air condition MERCEDES-BENZ C-Class SEDAN 2015 W205 Owner's Manual

1, 2, 3 ...
12 V socket see Sockets
360° camera
Cleaning .........................................3 35
Function/notes ............................ .211
4ETS
see ETS/4ETS (Electronic Trac-
tion System)
4MATIC (permanent four-wheel
drive) ................................................. .199 A
ABS (Anti-lock Braking System) Display message ............................ 251
Function/notes ................................ 66
Important safety notes .................... 66
Warning lamp ................................. 286
Accident
Automatic measures after an acci-
dent ................................................. 59
Activating/deactivating cooling
with air dehumidification ................. 143
Active Blind Spot Assist Activating/deactivating (on-
board computer) ............................ 246
Display message ............................ 273
Function/informatio n.................... 221
Active Lane Keeping Assist
Activating/deactivating (on-
board computer) ............................ 246
Display message ............................ 272
Function/information .................... 224
Active Parking Assist
Detecting parking spaces .............. 203
Display message ............................ 273
Exiting a parking space .................. 205
Function/note s............................. 202
Important safety notes .................. 202
Parking .......................................... 204
ADAPTIVE BRAKE ................................. 74
Adaptive Brake Assist Function/note s................................ 70
Adaptive Damping System (ADS) ..... 198Adaptive Highbeam Assist
Display message ............................ 267
Function/note s............................. 127
Switching on/of f........................... 128
Additional speedometer ................... 248
Additives (engine oil) ........................ 400
AGILITY SELECT switch Automatic transmission ................. 167
Climate control (3-zone automatic
climate control )............................. 142
Climate control (dual-zone auto-
matic climate control ).................... 140
Air bags
Deployment ..................................... 56
Display message ............................ 263
Front air bag (driver, front
passenger) ....................................... 49
Important safety notes .................... 48
Introduction ..................................... 48
Knee bag .......................................... 50
PASSENGER AIR BAG indicator
lamps ............................................... 43
Side impact air bag .......................... 50
Window curtain air ba g.................... 51
Air-conditioning system
see Climate control
AIRMATIC
Display message ............................ 271
Function/note s............................. 197
AIRPANEL (cleaning instructions) .... 334
Air vents Important safety notes .................. 152
Rear ............................................... 153
Setting ........................................... 152
Setting the center air vents ........... 152
Setting the side air vents ............... 153
Alarm
ATA (Anti-Theft Alarm system )......... 76
Switching off (ATA) .......................... 76
Switching the function on/off
(ATA) ................................................ 76
Alarm system
see ATA (Anti-Theft Alarm system)
Anti-lock Braking system
see ABS (Anti-lock Braking System)
Anti-Theft Alarm system
see ATA (Anti-Theft Alarm system) 4
Index

Range of the sensors ....................
.199
Warning displa y............................. 200
PASSENGER AIR BAG
Indicator lamps ................................ 43
PASSENGER AIR BAG indicator
lamp
Problem (malfunction) ................... 263
Perfume atomizer
Operating ....................................... 150
Perfume vial ................................... 150
Problem (malfunction) ................... 152
Pets in the vehicle ............................... 65
Plastic trim (cleaning instruc-
tions) .................................................. 336
Power washers .................................. 331
Power windows see Side windows
PRE-SAFE ®
(anticipatory occupant
protection) Display message ............................ 259
Operation ......................................... 58
PRE-SAFE ®
Brake
Activating/deactivating ................. 245
Display message ............................ 259
Function/note s................................ 74
Important safety notes .................... 74
Warning lamp ................................. 293
PRE-SAFE ®
PLUS (anticipatory
occupant protection PLUS) Operation ......................................... 58
Protection against theft
ATA (Anti-Theft Alarm system) ......... 76
Immobilizer ...................................... 76
Protection of the environment
General notes .................................. 22
Pulling away
Automatic transmission ................. 160
Hill start assist ............................... 160 Q
Qualified specialist workshop ........... 26R
Radiator cover ................................... 325
Radio Selecting a station ......................... 240 Radio-wave reception/transmis-
sion in the vehicle
Declaration of conformity ................ 26
Reading lamp ..................................... 129
Rear compartment Setting the airflow ......................... 146
Setting the air vents ...................... 153
Setting the temperature ................ 145
Rear fog lamp
Switching on/of f........................... 125
Rear lamps
see Lights
Rear seat (folding the backrest for-
wards/back) ...................................... 302
Rear seats Display message ............................ 281
Rear view camera
Cleaning instructions ..................... 334
Function/note s............................. 207
Switching on/of f........................... 208
Rear-view mirror
Anti-glare (manual) ........................ 117
Dipping (automatic) ....................... 119
Rear window blind ............................ 308
Rear window defroster Problem (malfunction) ................... 149
Switching on/of f........................... 148
Recuperation display ........................ 236
Refrigerant (air-conditioning sys-
tem) Important safety notes .................. 402
Refueling
Fuel gauge ....................................... 33
Important safety notes .................. 171
Refueling process .......................... 172
see Fuel
Remote control
Garage door opener ....................... 318
Programming (garage door
opener) .......................................... 319
Replacing bulbs
General notes ................................ 130
Important safety notes .................. 130
Overview of bulb types .................. 130
Removing/replacing the cover
(front wheel arch) .......................... 131
Reporting safety defects .................... 27 Index
15

Reserve (fuel tank)
see Fuel
Reserve fuel
Display messag e............................ 270
Warning lamp ................................. 291
Residual heat (climate control) ........ 149
Restraint system Display message ............................ 260
Introduction ..................................... 42
Warning lamp ................................. 290
Warning lamp (function) ................... 43
Reversing feature
Panorama sliding sunroof .............. 102
Roller sunblind s............................. 104
Side windows ................................... 97
Sliding sunroof ............................... 102
Trunk lid ........................................... 91
Reversing lamps (display mes-
sage) ................................................... 266
Roadside Assistance (breakdown) .... 24
Roller sunblind Panorama roof with power tilt/
sliding panel .................................. 104
Rear side window s......................... 308
Rear window .................................. 308
Roller sunblinds (panorama roof
with power tilt/sliding panel)
Operating ....................................... 105
Roof carrier ........................................ 306
Roof lining and carpets (cleaning
guidelines) ......................................... 337
Roof load (maximum) ........................ 403S
Safety Children in the vehicle ..................... 59
Child restraint systems .................... 61
Occupant Classification System
(OCS) ............................................... 51
see Operating safety
Safety system
see Driving safety systems
Seat belts
Adjusting the driver's and front-
passenger seat belt ......................... 47
Adjusting the height ......................... 46 center rear-compartment sea
t......... 47
Cleaning ......................................... 337
Correct usage .................................. 45
Fastening ......................................... 46
Important safety guidelines ............. 44
Introduction ..................................... 44
Releasing ......................................... 47
Warning lamp ................................. 284
Warning lamp (function) ................... 48
Seats
Adjusting (electrically) ................... 110
Adjusting (manually and electri-
cally) .............................................. 110
Adjusting the 4-way lumbar sup-
port ................................................ 112
Adjusting the head restraint .......... 111
Cleaning the cover ......................... 337
Correct driver's seat position ........ 108
Important safety notes .................. 109
Seat heating .................................. 112
Seat heating problem .................... 114
Seat ventilation .............................. 114
Seat ventilation problem ................ 115
Storing settings (memory func-
tion) ............................................... 121
Switching seat heating on/of f....... 112
Switching seat ventilation on/of f.. 114
Selector lever
Cleaning ......................................... 336
see Automatic transmission
Sensors (cleaning instructions) ....... 334
Service menu (on-board com-
puter) .................................................. 244
Service products Brake fluid ..................................... 401
Coolant (engine) ............................ 401
Engine oil ....................................... 400
Fuel ................................................ 397
Important safety notes .................. 397
Refrigerant (air-conditioning sys-
tem) ............................................... 402
Washer fluid ................................... 402
Settings
Factory (on-board computer) ......... 249
On-board computer ....................... 244
Side impact air bag ............................. 5016
Index

Protection of the environment
General notes
H
Environmental note
Daimler's declared policy is one of compre-
hensive environmental protection.
The objectives are for the natural resources
that form the basis of our existence on this
planet to be used sparingly and in a manner
that takes the requirements of both nature
and humanity into account.
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 tire wear are affected by these factors:
R operating conditions of your vehicle
R your personal driving style
You can influence both factors. You should
bear the following in mind:
Operating conditions:
R avoid short trips as these increase fuel con-
sumption.
R always make sure that the tire pressures
are correct.
R do not carry any unnecessary weight.
R remove roof racks once you no longer need
them.
R a regularly serviced vehicle will contribute
to environmental protection. You should
therefore adhere to the service intervals.
R always have service work 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 00C3of its maximum engine speed.
R switch off the engine in stationary traffic.
R keep an eye on the vehicle's fuel consump-
tion. Environmental concerns and recom-
mendations
Wherever the operating instructions require
you to dispose of materials, first try to regen-
erate or re-use them. Observe the relevant
environmental rules and regulations when
disposing of materials. In this way you will
help to protect the environment. Genuine Mercedes-Benz parts
H
Environmental note
Daimler AG also supplies reconditioned major
assemblies and parts which are of the same
quality as new parts. They are covered by the same Limited Warranty entitlements as new
parts.
! Air bags and Emergency Tensioning Devi-
ces, as well as control units and sensors for these restraint systems, may be installed inthe following areas of your vehicle:
R doors
R door pillars
R door sills
R seats
R cockpit
R instrument cluster
R center console
Do not install accessories such as audio
systems in these areas. Do not carry out
repairs or welding. You could impair the
operating efficiency of the restraint sys-
tems.
Have aftermarket accessories installed at a qualified specialist workshop. 22
Introduction

You could jeopardize the operating safety of
your vehicle if you use parts, tires and wheels as well as accessories relevant to safety
which have not been approved by Mercedes.
This could lead to malfunctions in safety-rel-
evant systems, e.g. the brake system. Use
only genuine Mercedes-Benz parts or parts of
equal quality. Only use tires, wheels and
accessories that have been specifically
approved for your vehicle.
Genuine Mercedes-Benz parts are subject to
strict quality control. Every part has been spe- cifically developed, manufactured or selected
for and adapted to Mercedes-Benz vehicles.
Only genuine Mercedes-Benz parts should
therefore be used.
More than 300,000 different genuine
Mercedes-Benz parts are available for
Mercedes-Benz models.
All authorized Mercedes-Benz Centers main-
tain a supply of genuine Mercedes-Benz parts for necessary service and repair work. In addi-
tion, strategically located parts delivery cen-
ters provide quick and reliable parts service.
Always specify the vehicle identification num- ber (VIN) when ordering genuine Mercedes-
Benz parts (Y page 396). Operator's Manual
Vehicle equipment
This Operator's Manual describes all models
and all standard and optional equipment of
your vehicle available at the time of going to
print. Country-specific differences are possi-
ble. Bear in mind that your vehicle may not
feature all functions described here. This also applies to safety-relevant systems and func-
tions. The equipment in your vehicle may
therefore differ from that shown in the
descriptions and illustrations.
The original purchase agreement lists all sys-tems installed in your vehicle.
Should you have any questions concerning
equipment and operation, please consult an
authorized Mercedes-Benz Center. The Operator's Manual and Maintenance
Booklet are important documents and should
be kept in the vehicle. Service and vehicle operation
Warranty
The implied warranty for your vehicle applies in accordance with the warranty terms and
conditions in the Service and Warranty Infor-
mation booklet.
Your authorized Mercedes-Benz Center will
replace and repair all factory-installed parts in
accordance with the following warranty terms
and conditions:
R New Vehicle Limited Warranty
R Emission System Warranty
R Emission Performance Warranty
R California, Connecticut, Maine, Massachu-
setts, New York, Pennsylvania, Rhode
Island and Vermont Emission Control Sys-
tem Warranty
R State warranty enforcement laws (lemon
laws)
Replacement parts and accessories are cov-
ered by the Mercedes-Benz Parts and Acces- sories warranties. These are available at any
authorized Mercedes-Benz Center.
i Should you lose your Service and War-
ranty Information booklet, have an author-
ized Mercedes-Benz Center arrange for a
replacement. The new Service and War-
ranty Information booklet will be posted to you. Introduction
23 Z

Information for customers in Califor-
nia
Under California law you may be entitled to a replacement of your vehicle or a refund of thepurchase price or lease price, if after a rea-
sonable number of repair attempts
Mercedes-Benz USA, LLC and/or its author-
ized repair or service facilities fail to fix one or
more substantial defects or malfunctions in
the vehicle that are covered by its express
warranty. During the period of 18 months
from original delivery of the vehicle or the
accumulation of 18,000 miles (approximately 29,000 km) on the odometer of the vehicle,
whichever occurs first, a reasonable number
of repair attempts is presumed for a retail
buyer or lessee if one or more of the following occurs:
(1) the same substantial defect or malfunc- tion results in a condition that is likely to
cause death or serious bodily injury if the
vehicle is driven, that defect or malfunc-
tion has been subject to repair two or
more times, and you have directly noti-
fied Mercedes-Benz USA, LLC in writing
of the need for its repair,
(2) the same substantial defect or malfunc- tion of a less serious nature than cate-
gory (1) has been subject to repair four or
more times and you have directly notified us in writing of the need for its repair, or
(3) the vehicle is out of service by reason of repair of the same or different substantial
defects or malfunctions for a cumulative
total of more than 30 calendar days.
Please send your written notice to:
Mercedes-Benz USA, LLC
Customer Assistance Center
One Mercedes Drive
Montvale, NJ 07645-0350 Maintenance
The Service and Warranty Booklet describes
all the necessary maintenance work which
should be done at regular intervals.
Always have the Service and Warranty Book-
let with you when you bring the vehicle to an authorized Mercedes-Benz Center. The ser-
vice advisor will record every service for you
in the Service and Warranty Booklet. Roadside Assistance
The Mercedes-Benz Roadside Assistance
Program offers technical help in the event of a breakdown. Calls to the toll-free Roadside
Assistance Hotline are answered by our
agents 24 hours a day, 365 days a year.
1-800-FOR-MERCedes(1-800-367-6372)
(USA)
1-800-387-0100 (Canada)
For additional information, refer to the
Mercedes-Benz Roadside Assistance Pro-
gram brochure (USA) or the "Roadside Assis-
tance" section in the Service and Warranty
booklet (Canada). You will find both in your
vehicle literature portfolio. Change of address or change of own-
ership
In the event of a change of address, please
send us the "Notification of Address Change" in the Service and Guarantee booklet or sim-
ply call the Mercedes-Benz Customer Assis-
tance Center (USA) at the hotline number
1-800-FOR-MERCedes(1-800-367-6372 )or
Customer Service Center (Canada) at
1-800-387-0100. This will assist us in con-
tacting you in a timely manner should the
need arise.
If you sell your Mercedes, please leave the
entire literature in the vehicle so that it is
available to the next owner.
If you have purchased a used car, please send
us the "Notification of Used Car Purchase" in 24
Introduction

In situations like this, the body, the under-
carriage, chassis parts, wheels or tires
could be damaged without the damage
being visible. Components damaged in this way can unexpectedly fail or, in the case of
an accident, no longer withstand the strain
they are designed to.
If the underbody paneling is damaged,
combustible materials such as leaves,
grass or twigs can gather between the
underbody and the underbody paneling. If
these materials come in contact with hot
parts of the exhaust system, they can catch fire.
In such situations, have the vehicle
checked and repaired immediately at a
qualified specialist workshop. If on con-
tinuing your journey you notice that driving
safety is impaired, pull over and stop the
vehicle immediately, paying attention to
road and traffic conditions. In such cases,
visit a qualified specialist workshop. Declarations of conformity
Vehicle components which receive
and/or transmit radio waves USA:
"The wireless devices of this vehicle
comply with Part 15 of the FCC Rules. Oper-
ation is subject to the following two condi-
tions: 1) These devices may not cause harm-
ful interference, and 2) These devices must
accept any interference received, including
interference that may cause undesired oper-
ation. Changes or modifications not expressly approved by the party responsible for com-
pliance could void the user’s authority to
operate the equipment."
Canada: "The wireless devices of this vehicle
comply with Industry Canada license-exempt RSS standard(s). Operation is subject to the
following two conditions: (1) These devices
may not cause interference, and (2) These
devices must accept any interference, includ-
ing interference that may cause undesired
operation of the device." Diagnostics connection
The diagnostics connection is only intended
for the connection of diagnostic equipment at
a qualified specialist workshop. G
WARNING
If you connect equipment to the diagnostics
connection in the vehicle, it may affect the
operation of the vehicle systems. As a result, the operating safety of the vehicle could be
affected. There is a risk of an accident.
Do not connect any equipment to a diagnos-
tics connection in the vehicle. G
WARNING
Objects in the driver's footwell can restrict the pedal travel or obstruct a depressed pedal.
The operating and road safety of the vehicle is
jeopardized. There is a risk of an accident.
Make sure that all objects in the vehicle are
stowed correctly, and that they cannot enter
the driver's footwell. Install the floormats
securely and as specified in order to ensure
sufficient clearance for the pedals. Do not use loose floormats and do not place floormats on
top of one another.
! If the engine is switched off and equip-
ment on the diagnostics connection is
used, the starter battery may discharge.
Connecting equipment to the diagnostics
connection can lead to emissions monitoring information being reset, for example. This
may lead to the vehicle failing to meet the
requirements of the next emissions test dur-
ing the main inspection. Qualified specialist workshop
An authorized Mercedes-Benz Center is a
qualified specialist workshop. It has the nec-
essary specialist knowledge, tools and quali-
fications to correctly carry out the work
required on your vehicle. This is especially the case for work relevant to safety. 26
Introduction

Data stored in the vehicle
Data recording
This vehicle is capable of recording diagnostic
information relating to vehicle operation, mal- functions, and user settings. This may include
information about the performance or status
of various systems, including but not limited
to, engine, throttle, steering or brake sys-
tems, that is stored and can be read out with suitable devices, particularly when the vehi-
cle is serviced. The data obtained is used to
properly diagnose and service your vehicle or
to further optimize and develop vehicle func-
tions. COMAND/mbrace
If the vehicle is equipped with COMAND or
mbrace, additional data about the vehicle’s
operation, the use of the vehicle in certain
situations, and the location of the vehicle may be compiled through COMAND or the mbrace system.
For additional information please refer to the
COMAND User Manual and/or the mbrace
Terms and Conditions. Event data recorders
This vehicle is equipped with an event data
recorder (EDR). The main purpose of an EDR
is to record data that will assist in under-
standing how a vehicle’s systems performed
in certain crash or near crash-like situations,
such as during air bag deployment or when
hitting a road obstacle. The EDR is designed
to record data related to vehicle dynamics
and safety systems for a short period of time, typically 30 seconds or less.
The EDR in this vehicle is designed to record
such data as:
R how various systems in your vehicle are
operating
R whether or not the driver and passenger
seat belts are fastened R
how far (if at all) the driver is depressing the
accelerator and/or brake pedal and
R how fast the vehicle is traveling
This data can help provide a better under-
standing of the circumstances in which
crashes and injuries occur. NOTE: EDR data is recorded by your vehicle only if a non-trivial
crash situation occurs; no data is recorded by
the EDR under normal driving conditions and no personal data (e.g., name, gender, age,
and crash location) are recorded. However,
other parties, such as law enforcement, can
combine the EDR data with the type of per-
sonal identification data routinely acquired
during a crash investigation.
To read data recorded by an EDR, special
equipment is required, and access to the vehi-
cle or the EDR is needed. In addition to the
vehicle manufacturer, other parties that have the special equipment, such as law enforce-
ment, can read the information by accessing
the vehicle or the EDR.
EDR data may be used in civil and criminal
matters as a tool in accident reconstruction,
accident claims, and vehicle safety. Since the Crash Data Retrieval CDR tool that is used to
extract data from the EDR is commercially
available, Mercedes-Benz USA, LLC
("MBUSA") expressly disclaims any and all lia- bility arising from the extraction of this infor-
mation by unauthorized Mercedes-Benz per-
sonnel.
MBUSA will not share EDR data with others
without the consent of the vehicle owners or,
if the vehicle is leased, without the consent of
the lessee. Exceptions to this representation
include responses to subpoenas by law
enforcement; by federal, state or local gov-
ernment; in connection with or arising out of
litigation involving MBUSA or its subsidiaries
and affiliates; or, as required by law.
Warning: The EDR is a component of the
Restraint System Module. Tampering with,
altering, modifying or removing the EDR com- ponent may result in a malfunction of the
Restraint System Module and other systems. 28
Int
roduction

Window curtain air bags
Window curtain air bags
0043are integrated
into the side of the roof frame and deployed in
the area from the A-pillar to the C-pillar.
When deployed, the window curtain air bag
enhances the level of protection for the head.
However, it does not protect the chest or
arms.
In the event of a side impact, the window cur-
tain air bag is deployed on the side on which
the impact occurs.
If the system determines that they can offer
additional protection to that provided by the
seat belt, a window curtain air bag may be
deployed in other accident situations
(Y page 56). Occupant Classification System
(OCS)
Introduction The Occupant Classification System (OCS)
categorizes the person in the front-passenger
seat. Depending on that result, the front-
passenger front air bag is either enabled or
deactivated.
The system does not deactivate:
R the side impact air bag
R the window curtain air bag
R the Emergency Tensioning Devices Prerequisites To be classified correctly, the front passenger
must sit:
R with the seat belt fastened correctly
R in an almost upright position with their
back against the seat backrest
R with their feet resting on the floor, if possi-
ble
If the front passenger does not observe these
conditions, OCS may produce a false classi-
fication, e.g. because the front passenger:
R transfers their weight by supporting them-
selves on a vehicle armrest
R sits in such a way that their weight is raised
from the seat cushion
If it is absolutely necessary to install a child
restraint system on the front-passenger seat,
be sure to observe the correct positioning of
the child restraint system. Never place
objects under or behind the child restraint
system, e.g. cushions. The entire base of the
child restraint system must always rest on the
seat cushion of the front-passenger seat. The
backrest of the forwards-facing child restraint system must, as far as possible, be resting on
the backrest of the front-passenger seat.
The child restraint system must not touch the roof or be put under strain by the head
restraint. Adjust the angle of the seat back-
rest and the head restraint position accord-
ingly.
Only then can OCS be guaranteed to function
correctly. Always observe the child restraint
system manufacturer's installation instruc-
tions. Occupant safety
51Safety Z

Problems with the Occupant Classification System (OCS)
Be sure to observe the notes on "System self-test" (Y
page 54).Problem
Possible causes/consequences and
0050
0050Solutions The PASSENGER AIR
BAG OFF indicator
lamp lights up and
remains lit, even
though the front-
passenger seat is occu-
pied by an adult or a
person of a stature cor-
responding to that of an
adult. The classification of the person on the front-passenger seat is
incorrect.
X Make sure the conditions for a correct classification of the per-
son on the front-passenger seat are met (Y page 51).
X If the PASSENGER AIR BAG OFF indicator lamp remains lit, the
front-passenger seat may not be used.
X Have OCS checked as soon as possible at an authorized
Mercedes-Benz Center. The PASSENGER AIR
BAG OFF indicator
lamp does not light up
and/or does not stay
on.
The front-passenger
seat is:
R unoccupied
R occupied by the
weight of a child up
to 12 months old in a
child restraint sys-
tem OCS is malfunctioning.
X Make sure there is nothing between the seat cushion and the
child seat.
X Make sure that the entire base of the child restraint system rests
on the seat cushion of the front-passenger seat. The backrest of
the forwards-facing child restraint system must, as far as pos-
sible, be resting on the backrest of front-passenger seat. If nec- essary, adjust the position of the front-passenger seat.
X Make sure that the seat cushion length is fully retracted.
X When installing the child restraint system, make sure that the
seat belt is tight. Do not pull the seat belt tight with the front-
passenger seat adjustment. This could result in the seat belt and the child restraint system being pulled too tightly.
X Check the installation of the child restraint system.
Make sure that the head restraint does not apply a load to the
child restraint system. If necessary, adjust the head restraint
accordingly.
X Make sure that no objects are applying additional weight onto
the seat.
X If the PASSENGER AIR BAG OFF indicator lamp remains off and/
or the PASSENGER AIR BAG ON indicator lamp lights up, do not install a child restraint system on the front-passenger seat. It is
recommended that you install the restraint system on a suitable
rear seat.
X Have OCS checked as soon as possible at an authorized
Mercedes-Benz Center. Occupant safety
55Safety Z