Peugeot 405 Manual

Fuses and relays - general information
Body electrical system / Fuses and relays - general information


Fuses
1 Fuses are designed to break a circuit when a predetermined current is reached, in order to protect the components and wiring which could be damaged by excessive current flow.

Any excessive current flow will be due to a fault in the circuit, usually a short-circuit (see Section 2).

2 The main fuses are located in the fusebox, below the steering column on the driverТs side of the facia.

3 For access to the fuses, on models up to 1992, turn the two securing clips through a quarter-turn, then drop the fusebox panel down from the facia. On models from 1993, prise off the cover to expose the fusebox (see illustrations).

3.3a Release the securing clips (arrowed) . . .
3.3a Release the securing clips (arrowed) . . .

3.3b . . . and lower the fusebox panel - early models
3.3b . . . and lower the fusebox panel - early models

3.3c Removing the fusebox cover - later models
3.3c Removing the fusebox cover - later models

4 Additional fuses may be located in the fusebox on the right-hand side of the engine compartment, in front of the suspension strut, and/or at the front left-hand corner of the engine compartment (see illustration).

3.4 Fusebox location on right-hand side of engine compartment
3.4 Fusebox location on right-hand side of engine compartment

5 A blown fuse can be recognised from its melted or broken wire.

6 To remove a fuse, first ensure that the relevant circuit is switched off.

7 Using the plastic tool provided in the fusebox, pull the fuse from its location (see illustration).

3.7 Removing a fuse using the plastic tool
3.7 Removing a fuse using the plastic tool

8 Spare fuses are provided in the blank terminal positions in the fusebox.

9 Before renewing a blown fuse, trace and rectify the cause, and always use a fuse of the correct rating. Never substitute a fuse of a higher rating, or make temporary repairs using wire or metal foil; more serious damage, or even fire, could result.

10 Note that the fuses are colour-coded as follows. Refer to the wiring diagrams for details of the fuse ratings and the circuits protected.

Colour Rating
Orange 5A
Red 10A
Blue 15A
Yellow 20A
Clear or white 25A
Green 30A
11 If desired, on models from 1993, the fusebox can be withdrawn from the facia as follows.

a) Pull off the fusebox cover.

b) Locate the red plastic clip at the left-hand side of the fusebox, and pull the clip to release (see illustration).

3.11a Pull out the securing clip . . .
3.11a Pull out the securing clip . . .

c) Slide the fusebox to the left, and then pull the assembly out from the facia (see illustration).

3.11b . . . to release the fusebox - models from 1993
3.11b . . . to release the fusebox - models from 1993

12 The following fuses are located in the engine compartment fusebox(es).

a) Cooling fan.

b) ABS.

c) Fuel pump (petrol engines).

d) Oxygen sensor (petrol engines).

e) Engine management electronic control unit (petrol engines).

Relays
13 A relay is an electrically-operated switch, which is used for the following reasons: a) A relay can switch a heavy current remotely from the circuit in which the current is flowing, allowing the use of lighter-gauge wiring and switch contacts.

b) A relay can receive more than one control input, unlike a mechanical switch.

c) A relay can have a timer function - for example, the intermittent wiper relay.

14 Most of the relays are located under the facia, behind the main fusebox, and mounted on various brackets around the steering column. The rear wiper motor relay is located in the tailgate, behind the tailgate trim panel.

On some models, additional engine-related relays are located in the relay box mounted at the front left-hand corner of the engine compartment, or in the left-hand corner of the scuttle (see illustrations).

3.14a Removing a relay from the main fusebox - models up to 1992
3.14a Removing a relay from the main fusebox - models up to 1992

3.14b Unscrewing a relay bracket securing screw from under the steering
3.14b Unscrewing a relay bracket securing screw from under the steering column - models from 1993 (viewed with steering column shrouds removed)

3.14c Main relay box located behind fusebox at rear of facia - models from
3.14c Main relay box located behind fusebox at rear of facia - models from 1993 (viewed with facia removed and inverted)

3.14d Relays in engine compartment relay box - models up to 1992
3.14d Relays in engine compartment relay box - models up to 1992

15 If a circuit or system controlled by a relay develops a fault, and the relay is suspect, operate the system. If the relay is functioning, it should be possible to hear it УclickФ as it is energised. If this is the case, the fault lies with the components or wiring of the system. If the relay is not being energised, then either the relay is not receiving a main supply or a switching voltage, or the relay itself is faulty.

Testing is by the substitution of a known good unit, but be careful - while some relays are identical in appearance and in operation, others look similar but perform different functions.

16 To remove a relay, first ensure that the relevant circuit is switched off. The relay can then simply be pulled out from the socket, and pushed back into position.


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