window FORD SIERRA 1982 1.G Body Electrical System Workshop Manual

Chapter 13
Body electrical system
Anti-theft alarm - location, removal and refitting . . . . . . . . . . . . . . . .51
Auxiliary warning system components - location, testing, removal and
refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Brake lamp switch - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Central door locking components - operation, removal and refitting .50
Cigarette lighter - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Clock - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Courtesy lamp and luggage compartment lamp - renewal . . . . . . . .25
Courtesy lamp switch - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Direction indicator and hazard warning flasher switch assembly -
renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Direction indicator/hazard warning flasher relay - renewal . . . . . . . . .6
Electrical door mirror switch - removal and refitting . . . . . . . . . . . . .10
Electrical fault finding - general information . . . . . . . . . . . . . . . . . . . . .2
Electric sunroof components - removal and refitting . . . . . . . . . . . . .17
Electric window components - removal and refitting . . . . . . . . . . . . .49
Exterior lamp bulbs - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Facia panel switches - removal and refitting . . . . . . . . . . . . . . . . . . . .9
Front direction indicator lamp unit - removal and refitting . . . . . . . . .44
Front direction indicator side repeater lamp - removal and refitting . .45
Front foglamps - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . .46
Fuses and relays - location and renewal . . . . . . . . . . . . . . . . . . . . . . .3
General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . .1
Handbrake “on” warning lamp switch - renewal . . . . . . . . . . . . . . . .14
Headlamps - alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Headlamp unit - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . .41
Headlamp wiper motor - removal and refitting . . . . . . . . . . . . . . . . . .40
Horn - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Horn switch assembly - removal and refitting . . . . . . . . . . . . . . . . . .11
Ignition switch and lock barrel - removal and refitting . . . . . . . . . . . . .4
Instrument panel - removal and refitting . . . . . . . . . . . . . . . . . . . . . .20Instrument panel components - removal and refitting . . . . . . . . . . . .21
Integral heated rear window/radio aerial amplifier - removal and
refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Interior lamp bulbs - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Lighting and wash/wipe switch assembly - renewal. . . . . . . . . . . . . . .7
“Lights-on” warning module - renewal . . . . . . . . . . . . . . . . . . . . . . . .24
Loudspeakers - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . .55
Luggage compartment lamp switch - removal and refitting . . . . . . .13
Map reading lamp - removal and refitting . . . . . . . . . . . . . . . . . . . . .26
Oil pressure warning lamp switch - renewal . . . . . . . . . . . . . . . . . . . .16
Radio aerial (exterior-mounted) - removal and refitting . . . . . . . . . . .53
Radio/cassette player - removal and refitting . . . . . . . . . . . . . . . . . . .57
Radio/cassette player power amplifier - removal and refitting . . . . . .56
Rear lamp unit - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . .43
Rear number plate lamp - removal and refitting . . . . . . . . . . . . . . . . .47
Rear window washer fluid reservoir - removal and refitting . . . . . . . .39
Rear window washer pump - removal and refitting . . . . . . . . . . . . . .38
Rear window wiper motor - removal and refitting . . . . . . . . . . . . . . .37
Reversing lamp switch - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Seat heating pad - removal and refitting . . . . . . . . . . . . . . . . . . . . . .52
Speedometer cable - removal and refitting . . . . . . . . . . . . . . . . . . . .30
Trip computer components - removal and refitting . . . . . . . . . . . . . .22
Underbonnet lamp - removal, refitting and bulb renewal . . . . . . . . . .28
Washer nozzles - removal and refitting . . . . . . . . . . . . . . . . . . . . . . .33
Windscreen/headlamp washer fluid reservoir - removal and refitting . .36
Windscreen/headlamp washer pump - removal and refitting . . . . . .35
Windscreen wiper motor and linkage - removal and refitting . . . . . . .34
Wiper arms - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Wiper blades - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Wiring diagrams - general information . . . . . . . . . . . . . . . . . . . . . . . .58
13•1
Contents
13Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,
suitable for competent
DIY mechanic
Difficult,suitable for
experienced DIY
mechanicVery difficult,
suitable for expert
DIY or professional
Degrees of difficulty

Windscreen and rear window
washers
1To remove a nozzle, carefully prise it from
its location using a thin-bladed screwdriver.
Disconnect the washer hose and withdraw the
nozzle.
2To refit, reconnect the washer hose to the
nozzle, and push the nozzle into its locating
hole.
3The nozzles can be adjusted by inserting a
pin into the jet and swivelling to the required
position.
Headlamp washers
Models up to 1987
4Remove the radiator grille panel.
5Disconnect the washer hose from the
nozzle.
6Separate the upper and lower halves of the
nozzle by prising apart with a thin-bladed
screwdriver, then withdraw the nozzle halves.
7Refitting is a reversal of removal.
8The nozzles can be adjusted as described
in paragraph 3.
Models from 1987
9Disconnect the washer hose from the
nozzle on the end of the wiper arm.
10Prise the combined wiper blade mounting
and nozzle from the wiper arm using a thin-
bladed screwdriver or a pair of pliers.
11Refitting is a reversal of removal.
12Note that the nozzles are not adjustable.
Removal
1Disconnect the battery negative lead.
2Remove the wiper arms.
3Remove the windscreen cowl panel.
4Disconnect the wiring plug from the motor.
5Remove the seven securing screws, and
withdraw the mounting bracket together with
the linkage and motor (see illustration). 6Unscrew the nut securing the link arm to
the motor shaft, then remove the three
securing bolts, and withdraw the motor from
the mounting bracket.
Refitting
7Refitting is a reversal of removal.
Removal
1Where headlamp washers are fitted, a
separate pump is used. The pump(s) is/are a
push-fit in the base of the washer fluid
reservoir (see illustration).
2Disconnect the battery negative lead.
3To remove a pump, syphon out the
contents of the reservoir, then pull the pump
from its grommet.
4Disconnect the wiring plug and the washer
hose.
Refitting
5Refitting is a reversal of removal, using a
new grommet if necessary. Use a little liquid
detergent as a lubricant.
6On completion, refill the reservoir and
check for correct operation.
1Where headlamp washers are fitted, a
combined windscreen/headlamp washer fluid
reservoir is used. On models up to 1987, the
reservoir is mounted on the right-hand side of
the engine compartment. On models from
1987, the reservoir is mounted under the
right-hand front wing, but has a filler within
the engine compartment.
2Disconnect the battery negative lead.
Models up to 1987
3Syphon out the contents of the reservoir, and
disconnect the wiring plug(s) and washer hose(s).
4Remove the two or three reservoir retaining
screws, as applicable, then withdraw the
reservoir.5Refitting is a reversal of removal.
Models from 1987
6Proceed as described in paragraph 3.
7Working under the front wing, remove the
three reservoir securing screws and pull the
reservoir down slightly. On vehicles fitted with
front foglamps, the bumper must be removed.
8Withdraw the reservoir.
9Refitting is a reversal of removal.
Hatchback models
1Disconnect the battery negative lead.
2Remove the wiper arm.
3Open the tailgate; remove the trim panel.
4Unscrew the earth lead and disconnect the
wiring plug from the motor.
5Remove the three securing bolts and
withdraw the mounting bracket and motor
from the tailgate (see illustration).
6The motor can be separated from the
mounting bracket by removing the three
securing bolts.
7Refitting is a reversal of removal.
Estate models
8The procedure is as described for
Hatchback models except that the washer
hose must be disconnected from the motor
assembly, and the mounting bracket is
secured by four bolts.
The procedure is as described for the
windscreen/headlamp washer pump.
Removal
1On models from 1987, the rear window
washer circuit shares the same reservoir as
the windscreen/headlamp washers.
39Rear window washer fluid
reservoir - removal and
refitting
38Rear window washer pump -
removal and refitting
37Rear window wiper motor -
removal and refitting
36Windscreen/headlamp
washer fluid reservoir -
removal and refitting
35Windscreen/headlamp
washer pump - removal and
refitting
34Windscreen wiper motor and
linkage - removal and refitting
33Washer nozzles - removal and
refitting
13•12Body electrical system
35.1 Windscreen washer pump - models
from 198737.5 Rear window wiper motor location -
mounting bracket securing bolts arrowed34.5 Windscreen wiper motor bracket
securing screws (arrowed)

2On models up to 1987, the reservoir is
located behind the trim panel on the left-hand
side of the luggage compartment (see
illustration). To remove the reservoir proceed
as follows.
3Disconnect the battery negative lead.
4Remove the trim panel.
5Operate the washers to reduce the fluid
level in the reservoir.
6Remove the reservoir filler cap, and
disconnect the wiring plug and water hose.
7Remove the two securing screws and
withdraw the reservoir.
Refitting
8Refitting is a reversal of removal.
Note: On vehicles fitted with foglamps, the
headlamp unit must be removed when the right-
hand headlamp wiper motor is to be removed.
Removal
1Disconnect the battery negative lead.
2Disconnect the washer hose from the
nozzle on the end of the wiper arm, then
remove the wiper arm.
3Pull the washer hose and retainer from the
end of the motor shaft.
4Remove the radiator grille panel.
5Where applicable, prise the trim strip from
the bottom of the headlamp unit for access to
the wiper motor mounting bolts (see
illustrations). 6Remove the two mounting bolts, then
working under the wheel arch, slide the wiper
motor rearwards, disconnect the wiring plug
and withdraw the motor.
Refitting
7Refitting is a reversal of removal, but on
completion adjust the free length of the
washer hose between the nozzle and the
retainer on the motor shaft.
1Disconnect the battery negative lead.
2Remove the radiator grille panel.
Models up to 1987
3Disconnect the headlamp wiring plug(s)
(see illustration).4Remove the three or four headlamp
securing bolts, as applicable, and the lower
sliding clamp bracket bolt on the rear of the
headlamp, then withdraw the headlamp (see
illustrations).
5If required, the headlamp lens can be
removed by releasing the spring clips around
its edge.
6Refitting is a reversal of removal, but the
headlamp securing bolts should not be
tightened until the headlamp is aligned with
the front grille panel.
7On completion, check the headlamp
alignment.
Models from 1987
8Disconnect the headlamp wiring plug(s)
(see illustration).
9Where applicable, remove the headlamp
wiper motor.
41Headlamp unit - removal and
refitting
40Headlamp wiper motor -
removal and refitting
Body electrical system 13•13
13
40.5b . . . for access to the headlamp wiper
motor mounting bolts
41.4d . . . then withdraw the headlamp unit
- models up to 198741.4c . . . and the lower sliding clamp
bracket bolt . . .41.4b . . . the rear securing bolt . . .
41.4a Remove the upper headlamp
securing bolts (arrowed) . . .41.3 Disconnect the headlamp wiring plug
- models up to 1987
40.5a Prise the trim strip from the bottom
of the headlamp unit . . .39.2 Rear window washer fluid reservoir
location - Hatchback models up to 1987.
Securing screws arrowed

P100 models
43Pull the lamp cover from the rubber
housing to expose the bulb. The bulb is a
bayonet fitting in the bulbholder.
44Refitting is a reversal of removal.
1Disconnect the battery negative lead.
Switches
2Prise the switch from its location using a
thin-bladed screwdriver, and disconnect the
wiring plug (see illustration).
3Refitting is a reversal of removal.
Operating motors
4Remove the window regulator.
5Remove the three securing bolts, and
withdraw the motor from the regulator
assembly (see illustration).
6Refitting is a reversal of removal, but ensure
that the drive gear is correctly meshed with
the regulator.
Note:If a central locking solenoid or motor is
to be renewed due to jamming or overheating,
the central locking relay must be renewed atthe same time even if it is believed to be
working correctly. Before starting work on the
central locking system, unlock all the doors
and the tailgate/boot. Make sure that the keys
are outside the vehicle before reconnecting
the battery on completion of work.
Operation
Models up to 1987
1The central locking system is activated by
turning the key in the driver’s door lock, and
the locks are operated by solenoids.
Models from 1987
2The system is activated by turning the key
in either of the front door locks, and the locks
are operated by electric motors.
Removal and refitting
3Disconnect the battery negative lead.
Models up to 1987
Switch (driver’s door lock)
4Remove the door lock.
5Remove the two securing screws, then
withdraw the switch from the lock assembly
and disconnect the wiring plug.
6Refitting is a reversal of removal, but ensure
that the cut-out in the switch lever engages
with the lock lever (see illustration).
Solenoids (passenger and rear door locks)
7Remove the door lock (see illustration).
8Remove the two securing screws, then
disconnect the solenoid operating rod and thewiring plug and withdraw the solenoid from
the lock assembly.
9Refitting is a reversal of removal.
Solenoid (tailgate lock)
10Open the tailgate and remove the trim
panel.
11Disconnect the solenoid wiring plug and
earth lead, and the operating rod, then
remove the two securing screws and
withdraw the solenoid from the tailgate(see
illustration).
12Refitting is a reversal of removal.
Models from 1987
Motors (door locks)
13Remove the door inner trim panel.
14Remove the retaining screws and
disconnect the wiring plug and the motor
operating rod, then withdraw the motor from
the door.
15Refitting is a reversal of removal.
Motor (tailgate and boot lid locks)
16Open the tailgate/boot lid and where
applicable remove the trim panel.
17Remove the retaining screws and
disconnect the wiring plug and the motor
operating rod, then withdraw the motor from
the tailgate/boot.
18Refitting is a reversal of removal.
Models from 1990
Motors (door locking)
19On models from 1990, the door locking
motors are incorporated in the door lock units
(see illustrations).
20To remove a motor, first remove the door
lock.
50Central door locking
components - operation,
removal and refitting
49Electric window components
- removal and refitting
13•18Body electrical system
48.41 Removing a rear number plate lamp
bulb - Saloon, Hatchback and Estate
models49.5 Electric window motor securing bolts
(arrowed)
50.7 Central door locking assembly -
models up to 1987
A Solenoid
B Door ajar switch (not fitted to all models)
50.6 Driver’s door central locking switch -
models up to 1987
A Switch lever cut-out
49.2 Disconnecting the wiring plug from a
centre console-mounted electric window
switch - models from 1987
50.11 Removing a tailgate lock solenoid -
Hatchback models up to 1987

1On models fitted with an electric aerial,
disconnect the battery negative lead.
Saloon and Estate models
2Remove the right-hand side trim panel from
the luggage compartment.
3Working outside the vehicle, unscrew the
nut and remove the spacer and seal from the
base of the aerial.
4Working inside the luggage compartment,
either unscrew the aerial bracket securing
screw and slide the bracket from the aerial
tube, or pull the base of the aerial from the
rubber bush in the bracket, as applicable (see
illustration).
5Ensure that the aerial is fully retracted, then
pull it through the hole in the bodywork into
the luggage compartment (see illustration).
6The aerial lead may be a push-fit in the
base of the aerial, or may be secured by a
knurled nut. Disconnect the aerial lead and
where applicable, disconnect the wiring from
the electric motor. Note that the aerial lead
runs through the roof. If it is necessary to
renew the lead, it may prove easier to leave
the old lead in place and run a new one under
the carpet. Follow existing wiring runs where
possible.
7Refitting is a reversal of removal.
Hatchback models
8Remove the right-hand rear seat side
cushion.
9Remove the rear parcel shelf.
10On “high specification” models, lift the
seat catch release lever, push out the pin
securing the link rod to the lever and
disconnect the link rod.
11Remove the securing screws from the rear
parcel shelf support (nine screws on models
up to 1987, eight screws from 1987 onwards).
Remove the rear parcel shelf support.
12Remove the side trim panel from the
luggage compartment.
13Proceed as described in paragraphs 3 to
7 inclusive.
P100 models
14Pull off the plastic trim cover and unscrew
the aerial securing nut.
15Withdraw the aerial assembly, and
carefully prise the base seal from the roof
panel.
16The aerial lead runs across the roof panel
under the headlining, and down the right-hand
front pillar to the radio unit. Renewal is
straightforward, but the front section of the
headlining must be released for access and a
length of string should be tied to the end of
the aerial lead before removal to aid routing
when refitting.
17The aerial rod can be renewed by simply
unscrewing it from the base.
18Refitting is a reversal of removal.
1Disconnect the battery negative lead.
Saloon models
2Remove both rear seat side cushions.
3Remove the securing screws and withdraw
the rear parcel shelf.
4Make a note of the wiring connections for
use when refitting, then disconnect the wiring,
remove the two securing screws, and
withdraw the amplifier unit (see illustration).
5Refitting is a reversal of removal.
Hatchback models
6Unclip the tailgate trim panel.
7Remove the amplifier bracket securing
screws, and withdraw the amplifier through
the tailgate panel aperture (see illustration).
8Make a note of the wiring connections for
use when refitting, then disconnect the wiring
and remove the amplifier unit.
9Refitting is a reversal of removal.
Estate models
10Unclip the tailgate trim panel.
11Make a note of the wiring connections for
use when refitting, then disconnect the wiring,
remove the four securing screws, and detach
the loudspeaker/amplifier bracket assembly
from the tailgate (see illustration).
12Refitting is a reversal of removal.
1Disconnect the battery earth lead.
Facia panel-mounted speakers
Upper
2Prise the speaker grille from its four
retaining clips in the facia using a thin-bladed
screwdriver.
3Remove the four securing screws,
disconnect the wiring, and pull the
loudspeaker from the facia panel.
4Refitting is a reversal of removal.
55Loudspeakers - removal and
refitting54Integral heated rear
window/radio aerial amplifier
- removal and refitting
53Radio aerial (exterior-
mounted) - removal and
refitting
13•20Body electrical system
52.5 Seat heating pad
Thermostat (arrowed) must face foam53.5 Removing an electric aerial -
Saloon model
54.7 Integral heated rear window/radio
aerial amplifier bracket securing screws
(arrowed) - Hatchback models54.4 Integral heated rear window/radio
aerial amplifier securing screws (arrowed)
- Saloon models
53.4 Pull the base of the aerial from the
rubber bush (arrowed)

Lower
5Remove the lower facia panel.
6Remove the four securing screws,
disconnect the wiring, and pull the
loudspeaker from the facia panel.
7Refitting is a reversal of removal.
Rear parcel shelf-mounted
speakers
Saloon models
8Working in the luggage compartment,
remove the single securing screw, then lift the
loudspeaker into the passenger compartment
and disconnect the wiring. Withdraw the
loudspeaker.
9Note that it is important not to disturb the
loudspeaker mounting gasket or retainer.
10Refitting is a reversal of removal, but
ensure that the wiring does not touch the
retainer, shelf, or speaker, to prevent any
audible rattles.
Hatchback models
11Working under the parcel shelf, remove
the four securing screws, disconnect the
wiring, and withdraw the loudspeaker.
12Refitting is a reversal of removal.
Door-mounted speakers
13Remove the door inner trim panel.
14Remove the four securing screws, then
withdraw the loudspeaker from the door and
disconnect the wiring. Remove the
loudspeaker.
15Do not remove the loudspeaker from the
moulding, as the two are a sealed assembly.
16Refitting is a reversal of removal.
Tailgate-mounted speakers -
Estate models
17Remove the tailgate trim panel.
18Remove the four securing screws,
disconnect the wiring and withdraw the
loudspeaker. Note that on models with an
integral heated rear window/radio aerial, the
aerial amplifier unit is combined with one of
the loudspeaker units.19Refitting is a reversal of removal.
High frequency units
20These units are used to reproduce high
frequencies only, and incorporate an
electronic filter network which must not be
disconnected or bypassed. The units are
located in the lower facia panels.
21The removal and refitting procedure is as
described for the lower facia panel-mounted
loudspeakers earlier in this Section, but take
care not to damage the extremely fragile
speaker cones.
Removal
1Some “high specification” models are fitted
with an audio power amplifier, which is
mounted as a separate unit beneath the radio/
cassette unit. To remove the unit proceed as
follows.
2Disconnect the battery negative lead.
3Remove the two screws under the top edge
of the power amplifier unit.
4Slide the unit forwards from the facia panel,
until the wiring plugs can be disconnected.
Disconnect the wiring plugs and remove the
unit.
Refitting
5Refitting is a reversal of removal.
Standard fixing
1Disconnect the battery negative lead.
2Pull off the two control knob assemblies.
3Release the trim panel by unscrewing the
two securing nuts from the control spindles.
Remove the trim panel.4Using a hooked instrument, pull the
mounting plate securing tangs towards the
centre of the radio/cassette player, then slide
the unit forwards from the facia panel (see
illustration).
5Disconnect the wiring plugs and the aerial
lead, then remove the unit.
6Remove the plastic support bracket from
the rear of the unit, and unscrew the nuts and
washers from the control spindles to remove
the mounting plate from the front of the unit.
7Refitting is a reversal of removal.
DIN fixing
8An increasing number of radio/cassette
players have DIN standard fixings. Two
special tools, obtainable from in-car
entertainment specialists, are required for
removal.
9Disconnect the battery negative lead.
10Insert the tools into the holes in the front
of the radio/cassette player and push them
until they snap into place. Pull the tools
outwards to release the unit (see illustration).
11Pull the unit forwards and disconnect the
wiring plugs and the aerial lead. Remove the
unit from the facia panel.
12To refit the radio/cassette player,
reconnect the wiring and the aerial lead, then
simply push the unit into its bracket until the
retaining lugs snap into place.
Each wiring diagram covers a particular
system of the appropriate vehicle; as
indicated in each caption. Carefully read the
Key to each diagram before commencing
work.
58Wiring diagrams - general
information
57Radio/cassette player -
removal and refitting
56Radio/cassette player power
amplifier - removal and
refitting
Body electrical system 13•21
13
57.10 Removing a radio/cassette player
using special tools - DIN fixing57.4 Radio/cassette player securing tangs
(arrowed) viewed from the rear of the unit -
standard fixing54.11 Loudspeaker/integral heated rear
window/radio aerial amplifier bracket
securing screws (arrowed) - Estate models