Remove any existing moisture from the fuse box using a dry cloth.This could lead to you or others being injured by the wiper rods. Otherwise, the windshield wipers and the wiper rods above the cover could be set in motion. Make sure that the windshield wipers are switched off and that the SmartKey is removed from the ignition lock before you open the cover of the fuse box. Valid for engine 156: Oil cooler fan motor relay Fold cover (1) inwards until it engages.ĪMG Performance Media control unit (valid as of 1.6.12).To close: clip in cover (1) on the front of the dashboard.Pull cover (1) outwards in the direction of the arrow (2) and remove it.You could damage the dashboard or the cover. Do not use a pointed object such as a screwdriver to open the cover in the dashboard. To open: pull out cover (1) slightly at the bottom in the direction of the arrow (3).It is located on the driver’s side of the dashboard. Otherwise, components or systems could be damaged. Only use fuses that have been approved for Mercedes-Benz vehicles and which have the correct fuse rating for the system concerned.There is a risk of an accident and injury. If you manipulate or bridge a faulty fuse or if you replace it with a fuse with a higher amperage, the electric cables could be overloaded. Always replace faulty fuses with the specified new fuses having the correct amperage.Always disconnect the battery before servicing high current fuses.Before changing a fuse: secure the vehicle against rolling away, remove the SmartKey from the ignition lock, and switch off all electrical consumers.It should display the same value as when you touch the two pins together, and not ‘OL’, depending on the multimeter you’re using. Afterward, touch the two pins on both ends of the cartridge fuse. Set it to the resistance measurement setting. The light should illuminate, because if not, then the fuse has likely blown.įor a home fuse, you can use a multimeter. In most cases, a test light will do, especially if it’s a car fuse.Īssuming you already have the fuse, new or otherwise, you just need to place the tip of the test light on the fuse terminals you wish to test. This is a great skill to have, especially if you intend to replace all your fuses by yourself. Once done, you only need to position the new fuse in place using the extractor, then push it down with your finger. Use a fuse extractor to pull the blown fuse out.Alternatively, refer again to the manual. Pinpoint the one that’s connected to the component you’re having issues with. Some cars show information about which fuse serves a specific circuit behind the box’s cover.The fuse box is usually under the dashboard, though you can look near your seat or in the glove compartment as well. To be sure and to save time, refer to your car’s manual. Once you’ve remedied the problem behind your burnt fuse in your car, then you can start following these steps:
#MERCEDES 40 AMP FUSE FREE#
Feel free to consult a mechanic to know for sure. In short, blown fuses don’t necessarily mean there’s a problem with your appliance or car.
#MERCEDES 40 AMP FUSE HOW TO#
How to Replace a Blown 40 Amp Fuse?īefore buying a replacement 40 amp fuse AutoZone or other retailers offer, it’s important to pinpoint and solve the issue that caused it to blow.įor example, I’ve had a client approach me wondering why her 40 amp ignition fuse keeps blowing, and it turned out to be an issue with the relay, which had to be replaced. Such high-draw parts may be the CDI ignition, audio amplifiers, or electric fans. They both fulfill the same purpose of protecting a particular component of vehicles from the damaging effects of overloads, short circuits, and arc faults.Ī 40A fuse ideally serves a component that has that exact or nearly the same current draw. What is the 40 Amp Fuse Used for in Cars?īlade fuses and Jcase fuses normally serve cars, unlike the screw-in and cartridge varieties used in homes. A relay and a fuse are two different things the only function they share is that they’re both intended to interrupt the circuit during certain conditions. Incidentally, I don’t get why people say things like “relay fuse is blown without a multimeter” online. If you get the former a lot with a bad 40 amp fuse, you shouldn’t be surprised because, as the video, I shared above states, it’s often the result of excessive current flowing through it. Overall, what a broken fuse looks like may mirror the aftermath of a lightning strike or a clean cut on a metal strip.
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