Mercedes M-Class W163

since 1997 of release

Repair and car operation

Safety locks - the general information

Various combinations of safety locks, fusible inserts and chain breakers are applied to protection of contact chains of electric equipment of the car. The main assembly block is established in an impellent compartment, one more assembly block of the relay and safety locks is located in car salon, under the dashboard.

Various combinations of safety locks, fusible inserts and the chain breakers which most part is concentrated in two assembly blocks (see are applied to protection of contact chains of electric equipment of the car. Specifications).

Each separate safety lock is used for protection of any concrete electric contour or at once several contours. The label with an ID card of placement of safety locks in the assembly block is usually glued to a cover of the last, from its internal party.

In assembly blocks the safety locks of a compact design equipped with bayonet contact plugs, and if necessary easily taken by fingers from the nests in the block are located. At refusal any of consumers of the electric power first of all always it is necessary to check a condition of the corresponding safety lock. Turn a key in the ignition lock in the situation ON and by means of a lamp sampler probe open plugs of each of safety locks. If the lamp lights up at connection to each of plugs, therefore, a safety lock as it should be. If tension takes place only from food giving, means, the safety lock fused. Let's notice also that usually the case of a safety lock is made of transparent plastic through which it is easy to define a condition of a working crossing point.

The fact of a peregoraniye of a contact crossing point of the failed safety lock easily comes to light at visual survey of its translucent case

At replacement of the fused safety lock strictly watch that the established replaceable corresponded on type left of an element. The safety locks calculated on a various nominal current physically can differ nothing from each other, without being thus interchangeable. Each of electric chains has various working parameters and needs various extent of protection therefore safety lock replacement (calculated on a certain current) not corresponding to it on parameters is fraught with the most serious consequences (up to fire emergence). Working parameters of a safety lock (a nominal current) are usually designated on its plastic case.

If the new safety lock after installation also fails at once, it is not meaningful to make its further replacement, - before it is necessary to reveal and eliminate the reason of emergence of an overload in a chain. In most cases that appears the short circuit of connecting electroconducting caused by damage of its isolation.