PONTIAC FIERO 1988 Service Repair Manual

88-2 LIGHTING SYSTEMS AND HORNS
The fog lights must be aimed for proper
illumination of the road. Fog light
aim should be
checked: at least once a year; when a new light housing
is installed; or if service or repairs in the front end area
have (or may have) disturbed the fog light mountings.
FRONT PARKING/TURM SIGNAL
LIGHTS - Pushing either side of the instrument panel
switch will turn on the front parking lights. (Pushing
the left side of the switch will also turn on the
headlights.) When the ignition is on and the turn signal
lever is moved, the appropriate front parking light
flashes to signal a turn. Both lights will flash when the
hazard flashers are on.
If the driver's door is opened when the parking
lights are on, a warning tone will sound. For more
information, see Section
8A-77.
HAZARD FLASHERS - The hazard warning
flasher is part of the turn signal circuit. Pushing in the
button (on the right side of the steering column) will
cause the front and rear turn signal lights, and the front
sidemarker lights, to flash. Pull out the collar around
the button to turn off the hazard flashers.
The hazard flashers will work with the ignition
either off or on. When the hazard flashers are on, the
turn signals do not
work.
The hazard flashers will stop flashing and stay on
brightly if the brake pedal is pushed down.
HEADLIGHTS - The headlights are controlled
by the switch on the instrument panel (to the left of the
speedometer). They will come on whether or not the
ignition is turned on. Pushing the upper left side of the
switch turns on the headlights and causes the headlight
motors to raise the headlights. Pushing the bottom part
of the switch turns off the headlights, and they should
lower.
If the driver's door is opened when the ignition
is off and the headlights are on, a warning tone will
sound. For more information, see Section
8A-77.
Headlight low-beam and high-beam are
controlled by the turn
signal/multifunction lever on
the left side of the steering column. When the
headlights are on, pull the lever toward the steering
wheel until the switch clicks; the lights will change
from low-beam to high-beam, or from high-beam to
low-beam. An indicator light on the center instrument
cluster will come on when the high-beam headlights
are on.
The headlights must be aimed for proper
illumination of the road. Headlight aim should be
checked: at least once a year; when a new headlight
bulb is installed; or if service or repairs in the front end
area have (or may have) disturbed the headlights or
their mountings. The headlight bezels do not need to
be removed to aim the headlights.
Headlight focus is set when the sealed-beam unit
is made; no adjustment for focus is necessary or
possible.
Some state and local laws specify
requirements for headlight aim; these laws
must be followed.
LICENSE PLATE LBGHTS -A light above the
rear license plate will come on when the headlights or
parking lights are on.
LIGHT SWITCH - Most exterior lights are
controlled by the switch on the instrument panel, to the
left of the speedometer. Pushing the upper right part
of the switch turns on the front parking lights, the
taillights and the sidemarker lights. (It also turns on
the instrument panel lights.) Pushing the upper left
part of the switch turns on all these lights plus the
headlights. Pushing the bottom part of the switch turns
off all lights.
In some cases (such as going through a car wash),
it may be desirable to raise the headlights without
leaving the headlights on. To do so, push the upper
right part of the switch to turn on the parking lights.
Then, lightly push the upper right part of the switch;
the headlights will raise but will not turn on.
(Remember that the parking lights and taillights will
stay on.)
For more information on this switch (including
on-car service), see Section
8C. Also see Section 8C for
information on interior lights.
REAR TAlL/STOP/TURN SIGNAL
LIGHTS - The rear tail/stop/turn signal lights are
part of the same light assembly. Pushing either side of
the instrument panel switch turns on the taillights.
When the brake pedal is pushed down, the lights glow
brighter to serve as stoplights.
Moving the turn signal lever when the ignition is
on causes the appropriate rear lights to flash. (If the
brake pedal is held down and a turn is signalled, one
side will flash and the other will stay on brightly.)
All lights will flash when the hazard flashers are
on. However, if the brake pedal is pushed while the
hazard flashers are on, the lights will stop flashing and
stay on brightly.
SIDEMARKER LIGHTS -The front and rear
sidemarker lights will come on when the headlights or
parking lights are on. Both front and rear sidemarker
lights also have reflectors; they will shine when struck
by light, whether or not the car's lights are on.
If the headlights or parking lights are off when a
turn is signalled, the front sidemarker light will flash
in unison with the front turn signal light on the same
side. If the lights are on when a turn is signalled, the
front
sidemarker light and front turn signal light flash
alternately.
TURN SlG N ALS - The front turn signals are
combined with the front parking lights. The rear turn
signals are part of the rear
tail/stop/turn signal lights.
The turn signals work only when the ignition is on, and
the hazard flashers are turned off.
The turn signals are controlled by the turn
signal/multifunction lever on the left side of the
steering column. Moving the lever all the way up or
down (past the detent) will turn on the turn signals.
When the turn is completed, the lever will return to
neutral and the turn signals will stop flashing.
For changing lanes or shallow turns where the
steering wheel does not move far enough to cancel the
signal, move the turn signal lever only to the first
detent. When the lever is released, it will return to
neutral and the turn signals will cancel.
UNDERHOOD LIGHT - The underhood light
will come on when the hood is raised.

LIGHTING SYSTEMS AND HORNS 8B-3
HORNS the steering wheel sounds the horn by closing the horn
relay (in the convenience center behind the instrument
panel, to the right of the steering column). The horns
The holm(§) are mounted behind the front fascia use a solenoid-operated diaphragm to generate sound.
on the driver's side. $ushing the pad in the center of See Section 8A-40 for wiring and circuit information.
ON-CAR SERVICE
Wiring diagrams and other diagnosis information
is given in Section
8A. Information on properly
repairing wiring harnesses, connectors, etc., is on
8A-5.
Most lighting problems are caused by loose
connectors, open or shorted wiring, burned-out bulbs,
bad switches, inadequate ground or blown fuses. Many
of these require only replacement of a defective part.
When replacing a part that requires a special procedure
(such as a lens and housing assembly sealed together),
follow the instructions normally included in the
replacement parts package.
When removing a part that requires special
sealing items (such as sealing washers), be sure to
reinstall those items when replacing the part. Also, if
any body sealing items (grommets, etc.) are disturbed,
be sure to repair them so the passenger compartment
remains properly sealed.
EXTERlOR LIGHTS
BACK-UP LIGHTS
Fig. 8B-8
Replacement Bulb: Trade No. 1156, 32
Candlepower
To replace a back-up light bulb, see "Rear
Tail/Stop/Turn Signal Lights9' in this section. For
information on the back-up light switch on the
transmission, see Section
7.
CENTER HIGH-MOUNTED STOPLIGHT
Fig. 8B-7
Assembly Replacement
Remove or Disconnect
1. Spoiler (see Body Service Manual, Section 7H)
2. Four nuts from assembly
3. Stoplight assembly
Install or Connect
1. Stoplight assembly
2. Four nuts
3. Spoiler
Bulb Replacement
Replacement Bulb: Trade No. 577, 21
Candlepo wer
Remove or Disconnect
1. Two screws from lens
2. Lens
3. Bulb from socket
1. LAMP ASSEMBLY
2. SCREW($) 3. BULB
4. STUD8 ON SPOILER 5. WIRE HARNESS
Fig. 8B-1 Center High-Mounted Stoplight
Install or Corrnect
1. Bulb into socket
2. Lens
3. Two screws
FOG LIGHTS
Figs. 8B-2 and 88-3
Assembly or Bulb Replacement
Replacement Bulb: Trade No. H-3

8B-4 LIGHTING SYSTEMS AND HORNS
Remove or Disconnect
Six screws holding filler panel under front fascia
Filler panel
Electrical connector
Two bolts holding light
Fog light assembly by lowering through filler
panel opening
To replace bulb, remove two screws at front of
assembly
Install or Connect
Fog light assembly (including new bulb, if
necessary)
Two bolts
Electrical connector
Filler panel Six screws
Adjust
Fog light aim
FRONT PARKING/TURN SIGNAL LIGHTS
Fig. 88-4
Assembly Replacement
Remove or Disconnect
1. Open hood
2. Socket from assembly
3. Two bolts/screws
4. Assembly
Install or Connect
1. Assembly
2. Two bolts/screws
3. Socket
4. Close hood
Bulb Replacement
Replacement Bulb: Trade No. 2057, 32/2
Candlepower
VERTICAL ADJ. SCREW

FOG LAMP AIM SPECIFICATIONS
1. FOG LAMP TO BE VISUALLY AIMED AND CHECKED IN ACCORD WITH SECTIONS SIX AND SEVEN OF S.A.E. STANDARD J599.
2. PREPARE VEHICLE FOR CHECKING OF SETTING AIM
AS FOLLOWS:
A. COMPLETELY ASSEMBLE ALL COMPONENTS ON
VEHICLE.
B. PLACE
VEHICLEON LEVEL PAD.
C. STOP ALL OTHER OPERATIONS OF WORK ON
VEHICLE
D. CLOSE DOORS.
E. ROCK VEHICLE SIDEWAYS.
3. TO CHECK OF SET AIM PER J599, USE THE FOLLOWING LIMITS:
A. VERTICAL AIM. TOP EDGE OF
HIGH INTENSITY
ZONE TO BE 100mm BELOW CENTERLINE OF
FOG LAMP +51mm/-64mm ON A SCREEN 7.6m AWAY
FUEL LOAD TO BE %TANK OR LESS
Fig. 88-3 Fog Light Aiming

I
MAIN VIEW
I
1 - BOLTISCREW (2)
2 - PARKINGITURN LIGHT ASSEMBLY
3 - NUT (2)
4 - FRONT END PANEL ASSEMBLY
5 - SIDEMARKER LIGHT ASSEMBLY
VIEW A
6 - FENDER TABS (4)
7 - RETAINER (2)
Fig. 8B-4 Front Parkingflurn Signals and Sidemarker
Lights
LIGHTING SYSTEMS AND HORNS 88-5
Remove or Disconnect
1. Open hood
2. Socket from assembly
3. Bulb from socket
Install or Connect
1. Bulb into socket
2. Socket
3. Close hood
HAZARD FLASHER
The hazard flasher is in the convenience center,
behind the instrument panel to the right of the steering
column. To remove the flasher, lift it up and out.
HEADLIGHTS
Actuator Replacement
Fig. 88-5
Remove or Disconnect
1. Headlight assembly (see following procedure)
2. Nut from actuator arm
3. Three bolts attaching actuator to assembly
4. Actuator
Install or Connect
1. Actuator
2. Three bolts
3. Nut
4. Headlight assembly (see following procedure)
Assembly Replacement
Fig. 88-5
Remove or Disconnect
Open hood
Raise headlight by turning the knob on the
headlight motor counterclockwise
Four screws, two at each side of bezel
Bezel
Retaining spring, by using a hooked tool (such as
a cotter pin remover) to pull it to the side
Four screws from retainer
Retainer
Headlight by rotating toward center of car
Electrical connector
Turn the knob to lower the headlight assembly
about halfway
Two lower headlight assembly bolts by reaching
through opening
Two upper headlight assembly bolts
Electrical connector at motor
Headlight assembly
Install or Connect
1. Headlight assembly

1 - HEADLIGHT ADJUSTERS 7 - BEZEL RH & LH
2 - HEADLIGHT 8 - ACTIVATOR ARM NVT
3 - HEADLIGHT RETAINER 9 - FRONT SUPPORT
4 - SPRING 10 - ACTIVATOR BOLTS
5 - DOOR RH 81 LH 11 - SUPPORT
6 - HEADLIGHT BODY ASSEMBLY JP0004-8B-F
Electrical connector at motor
Two upper bolts
Two lower bolts
Raise headlight assembly
Electrical connector
Headlight Retainer
Four retainer screws
Bezel
Four screws at bezel
Retaining spring Lower headlight
Close hood
Adjust
e Headlight aim
Aiming Headlights
Fig. 8B-6
Horizontal and vertical aiming of each
sealed-beam headlight is done by two
(2) adjusting screws
which move the mounting ring in the body
against the tension of a coil spring. When using
mechanical aimers, follow the manufacturer's
instructions.
Bulb Replacement
Replacement Bulb: Trade No. H6054, 35
Wa t
t/65 Watt
Remove or Disconnect
1. Open hood
2. Raise headlight by turning knob on top of
headlight motor
3. Four screws, two at each side of bezel
4. Bezel
5. Retaining spring, by using a hooked tool (such as
a cotter pin remover) to move it to the side
6. Headlight by rotating toward center of car
7. Electrical connector
8. Retaining ring

install or Connect Adjust
1. Retaining ring e Headlight aim
2. Electrical connector
3. Headlight
4. Retaining spring
LICENSE PLATE LIGHT
Fig. 8B-7
5. Bezel Assembly or Bulb Replacement
6. Four screws into bezel
7. Lower headlight Remove or Disconnect
8. Close hood 1. License plate

88.8 LIGHTING SYSTEMS AND HORNS
2. Two screws
3. Light assembly
4. Socket from assembly
5. Bulb from socket
Install or Connect
1. Bulb into socket
2. Socket into assembly
3. Assembly
4. Two screws
5. License plate
1. ATTACHING NUT
2. LAMP A98EMBLV
Fig. 88-8 Rear Tail/Stop/Turn Signal Lights
REAR TAIL/STOP/TURN SIGNAL LIGHTS
Fig. 8B-8
Replacement Bulb: Trade No. 2057, 32/2
Candlepo wer
Remove or Disconnect
1. Open hatch
2. Fasteners at trim panel
3. Trim panel
4. Wing nuts holding taillight lens
5. Taillight lens
6. Bulb from socket
Install or Connect
1. Bulb into socket
2. Taillight lens
3. Wing nuts
Adjust
Taillight lens for proper appearance before
tightening wing nuts
4. Trim panel
5. Fasteners
6. Close hatch
Fig. 88-9 Rear Sidemarker Lights
SIDEMARKER LIGHTS
Figs. 88-4 (Front) and 8B-9 (Rear)
Assembly Replacement - Front
Remove or Disconnect
1. Six screws from filler panel under front fascia
2. Filler panel
3. Socket from assembly
4. Two retainers
5. Assembly
Install or Connect
1. Assembly
2. Two retainers
3. Socket
4. Filler panel
5. Six screws
Assembly Replacement - Rear
Remove or Disconnect
1. Open hatch
2. Fasteners at trim panel
3. Trim panel
4. Socket from assembly
5. Two nuts
6. Assembly
Install or Connect
1. Assembly
2. Two nuts
3. Socket
4. Trim panel
5. Fasteners
6. Close hatch

LIGHTING SYSTEMS AND HORNS 8B-9
Bulb Replacement - Front
Replacement Bulb: Trade No. 194, 2
Candlepower
Remove or Disconnect
1. Six
screws from filler panel under front fascia
2. Filler panel
3. Socket from assembly
4. Bulb from socket
Install or Connect
1. Bulb into socket
2. Socket into assembly
3. Filler panel
4. Six screws
Bulb Replacement - Rear
Replacement Bulb: Trade No. 194, 2
Candlepower
Remove or Disconnect
1. Open hatch
2. Fasteners at trim panel
3. Trim panel
4. Socket from assembly
5. Bulb from socket
Install or Connect
1. Bulb into socket
2. Socket into assembly
3. Trim panel
4. Fasteners
5. Close hatch
TURN SIGNAL FLASHER
The turn signal flasher is in the convenience
center, behind the instrument panel to the right of the
steering column. To remove the flasher, lift it up and
out.
UNDERHOOD LIGHT
Replacement Bulb: Trade No. 93, 15
Candlepower
Remove or Disconnect
1. Open hood
2. Bulb from socket
Install or Connect
1. Bulb into socket
2. Close hood
HORNS
If the horns do not blow, or blow constantly,
follow the diagnostic procedures in Section
8A.
Fig. 88-10 Horns
Horn Tone Poor
1. Horn Tone Poor - Tighten bolts in mounting
area, or correct poor connections or ground.
2. Low-Pitched
Moan
- Sounds like "mooing."
Caused by current too high. Adjust current (see
the following).
3. Weak Tone - Current too low. Correct poor
connections or ground, or adjust current (see the
following).
.4. Weak, Strained Tone
- Remove foreign
object in horn.
5. Harshvibration-Bendbracketsohornisnot
touching sheet metal.
Current Adjustment
Current draw for a horn while operating should
be 4.5 to 5.5 amperes at 11.5 to 12.5 volts. High current
(more than 20 amperes) indicates an overheated
winding or
shorted horn; replace the horn. A current
reading of about
18 amperes means the contact points
are not opening; adjust the horn current (see the
following).
No current reading indicates a broken
connection, or
an open circuit due to a broken lead or
overheated horn. An overheated horn must be
replaced. No current reading may also mean the
contact points are open; adjust the horn (see the
following).

Adjust 2 . Filler panel 3 . Electrical connector
1 . Increase Current - Turn adjusting screw 4 . ~~l~/~~~~~
clockwise 5 . Horn
2 . Decrease Current . Turn adjusting screw
counterclockwise
Install or Connect
3 . Current adjustments should be made 1/4 turn
(90") at a time
Horn Assembly
Remove or Disconnect
1 . Six screws from filler panel behind front fascia on
driver's side 1
. Horn
2 . Bolt/screw
3 . Electrical connector
4
. Filler panel
5 . Six screws
Horn Relay
The horn relay is in the convenience center.
behind the instrument panel to the right of the steering
column
. To remove the relay. pull it straight out .
REPLACEMENT LIGHT BULBS
For exterior light replacement procedures. see the rest of this
section
. For interior light replacement procedures. see Section $A
and Section 8C .
EXTERIOR LIGHTS Trade No . ...................................................................................................................... Back-up Lights 1 156
Center
High-Mounted Stoplight ............................................................................................. 577
Front Barking/Turn Signal Eights ..................................................................................... 2057
Fog Lights
............................................................................................................................... H-3
Headlights ....................................................................................................................... H6054 ................................................................................................................ License Plate Lights 194
.................................................................................... Rear Tail/Stop/Turn Signal Lights 2057
Sidemarker Lights (Front and Rear) ...................................................................................... 194 ..................................................................................................................... Underhood Light 211
BNTERBOR LIGHTS Trade No .
......................................................................................... Air Conditioner/Heater Controls 194 .................................................................................................................. Ashtray & Lighter 194 .............................................................................................................. Cargo Compartment 561
................................................................................................ Cluster & Speedometer (Tach) 194 ..................................................................................................................... Console Ashtray 194 ............................................................................................................. Console Compartment 194
Courtesy Lights
..................................................................................................................... 194 ......................................................................................................................... Dome Light 561
Gear Selector Indicator
............................................................................................................ 74 .......................................................................................... Headlight High-Beam Indicator 194
Indicator Lights
..................................................................................................... Brake System Warning 194
With Gages
........................................................................................................................ 74
............................................................... Charging System Warning (except Rally Gages) 194 .................................................................................................................... Choke Warning
194
With Gages
........................................................................................................................ 74
...................................................................... Oil Pressure Warning (except Rally Gages) 194 ............................................................................................................ Seat Belt
Reminder 194
With Gages
.................................... ... ................................................................................. 74 ............................................................................................. Service Engine Soon Warning 194
With Gages
..................................................................................................................... 74 ............................................................ Temperature Gage Warning (except Rally Gages) 194
........................................................................................................................ Reading
Light 906 ............................................................................................................ Turn Signal Indicators 194

LIGHTING SYSTEMS AND HORNS 8B-11
2-HORN LEADS 3-SIDE MARKER
4-HEADLAMP
%-TURN SIGNAL PARK LAMP
6-HEADLAMP MOTOR RELAY
7-HEADLAMP MOTOR JUMPER
8 -HEADLAMP ISOLATION RELAY
9- BRAKE PRESS. WARNING SW.
10-TO
SIDE MARKER
11-HORNS
12-TO
HEADLAMP
13-ENGINE HARNESSCONNECTOR
14-BULKHEAD CONNECTOR
15-CONNECTOR END CAP
16-HEADLAMP MOTOR ISOLATION RELAY
Fig. 8B-1 1 Forward Light Wiring