1983 FIAT UNO headlamp

View of front end from below on
the 999 cc FIRE engined model
1 Left hand front engine mounting
2 Transmission
3 Track control arm
4 Driveshaft
5 Left hand rear (lower) engine
mounting
6 Gearchange rods
7 Exhaust pipe
8 Oil filter cartridge
9 Brake caliper
10 Sump pan drain plug
View of engine compartment on
the 1301 cc Turbo ie engined
model
1 Alternator air cooling intake
2 Washer fluid reservoir cap
3 Suspension strut turret
4 Secondary fuel filter
5 Fuel supply hose
6 Coolant expansion tank
7 Brake fluid reservoir cap
8 Ignition system ECU
9 Inlet manifold
10 Excessive pressure switch
11 Air cleaner
12 Timing belt cover
13 Fuel pressure regulator
14 Airflow meter
15 Throttle position switch
16 Air intake duct
17 Air intake to throttle valve
housing
18 Engine oil filler cap
19 Radiator cooling fan
20 Headlamp dim-dip transformer
21 Intercooler air duct
22 Ignition distributor
23 Headlamp
24 Main idle speed adjusting screw
25 Base setting idle speed screw
13•6 Supplement: Revisions and information on later models

Torque wrench settingsNm lbf ft
Driveshaft flange connecting bolts (Turbo ie) . . . . . . . . . . . . . . . . . . . . . 43 32
Final drive output shaft bearing cover bolts (Turbo ie) . . . . . . . . . . . . . . 24 18
Intermediate shaft support to crankcase (Turbo ie) . . . . . . . . . . . . . . . . 48 35
Braking system (903, 999, 1108, 1116 and 1372 cc)
General
Note:The following items differ, or are additional to those specified in Chapter 8:
Master cylinder bore diameter:
903 cc, 999 cc, 1108 cc and 1116 cc . . . . . . . . . . . . . . . . . . . . . . . . . 19.05 mm
1372 cc ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.65 mm
Vacuum servo diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.4 mm
Hydraulic push rod-to-master cylinder support plate clearance . . . . . . 0.825 to 1.025 mm
Braking system (1301 and 1372 cc Turbo ie)
General
System type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Four-wheel discs, ventilated front, solid rear. Vacuum servo. Pressure
regulating valve on rear brakes
Master cylinder bore diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.225 mm
Vacuum servo diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177.8 mm
Front disc brakes
Disc diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240.0 mm
Disc thickness - new . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.9 to 20.1 mm
Disc thickness - minimum (refinishing) . . . . . . . . . . . . . . . . . . . . . . . . . . 18.6 mm
Disc thickness - minimum (wear limit) . . . . . . . . . . . . . . . . . . . . . . . . . . 18.2 mm
Minimum thickness of pad friction material . . . . . . . . . . . . . . . . . . . . . . 1.5 mm
Caliper cylinder diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48.0 mm
Rear disc brakes
Disc diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227.0 mm
Disc thickness - new . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 to 10.9 mm
Disc thickness minimum (refinishing):
1301 cc Turbo ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.7 mm
1372 cc Turbo ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.35 mm
Disc thickness - minimum (wear limit) . . . . . . . . . . . . . . . . . . . . . . . . . . 9.0 mm
Minimum thickness of pad friction material . . . . . . . . . . . . . . . . . . . . . . 1.5 mm
Caliper cylinder diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.0 mm
Torque wrench settingsNm lbf ft
Front caliper cylinder housing mounting bolts . . . . . . . . . . . . . . . . . . . . 52 38
Front caliper support bracket bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 38
Front disc fixing bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 18
Rear caliper support bracket bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 18
Rear caliper cylinder housing mounting bolts . . . . . . . . . . . . . . . . . . . . 52 38
Electrical system
Battery
Turbo ie engine models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Ah
Fuses (903, 999, 1116, 1299/1301 and 1301 cc Turbo ie)
Fuse No. Rating Circuit
1 7.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LH tail, RH front parking, rear number plate, check panel
2 7.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RH tail, LH front parking, cigar lighting, clock light, heater control
illumination, map reading lamp.
3 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RH headlamp main beam
4 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LH headlamp main beam and warning light
5 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radiator cooling fan, econometer and horns
6 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cigar lighter, courtesy lamps, digital clock, stop-lamp switch, clock
and radio
7 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RH headlamp dipped beam
8 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LH headlamp dipped beam, rear fog warning lamp and indicator
9 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heated rear screen and warning lamp
10 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instrument panel, stop-lamps, direction indicators, reversing lamps
and warning module
11 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heater fan, fan control illumination and digital clock
12 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Windscreen wiper, washer pump and rear screen wiper
13 - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spare
14 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hazard warning lamps and indicator
Supplement: Revisions and information on later models 13•15
13

Fuses (903, 999, 1116, 1299/1301 and 1301 cc Turbo ie) (continued)
Fuse No. Rating Circuit
Supplementary fuses at side of main fuse block:
A 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front fog lamps
B 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cooling fan (Turbo ie models)
C 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel injector cooling fan (Turbo ie models)
D 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electric windows
E 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel pump (Turbo ie models)
Fuses (later 903, 999, 1108, 1372 ie and 1372 cc Turbo ie)
Fuse Rating Circuit
1 7.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LH tail, RH front parking, rear number plate lamps and check panel
2 7.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RH tail, LH front parking, cigar lighter illumination, clock light, heater
control illumination and map reading light
3 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RH headlamp main beam
4 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LH headlamp main beam and warning light
5 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radiator cooling fan (except Turbo ie models) and horn
6 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cigar lighter, courtesy lamps, digital clock, stop-lamp switch, clock
and radio
7 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RH headlamp dipped beam
8 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LH headlamp dipped beam
9 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear fog lamp and warning lamp
10 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heated rear screen and warning lamp
11 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instrument panel, stop-lamps, direction indicators, reversing lamps,
warning module and carburettor cut-off (FIRE models only)
12 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heater fan, heater/ventilation control illumination lights and digital
clock light
13 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Windscreen wiper, windscreen washer pump and rear wiper/washer
(where fitted)
14 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Horns and relay
15 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hazard warning light and indicator light
Supplementary fuses at side of main fuse block:
A 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electric windows
B 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Central locking (where fitted)
C 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Injector cooling fan (where fitted)
D 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Headlamp washers (where fitted)
E 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Foglamp and warning lamp
F - . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spare
G 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel pump (fuel injection models)
-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heated Lambda sensor
Supplementary fuses on steering column relay bracket:
-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Antiskid monitor circuit (where fitted)
-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Antiskid supply circuit (where fitted)
Steering and suspension
General
1301 cc Turbo ie
Castor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1º 55’ to 2º 35’ positive
Number of turns of steering wheel, lock-to-lock . . . . . . . . . . . . . . . . . . 3.42
Later models
Steering angles:
Camber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30’ ± 30’
Castor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2º10’ ± 15’
Toe-in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 2.0 mm
1301/1372 cc Turbo ie
Steering angles of roadwheels:
Inner wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36º 43’
Outer wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31º 27’
Torque wrench settingsNm lbf ft
Anti-roll bar clamp bolts (1301 and 1372 cc Turbo ie) . . . . . . . . . . . . . . 25 18
Anti-roll bar end fixing nuts (1301 and 1372 cc Turbo ie) . . . . . . . . . . . 15 11
13•16 Supplement: Revisions and information on later models

Starter motor brushes
(later models) - renewal#
25When renewing the starter motor brushes
on later models, the old brushes will need to
be crushed (in a vice or with a hammer) and
their leads then soldered to the new brushes.
Fuses - later models
26The fuse arrangement is slightly different
on later models, but the circuits protected are
still identified by a symbol. Refer to the
Specifications Section for full details. Note
also the terminal block with plastic cover,
which can be used to isolate the battery from
the electrical system by disconnecting the
leads from the terminals (photos).
Relays (Turbo ie models) -
general
27On Turbo ie models, the relays mounted
in the fuse block are as shown in Fig. 13.103.
Additional relays are located as follows:
Headlamp relay - on lead under main fuse
blockFuel injection system main control relay -
adjacent to airflow meter
Headlamps later models
28The headlamp units fitted on later models
differ according to model, but the bulb and
unit replacement details are generally the
same as described for previous models in
Chapter 9. Note that the rubber cover can
only be fitted with the tab to the top as shown
(photo).
Headlamp beam adjusters for
load compensation - later
models
29Some later models are fitted with
headlamp beam adjusters which allowtemporary resetting to be made (such as
when the car is fully loaded). Access to these
adjusters is made by lifting the bonnet (photo).
30Turn the adjusters anti-clockwise to lower
the beam to the normal level or clockwise to
raise the beam (when the car is unloaded).
Repeat the procedure on the opposite
headlamp unit an equal amount.
31Other later models have separate
horizontal and vertical beam adjusters,
positioned as shown (photos). A load
compensating lever is attached to the
adjusters to enable temporary resetting of the
headlamp beams, without changing the
normal adjustment. Turn the lever to the
appropriate side (right or left) to make the
adjustment as required. The normal setting
Supplement: Revisions and information on later models 13•105
15.26B Battery lead terminal block on the
1301 cc Turbo ie model15.23B Starter motor and wiring
connections on the 1372 cc ie engine
15.31B Headlamp vertical beam alignment
adjuster screw on a 1372 cc ie model. Note
the load compensator lever which is set in
the “O” (normal load) setting position15.31A Headlamp horizontal beam
alignment adjuster screw on a 1372 cc ie
model
15.29 Headlamp beam adjuster on the
999 cc Turbo ie model15.28 Headlamp unit fitted to the 1372 cc ie
model
15.26A Fuse block on the 1301 cc Turbo ie
model
13
Fig. 13.103 Auxiliary fuses and relays on
1301 cc Turbo ie models (Sec 15)
1 Horn relay
2 Heated rear screen relay
3 Foglamps relay
4 Radiator fan relay
5 Electric windows relay
6 Foglamps fuse
7 Radiator fan second speed fuse
8 Fuel injector fan fuse
9 Electric windows fuse
10 Electric fuel pump fuse

adjustment procedures are the same as those
outlined for the previous model units in
Chapter 9, but ensure that the load
compensation lever is turned to the “O”
(normal load setting) position before making
any adjustments.
Headlamp unit removal - later
models
32The removal and refitting procedures
described in Chapter 9 also apply to the later
headlamp type, but note that later units are
secured in position by three retaining screws.
Headlamp dim-dip system -
description
33On later models, the wiring circuit has
been modified to prevent the car being drivenon parking lamps only in built-up areas.
34Headlamp intensity is reduced by the
transformer located at the front of the engine
compartment (photo).
35Any attempt to start the car with parking
lamps only on will automatically cause the
headlamps to switch on with a low-intensity
dipped beam. Dipped and main beam
function normally.
36The headlamp dim-dip system is a legal
requirement for all UK models registered after
April 1st, 1987.
Front fog lamps - bulb/unit
removal and refitting
and beam adjustment
ª
37Ensure that the front fog lamps are
switched off, then unscrew the two retainingscrews and withdraw the lamp unit from the
underside of the front bumper (photos).
38Undo the retaining screw and remove the
access cover from the unit (photo).
39Disconnect the wiring connector from the
bulb, release the clips and withdraw the bulb
from the lamp (photo).
40Refit in the reverse order of removal.
Check the light for satisfactory operation and
if the beam requires resetting, turn the
adjustment screw in the required direction.
41To adjust the beam, position the car 5 m
from, and square on to, a wall or similar.
42Measure the height of the centre of the
lamp lens from the ground and mark the
position on the wall. Switch on the lamp. The
demarcation line (cut-off) of the light should
be below the mark on the wall by 50 mm plus
one-third of the ground-to-lamp centre
measurement. Adjust the beam as required
using the long centre screw.
Horn - relocation
43The single horn, on applicable models, is
now located behind the grille, bolted on a
bracket attached to the top rail (photo).
Steering column combination
switches (later models) -
removal and refitting
Á
44Disconnect the battery negative lead.
45Undo the retaining screws and remove
the steering column shrouds (photos).
46Remove the steering wheel as described
in Chapter 10.
13•106 Supplement: Revisions and information on later models
15.45B . . . then remove the upper . . .15.45A Undo the retaining screws . . .15.43 Horn location
15.39 . . . detach the wires, extract the bulb15.38 . . . remove the rear cover . . .
15.37B . . . and withdraw the front fog lamp
unit . . .15.37A Undo the retaining bolts . . .15.34 Headlamp dim-dip transformer

Wiring diagrams 14•1
14
Component key for wiring diagrams 1 to 29
Note: Not all the items listed will be fitted to all models
No Description
00200 Alternator with built-in regulator
00500 Battery
01001 Starter motor
01202 Rear front electric window motor
01203 Left front electric window motor
01206 Windscreen wiper motor
01207 Rear screen wiper motor
01252 Right front door locking motor
01253 Left front door locking motor
01254 Right rear door locking motor
01255 Left rear door locking motor
01400 Windscreen washer pump
01401 Rear screen washer pump
01420 Electric fuel pump
01500 Engine cooling fan
01502 Injector cooling fan
01504 Ventilation fan
02001 Engine cut-out solenoid on injection pump
02010 Fuel injector
02011 Fuel injector
02012 Fuel injector
02013 Fuel injector
02015 Supplementary air valve
02210 Accelerator pump outlet cut-out solenoid on
carburettor
02215 Supplementary air valve
02400 Ignition coil
02405 Ignition coil with electronic control unit
02490 Static advance ignition control unit
02492 Microplex ignition system control unit
03000 Insufficient engine oil pressure switch
03002 Right front door ajar switch
03003 Left front door ajar switch
03004 Right rear door ajar switch
03005 Left rear door ajar switch
03006 Handbrake ‘on’ warning switch
03007 Brake stop-lamp switch
03008 Reversing light switch
03028 Radiator thermostatic switch
03029 Coolant overheating warning light thermostatic switch
03034 Injector cooling fan thermostatic switch
03035 Accelerator pump outlet cut-out solenoid thermostatic
switch
03036 Radiator thermostatic switch with two operating ranges
03053 Map reading light switch
03059 Foglamps switch
03060 Rear foglamp switch
03110 Heated rear screen switch
03114 Ventilation fan switch
03123 Air pressure switch
03142 Choke warning light switch
03144 Reset switch
03145 Display switch
03305 Right front door open light push button
03306 Left front door open light push button No Description
03319 Horn push button
03500 Ignition switch
03505 Butterfly valve cut-off switch
03506 Throttle position switch
03530 Right front electric window switch
03531 Left front electric window switch
03546 Rear screen wash/wipe switch
03550 Hazard warning lights switch
04010 Steering column switch unit, direction indicators
04022 Steering column switch unit, headlamps, main beam
and dipped, side lights
04032 Steering column switch unit, windscreen wash/wipe
04214 Fuel injection system control relay
04215 Antiskid system failure relay
04225 Radiator fan 2nd speed engagement relay feed
04241 Foglamps relay feed
04260 Electric windows motor relay feed
04283 Antiskid system relay
04291 Horn relay feed
04292 Heated rear screen relay feed
04441 Dim-dip cut-out 04600 Ignition distributor
04700 Coolant temperature sender unit
04701 Electronic injection coolant temperature sender unit
04720 Oil pressure sender unit
05008 Right headlamp, main beam and dipped with side light
05009 Left headlamp, main beam and dipped with side light
05013 Abnormal fuel consumption sensor
05015 Right foglamp
05016 Left foglamp
05410 Right front direction indicator
05411 Left front direction indicator
05412 Right front side direction indicator
05413 Left front side direction indicator
05640 Rear number plate lamp
05690 Right rear light cluster, sidelight, direction indicator,
brake light, rear foglamp
05691 Left rear light cluster; side light, direction indicator,
brake light, rear foglamp
06000 Centre courtesy light
06026 Map reading light
06076 Ideogram fibre optic light
06080 Heater controls light
06084 Instrument panel light
06300 Sidelights warning light
06305 Main beam headlamps warning light
06310 Rear foglamps warning light
06311 Foglamps warning light
06315 Hazard warning lights warning light
06320 Direction indicators warning light
06335 Insufficient brake fluid level warning light
06336 Handbrake ‘on’ warning light
06343 Insufficient engine oil pressure warning light
06344 Insufficient brake fluid level warning light
06345 Fuel reserve warning light
06350 Coolant overheating warning light

14•6 Wiring diagrams
Wiring diagram 7 - headlamps, reversing lamps and front and rear foglamps
(SX model)
Wiring diagram 8 - headlamps, reversing lamps and rear foglamps (Comfort,
ES and S models)

Wiring diagram 15 - central door locking and electric windows
(S and SX models)
Wiring diagram 16 - headlamp dim-dip system (1987-on models)
14•10 Wiring diagrams