light FORD MONDEO 1993 Service Owners Manual

Chapter 12 Body electrical system
Air bag clock spring - removal and refitting . . . . . . . . . . . . . . . . . . . 30
Air bag control module - removal and refitting . . . . . . . . . . . . . . . . . 29
Air bag unit (driver’s side) - removal and refitting . . . . . . . . . . . . . . . 28
Anti-theft alarm system - general information . . . . . . . . . . . . . . . . . . 20
Auxiliary warning system - general information and
component renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Battery - check, maintenance and charging . . . . . . . . See Chapter 1
Battery - removal and refitting . . . . . . . . . . . . . . . . . . . See Chapter 5
Bulbs (exterior lights) - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Bulbs (interior lights) - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Clock - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Compact disc player - removal and refitting . . . . . . . . . . . . . . . . . . . 25
Cruise control system - general information . . . . . . . . . . . . . . . . . . . 21
Electrical fault finding - general information . . . . . . . . . . . . . . . . . . . 2
Electrical system check . . . . . . . . . . . . . . . . . . . . . . . . See Chapter 1
Exterior light units - removal and refitting . . . . . . . . . . . . . . . . . . . . . 7
Fuses, relays and timer module - testing and renewal . . . . . . . . . . . 3
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Headlight beam alignment - checking and adjustment . . . . . . . . . . 8
Headlight levelling motor - removal and refitting . . . . . . . . . . . . . . . 9Horn - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Instrument panel - removal and refitting . . . . . . . . . . . . . . . . . . . . . . 10
Instrument panel components - removal and refitting . . . . . . . . . . . 11
Radio aerial - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Radio/cassette player - coding, removal and refitting . . . . . . . . . . . 23
Radio/cassette player power amplifier - removal and refitting . . . . . 24
Speakers - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Speedometer drive cable - removal and refitting . . . . . . . . . . . . . . . 12
Stop-light switch - removal and refitting . . . . . . . . . . . See Chapter 9
Switches - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Tailgate wiper motor assembly - removal and refitting . . . . . . . . . . . 17
TCS inhibition switch - removal and refitting . . . . . . . . See Chapter 9
Trip computer module - removal and refitting . . . . . . . . . . . . . . . . . 18
Windscreen/tailgate washer system and wiper blade
check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Chapter 1
Windscreen/tailgate washer system components - removal
and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Windscreen wiper motor and linkage - removal and refitting . . . . . . 16
Wiper arms - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Fuses (auxiliary fusebox in engine compartment)
Note:Fuse ratings and circuits are liable to change from year to year. Consult the handbook supplied with the vehicle, or consult a Ford dealer,
for specific information.
Fuse No Rating Colour Circuit(s) protected
1 80 Black . . . . . . . . . . . . . . . . . . . . . . . . . . Power supply to main fusebox
2 60 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Radiator electric cooling fans
3 60 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Diesel engine glow plugs and/or ABS braking system
4 20 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Ignition system, or ignition and daytime running lights
5 30 Light green . . . . . . . . . . . . . . . . . . . . . . Heated windscreen (left-hand side)
6 30 Light green . . . . . . . . . . . . . . . . . . . . . . Heated windscreen (right-hand side)
7 30 Light green . . . . . . . . . . . . . . . . . . . . . . ABS braking system
8 30 Light green . . . . . . . . . . . . . . . . . . . . . . Air conditioning compressor/heated seats or air conditioning
compressor/daytime running lights
9 20 Light blue . . . . . . . . . . . . . . . . . . . . . . . ECU (petrol), Cold start solenoid (Diesel)
10 20 Light blue . . . . . . . . . . . . . . . . . . . . . . . Ignition switch
11 3 Violet . . . . . . . . . . . . . . . . . . . . . . . . . . ECU memory
12 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Horn and hazard flasher warning system
13 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Oxygen sensor
14 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Fuel pump
15 10 Red . . . . . . . . . . . . . . . . . . . . . . . . . . . Dipped beam headlight (right-hand side)
16 10 Red . . . . . . . . . . . . . . . . . . . . . . . . . . . Dipped beam headlight (left-hand side)
17 10 Red . . . . . . . . . . . . . . . . . . . . . . . . . . . Main beam headlight (right-hand side)
18 10 Red . . . . . . . . . . . . . . . . . . . . . . . . . . . Main beam headlight (left-hand side)
12•1
Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,suitable
for competent DIY
mechanicDifficult,suitable for
experienced DIY
mechanicVery difficult,
suitable for expert DIY
or professional
Degrees of difficulty
Specifications Contents
12
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Fuses (main fusebox in passenger compartment)
Note:Fuse ratings and circuits are liable to change from year to year. Consult the handbook supplied with the vehicle, or consult a Ford dealer,
for specific information.
Fuse Rating Colour Circuit(s) protected
19 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Heated door mirrors
20 10 Black . . . . . . . . . . . . . . . . . . . . . . . . . . Front/rear wiper motor (circuit breaker)
21 30 Light green . . . . . . . . . . . . . . . . . . . . . . Front electric windows (only)
21 40 Orange . . . . . . . . . . . . . . . . . . . . . . . . . Front and rear electric windows
22 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . ABS module
23 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Reversing lights
24 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Stop-lights
25 20 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Central locking system/double-locking/anti-theft alarm
26 20 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . Foglights
27 15 Light blue . . . . . . . . . . . . . . . . . . . . . . . Cigar lighter
28 30 Light green . . . . . . . . . . . . . . . . . . . . . . Headlight washer system
29 30 Light green . . . . . . . . . . . . . . . . . . . . . . Heated rear window
30 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Interior lighting and auxiliary warning system
31 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Instrument panel illumination
32 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Radio
33 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Front and rear sidelights (left-hand side)
34 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Interior lighting and digital clock
35 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Front and rear sidelights (right-hand side)
36 30 Light green . . . . . . . . . . . . . . . . . . . . . . Air bag
37 30 Light green . . . . . . . . . . . . . . . . . . . . . . Heater blower
38 7.5 Brown . . . . . . . . . . . . . . . . . . . . . . . . . Adaptive damping
Relays (auxiliary fusebox in engine compartment)
Relay Colour Circuit(s) protected
R1 Green . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Daytime running lights (left-hand-drive, but not all countries) or dim-
dip lights (UK)
R2 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radiator electric cooling fan (high speed)
R3 Blue (petrol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air conditioning cut-out
R3 Brown (Diesel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air conditioning in conjunction with Diesel engine
R4 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Windscreen heater time delay
R5 Dark green (petrol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radiator electric cooling fan (low speed)
R5 Black (Diesel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radiator electric cooling fan (low speed)
R6 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starter solenoid
R7 Brown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Horns
R8 Brown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel pump
R9 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dipped beam headlights
R10 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main beam headlights
R11 Brown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ECU power supply (petrol), cold start (Diesel)
Relays (main fusebox in passenger compartment)
Relay Colour Circuit(s) protected
R12 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interior, courtesy and footwell lights
R13 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heated rear window
R14 Yellow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heater blower
R15 Green . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Windscreen wiper motor
R16 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ignition
Auxiliary relays (not in the fuseboxes)
Relay Colour Circuit(s) protected Location
R17 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diesel glow plug Battery tray
R18 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . “One-touch down” Driver’s door
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . driver’s window relay
R19 Blue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Speed control cut-off Central fuse box bracket the
below instrument panel
R20 Blue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Headlight washer system Bulb module bracket
R21 Orange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear screen wiper interval Bulb module bracket
R22 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Foglights (left-hand-drive only) Interface module bracket
R23 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Direction indicators Steering column
R24 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-theft alarm (left-hand side) Door lock module bracket
R25 White . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-theft alarm (right-hand side) Door lock module bracket
R26 Black . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heated seats Door lock module bracket
12•2 Body electrical system
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BulbsWattage Type
Headlight main beam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Halogen
Headlight dipped beam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Halogen
Foglights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Halogen
Sidelights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Wedge
Direction indicator lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Bayonet
Side repeater lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Wedge
Stop-lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Bayonet
Reversing lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Bayonet
Rear fog/tail lights (Saloon and Estate) . . . . . . . . . . . . . . . . . . . . . . . . . . 21/4 Bayonet
Rear tail light (Saloon and Hatchback) . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Bayonet
Number plate lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Festoon
Engine compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Wedge
Interior lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Festoon
Reading light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Wedge
Torque wrench settingsNm lbf ft
Windscreen wiper motor bolts:
Into old motor (see text) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6
Into new motor (see text) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9
Body electrical system 12•3
12
Warning: Before carrying out any
work on the electrical system,
read through the precautions
given in “Safety first!” at the beginning of
this manual.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 not associated with the engine.
Information on the battery, ignition system,alternator, and starter motor can be found in
Chapter 5.
All models are fitted with a driver’s air bag,
which is designed to prevent serious chest
and head injuries to the driver during an
accident. A similar bag for the front seat
passenger is also available (see illustration).
The sensor and electronic unit for the air bag
is located next to the steering column inside
the vehicle, and contains a back-up capacitor,
crash sensor, decelerometer, safety sensor,
integrated circuit and microprocessor (see
illustration). The air bag is inflated by a gas
generator, which forces the bag out of the
module cover in the centre of the steering
wheel. A “clock spring” ensures that a good
electrical connection is maintained with the air
bag at all times - as the steering wheel is
turned in each direction, the spring winds and
unwinds.
All UK models are fitted with an alarm
system incorporating a movement sensor and
ignition immobiliser. On Saloon and
Hatchback models, the alarm system horn is
located on the left-hand side of the luggage
1 General information
1.3A Air bag system components
1 Air bag module (driver’s)
2 Clock spring3 Diagnostic and sensor unit
4 Air bag indicator light5 Air bag module
(passenger’s)
1.3B Air bag sensor and electronic unit
1 Crash sensor
2 Safety sensor
3 Voltage back-up
4 Application Specific Integrated Circuit
5 Microprocessor
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compartment, but on Estate models, it is on
the right-hand side.
Some models are fitted with a headlight
levelling system, which is controlled by a knob
on the facia. On position “0”, the headlights
are in their base position, and on position “5”,
the headlights are in their maximum inclined
angle.
It should be noted that, when portions of
the electrical system are serviced, the cable
should be disconnected from the battery
negative terminal, to prevent electrical shorts
and fires.
Caution: When disconnecting the
battery for work described in the
following Sections, refer to
Chapter 5, Section 1.
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 (such as engine management systems,
anti-lock braking systems, etc), particularly
where an electronic control module is used.
Also refer to the precautions given in Chapter
5, Section 1.
General
1A 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.
2Before 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.
3Electrical 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 (refer to Section 3 for details of testing
relays). 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.
4The basic tools required for electrical fault-
finding include a circuit tester or voltmeter (a
12-volt bulb with a set of test leads can alsobe 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.
5To 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.
6Apart from problems due to poor
connections, two basic types of fault can
occur in an electrical circuit - open-circuit, or
short-circuit.
7Open-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.
8Short-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
9To 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.
10Connect 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).
11Switch on the circuit, then connect the
tester lead to the connector nearest the circuit
switch on the component side.
12If 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.
13Continue to check the remainder of the
circuit in the same fashion.
14When 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
15To 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).
16Remove the relevant fuse from the circuit,
and connect a circuit tester or voltmeter to the
fuse connections.
17Switch on the circuit, bearing in mind that
some circuits are live only when the ignition
switch is moved to a particular position.
18If voltage is present (indicated either by
the tester bulb lighting or a voltmeter reading,
as applicable), this means that there is a
short-circuit.
19If 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
20The battery negative terminal is
connected to “earth” - the metal of the
engine/transmission unit 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.
21To check whether a component is
properly earthed, disconnect the battery (refer
to Chapter 5, Section 1) 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.
22If an earth connection is thought to be
faulty, dismantle the connection, and clean
both the bodyshell and the wire terminal (or
the component earth connection mating
surface) back to bare metal. Be careful to
remove all traces of dirt and corrosion, then
use a knife to trim away any paint, so that a
clean metal-to-metal joint is made. On
reassembly, tighten the joint fasteners
securely; if a wire terminal is being refitted,
use serrated washers between the terminal
and the bodyshell, to ensure a clean and
secure connection. When the connection is
2 Electrical fault finding -
general information
12•4 Body electrical system
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remade, prevent the onset of corrosion in the
future by applying a coat of petroleum jelly or
silicone-based grease, or by spraying on (at
regular intervals) a proprietary ignition sealer
such as Holts Damp Start, or a water-
dispersant lubricant such as Holts Wet Start.
Note:It is important to note that the ignition
switch and the appropriate electrical circuit
must always be switched off before any of the
fuses (or relays) are removed and renewed. In
the event of the fuse/relay unit having to be
removed, the battery earth lead must be
disconnected. When reconnecting the battery,
reference should be made to Chapter 5.
1Fuses are designed to break a circuit when
a predetermined current is reached, in order
to protect 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). The main fusebox, which also
carries some relays, is located inside the
vehicle below the facia panel on the
passenger’s side, and is accessed by a lever
behind the glovebox (see illustration).
2A central timer module is located on the
bottom of the main fusebox. This module
contains the time control elements for the
heated rear window, interior lights and
intermittent wiper operation. The module also
activates a warning buzzer/chime when the
vehicle is left with the lights switched on, or if
a vehicle fitted with automatic transmission is
not parked in position “P”.
3The auxiliary fusebox is located on the front
left-hand side of the engine compartment,
and is accessed by unclipping and removing
the cover. The auxiliary fusebox also contains
some relays (see illustration). Each circuit is
identified by numbers on the main fusebox
and on the inside of the auxiliary fusebox
cover. Reference to the fuse chart in the
Specifications at the start of this Chapter will
indicate the circuits protected by each fuse.
Plastic tweezers are attached to the main
fusebox and to the inside face of the auxiliary
fuse and block cover, to remove and fit the
fuses and relays.
4To remove a fuse, use the tweezers
provided to pull it out of the holder. Slide the
fuse sideways from the tweezers. The wire
within the fuse is clearly visible, and it will be
broken if the fuse is blown (see illustration).
5Always renew a fuse with one of an
identical 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. The fuse rating is
stamped on top of the fuse. Never renew a
fuse more than once without tracing the
source of the trouble.
6Spare fuses of various current ratings areprovided in the cover of the auxiliary fusebox.
Note that if the vehicle is to be laid up for a
long period, fuse 34 in the main fusebox
should be removed, to prevent the ancillary
electrical components from discharging the
battery.
7Relays are electrically-operated switches,
which are used in certain circuits. The various
relays can be removed from their respective
locations by carefully pulling them from the
sockets. Each relay in the fuseboxes has a
plastic bar on its upper surface to enable the
use of the tweezers. The locations and
3 Fuses, relays and timer
module- testing and renewal
Body electrical system 12•5
12
3.4 The fuses can be checked visually to
determine if they are blown
3.1 Main fusebox layout
1 Fuse/relay removal tweezers 2 Diode 3 Multi-plug connections
3.3 Auxiliary fusebox layout
1 Fuses 1 to 3 3 Relays R2, R5 and R6 5 Relay sockets for relays R1 and R4
2 Fuses 4 to 8, 11 to 14 4 Relays R7 to R11 6 Diode
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functions of the various relays are given in the
Specifications (see illustration).
8If a component controlled by a relay
becomes inoperative and the relay is suspect,
listen to the relay as the circuit is operated. If
the relay is functioning, it should be possible
to hear it click as it is energized. If the relay
proves satisfactory, the fault lies with the
components or wiring of the system. If the
relay is not being energized, then either the
relay is not receiving a switching voltage, or
the relay itself is faulty. (Do not overlook the
relay socket terminals when tracing faults.)
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.9The central timer module located on the
bottom of the main fusebox incorporates its
own self-diagnosis function. Note that
diagnosis cannot take place if the heated rear
window is defective.
10To activate the system, press the heated
rear window button while the ignition is being
switched on, then release the button. Operate
the light switch, washer pump switch and all
of the door switches one after the other, and
check that the buzzer confirms that the input
signals are correct.
11Now move the wiper lever to the
intermittent wipe position, and check the
output signals by operating the same
switches.
12The self-diagnosis function is turned off
by switching the ignition off and on again.
Removal
Ignition switch and lock barrel
1Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
2Remove the rubber gaiters and locking
rings, then remove the securing screws and
take off the steering column upper and lower
shrouds.
3Insert the ignition key, and turn it to the
accessory position. Using a small screwdriver
or twist drill through the hole in the side of the
lock housing, depress the locking plunger and
withdraw the lock barrel (see illustrations).
4The switch may be removed from the
steering column assembly by disconnecting
the multi-plug, then using a screwdriver to
release the switch retaining tab (see
illustrations).
Windscreen wiper multi-function
switch
5Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
6Remove the rubber gaiters and locking
rings, then remove the securing screws and
take off the steering column upper shroud.
7Disconnect the multi-plug (see illustration).
8Depress the plastic tab with a screwdriver,
and lift the switch assembly from the steering
column (see illustrations).
4 Switches - removal and refitting
12•6 Body electrical system
3.7 “One-touch down” window relay in the
driver’s door4.3A Depress the locking plunger . . .4.3B . . . and withdraw the ignition lock
barrel
4.7 Disconnecting the multi-plug from the
windscreen wiper multi-function switch4.8A Depress the plastic tab with a
screwdriver . . .
4.4A Release the retaining tab . . .4.4B . . . and remove the ignition switch
4.8B . . . and remove the windscreen wiper
multi-function switch
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Main light, auxiliary foglight and rear
foglight combination switch
Note:From July 1994 a rvised main light
switch was introduced; this was fitted as
standard in production. If the revised switch is
to be fitted to a pre-July 1994 model, an
adapter lead will also be required to prevent
electrical damage ocurring. Refer to your Ford
dealer for further information
9Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
10Carefully prise the switch panel from the
facia, using a screwdriver against a cloth pad
to prevent damage to the facia (see
illustration).
11Disconnect the multi-plugs and withdraw
the switch panel (see illustration).
12Unscrew the four mounting screws, and
remove the switch from the panel.
13Pull off the switch control knob, and
remove the blanking plug and retainer.
14Depress the plastic tabs, and remove the
front cover and switch.
Instrument light rheostat
15Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
16Carefully prise the light switch panel from
the facia, using a screwdriver against a cloth
pad to prevent damage to the facia.
17Disconnect the multi-plugs from the rear
of the switch, then remove the screws and
withdraw the instrument light rheostat from
the panel.
Door mirror control switch
18Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
19Carefully prise the switch from the facia,
using a screwdriver against a cloth pad to
prevent damage to the facia.
20Disconnect the multi-plug and withdraw
the switch.
Direction indicator, dipped beam and
hazard flasher multi-function switch
21Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
22Remove the rubber gaiters and locking
rings, then remove the screws and take off the
steering column upper shroud.23Depress the retaining lug and withdraw
the switch assembly, then disconnect the
multi-plug (see illustration).
24With the switch assembly removed, pull
out the direction indicator relay if required.
Horn switch (steering wheel without
air bag)
Note:When an air bag is fitted, the horn
switch is removed with the air bag unit. Refer
to Section 28.
25Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
26Carefully pull off the padded centre of the
steering wheel which incorporates the horn
switch.
27Disconnect the wiring and remove the
switch assembly.
Luggage compartment switch
28Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
29With the tailgate/bootlid open, pull the
weatherstrip from the centre of the rear cross
panel.
30Carefully prise out the trim fasteners from
the bottom corners of the rear trim, then
unscrew the retaining screws and remove the
trim panel.
31Disconnect the wiring multi-plug, and pull
out the switch.
Electrically-operated window switch
(single)
32Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
33Carefully prise out the switch from the
door inner trim panel, using a cloth pad to
prevent damage to the trim.
34Disconnect the multi-plug and remove the
switch.
Electrically-operated window switch
(multiple) and isolator
35Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
36Prise the blanking cap from inside the
inner door handle cavity, and remove the
screw.
37Hold the inner door handle in its open
position, then remove the bezel and withdraw
it over the handle.38Depress the retaining lug and remove the
switch assembly, then disconnect the multi-
plug.
Electrically-operated sunroof switch
and traction control switch
39Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
40Carefully prise out the switch with a
screwdriver, using a cloth pad to prevent
damage to the trim.
41Disconnect the multi-plug and remove the
switch.
Handbrake-on warning switch
42Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
43Remove the centre console as described
in Chapter 11.
44Disconnect the multi-plug, then remove
the screw and withdraw the switch from the
handbrake lever mounting bracket (see
illustration).
“Economy/Sport” mode switch
(automatic transmission models)
45Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
46Select Neutral, then prise out the selector
indicator panel, using a cloth pad to prevent
damage to the surrounding trim.
47Push the switch out of the panel, and
disconnect the multi-plug.
Body electrical system 12•7
12
4.44 Disconnecting the multi-plug from
the handbrake lever
4.10 Prising out the light switch4.11 Disconnecting the multi-plugs from
the light switch and rheostat4.23 Removing the direction indicator,
dipped beam and hazard flasher multi-
function switch. Direction indicator relay
(flasher unit) is attached
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Heated windscreen switch and heated
rear window switch
48Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
49Carefully prise out the switch, using a
cloth pad to prevent damage to the trim (see
illustration).
50Disconnect the multi-plug and remove the
switch (see illustration).
Electrically-operated seat switch and
heated seat switch
51Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
52Carefully prise out the switch, using a
cloth pad to prevent damage to the trim.
53Disconnect the multi-plug and remove the
switch.
Adaptive damping switch
54Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
55Carefully prise out the switch, using a
cloth pad to prevent damage to the trim.
56Disconnect the multi-plug and remove the
switch.
Courtesy light door switch
57Open the door, then unscrew the cross-
head screw and carefully pull the switch from
the pillar (see illustrations). Take care not to
force the wire from the switch terminal,
otherwise it will be difficult to retrieve it from
the pillar.
58Disconnect the wire, and tie it in a loose
knot to prevent it dropping back into the
pillar.
Refitting
59Refitting of all switches is a reversal of the
removal procedure.
Note:Ensure that all exterior lights are
switched off before disconnecting the wiring
connectors from any exterior light bulbs. Do
not touch the glass of halogen-type bulbs
(headlights, front foglights) with the fingers; if
the glass is accidentally touched, clean it with
methylated spirit.
Headlight (dipped beam)
1Working under the bonnet, depress the
plastic clips and remove the cover from the
rear of the headlight unit (see illustration).
2Release the spring clip and withdraw the
bulb, then disconnect the wiring lead (see
illustrations).
3Fit the new bulb using a reversal of the
removal procedure. Have the headlight beam
alignment checked as described later in this
Chapter.
Headlight (main beam)
4Working under the bonnet, depress the
plastic clips and remove the cover from the
rear of the headlight unit.
5Turn the bulbholder anti-clockwise, and
remove it from the rear of the headlight unit
(see illustration).
5 Bulbs (exterior lights) -
renewal
12•8 Body electrical system
4.49 Prising out the heated rear window
switch4.50 Disconnecting the multi-plug from
the heated rear window switch4.57A Unscrew the cross-head screw . . .
5.2A Release the spring clip . . .5.2B . . . and withdraw the headlight bulb
4.57B . . . and pull out the courtesy light
switch5.1 Removing the cover from the rear of
the headlight
5.5 Removing the headlight (main beam)
bulbholder
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6Pull out the bulb and disconnect the wiring
lead (see illustration).
7Fit the new bulb using a reversal of the
removal procedure, making sure that the
bulbholder is correctly located in the headlight
unit. Have the headlight beam alignment
checked as described later in this Chapter.
Front sidelight
8Working under the bonnet, depress the
plastic clips and remove the cover from the
rear of the headlight unit.
9Pull the bulbholder from the rear of the
headlight unit (see illustration).
10Pull the wedge-type bulb from the
bulbholder (see illustration).
11Fit the new bulb using a reversal of the
removal procedure.
Front direction indicator
12Open the bonnet. Loosen (but do not
remove) the screw located above the front
direction indicator (see illustration 7.10).
13Withdraw the front direction indicator light
unit.
14Rotate the bulbholder anti-clockwise, and
withdraw it from the light unit.
15Twist the bulb anti-clockwise, and remove
it from the bulbholder (see illustration).
16Fit the new bulb using a reversal of the
removal procedure, but before refitting the
light unit, first insert the holding spring in its
bore.
Side repeaters
17The side repeater light is held in position
by spring pressure.
18Depending on how the light unit was
previously fitted, press it either forwards or
rearwards, and remove it from the front wing
(see illustration).
19Turn the bulbholder anti-clockwise, and
disconnect it from the housing (see
illustration).
20Pull the wedge-type bulb from the holder
(see illustration).
21Fit the new bulb using a reversal of the
removal procedure.
Front foglight
22Unscrew the cross-head screws securingthe front foglight unit to the valance, and
withdraw the light unit.
23Prise open the plastic clips and remove
the rear cover from the light unit.
24Release the spring clips and withdraw the
bulb, then pull off the wiring connector.
25Fit the new bulb using a reversal of the
removal procedure.
Rear light cluster
26With the tailgate or bootlid open, flip open
the trim cover to reveal the bulbholder in the
rear corner of the luggage compartment. On
Estate models, pull back the weatherstrip and
unclip the trim cover (see illustrations).
27Press the two plastic locking tabs
together, and withdraw the complete rear light
cluster (see illustrations).
Body electrical system 12•9
12
5.19 Removing the bulbholder from the
side repeater lens/bulbholder5.20 Removing the wedge-type bulb from
the side repeater bulbholder5.26A Pull back the weatherstrip . . .
5.15 Removing the front direction
indicator bulb5.18 Removing the side repeater from the
front wing
5.6 Removing the headlight (main beam)
bulb from the bulbholder5.9 Removing the front sidelight bulb-
holder from the rear of the headlight unit5.10 Pulling the wedge-type bulb from the
bulbholder
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28Depress and twist the appropriate bulb to
remove it from the bulbholder (see
illustrations).
29Fit the new bulb using a reversal of the
removal procedure. Make sure that the rear
light cluster is fully inserted.
Number plate light
30Remove the cross-head screws from the
number plate light, and remove the light unit
(see illustration).
31Release the festoon-type bulb from the
contact springs (see illustration).
32Fit the new bulb using a reversal of the
removal procedure. Make sure that the
tension of the contact springs is sufficient to
hold the bulb firmly.
12•10 Body electrical system
5.26B . . . and unclip the trim cover5.27A Pressing the two plastic locking
tabs together (Estate)
5.30 Remove the cross-head screws . . .5.31 . . . for access to the festoon-type
bulb
5.27B Removing the rear light cluster
(Estate)
5.28A Removing a bulb from the rear light
cluster bulbholder
5.27C Removing the rear light cluster
(Saloon)
5.28B Bulb positions in the rear light cluster
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