Ford Mondeo (petrol engines). Manual - part 52

functions of the various relays are given in the
Specifications (see illustration).
8 If 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.

9 The 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.
10 To 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.
11 Now move the wiper lever to the
intermittent wipe position, and check the
output signals by operating the same
switches.
12 The self-diagnosis function is turned off
by switching the ignition off and on again.

Removal

Ignition switch and lock barrel

1 Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
2 Remove the rubber gaiters and locking
rings, then remove the securing screws and
take off the steering column upper and lower
shrouds.
3 Insert 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).
4 The 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

5 Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
6 Remove the rubber gaiters and locking
rings, then remove the securing screws and
take off the steering column upper shroud.
7 Disconnect the multi-plug (see illustration).
8 Depress 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 door

4.3A  Depress the locking plunger . . .

4.3B  . . . and withdraw the ignition lock

barrel

4.7  Disconnecting the multi-plug from the

windscreen wiper multi-function switch

4.8A  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

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
9 Disconnect the battery negative (earth) lead
(refer to Chapter 5, Section 1).
10 Carefully prise the switch panel from the
facia, using a screwdriver against a cloth pad
to prevent damage to the facia (see
illustration).
11 Disconnect the multi-plugs and withdraw
the switch panel (see illustration).
12 Unscrew the four mounting screws, and
remove the switch from the panel.
13 Pull off the switch control knob, and
remove the blanking plug and retainer.
14 Depress the plastic tabs, and remove the
front cover and switch.

Instrument light rheostat

15 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
16 Carefully prise the light switch panel from
the facia, using a screwdriver against a cloth
pad to prevent damage to the facia.
17 Disconnect 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

18 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
19 Carefully prise the switch from the facia,
using a screwdriver against a cloth pad to
prevent damage to the facia.
20 Disconnect the multi-plug and withdraw
the switch.

Direction indicator, dipped beam and
hazard flasher multi-function switch

21 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
22 Remove the rubber gaiters and locking
rings, then remove the screws and take off the
steering column upper shroud.

23 Depress the retaining lug and withdraw
the switch assembly, then disconnect the
multi-plug (see illustration).
24 With 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.
25 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
26 Carefully pull off the padded centre of the
steering wheel which incorporates the horn
switch.
27 Disconnect the wiring and remove the
switch assembly.

Luggage compartment switch

28 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
29 With the tailgate/bootlid open, pull the
weatherstrip from the centre of the rear cross
panel.
30 Carefully prise out the trim fasteners from
the bottom corners of the rear trim, then
unscrew the retaining screws and remove the
trim panel.
31 Disconnect the wiring multi-plug, and pull
out the switch.

Electrically-operated window switch
(single)

32 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
33 Carefully prise out the switch from the
door inner trim panel, using a cloth pad to
prevent damage to the trim.
34 Disconnect the multi-plug and remove the
switch.

Electrically-operated window switch
(multiple) and isolator

35 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
36 Prise the blanking cap from inside the
inner door handle cavity, and remove the
screw.
37 Hold the inner door handle in its open
position, then remove the bezel and withdraw
it over the handle.

38 Depress the retaining lug and remove the
switch assembly, then disconnect the multi-
plug.

Electrically-operated sunroof switch
and traction control switch

39 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
40 Carefully prise out the switch with a
screwdriver, using a cloth pad to prevent
damage to the trim.
41 Disconnect the multi-plug and remove the
switch.

Handbrake-on warning switch

42 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
43 Remove the centre console as described
in Chapter 11.
44 Disconnect 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)

45 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
46 Select Neutral, then prise out the selector
indicator panel, using a cloth pad to prevent
damage to the surrounding trim.
47 Push 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 switch

4.11  Disconnecting the multi-plugs from

the light switch and rheostat

4.23  Removing the direction indicator,
dipped beam and hazard flasher multi-

function switch. Direction indicator relay

(flasher unit) is attached

Heated windscreen switch and heated
rear window switch

48 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
49 Carefully prise out the switch, using a
cloth pad to prevent damage to the trim (see
illustration).
50 Disconnect the multi-plug and remove the
switch (see illustration).

Electrically-operated seat switch and
heated seat switch

51 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
52 Carefully prise out the switch, using a
cloth pad to prevent damage to the trim.
53 Disconnect the multi-plug and remove the
switch.

Adaptive damping switch

54 Disconnect the battery negative (earth)
lead (refer to Chapter 5, Section 1).
55 Carefully prise out the switch, using a
cloth pad to prevent damage to the trim.
56 Disconnect the multi-plug and remove the
switch.

Courtesy light door switch

57 Open 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.
58 Disconnect the wire, and tie it in a loose
knot to prevent it dropping back into the 
pillar.

Refitting

59 Refitting 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)

1 Working under the bonnet, depress the
plastic clips and remove the cover from the
rear of the headlight unit (see illustration).
2 Release the spring clip and withdraw the
bulb, then disconnect the wiring lead (see
illustrations).
3 Fit 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)

4 Working under the bonnet, depress the
plastic clips and remove the cover from the
rear of the headlight unit.
5 Turn 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

switch

4.50  Disconnecting the multi-plug from

the heated rear window switch

4.57A  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

switch

5.1  Removing the cover from the rear of

the headlight

5.5  Removing the headlight (main beam)

bulbholder

6 Pull out the bulb and disconnect the wiring
lead (see illustration).
7 Fit 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

8 Working under the bonnet, depress the
plastic clips and remove the cover from the
rear of the headlight unit.
9 Pull the bulbholder from the rear of the
headlight unit (see illustration).
10 Pull the wedge-type bulb from the
bulbholder 

(see illustration).

11 Fit the new bulb using a reversal of the
removal procedure.

Front direction indicator

12 Open the bonnet. Loosen (but do not
remove) the screw located above the front
direction indicator (see illustration 7.10).
13 Withdraw the front direction indicator light
unit.
14 Rotate the bulbholder anti-clockwise, and
withdraw it from the light unit.
15 Twist the bulb anti-clockwise, and remove
it from the bulbholder (see illustration).
16 Fit 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

17 The side repeater light is held in position
by spring pressure.
18 Depending on how the light unit was
previously fitted, press it either forwards or
rearwards, and remove it from the front wing
(see illustration).
19 Turn the bulbholder anti-clockwise, and
disconnect it from the housing (see
illustration).
20 Pull the wedge-type bulb from the holder
(see illustration).
21 Fit the new bulb using a reversal of the
removal procedure.

Front foglight

22 Unscrew the cross-head screws securing

the front foglight unit to the valance, and
withdraw the light unit.
23 Prise open the plastic clips and remove
the rear cover from the light unit.
24 Release the spring clips and withdraw the
bulb, then pull off the wiring connector.
25 Fit the new bulb using a reversal of the
removal procedure.

Rear light cluster

26 With 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).
27 Press 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/bulbholder

5.20  Removing the wedge-type bulb from

the side repeater bulbholder

5.26A  Pull back the weatherstrip . . .

5.15  Removing the front direction

indicator bulb

5.18  Removing the side repeater from the

front wing

5.6  Removing the headlight (main beam)

bulb from the bulbholder

5.9  Removing the front sidelight bulb-

holder from the rear of the headlight unit

5.10  Pulling the wedge-type bulb from the

bulbholder