1990 BMW 5 SERIES Lock

19After adjustment, screw the stop pads in
or out to support the bonnet in its new
position (see illustration).
20The bonnet mechanism should be
lubricated periodically with grease, to prevent
sticking or jamming.
11 Bumpers-
removal and refitting
1
Removal
1Detach the bumper cover (if applicable) and
where necessary the front spoiler.
2Disconnect any wiring or other components
that would interfere with bumper removal.
3Support the bumper with a jack or axle
stand. Alternatively, have an assistant support
the bumper as the bolts are removed.
4Remove the retaining bolts and detach the
bumper.
Refitting
5Refitting is a reversal of removal. Tighten
the retaining bolts securely, then refit the
bumper cover and any other components that
were removed.
12 Door trim panel-
removal and refitting
1
Caution: If the radio in your
vehicle is equipped with an anti-
theft system, make sure you have
the correct activation code before
disconnecting the battery, Refer to the
information on page 0-7 at the front of this
manual before detaching the cable.
Note: If, after connecting the battery, the
wrong language appears on the instrument
panel display, refer to page 0-7 for the
language resetting procedure.
Removal
1Disconnect the battery negative cable.
2Remove all door trim panel retaining screws
and door pull/armrest assemblies.3On models with manual (non-electric)
windows, remove the window regulator
handle (see illustration). On models with
electric windows, prise off the control switch
assembly and unplug it.
4Disengage the trim panel-to-door retaining
clips. Work around the outer edge until the
panel is free.
5Once all of the clips are disengaged, detach
the trim panel, unplug any electrical
connectors, and remove the trim panel from
the vehicle.
6For access to the inner door, carefully peel
back the plastic water shield.
Refitting
7Prior to refitting the door trim panel, be sure
to renew any clips in the panel which may
have come out (or got broken) during the
removal procedure.
8Plug in the electrical connectors (where
applicable) and place the panel in position in
the door. Press the door panel into place until
the clips are seated, then refit the
armrest/door pulls. Refit the window regulator
handle, where applicable.
13 Door- removal, refitting and
adjustment
1
Removal
1Remove the door trim panel (see Section
12). Disconnect any electrical connectors, andpush them through the door opening so they
won’t interfere with door removal.
2Place a trolley jack or axle stand under the
door, or have an assistant on hand to support
it when the hinge bolts are removed. Note: If a
jack or axle stand is used, place a rag between
it and the door, to protect the door’s painted
surfaces.
3Scribe or mark around the door hinges.
4Disconnect the door check strap by prising
the circlip out of the end of the pin, then slide
the pin out (see illustration). A roll pin is fitted
to some models; this is removed by driving it
out with a pin punch.
5Remove the hinge-to-door nuts, and
carefully lift off the door (see illustration).
Refitting and adjustment
6Refitting is the reverse of removal.
7Following refitting of the door, check the
alignment and adjust it if necessary as
follows:
a) Up-and-down and fore-and-aft
adjustments are made by loosening the
hinge-to-body nuts and moving the door
as necessary.
b) The door lock striker can also be adjusted
both up and down and sideways, to
provide positive engagement with the lock
mechanism. This is done by loosening the
mounting bolts and moving the striker as
necessary (see illustration).
14 Boot lid/tailgate- removal,
refitting and adjustment
1
Boot lid
1Open the boot lid, and cover the edges of
the boot compartment with pads or cloths to
protect the painted surfaces when the lid is
removed.
2Disconnect any cables or electrical
connectors attached to the boot lid that would
interfere with removal.
3Make alignment marks around the hinge
bolts (see illustration).
4Have an assistant support the lid, then
remove the lid-to-hinge bolts on both sides
and lift it off.
11•6 Bodywork and fittings
13.7 The door lock striker position can be
adjusted after loosening the screws
(arrowed)13.5 Remove the nuts (arrowed) and
detach the door from the hinges
13.4 Detach the circlip (arrowed) from the
tapered end of the pin12.3 On models without electric windows,
prise off the window regulator handle trim
piece for access to the retaining screw

5Refitting is the reverse of removal. Align the
lid-to-hinge bolts with the marks made during
removal.
6After refitting, close the lid and make sure
it’s in proper alignment with the surrounding
panels. Fore-and-aft and side-to-side
adjustments are controlled by the position of
the hinge bolts in the slots. To make an
adjustment, loosen the hinge bolts, reposition
the lid, and retighten the bolts.
7The height of the lid in relation to the
surrounding body panels when closed can be
changed by loosening the lock and/or striker
bolts, repositioning the striker and/or lock,
and tightening the bolts (see illustrations).
Caution: If the radio in your
vehicle is equipped with an anti-
theft system, make sure you have
the correct activation code
before disconnecting the battery, Refer to
the information on page 0-7 at the front of
this manual before detaching the cable.
Note: If, after connecting the battery, the
wrong language appears on the instrument
panel display, refer to page 0-7 for the
language resetting procedure.
Tailgate
8Disconnect the battery negative cable.
9Open the tailgate and cover the rear edge
of the roof with pads or cloths to protect the
painted surfaces when the tailgate isremoved. On 5-Series models, the window
may be removed separately by disconnecting
the wiring and unscrewing the mounting
screws - have an assistant hold the window
while the screws are being loosened (see
illustration).
10Remove the trim from the inside of the
tailgate. Also where necessary on 5-Series
models, remove the edge covers for access to
the strut mountings.
11Disconnect the wiring loom and the
washer tubing. On some models, it will be
necessary to pull the wiring loom out of the
rear pillar and then disconnect the plug (see
illustration).
12While an assistant holds the tailgate open,disconnect the struts on both sides by
unscrewing the mounting screws. Where
applicable, pull out the retaining pin or spring
clip, and remove the strut from the ball (see
illustrations).
13Mark the position of the hinge arms on the
tailgate with a pencil.
14Unscrew the bolts and withdraw the
tailgate from the hinge arms. On 5-Series
models, it will be necessary to use an Allen
key or bit (see illustration).
15Refitting is the reverse of removal, but
make sure that the previously-made marks
are correctly aligned. Check that the tailgate
closes centrally between the rear pillars and
enters the lock correctly.
Bodywork and fittings 11•7
14.7b Adjust the boot lid lock striker after
loosening the bolts (arrowed)14.7a Loosen the lock bolts (arrowed) and
move the lock to adjust the boot lid closing
position14.3 Mark around the hinge bolts so you
can refit the boot lid in its original location
- unscrew or loosen the boot lid-to-hinge
bolts to remove or adjust it
14.12c Removing the retaining pin to
disconnect the bottom of the tailgate
support strut (5-Series)14.12b Strut mounting on the tailgate
(5-Series)14.12a Removing the tailgate strut spring
clip (3-Series)
14.11 Removing the wiring from the rear
pillar (5-Series)14.9 Tailgate window mounting screws
(5-Series)
11

15 Latch, lock cylinder and
handles- removal, refitting
and adjustment
1
1Remove the trim panel(s) and, on the door,
the plastic shield (see Section 12).
Latch
2Disconnect the operating rods from the
latch (see illustration).
3Remove the latch retaining screws.
4Detach the latch assembly and withdraw it.
5Refitting is the reverse of removal.
Lock cylinder
6Detach the linkage.
7Use a screwdriver to slide the retaining clip
off, and withdraw the lock cylinder.
8Refitting is the reverse of removal.
Interior handle
9Disconnect the operating rod from the
handle.
10Remove the retaining screws and lift the
handle from the door.
11Refitting is the reverse of removal.
Exterior handle
12Lift up the handle for access, remove the
two retaining screws, then detach the handle
from the door.
13Refitting is the reverse of removal.
16 Door window glass-
removal and refitting
3
Caution: If the radio in your
vehicle is equipped with an anti-
theft system, make sure you have
the correct activation code
before disconnecting the battery, Refer to
the information on page 0-7 at the front of
this manual before detaching the cable.
Note: If, after connecting the battery, the
wrong language appears on the instrument
panel display, refer to page 0-7 for the
language resetting procedure.
1Disconnect the battery negative cable.
2Remove the door trim panel and the plastic
water shield (see Section 12).
3Prise the door inner and outer weatherstrips
from the door.
Front door
4Raise the window so that the mounting
bolts can be reached through the access hole.
If electric windows are fitted, temporarily
reconnect the battery cable to accomplish
this.
5Support the glass, and remove the retaining
bolts securing the glass to the regulator.
6Lift the window glass up and out of the door
window slot, then tilt it and remove it from the
door.
7Refitting is the reverse of removal.
Rear door
8Carry out the operations described in
paragraphs 1 to 5.
3-Series models
9Disengage the glass from the front guide
roller, and prise out the rubber window
guides.
10Remove the door handle screws, and
allow the handle assembly to hang out of the
way.
11Remove the rear window frame bolts,
push the frame into the door, and remove the
window glass.
12Refitting is the reverse of removal.
5-Series models
13Loosen the rear window guide mounting
bolt.14Detach the glass from the front guide
roller, disengage the glass from the guide
rails, then slide the glass to the rear and
remove by lifting from above.
15The fixed glass can be removed by
removing the guide rail bolts, then pulling the
rail down to the rear and detaching the glass.
16Refitting is the reverse of removal. The
rear window glass can be adjusted by
loosening the adjustment bolts, then raising
the glass to within one inch of the top of the
door opening. Adjust the glass-to-
opening gap evenly, then tighten the bolts
securely.
17 Door window regulator-
removal and refitting
3
Removal
1Remove the door window glass (Sec-
tion 16).
2Remove the securing bolts or nuts, and lift
the window regulator assembly out of the
door (withdraw the regulator mechanism
through the access hole). On models with
electric windows, unplug the electrical
connector.
Refitting
3Refitting is the reverse of removal.
18 Exterior mirror-
removal and refitting
1
Removal
1If it is required to renew the mirror glass
only, insert a small screwdriver through the
hole in the bottom of the exterior mirror, and
carefully lever clockwise the plastic holder on
the rear of the glass (ie move the bottom of
the screwdriver to the right). This will release
the glass, which can then be withdrawn. If
electric mirrors are fitted, it will be necessary
to disconnect the wiring before completely
removing the glass.
2To remove the complete mirror, prise off
the cover panel (and/or the tweeter speaker,
where applicable).
3Unplug the electrical connector.
4Remove the retaining screws and lift the
mirror off
Refitting
5Refitting is the reverse of removal.
11•8 Bodywork and fittings
15.2 Typical door latch, lock cylinder and
handle details
14.14 Unscrewing the hinge mounting
bolts (5-Series)

19 Steering column shrouds -
removal and refitting
1
Caution: If the radio in your
vehicle is equipped with an anti-
theft system, make sure you have
the correct activation code
before disconnecting the battery, Refer to
the information on page 0-7 at the front of
this manual before detaching the cable.
Note: If, after connecting the battery, the
wrong language appears on the instrument
panel display, refer to page 0-7 for the
language resetting procedure.
Removal
1Disconnect the battery negative cable.
2Remove the steering wheel (Chapter 10).
3Remove the upper shroud screws (see
illustration).
4Remove the two screws from the underside
of the column (see illustration).
5Detach the lower shroud, then lift the upper
half off the column (see illustrations).
Refitting
6Refitting is the reverse of removal.
20 Seats- removal and refitting
1
Front seat
1Remove the four bolts securing the seat
track to the floorpan, and lift the seat from the
vehicle (see illustration). On some models, it
will be necessary to disconnect the seat
heating wiring; it may also be necessary to
detach the seat belt from the seat.2Refitting is the reverse of removal. Tighten
the retaining bolts securely.
Rear seat cushion
3If applicable, first remove the two retaining
bolts. Grasp the front of the cushion
(Saloon/Convertible models) or the rear of the
cushion (Touring/Estate models) securely, and
pull up sharply (see illustration).
4Refitting is the reverse of the removal.
21 Seat belt check
1
1Check the seat belts, buckles, lock plates
and guide loops for obvious damage and
signs of wear.
2Where applicable, check that the seat belt
reminder light comes on when the ignition key
is turned to the Run or Start position.
3The seat belts are designed to lock up
during a sudden stop or impact, yet allow free
movement during normal driving. Check thatthe retractors return the belt against your
chest while driving and rewind the belt fully
when the buckle is unlocked.
4If any of the above checks reveal problems
with the seat belt system, renew parts as
necessary.
5Belts which have been subject to impact
loads must be renewed.
Bodywork and fittings 11•9
19.5a Pull the tilt lever down (where fitted),
and lower the shroud from the steering
column19.4 The lower screws are located under
the tilt lever (where fitted)19.3 Use a Phillips screwdriver to remove
the upper column shroud screws
20.3 Grasp the seat at the front edge and
pull up sharply (Saloon/Convertible
models)20.1 The front seats are held in place by
bolts (arrowed)
19.5b Rotate the upper shroud up and off
the steering column
11

12
Chapter 12 Body electrical systems
Bulb renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Central locking system - description and check . . . . . . . . . . . . . . . . 20
Cruise control system - description and check . . . . . . . . . . . . . . . . 19
Direction indicator/hazard warning flasher - check and renewal . . . 5
Electric windows - description and check . . . . . . . . . . . . . . . . . . . . 21
Electrical system fault finding - general information . . . . . . . . . . . . . 2
Fuses - general information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Headlight housing - removal and refitting . . . . . . . . . . . . . . . . . . . . . 14
Headlights - adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Headlights - bulb renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Heated rear window - check and repair . . . . . . . . . . . . . . . . . . . . . . 17
Ignition switch - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . 7
Instrument cluster - removal and refitting . . . . . . . . . . . . . . . . . . . . . 10
Radio - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Radio aerial - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Relays - general information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Service Indicator (SI) board - general information . . . . . . . . . . . . . . 11
Steering column switches - removal and refitting . . . . . . . . . . . . . . . 6
Supplemental Restraint System (SRS) - general information . . . . . . 18
Windscreen/tailgate wiper motor - removal and refitting . . . . . . . . . 16
Wiring diagrams - general information . . . . . . . . . . . . . . . . . . . . . . . 22
12•1
Easy,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 Contents
1 General information
The chassis electrical system of this vehicle
is of 12-volt, negative earth type. Power for
the lights and all electrical accessories is
supplied by a lead/acid-type battery, which is
charged by the alternator.
This Chapter covers repair and service
procedures for various chassis (non-engine
related) electrical components. For
information regarding the engine electrical
system components (battery, alternator,
distributor and starter motor), see Chapter 5.
Warning: To prevent electrical
short-circuits, fires and injury,
always disconnect the battery
negative terminal before
checking, repairing or renewing electrical
components.
Caution: If the radio in your
vehicle is equipped with an anti-
theft system, make sure you have
the correct activation code
before disconnecting the battery, Refer to
the information on page 0-7 at the front of
this manual before detaching the cable.
Note: If, after connecting the battery, the
wrong language appears on the instrument
panel display, refer to page 0-7 for the
language resetting procedure.
2 Electrical system fault
finding- general information
2
A typical electrical circuit consists of an
electrical component, any switches, relays,
motors, fuses, fusible links or circuit breakers,
etc related to that component, and the wiring
and connectors that link the components to
both the battery and the chassis. To help you
pinpoint an electrical circuit problem, wiring
diagrams are included at the end of this book.
Before tackling any troublesome electrical
circuit, first study the appropriate wiring
diagrams to get a complete understanding of
what makes up that individual circuit.
Troublespots, for instance, can often be
isolated by noting if other components related
to that circuit are routed through the same
fuse and earth connections.
Electrical problems usually stem from
simple causes such as loose or corroded
connectors, a blown fuse, a melted fusible
link, or a bad relay. Inspect all fuses, wires
and connectors in a problem circuit first.
The basic tools needed include a circuit
tester, a high-impedance digital voltmeter, a
continuity tester and a jumper wire with an in-
line circuit breaker for bypassing electrical
components. Before attempting to locate or
define a problem with electrical testinstruments, use the wiring diagrams to
decide where to make the necessary
connections.
Voltage checks
Perform a voltage check first when a circuit
is not functioning properly. Connect one lead
of a circuit tester to either the negative battery
terminal or a known good earth.
Connect the other lead to a connector in
the circuit being tested, preferably nearest to
the battery or fuse. If the bulb of the tester
lights up, voltage is present, which means that
the part of the circuit between the connector
and the battery is problem-free. Continue
checking the rest of the circuit in the same
fashion.
When you reach a point at which no voltage
is present, the problem lies between that point
and the last test point with voltage. Most of
the time, problems can be traced to a loose
connection.Note:Keep in mind that some
circuits receive voltage only when the ignition
key is turned to a certain position.
Electrical fault diagnosis is simple if you
keep in mind that all electrical circuits are
basically electricity running from the battery,
through the wires, switches, relays, fuses and
fusible links to each electrical component
(light bulb, motor, etc) and then to earth, from
where it is passed back to the battery. Any
electrical problem is an interruption in the flow
of electricity to and from the battery.

13 Headlights- adjustment
2
Note:The headlights must be aimed correctly.
If adjusted incorrectly, they could momentarily
blind the driver of an oncoming vehicle and
cause a serious accident, or seriously reduce
your ability to see the road. The headlights
should be checked for proper aim every
12 months (as is done during the MOT test),
and any time a new headlight is fitted or front-
end body work is performed. It should be
emphasised that the following procedure will
only provide a temporary setting until the
headlights can be adjusted by a properly-
equipped garage.
1Each headlight has two adjusting screws,
one controlling up-and-down movement and
one controlling left-and-right movement (see
illustration). It may be necessary to remove
the grille (see Chapter 11) for access to these
screws.
2There are several methods of adjusting the
headlights. The simplest method requires a
blank wall (or garage door) 25 feet in front of
the vehicle, and a level floor.
3Position masking tape vertically on the wall,
to mark the vehicle centreline and the
centreline of both headlights. Note:It may be
easier to position the tape on the wall with the
vehicle parked only a few inches away, and
then move the vehicle back the required
distance when all marks have been made.
4Make a horizontal line on the wall to mark
the centreline of all headlights.
5Move the vehicle back so that it is 25 feet
away from the marked wall (keep the front end
of the vehicle square to the wall). Adjustment
should be made with the vehicle sitting level,
the fuel tank half-full, and with no unusually
heavy loads in the vehicle.
6Switch on the dipped beam. The bright
spots on the wall should be two inches below
the horizontal line, and two inches to the left
of the headlight vertical lines. Adjustment is
made by turning the adjusting screw to raise
or lower the beam. The other adjusting screwshould be used in the same manner to move
the beam left or right.
7With main beam on, the bright spots on the
wall should be exactly on the vertical lines,
and just below the horizontal line. Note:It may
not be possible to position the headlight aim
exactly for both main and dipped beams. If a
compromise must be made, keep in mind that
the dipped beam is most used, and will have
the greatest effect on driver safety.
8Have the headlights adjusted by a dealer
service department or qualified garage at the
earliest opportunity.
14 Headlight housing-
removal and refitting
1
Caution: If the radio in your
vehicle is equipped with an anti-
theft system, make sure you have
the correct activation code
before disconnecting the battery, Refer to
the information on page 0-7 at the front of
this manual before detaching the cable.
Note: If, after connecting the battery, the
wrong language appears on the instrument
panel display, refer to page 0-7 for the
language resetting procedure.
Removal
1Disconnect the battery negative cable.2Remove the side grille (see Chapter 11),
then remove the rear cover(s) where
necessary.
3Unplug the headlight (sealed beam-type) or
remove the bulb (halogen bulb-type).
4Remove the screws and detach the housing
(see illustration).
Refitting
5Refitting is the reverse of removal.
15 Bulb renewal
1
1The lenses of many lights are held in place
by screws, which makes it a simple procedure
to gain access to the bulbs.
2On some lights, the lenses are held in place
by clips. The lenses can be removed by using
a small screwdriver to prise them off.
3Several bulbs are mounted in self-earthing
holders, and are removed by pushing in and
turning them anti-clockwise (see illustration).
The bulbs can then be removed (see
illustrations).
4The tail lights on 3-Series models are
accessible after removing the housing, then
removing the bulbs (see illustrations).
5To gain access to the facia lights, the
instrument cluster will have to be removed
first (see illustration).
12•6 Body electrical systems
15.3c . . . then pull the bulb from the
holder15.3b On models with high-mounted
centre brake lights, the self-earthing
holder is accessible from the luggage area
- pull the holder out . . .15.3a The tail light bulbs on later 5-Series
models are in self-earthing holders which
can be simply pulled out of the housing -
the bulb is then removed from the holder
14.4 Remove the screws (arrowed) and
detach the headlight housing13.1 The headlight adjustment screws
(arrowed) are accessible from the back of
the headlight on 3-Series models

16 Windscreen/tailgate wiper
motor- removal and refitting
2
Caution: If the radio in your
vehicle is equipped with an anti-
theft system, make sure you have
the correct activation code
before disconnecting the battery, Refer to
the information on page 0-7 at the front of
this manual before detaching the cable.
Note: If, after connecting the battery, the
wrong language appears on the instrument
panel display, refer to page 0-7 for the
language resetting procedure.
1Disconnect the battery negative cable.
Windscreen wiper motor
2Remove the covers and nuts, then detach
the wiper arms (see illustrations).
3Prise out the retaining clips and detach the
cowl grille for access to the wiper assembly.
4Remove the screws or nuts and detach the
wiper cover located on the engine
compartment bulkhead.
5Unplug the electrical connector and detach
the wiper linkage.
6Mark the relationship of the wiper shaft to the
linkage. Detach the wiper link from the motor
shaft by prising carefully with a screwdriver.
7Remove the three retaining bolts and
remove the wiper motor from the vehicle.
8Refitting is the reverse of removal. When
fitting the motor, if necessary plug in theconnector and run the motor briefly until it is
in the “neutral” (wipers parked) position.Tailgate wiper motor
9On 3-Series models, remove the cover and
nut, then detach the wiper arm (see
illustration). On 5-Series models, open the
rear window away from the tailgate.
10As applicable, remove the trim panel(s),
then disconnect the washer tube and the
wiring plug.
11Unscrew the mounting nuts and withdraw
the wiper motor (see illustrations). On 5-
Series models, the wiper blade and pivot
mechanism may be removed from the rear
window if necessary after removing the trim
panels (see illustration).
Body electrical systems 12•7
15.5 After removing the instrument cluster
(see Section 10), turn the bulbholder anti-
clockwise to remove the bulb15.4b . . . then remove the bulb from the
housing15.4a On 3-Series models, the entire tail
light housing assembly is self-earthing
through the mounting screw - loosen the
plastic screw and pull the housing back . . .
16.11a Removing the tailgate wiper motor (3-Series)
16.2b After removing the nut, use a magnet to lift out the metal
washer16.2a Use a small screwdriver to detach the wiper arm nut cover,
or swivel the cover up
16.9 Removing the tailgate wiper arm nut (3-Series)
12

12Refitting is a reversal of removal. When
fitting the motor, if necessary plug in the
connector and run the motor briefly until it is
in the “neutral” (wiper parked) position.
17 Heated rear window-
check and repair
2
1The heated rear window consists of a
number of horizontal elements on the glass
surface.
2Small breaks in the element can be repaired
without removing the rear window.
Check
3Switch on the ignition and the heated rear
window.
4Place the positive lead of a voltmeter to the
heater element nearest to the incoming power
source.
5Wrap a piece of aluminium foil around the
negative lead of the voltmeter on the positive
side of the suspected broken element, and
slide it slowly towards the negative side.
Watch the voltmeter needle - when it moves
from zero, you have located the break.
Repair
6Repair the break in the line using a repair kit
recommended specifically for this purpose,
such as BMW repair kit No. 81 22 9 (or
equivalent). Included in this kit is plastic
conductive epoxy. The following paragraphs
give general instructions for this type of repair;
follow the instructions supplied with the repair
kit if they are different.
7Prior to repairing a break, switch off the
circuit and allow it to cool down for a few
minutes.
8Lightly buff the element area with fine steel
wool, then clean it thoroughly.
9Use masking tape to mask off the area of
repair, leaving a slit to which the epoxy can be
applied.
10Mix the epoxy thoroughly, according to
the instructions on the package.
11Apply the epoxy material to the slit in the
masking tape, overlapping the undamaged
area about 20 mm on each end.12Allow the repair to cure for 24 hours
before removing the tape and using the
heated rear window.
18 Supplemental Restraint
System (SRS)- general
information
Later models are equipped with a
Supplemental Restraint System (SRS),
incorporating an airbag. This system is
designed to protect the driver from serious
injury in the event of a head-on or frontal
collision. It consists of an airbag module in the
centre of the steering wheel, two crash
sensors mounted on the front inner wing
panels, and a crash safety switch located
inside the passenger compartment.
The airbag module contains a housing
incorporating the airbag and the inflator units.
The inflator assembly is mounted on the back
of the housing over a hole through which gas
is expelled, inflating the bag almost instanta-
neously when an electrical signal is sent from
the system. This signal is carried by a wire
which is specially wound with several turns,
so the signal will be transmitted regardless of
the steering wheel position.
The SRS system has three sensors: two at
the front, mounted on the inner wing panels
(see illustration), and a safety switch located
inside the passenger compartment. The crash
sensors are basically pressure-sensitive
switches, which complete an electrical circuit
during an impact of sufficient force. The
electrical signal from the crash sensors is sent
to a third sensor, which then completes the
circuit and inflates the airbag.
The module containing the safety switch
monitors the system operation. It checks the
system every time the vehicle is started,
causing the AIRBAG warning light to come on,
then go out if the system is operating
correctly. If there is a fault in the system, the
light will stay on. If the AIRBAG warning light
does stay on, or if it comes on while driving,
take the vehicle to your dealer immediately.
19 Cruise control system-
description and check
1
The cruise control system maintains vehicle
speed using a vacuum-actuated servo motor
located in the engine compartment, which is
connected to the throttle linkage by a cable.
The system consists of the servo motor,
clutch switch, brake switch, control switches,
a relay, and associated vacuum hoses.
Because of the complexity of the cruise
control system, repair should be left to a
dealer service department. However, it is
possible for the home mechanic to make
simple checks of the wiring and vacuum
connections for minor faults which can be
easily repaired. These include:
a) Inspect the cruise control actuating switches
for broken wires and loose connections.
b) Check the cruise control fuse.
c) The cruise control system is operated by
vacuum, so it’s critical that all vacuum
switches, hoses and connections are
secure. Check the hoses in the engine
compartment for loose connections,
cracks, or obvious vacuum leaks.
20 Central locking system-
description and check
2
The central door locking system operates
the door lock actuators mounted in each
door. The system consists of the switches,
actuators and associated wiring. Diagnosis is
limited to simple checks of the wiring
connections and actuators for minor faults
which can be easily repaired. These include:
a) Check the system fuse and/or circuit
breaker (where applicable).
b) Check the switch wires for damage and
loose connections. Check the switches
for continuity.
c) Remove the door trim panel(s), and check
the actuator wiring connections to see if
they’re loose or damaged. Inspect the
actuator rods to make sure they aren’t
12•8 Body electrical systems
18.3 The SRS system crash sensors
(arrowed) are located in the engine
compartment - check the wiring regularly
for damage16.11b Tailgate wiper motor (5-Series)16.11c Wiper blade and pivot mechanism
on the rear window (5-Series)