1988 PONTIAC FIERO turn signal

M: WNEL LIGHT TEST GlRGUlT OPERATION Subwoofer Speaker System
TOR 61 (Disconnected)
If the voltage is correct, remove Radio for
N: DISPLAY DIMMING TEST
TOW 62 (with Subwoofer
The Radio Fuse provides power to the Radio
and to the Power Antenna. With the Ignition
Switch in ACCY or RUN, voltage is applied
through the Radio Fuse and the
UEL wire to
the On-Off Switch in the Radio. The circuit is
grounded at 6200. With the On-Off Switch
closed, voltage is applied from the Radio Fuse
to the Radio Switch (Power Antenna), and the
solid state Radio Circuits to ground. Two wires
connect each speaker to the Radio.
The ETR Radio has two inputs that other
models do not have; Display Dim Signal and
ClocklMemory.
The ETR model is an AMIFM Radio that
changes stations electronically. The frequency
of pre-selected stations can be stored
in the
electronic memory. The ETR model also
provides a digital display of time or station
frequency. As in other models, the Light Switch
controls Panel Light dimming. In the
ETR
model, g is also controlled by the Radio
itself by means of the Dim Display Input
Signal.
The ETR model's clock memory and Radio
memory functions are powered at all times
through the CTSY Fuse or through the ARC
RADIO Fuse if equipped with the Remote
Control Head. If power to the ETR model is cut
off by disconnecting the Battery, for example,
the operator must reset the memory functions
when power is restored. The
Subpower Speaker
System consists of a
Subwoofer Amplifier Assembly and two Sub-
woofers. The Amplifier receives power from the
Radio PNK
(143) wire and is grounded at 6200.
The Amplifier Switch is located in the
Sub-
woofer Switch which, when put in the ON posi-
tion, causes the Subwoofer Amplifier to
operate. The eight audio inputs from the
I/P
Speakers and Rear Speakers are sent to the
Subwoofer Amplifier which then outputs an
audio signal to the Subwoofers.
Remote Radio System
The Remote Radio System consists of a mul-
tifunction Remote Control
Head and Data
Transmitter located in the steering wheel, a Slip
Ring and a rotating optical data link in the
steering
colurnn, and an ARC Radio equipped
with a serial data port for remote control.
Power for the electronics is supplied from the
RADIO Fuse, through the
YEL (43) wire,
through the slip ring to the Control Head. The
ground (the
BLKLT BLU (15 1) wire) and Pand
Larnps Power (the GRY (8) wire) are Likewise
supplied to the Control Head through the Slip
Ring assembly.
The Remote Control Head controls the Radio
by generating a unique data word for each oper-
ating function when the button controlling that
function is pressed. The data words are con-
verted from an electronic signal to an optical
signal by the Light Transmitter in the steering
column Cancel Cam. The light signal then
crosses the air gap to the Light Receptor
located in the
Turn Signal Switch where it is
reconverted to
an electronic signal. This signal
is then routed via wire to the Radio, which
responds to the Control signal.

LIGHTING SYSTEMS AND HORNS 8B-I
SECTION 8B
NG SYSTEMS AND HORNS
CONTENTS
........................... GENERAL DESCRIPTION 8B-1
Exterior Lights
....................... ................... Back-up Lights .. 8B- 1
Center High-Mounted Stoplight .................... 8B-1
Exterior Light Monitor .................................. 8B-1
............................ .................... Fog Lights .. 8B-1
Front Parking/Turn Signal Lights ................ 8B-2
............................... Hazard Flashers .. ........ 8B-2 .................................................... Headlights 8B-2
License Plate Lights ..................................... 8B-2
Light Switch ............................................... 8B-2
............... Rear Tail/Stop/Turn Signal Lights 8B-2
Sidemarker Lights ........................................ 8B-2
Turn Signals .......................................... 8B-2
......................... Underhood Light ... ........ 8B-2
Horns .......................................................... 8B-3
....................................... ON-CAR SERVICE 8B-3
Exterior Lights
............................................. Back-up Lights 8B-3
Center High-Mounted Stoplight .................... 8B-3
Fog Lights .................................................... 8B-4
Front Parking/Turn Signal Lights ................ 8B-4
Hazard Flasher .............................................. 8B-5
....................................................... Headlights 8B-5
License Plate Lights ..................................... 8B-7
............... Rear Tail/Stop/Turn Signal Lights 8B-8
.......................................... Sidemarker Lights 8B-8
................... ............... Turn Signal Flasher .. 8B-9
......................................... Underhood Light 8B-9
Horns ................................................................. 8B-9
REPLACEMENT BULB
.................................... SPECIFICATIONS 8B- 10
The following information, previously shown in this section,
has been moved to the sections shown.
Back-up Lights Switch
............................. ... ............................................................................ 7
................................................................................................................................. Fuse Block 8A
Ignition Switch ........................................................................................................................... 3B
Interior Lights
................................................................................................................... 8A, 8C
Neutral Start Switch ..................................................................................................................... 7
Parking Brake Warning Switch
......................... ... .................................................................... 5
........................................................................ Seat Belt, Key and Headlight Warning Alarm 8A
Stoplight Switch .......................... .. ............................................................................................... 5
Windshield
Wipers/Washers .................................................................................................... 8E
GENERAL DESCRIPTION
The exterior lighting system includes the
headlights (and headlight motors to raise or lower the
headlights), front
parkinghurn signal lights, front
cornering lights, fog lights, rear
tail/stop/turn signal
lights, back-up lights, license plate lights, center
high-mounted stoplight, and the underhood light; it
also includes all associated wiring, controls and related
hardware for these lights.
BACK-UP LIGHTS - The back-up lights are
next to the rear license plate. They will come on when
the transmission is shifted to Reverse. On cars with an
automatic transmission, the back-up lights are
activated by the neutral start switch. On cars with a
manual transmission, they are activated by a separate
back-up light switch on the transmission. For more
information, see Section 7.
CENTER HIGH-MOUNTED STOPLIGHT-
The center high-mounted stoplight, in the center of the
rear spoiler, will come on whenever the brake pedal is
pushed down. The light is powered separately from the rear
tail/stop/turn signal
lights through a separate
circuit in the stoplight switch (see Section
8A).
EXTERIOR LIGHT MONITOR - The Driver
Information Center, on cars so equipped, also monitors
certain front and rear lights. When a bulb burns out,
the message
"FRONT LAMP" or "REAR LAMP"
will appear in the DIC display, and a light will come
on to indicate which bulb has burned out. For more
information, see Section
8A.
FOG LIGHTS -The fog light switches are to the
left of the steering column on the edge of the
instrument panel. To use the fog lights, first turn on the
headlights or parking lights. Then, push the middle
switch (with the fog light symbol) to turn on the fog
lights. Push the left
("OFF") switch to turn off the fog
lights.
The fog lights should not be used as a substitute
for the headlights.
Switching to high-beam headlights will turn off
the fog lights; switching back to low-beams will turn
the fog lights on again.

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

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).