![]() ![]() ![]() The heating conditions of the maximum occurring ambient temperature have to be checked, in particular with high rated currents of the fuses, and a strong thermal radiation of components nearby. Higher ambient temperatures (T umg) mean additional load for the fuse links. The rated current (I rat) of a fuse link should approximately correspond to the operating current of the device or assembly unit which is to be protected (in accordance with the ambient temperature and rated current-definition, which means the permitted continuous currents). DIN, ISO, JASO, partially maximum values common for Littelfuse are stated as well. The voltage drop (U N) is measured according to standards e.g. If the operating voltage is very low, the fuse link's natural resistance (voltage drop) must possibly be taken into consideration. The rated voltage (U N) of a fuse link has to be at least equal or higher than the operating voltage of the device or assembly unit which is to be protected with the fuse link. (Further the level of technology, the details of the actually valid implementation provisions, the safety-principle "human beings, animals and material assets must be protected against danger," as well as the qualification of the installed components should be taken into account - self-responsibility of the manufacturer of electrical devices.) Selection Explanations and Recommendations The following international regulations and recommendations in their currently valid version are valid for fuse links: The current flow is interrupted by the melting of the fuse wire in which the current flows. Many w220 owners have experienced this with ACC Blower Fuse f33 located in Engine Compartment Right Front Fuse and Relay Module (K40/7).Automotive Fuse Link Definition and SpecificationsĪutomotive use links are self-acting break appliances for the protection of electrical devices against unsuitable current loads. Notice double the current you get four times the power! So when you get a current increase due to a failure down stream the heat rockets up dramatically and if sufficient starts to melt plastic leading to catastrophic failure. Even a small current through the circuit will generate power and hence heat as per Power = Current squared times Resistance. Then any current passing through the circuit creates heat at the resistance. The corrosion creates a weak connection and adds resistance into the circuit. The capacitor is purely for smoothing voltage spikes to vital electronics.Ī common issue with W220 Fuses is corrosion on the Fuse Link terminals and the Fuse Box terminals. It has a high-capacity capacitor installed in it, so be careful with tools in the area. X4/10 (underneath the passenger footwell carpets) and X4/22 (trunk right).įront prefuse box X4/10 (Circuit 30 and 61 terminal block and fuse box) is located underneath the passenger footwell carpets. The 100 amp fuses are not available separately. If these are shorted, the fuse and the block that contains it must be replaced. The "pre-fuses" are not shown on the fuse diagrams. In addition, there are several large fuses, 100 amp or so, sometimes called "pre-fuses" that supply power directly from the battery via large red wires to the SAMs and the fuse boxes attached to them. The following electronic consumers are electronically fused by SAM (Signal Acquisition / Actuation Module):ĭipped beam headlamp, left/right Fog lamp, front left/right Front side light left/right Hazard warning system Main beam headlamp left/right Rear fog lamp Rear side lamp left/right Registration plate lighting Reversing lamp Trunk light Turn indicators. W220 Update model searchable, both alphabetically and numerically, fuse charts in compact printable form are available here.įile:W220 Fuse Ratings Locations and Consuming Units Version 02.pdf Electronic Fuses The fuse chart along with fuse removing tool and spare fuses are stored in tool box of the spare wheel well. Original fuse charts and fuse booklets in compact printable form are available below. The next image shows fuse box designations in right-hand drive vehicles. These images show fuse box location in left-hand drive vehicles. The fuse box is located in cabin dashboard on the passenger side (right on LHD vehicles and left on RHD vehicles). Permanently powers door control module in the rear right door. Permanently powers door control module in the rear left door. Permanently powers navigation unit in trunk. Powers door control module in the front right door.Īctivates Airmatic compressor. Powers Airmatic compressor through 'O' relay. If this fuse is blown, the gearshift will not move out of the park position. Permanently powers door control module in the front left door. Permanently powers Airmatic control module.
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