Cla250 fuse box diagram pdf download






















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We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may have an effect on your browsing experience. The fuse box is located under the floor near the passenger seat.

Remove the floormats. Fold out perforated floor covering 1 in the direction of the arrow. To release cover 3 , press retaining clamp 2.

Fold out cover 3 in the direction of the arrow to the catch. Remove cover 3 forwards. If, after six seconds, the driver or front-passenger seat belt has not been fastened and the doors are closed, the 7 seat belt warning lamp lights up. As soon as the driver's and frontpassenger seat belts are fastened or a front door is opened again, the 7 seat belt warning lamp goes out. If the driver's seat belt is not fastened after the engine is started, an additional warning tone will sound.

This warning tone stops after six seconds or when the driver's seat belt is fastened. A warning tone also sounds with increasing intensity for 60 seconds or until the driver or front passenger have fastened their seat belts. If the driver or front passenger unfasten their seat belts during the journey, the seat belt warning is activated again. To avoid hazardous situations, always make sure that all of the vehicle's occupants: Rhave fastened their seat belts correctly, including pregnant women Rare sitting correctly and maintain the greatest possible distance to the air bags Rfollow the following instructions Always make sure that there are no objects between the air bag and the vehicle's occupants.

An air bag complements the correctly fastened seat belt. It is no substitute for the seat belt. The air bag provides additional protection in applicable accident situations. Not all air bags are deployed in an accident. The different air bag systems function independently from one another Y page However, no system available today can completely eliminate injuries and fatalities.

It is also not possible to rule out a risk of injury caused by an air bag due to the high speed at which the air bag must be deployed. Important safety notes G WARNING If you do not sit in the correct seat position, the air bag cannot protect as intended and could even cause additional injury when deployed. Always make sure that the seat is in an almost upright position. The center of the head restraint must support the head at about eye level.

RMove the driver's and front-passenger seats as far back as possible. The driver's seat position must allow the vehicle to be driven safely. ROnly hold the steering wheel on the outside. This allows the air bag to be fully deployed. RAlways lean against the backrest while driving.

Do not lean forwards or lean against the door or side window. You may otherwise be in the deployment area of the air bags. RAlways keep your feet in the footwell in front of the seat.

Do not put your feet on the dashboard, for example. Your feet may otherwise be in the deployment area of the air bag. RFor this reason, always secure persons less than 5 ft 1.

Up to this height, the seat belt cannot be worn correctly. If a child is traveling in your vehicle, also observe the following notes: RAlways secure children under 12 years of age and less than 5 ft 1. RChild restraint systems should be installed on the rear seats. ROnly secure a child in a rearward-facing child restraint system on the frontpassenger seat when the front-passenger front air bag is deactivated.

RAlways observe the instructions and safety notes on the "Occupant Classification System OCS " Y page 49 and on "Children in the vehicle" Y page 56 in addition to the child restraint system manufacturer's installation instructions. Objects in the vehicle interior may prevent an air bag from functioning correctly. Before starting your journey and to avoid risks resulting from the speed of the air bag as it deploys, make sure that: are no people, animals or objects between the vehicle occupants and an air bag.

Rthere are no objects between the seat, door and B-pillar. Rno hard objects, e. Rno accessories, such as cup holders, are attached to the vehicle within the deployment area of an air bag, e. Rno heavy, sharp-edged or fragile objects are in the pockets of your clothing. Store such objects in a suitable place. The air bags might therefore not function properly any more. Consequently, the air bags cannot protect vehicle occupants as they are designed to do.

There is an increased risk of injury. Never modify the doors or parts of the doors. Always have work on the doors or door paneling carried out at a qualified specialist workshop.

Never modify an air bag cover or affix objects to it. Modifications or work not performed correctly to the doors or door paneling, as well as damaged doors, can lead to the Driver's air bag : deploys in front of the steering wheel.

Front-passenger front air bag ; deploys in front of and above the glove box. When deployed, the front air bags offer additional head and thorax protection for the occupants in the front seats. The front-passenger front air bag will only deploy if: Rthe system, based on the OCS weight sensor readings, detects that the frontpassenger seat is occupied Y page When deployed, the side impact air bag offers additional thorax protection.

It also offers additional pelvis protection for occupants in the front seats. However, it does not protect the: Rhead Rneck Rarms Driver's knee bag : deploys under the steering column and front-passenger knee bag ; under the glove box. The driver's and frontpassenger knee bags are triggered together with the front air bags.

The driver's and front-passenger knee bags offer additional thigh, knee and lower leg protection for the occupants in the front seats. You should only use seat covers that have been approved for the respective seat by Mercedes-Benz. In the event of a side impact, the side impact air bag is deployed on the side on which the impact occurs. The side impact air bag on the frontpassenger side front deploys under the following conditions: Rthe OCS system detects that the frontpassenger seat is occupied or Rthe belt tongue is engaged in the belt buckle of the front-passenger seat If the belt tongue is engaged in the belt buckle, the side impact air bag on the frontpassenger side deploys if an appropriate accident situation occurs.

In this case, deployment is independent of whether the frontpassenger seat is occupied or not. Window curtain air bags Window curtain air bags : are 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 curtain 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 Depending on that result, the frontpassenger front air bag and front-passenger knee bag are either enabled or deactivated. The system does not deactivate: the child restraint system. Never place objects under or behind the child restraint system, e.

The entire base of the child restraint system must always rest on the seat cushion of the front-passenger seat. The backrest of the forward-facing child restraint system must lie as flat as possible against the backrest of the front-passenger seat.

The child restraint system must not touch the roof or be subjected to a load by the head restraint. Adjust the angle of the seat backrest and the head restraint position accordingly. Only then can OCS be guaranteed to function correctly. Always observe the child restraint system manufacturer's installation instructions. Operation of Occupant Classification System OCS Rthe side impact air bag window curtain air bag Rthe Emergency Tensioning Devices Rthe Prerequisites To be classified correctly, the front passenger must sit: Rwith the seat belt fastened correctly an almost upright position with their back against the seat backrest Rwith their feet resting on the floor, if possible If the front passenger does not observe these conditions, OCS may produce a false classification, e.

The system carries out self-diagnostics. If the status of the front-passenger front air bag changes while the vehicle is in motion, an air bag display message appears in the instrument cluster Y page Be aware of the status of the front-passenger front air bag both before and during the journey.

It will not be deployed in the event of an accident and cannot perform its intended protective function. A person in the frontpassenger seat could then, for example, come into contact with the vehicle's interior, especially if the person is sitting too close to the dashboard.

When the front-passenger seat is occupied, always ensure that: Rthe classification of the person in the front- passenger seat is correct and the frontpassenger front air bag is enabled or disabled in accordance with the person in the front-passenger seat Rthe front-passenger seat has been moved back as far back as possible.

Rthe person is seated correctly. Make sure, both before and during the journey, that the status of the front-passenger front air bag is correct. The child could be struck by the air bag. Make sure that the front-passenger front air bag has been disabled. Move the front-passenger seat as far back as possible. Always make sure that the shoulder belt strap is correctly routed from the vehicle belt outlet to the shoulder belt guide on the child restraint system.

The shoulder belt strap must be routed forwards and downwards from the vehicle belt outlet. If necessary, adjust the vehicle belt outlet and the frontpassenger seat accordingly. This indicates that the frontpassenger front air bag is deactivated. This indicates that the front-passenger front air bag is deactivated. This indicates that the front-passenger front air bag is activated. The result of the classification is dependent on, among other factors, the child restraint system and the child's stature.

It is recommended that you install the child restraint system on a suitable rear seat. Rthe front-passenger seat is occupied by a person of smaller stature e. Alternatively, a person of smaller stature can sit on a rear seat. If children are traveling in the vehicle, be sure to observe the notes on "Children in the vehicle" Y page The front-passenger front air bag is deactivated in this case and does not deploy during an accident.

Have the system checked by qualified technicians as soon as possible. Consult an authorized Mercedes-Benz Center. The front-passenger seat should only be repaired at an authorized Mercedes-Benz Center. If the front-passenger seat, the seat cover or the seat cushion is damaged, have the necessary repair work carried out at an authorized Mercedes-Benz Center. For safety reasons, Mercedes-Benz recommends that you only use seat accessories that have been approved by Mercedes-Benz.

If the driver's air bag deploys, this does not mean that the front-passenger front air bag will also deploy. Depending on that result, the front-passenger front air bag is either enabled or deactivated. The frontpassenger front air bag might be triggered unintentionally or might not be triggered at all in the event of an accident with high deceleration. In this case the front-passenger seat may not be used.

Do not install a child restraint system on the front-passenger seat. It will not be deployed in the event of an accident. In this case, the front-passenger front air bag cannot perform its intended protective function, e.

That person could, for example, come into contact with the vehicle's interior, especially if the person is sitting too close to the dashboard. When the front-passenger seat is occupied, always ensure that: Rthe classification of the person in the front- passenger seat is correct and the frontpassenger front air bag is enabled or disabled in accordance with the person in the front-passenger seat Rthe person is seated properly with a correctly fastened seatbelt Rthe front-passenger seat has been moved back as far back as possible If the PASSENGER AIR BAG OFF indicator lamp remains lit when it should not, the frontpassenger seat may not be used.

Do not install a child restraint system on the frontpassenger seat. This could result in the front-passenger air bag not functioning as intended during an accident. Do not place any objects between the seat surface and the child restraint system. The entire base of the child restraint system must always rest on the seat cushion of the frontpassenger seat.

The backrest of the forward- facing child restraint system must, as far as possible, be resting on the backrest of the front-passenger seat. Always comply with the child restraint system manufacturer's installation instructions. The front-passenger seat is: 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.

If necessary, adjust the position of the front-passenger seat. Runoccupied X When installing the child restraint system, make sure that the Roccupied by the seat belt is tight. Do not pull the seat belt tight using the frontweight of a child up passenger seat adjustment. This could result in the seat belt and to 12 months old in a the child restraint system being pulled too tightly.

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. There is a risk of injury.

Do not touch the air bag parts. Have a deployed air bag replaced at a qualified specialist workshop as soon as possible. Have the vehicle towed to a qualified specialist workshop in order to have a deployed air bag replaced. It is important for your safety and that of your passenger to have deployed air bags replaced and to have any malfunctioning air bags repaired.

This will help to make sure the air bags continue to perform their protective function for the vehicle occupants in the event of a crash. Therefore, have pyrotechnic Emergency Tensioning Devices which have been triggered immediately replaced at a qualified specialist workshop. If Emergency Tensioning Devices are triggered or air bags are deployed, you will hear a bang, and a small amount of powder may also be released.

The 6 restraint system warning lamp lights up. Only in rare cases will the bang affect your hearing. The powder that is released generally does not constitute a health hazard, but it may cause short-term breathing difficulties in people with asthma or other respiratory problems.

To avoid this, you may wish to get out of the vehicle or open the windows as soon as it is safe to do so. Air bags and pyrotechnic Emergency Tensioning Devices ETDs contain perchlorate material, which may require special handling and regard for the environment.

National guidelines must be observed during disposal. In California, see www. Method of operation During the first stage of a collision, the restraint system control unit evaluates important physical data relating to vehicle deceleration or acceleration, such as: Rduration Rdirection Rintensity Based on the evaluation of this data, the restraint system control unit triggers the Emergency Tensioning Devices during a frontal or rear collision.

An Emergency Tensioning Device can only be triggered, if: Rthe ignition is switched on Rthe components of the restraint system are operational; see "Restraint system warning lamp" Y page 41 Rthe belt tongue is engaged in the buckle on the respective front-passenger seat The Emergency Tensioning Devices in the rear compartment are triggered independently of the lock status of the seat belts. Your vehicle has two-stage front air bags. During the first deployment stage, the front air bag is filled with propellant gas to reduce the risk of injuries.

The front air bag is fully deployed with the maximum amount of propellant gas if a second deployment threshold is reached within a few milliseconds.

The activation threshold of the Emergency Tensioning Devices and the air bag are determined by evaluating the rate of vehicle deceleration or acceleration which occurs at various points in the vehicle. This process is preemptive in nature. Deployment should take place in good time at the start of the collision. The rate of vehicle deceleration or acceleration and the direction of the force are essentially determined by: Rthe distribution of forces during the collision Rthe collision angle Rthe deformation characteristics of the vehicle Rthe characteristics of the object with which the vehicle has collided Factors which can only be seen and measured after a collision has occurred do not play a decisive role in the deployment of an air bag.

Nor do they provide an indication of air bag deployment. The vehicle can be deformed considerably, without an air bag being deployed. This is the case if only parts which are relatively easily deformed are affected and the rate of decel- eration is not high. Conversely, air bags may be deployed even though the vehicle suffers only minor deformation. This is the case if, for example, very rigid vehicle parts such as longitudinal body members are hit, and sufficient deceleration occurs as a result.

If the restraint system control unit detects a side impact or if the vehicle rolls over, the applicable components of the restraint system are activated independently of each other depending on the apparent type of accident. RSide impact air bags on the side of impact, independently of the Emergency Tensioning Device and the use of the seat belt on the driver's seat and outer seats in the second row The side impact air bag on the frontpassenger side front deploys under the following conditions: - the OCS system detects that the frontpassenger seat is occupied or - the belt tongue is engaged in the belt buckle of the front-passenger seat RWindow curtain air bag on the side of impact, independently of the use of the seat belt and independently of whether the front-passenger seat is occupied REmergency Tensioning Device, if the system determines that deployment can offer additional protection in this situation RWindow curtain air bags on the driver's and front-passenger side in certain situations when the vehicle rolls over, if the system determines that deployment can offer additional protection to that provided by the seat belt i Not all air bags are deployed in an accident.

The different air bag systems work independently of each other. For this reason, Mercedes-Benz strongly advises that you install a child restraint system on a rear seat.

Children are generally better protected there. The child restraint system must be appropriate to the age, weight and size of the child Rbe sure to observe the instructions and safety notes in this section in addition to the parking brake. Rstart the engine. In addition, they may operate vehicle equipment and become trapped.

There is a risk of an accident and injury. When leaving the vehicle, always take the SmartKey with you and lock the vehicle. Never leave children unsupervised in the vehicle. Never leave children unattended in the vehicle. Children may burn themselves on these parts, particularly on the metal parts of the child restraint system. If you leave the vehicle, taking the child with you, always ensure that the child restraint system is not exposed to direct sunlight.

Protect it with a blanket, for example. If the child restraint system has been exposed to direct sunlight, let it cool down before securing the child in it. Always ensure that all vehicle occupants have their seat belts fastened correctly and are sitting properly. Particular attention must be paid to children. The special seat belt retractor is disabled and the inertia real draws in a portion of the seat belt. The seat belt cannot be immediately refastened. There is an increased risk of injury, possibly even fatal.

Stop the vehicle immediately, paying attention to road and traffic conditions. Reactivate the special seat belt retractor and secure the child restraint system properly. All seat belts except the driver's seat belt are equipped with a special seat belt retractor.

When activated, the special seat belt retractor ensures that the seat belt will not slacken once the child restraint system has been secured. Installing a child restraint system: Always comply with the child restraint system manufacturer's installation instructions. X Pull the seat belt smoothly from the belt outlet. X Engage the seat belt tongue in the belt buckle.

X Activating the special seat belt retractor: Pull the seat belt out fully and let the inertia reel retract it again. While the seat belt is retracting, you should hear a ratcheting sound. The special seat belt retractor is activated. X Push the child seat restraint system down so that the seat belt is tight and does not loosen. X Press the release button of the belt buckle, hold the belt tongue firmly and guide it back towards the belt outlet. The special seat belt retractor is deactivated.

X Child restraint system The use of seat belts and child restraint systems is required by law in: Rall 50 states U. You can obtain further information about the correct child restraint system from any authorized Mercedes-Benz Center.

The child cannot then be restrained in the event of an accident, heavy braking or sudden changes of direction. Make sure that you observe the child restraint system manufacturer's installation instrucZ Safety Observe the safety notes on the seat belt Y page 42 and the notes on correct use of seat belts Y page A booster seat may be necessary to achieve proper seat belt positioning for children over 41 lbs 18 kg until they reach a height where a three-point seat belt fits properly without a booster seat.

Please ensure, that the base of the child restraint system is always resting completely on the seat cushion. Never place objects, e. Only use child restraint systems with the original cover designed for them. Only replace damaged covers with genuine covers. G WARNING If the child restraint system is installed incorrectly or is not secured, it can come loose in the event of an accident, heavy braking or a sudden change in direction. The child restraint system could be thrown about, striking vehicle occupants.

Always install child restraint systems properly, even if they are not being used. Make sure that you observe the child restraint system manufacturer's installation instructions. You will find further information on stowing objects, luggage or loads under "Loading guidelines" Y page G WARNING Child restraint systems or their securing systems which have been damaged or subjected to a load in an accident can no longer protect as intended.

Replace child restraint systems which have been damaged or subjected to a load in an accident as soon as possible. Have the securing systems on the child restraint system checked at a qualified specialist workshop, before you install a child restraint system again. There you will also find information on deactivating the front-passenger front air bag.

All child restraint systems must meet the following standards: Rthe RU. This confirmation can also be found in the installation instructions that are included with the child restraint system. Observe the warning labels in the vehicle interior and on the child restraint system. In the event of an accident, a child might not be restrained correctly. Also secure the child restraint system with the Top Tether belt, if available. Children in the vehicle! When installing the child restraint system, make sure that the seat belt for the middle seat does not get trapped.

The seat belt could otherwise be damaged. ISOFIX is a standardized securing system for specially designed child restraint systems on the rear seats. Install the child seat according to the manufacturer's instructions. Top Tether injury even further. If the child restraint system is equipped with a Top Tether belt, this should always be used. Important safety notes G WARNING If the rear seat backrests are not locked, they could fold forwards in the event of an accident, heavy braking or sudden changes of direction.

As a result, child restraint systems cannot perform their intended protective function. Rear seat backrests that are not locked can also cause additional injuries, e. Always lock rear seat backrests after installing a Top Tether belt. Observe the lock verification indicator. Adjust the rear seat backrests so that they are in an upright position. If the rear backrest is not engaged and locked, the red lock verification indicator will be visible Y page Top Tether anchorages The Top Tether anchorage points are installed in the rear compartment behind the head restraints on the parcel shelf.

This helps reduce the risk of Z Safety Always comply with the manufacturer's installation and operating instructions for the child restraint system used.

RTop Tether belt A is not twisted. RTop Tether belt A is routed between the rear seat backrest and the cargo compartment cover if the cargo compartment cover is installed. Cover ; is raised slightly at the front. X Fold cover ; upwards. Always comply with the child restraint system manufacturer's installation instructions when doing so.

X Vehicles with adjustable head restraints: Move head restraint : upwards. X Route Top Tether belt A under head restraint : between the two head restraint bars. X Vehicles without adjustable head restraints: X Top Tether belt with one belt strap: route Top Tether belt A centrally over head restraint :.

X Hook Top Tether hook? X Tension Top Tether belt A. Vehicles with adjustable head restraints: X If necessary, move head restraint : back down again slightly. Make sure that you do not interfere with the correct routing of Top Tether belt A.

Child restraint system on the frontpassenger seat General notes Accident statistics show that children secured in the rear seats are safer than children secured in the front-passenger seat. For this reason, Mercedes-Benz strongly advises that you install the child restraint system on a rear seat.

If it is absolutely necessary to install a child restraint system on the front-passenger seat, be sure to observe the instructions and safety notes on the "Occupant Classification System OCS " Y page You can thus avoid the risks that could arise as a result of: Ran incorrectly categorized person in the front-passenger seat Rthe unintentional deactivation of the frontpassenger front air bag Rthe unsuitable positioning of the child restraint system, e.

Always observe the child restraint system manufacturer's installation and operating instructions. Forward-facing child restraint system If it is absolutely necessary to install a forward-facing child restraint system on the front-passenger seat, always move the frontpassenger seat as far back as possible.

The backrest of the child restraint system must lie as flat as possible against the backrest of the front-passenger seat. If necessary, adjust the vehicle belt outlet and the front-passenger seat accordingly. Child-proof locks Important safety notes G WARNING If children are traveling in the vehicle, they could: Ropen doors, thus endangering other people or road users Rexit the vehicle and be caught by oncoming traffic Roperate vehicle equipment and become trapped There is a risk of an accident and injury.

Make sure the new fuse you are installing has the same color and ampere rating as the old one. If you install a new fuse at it blows shortly after you install it then you could have a short or a problem with that circuit and you need to get it diagnosed.

When you replace fuses make sure your ignition is off. Fuse boxes are located in two places in the CLA. Fuses in Engine Comparment. You can get a lot of fusees for cheap on Amazon, like these ones here. Make sure to replace the fusees with the correct color and ampere rating. Make sure to replace the old fuse with a new one that has the same color and ampere rating on it.



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