac-
tivate PRE-SAFE ®
Brake in the on-board
computer (Y page 211).
Vehicles with a black and white multi-
function display: when PRE-SAFE®
Brake
is activated, the Äsymbol appears in
the status overview in the multifunction
display.
Vehicles with a colour multifunction
display: when PRE-SAFE ®
Brake is deacti-
vated, the æsymbol appears in the
assistance graphic in the multifunction dis- play.
This function will issue a warning if:
R at a speed of approximately 30 km/h or
higher, the distance maintained to the vehi-
cle travelling in front is insufficient for sev-
eral seconds.
The · distance warning lamp then lights
up in the instrument cluster.
R at a speed of approximately 7 km/h or
higher, you rapidly approach a vehicle in
front.
An intermittent warning tone will then
sound and the ·distance warning lamp
will light up in the instrument cluster.
X Brake immediately to defuse the situation.
or X Take evasive action provided it is safe to do
so.
The PRE-SAFE ®
Brake function can also brake
the vehicle automatically under the following
conditions:
R the driver and front passenger have their
seat belts fastened
and
R the vehicle speed is between approx-
imately 7 km/h and 200 km/h
Up to a speed of approximately 70 km/h,
PRE-SAFE ®
Brake can also detect stationary
objects. Examples of stationary objects are
stopped or parked vehicles. Driving safety systems
67Safety Z

Useful information
i This Owner's Manual describes all mod-
els, series and optional equipment for your
vehicle that were available at the time of
going to press. National variations are pos- sible. Note that your vehicle may not be
equipped with all of the functions descri-
bed. This is also the case for systems and
functions relevant to safety.
i Read the information on qualified special-
ist workshops: (Y page 24). Key
Important safety notes
United Kingdom only: G
WARNING
When the double locks are activated, the
doors can no longer be opened from the
inside. People in the vehicle can no longer get out, e.g. in hazardous situations. There is a
risk of injury.
Therefore, do not leave any people unsuper-
vised in the vehicle, particularly children, eld-
erly people or people in need of special assis-
tance. Do not activate the double lock when
people are in the vehicle.
If the vehicle has been locked from the out-
side, the double lock function is activated as
standard. It is then not possible to open the
doors from inside the vehicle. You can deac-
tivate the double lock function by deactivat-
ing the interior motion sensor (Y page 69).
The doors can then be opened from the inside after the vehicle has been locked from the
outside. The anti-theft alarm system is trig-
gered if the door is opened from the inside.
Switch off the alarm (Y page 68).
All countries: G
WARNING
If children are left unsupervised in the vehicle, they could:
R open doors, thereby endangering other per-
sons or road users
R get out and be struck by oncoming traffic
R operate vehicle equipment and become
trapped, for example
In addition, the children could also set the
vehicle in motion, for example, if they:
R release the parking brake
R shift the automatic transmission out of park
position P or shift manual transmission into
neutral
R start the engine
There is a risk of an accident and injury.
When leaving the vehicle, always take the key with you and lock the vehicle. Never leave
children and animals unattended in the vehi-
cle. Keep the keys out of the reach of children. G
WARNING
If you attach heavy or large objects to the key, the key could be unintentionally turned in the
ignition lock. This could cause the engine to
be switched off. There is a risk of an accident.
Do not attach any heavy or large objects to the
key. Remove any bulky keyrings before insert-
ing the key into the ignition lock.
! Keep the key away from strong magnetic
fields. Otherwise, the remote control func-
tion could be affected.
Strong magnetic fields can occur in the
vicinity of powerful electrical installations.
Do not keep the key: R with electronic devices, e.g. a mobile
phone or another key
R with metallic objects, e.g. coins or metal
film
R inside metallic objects, e.g. a metal case
This can affect the key's functionality. 72
KeyOpening and closing