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Peugeot 205. Manual - part 44

Chapter 12
Body electrical system

General

System type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12-volt negative earth

Fuses (early models)

No Circuit protected

Rating (amp)

Reverse light, cooling fan relay, tachometer (GTI) . . . . . . . . . . . . .

Accessories, indicators, fuel gauge, warning lights, heater blower
motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ignition switch, wash/wipe system, stop-lights, tachometer (non-
GTI option), radio, heated rear window, electric window relay
(option), clock illumination (GTI). . . . . . . . . . . . . . . . . . . . . . . . . . . .

Central door locking (option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cooling fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hazard warning switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cigarette lighter, clock, interior lights, glovebox illumination, radio . .

Electric front windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Heated rear window, horns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear foglight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Side/tail lights/warning light, instrument panel illumination, number
plate lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(In-line) fuel pump (GTI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air compressor and horn (1.9 GTI models) - removal and refitting  . . 21
Battery, bulbs and fuses . . . . . . . . . . . . . . . . . . . .See “Weekly checks”
Bulbs (exterior lights) - renewal  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Bulbs (interior lights) - renewal  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Central door locking system - general information  . . . . . . . . . . . . . . 19
Clock - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Dim-dip lighting system - general information  . . . . . . . . . . . . . . . . . 13
Electrical fault finding - general information  . . . . . . . . . . . . . . . . . . . 2
Front direction indicator light unit - removal and refitting  . . . . . . . . . 11
Fuses and relays - general information  . . . . . . . . . . . . . . . . . . . . . . . 3
General information and precautions  . . . . . . . . . . . . . . . . . . . . . . . . 1
Headlight beam alignment - checking and adjusting  . . . . . . . . . . . . 12
Headlight unit - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . 10

Horn - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Instrument panel - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . 5
Radio - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Speedometer cable - renewal  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Screen washer fluid level check  . . . . . . . . . . . . . .See “Weekly checks”
Switches - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Tailgate heated window - general information  . . . . . . . . . . . . . . . . . 18
Tailgate wiper motor - removal and refitting  . . . . . . . . . . . . . . . . . . . 16
Vehicle immobiliser - general information  . . . . . . . . . . . . . . . . . . . . . 23
Washer system - general information  . . . . . . . . . . . . . . . . . . . . . . . . 17
Windscreen wiper motor and linkage - removal and refitting  . . . . . . 15
Wiper arms - removal and refitting  . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiper blade check  . . . . . . . . . . . . . . . . . . . . . . . .See “Weekly checks”

12•1

Specifications

Contents

Easy, suitable for
novice with little
experience

Fairly easy, suitable
for beginner with
some experience

Fairly difficult,
suitable for competent
DIY mechanic

Difficult, suitable for
experienced DIY
mechanic

Very difficult,
suitable for expert DIY
or professional

Degrees of difficulty

Fuses (1986 to 1988 GTI and CTI models)

No Circuit protected

Rating (amp)

Reversing lights, tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Direction indicators, heater blower motor, oil pressure gauge, oil
temperature gauge, heated seats, fuel gauge, coolant temperature
gauge, low battery charge warning, oil pressure warning, brake
system warning, coolant temperature warning, low coolant
level warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Windscreen wiper/washer, stop-lights, headlight washer, radio,
accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hazard warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cigarette lighter, clock, interior lights, boot light, central door
locking, radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Horns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrically-operated windows . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear foglight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail light (RH), number plate light . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail light (LH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Instrument panel illumination, side lights . . . . . . . . . . . . . . . . . . . .

Fuel pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuses (1988 to 1989 models, except GTI and CTI)

No Circuit protected

Rating (amp)

Reversing lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Direction indicators, heater blower motor, ignition warning light . .

Fuel gauge, stop-lights, front and rear wash/wipe, tachometer,
headlight wash, radio, storage tray light, warning lights (coolant
temperature, oil pressure, coolant level, handbrake, choke) . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hazard warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cigarette lighter, clock, interior lights, boot light, central door
locking, radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Horns, heated rear window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrically-operated windows . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear fog light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail lights, number plate light . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Instrument panel illumination, side lights . . . . . . . . . . . . . . . . . . . .

Fuel pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuses (1988 to 1989 GTI and CTI models)

No Circuit protected

Rating (amp)

Reversing lights, tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Direction indicators, heater blower motor, oil pressure gauge, oil
temperature gauge, heated seats, fuel gauge, coolant temperature
gauge, low battery charge warning, oil pressure warning, brake
system warning, coolant temperature warning, low coolant level
warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front and rear wash/wipe, stop-lights, headlight washer, radio,
accessories, storage tray light, map reading light . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hazard warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cigarette lighter, clock, interior lights, boot light, central door
locking, radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Horns, heated rear window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrically-operated windows . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear foglight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail light, number plate light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Instrument panel illumination, side lights . . . . . . . . . . . . . . . . . . . .

Fuel pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12•2 Body electrical system

Fuses (1989 to 1991 - all models)

No Circuit protected

Rating (amp)

Reversing lights, tachometer, fuel gauge, warning lights (low
battery charge, coolant temperature, oil pressure, low coolant
level, brake system, choke). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Direction indicators, gauges (fuel, oil temperature, . . . . . .coolant
temperature, oil pressure), heater blower . . .motor, warning lights
(low battery charge, coolant temperature, oil pressure, low coolant
level, brake system, choke) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Map reading light, stop-lights, windscreen and tailgate wash/wipe,
tachometer, radio, glovebox light, electric windows, heated rear
window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Driving lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hazard warning lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cigarette lighter, clock, interior lights, luggage compartment light,
central locking, radio, power feed to tow bar . . . . . . . . . . . . . . . . .

Horn, heated rear window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electric windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear fog light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail lights, number plate lights . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Instrument panel illumination, side lights . . . . . . . . . . . . . . . . . . . .

Electric fuel pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuses (1991 models onward)

No Circuit protected

Rating (amp)

Direction indicators, gauges (fuel, oil temperature, coolant
temperature, oil pressure), heater blower motor, warning lights
(low battery charge, coolant temperature, oil pressure, low
coolant level, brake system, choke, ABS) . . . . . . . . . . . . . . . . . . . .

Map reading light, stop-lights, windscreen and tailgate wash/wipe,
tachometer, radio, glovebox light, heated rear window . . . . . . . . .

Driving lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hazard warning lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Clock, interior lights, luggage compartment light, central locking,
radio, power feed to tow bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Horn, heated rear window, cigarette lighter . . . . . . . . . . . . . . . . . .

Electric windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear fog lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tail lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Spare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Instrument panel illumination, side lights . . . . . . . . . . . . . . . . . . . .

Electric fuel pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuses in engine compartment

Circuit protected

Rating (amp)

ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power supply to ABS electronic control unit . . . . . . . . . . . . . . . . . . . . .

Cooling fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Oxygen sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bulbs

Wattage

Headlights:

Non-GTI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

45/40

GTI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H4 (60/55)

Front parking lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Direction indicator lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front driving light (GTI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

H3 (55)

Tail/stop-lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5/21

Reverse light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rear foglights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interior light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Number plate lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Body electrical system 12•3

12•4 Body electrical system

General information and
precautions

General information

The electrical system is of 12-volt negative

earth type. Power for the lights and all
electrical accessories is supplied by a
lead/acid battery which is charged by the
alternator.

This Chapter covers repair and service

procedures for the various electrical
components and systems generally not
associated with the engine. Information on the
battery, ignition system, alternator, and starter
motor can be found in the relevant Parts of
Chapter 5.

Precautions

Warning: Before carrying out
any work on the electrical
system, read through the
precautions given in “Safety

first!” at the beginning of this manual and
in Chapter 5.
Caution: Prior to working on any
component in the electrical system, the
battery negative lead should first be
disconnected, to prevent the possibility of
electrical short-circuits and/or fires. If a
radio/cassette player with anti-theft
security code is fitted, refer to the
information given in the reference sections
of this manual before disconnecting the
battery.

Electrical fault finding -
general information

Note: Refer to the precautions given in
“Safety first!” and in Section 1 of this Chapter
before starting work. The following tests relate
to testing of the main electrical circuits, and
should not be used to test delicate electronic
circuits, particularly where an electronic
control unit is used.

General

1 A typical electrical circuit consists of an
electrical component, any switches, relays,
motors, fuses, fusible links or circuit breakers
related to that component, and the wiring and
connectors which link the component to both
the battery and the chassis. To help to
pinpoint a problem in an electrical circuit,
wiring diagrams are included at the end of this
manual.
2 Before attempting to diagnose an electrical
fault, first study the appropriate wiring
diagram, to obtain a complete understanding
of the components included in the particular
circuit concerned. The possible sources of a
fault can be narrowed down by noting if other
components related to the circuit are
operating properly. If several components or

circuits fail at one time, the problem is likely to
be related to a shared fuse or earth
connection.
3 Electrical problems usually stem from
simple causes, such as loose or corroded
connections, a faulty earth connection, a
blown fuse, a melted fusible link, or a faulty
relay. Visually inspect the condition of all
fuses, wires and connections in a problem
circuit before testing the components. Use
the wiring diagrams to determine which
terminal connections will need to be checked
in order to pinpoint the trouble-spot.
4 The basic tools required for electrical fault-
finding include a circuit tester or voltmeter (a
12-volt bulb with a set of test leads can also
be used for certain tests); an ohmmeter (to
measure resistance and check for continuity);
a battery and set of test leads; and a jumper
wire, preferably with a circuit breaker or fuse
incorporated, which can be used to bypass
suspect wires or electrical components.
Before attempting to locate a problem with
test instruments, use the wiring diagram to
determine where to make the connections.
5 To find the source of an intermittent wiring
fault (usually due to a poor or dirty
connection, or damaged wiring insulation), a
“wiggle” test can be performed on the wiring.
This involves wiggling the wiring by hand to
see if the fault occurs as the wiring is moved.
It should be possible to narrow down the
source of the fault to a particular section of
wiring. This method of testing can be used in
conjunction with any of the tests described in
the following sub-Sections.
6 Apart from problems due to poor
connections, two basic types of fault can
occur in an electrical circuit - open-circuit, or
short-circuit.
7 Open-circuit faults are caused by a break
somewhere in the circuit, which prevents
current from flowing. An open-circuit fault will
prevent a component from working.
8 Short-circuit faults are caused by a “short”
somewhere in the circuit, which allows the
current flowing in the circuit to “escape” along
an alternative route, usually to earth. Short-
circuit faults are normally caused by a
breakdown in wiring insulation, which allows a
feed wire to touch either another wire, or an
earthed component such as the bodyshell. A
short-circuit fault will normally cause the
relevant circuit fuse to blow.

Finding an open-circuit

9 To check for an open-circuit, connect one
lead of a circuit tester or the negative lead of a
voltmeter either to the battery negative
terminal or to a known good earth.
10 Connect the other lead to a connector in
the circuit being tested, preferably nearest to
the battery or fuse. At this point, battery
voltage should be present, unless the lead
from the battery or the fuse itself is faulty
(bearing in mind that some circuits are live
only when the ignition switch is moved to a
particular position).

11 Switch on the circuit, then connect the
tester lead to the connector nearest the circuit
switch on the component side.
12 If voltage is present (indicated either by
the tester bulb lighting or a voltmeter reading,
as applicable), this means that the section of
the circuit between the relevant connector
and the switch is problem-free.
13 Continue to check the remainder of the
circuit in the same fashion.
14 When a point is reached at which no
voltage is present, the problem must lie
between that point and the previous test point
with voltage. Most problems can be traced to
a broken, corroded or loose connection.

Finding a short-circuit

15 To check for a short-circuit, first
disconnect the load(s) from the circuit (loads
are the components which draw current from
a circuit, such as bulbs, motors, heating
elements, etc).
16 Remove the relevant fuse from the circuit,
and connect a circuit tester or voltmeter to the
fuse connections.
17 Switch on the circuit, bearing in mind that
some circuits are live only when the ignition
switch is moved to a particular position.
18 If voltage is present (indicated either by
the tester bulb lighting or a voltmeter reading,
as applicable), this means that there is a
short-circuit.
19 If no voltage is present during this test,
but the fuse still blows with the load(s)
reconnected, this indicates an internal fault in
the load(s).

Finding an earth fault

20 The battery negative terminal is
connected to “earth” - the metal of the
engine/transmission and the vehicle body -
and many systems are wired so that they only
receive a positive feed, the current returning
via the metal of the car body. This means that
the component mounting and the body form
part of that circuit. Loose or corroded
mountings can therefore cause a range of
electrical faults, ranging from total failure of a
circuit, to a puzzling partial failure. In
particular, lights may shine dimly (especially
when another circuit sharing the same earth
point is in operation), motors (eg wiper motors
or the radiator cooling fan motor) may run
slowly, and the operation of one circuit may
have an apparently-unrelated effect on
another. Note that on many vehicles, earth
straps are used between certain components,
such as the engine/transmission and the
body, usually where there is no metal-to-
metal contact between components, due to
flexible rubber mountings, etc.
21 To check whether a component is
properly earthed, disconnect the battery and
connect one lead of an ohmmeter to a known
good earth point. Connect the other lead to
the wire or earth connection being tested. The
resistance reading should be zero; if not,
check the connection as follows.

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