1988 PONTIAC FIERO lights

EXTERIOR LIGHTS WITH LAMP MONITOR
(Continued from facing page) E: THE FRONT TURN LIGHT AND TURN -- - INDICATOR ON ONE OR BOTH SIDES D: THE REAR TURN LIGHTS ON ONE OR
DO NOT LIGHT BOTH SIDES DO NOT WORK
Connect: TEST LAMP
At: CONNECTOR C210 (Connected)
Condition:
* Brake Pedal: DEPRESSED
GlRGUlT OPERATION
Connect
Bemeen
M (YEL) &
Ground
N
(DK GRN) &
Ground
Connect: TEST LAMP
At: CONNECTOR
6210 (Connected)
Conditions:
Hazard Switch: HAZARD
* Brake Pedal: DEPRESSED
Turn Lights
With the Ignition Switch in RUN, BULB TEST,
or START, voltage is applied through the TURN
B/U Fuse and the Turn Flasher to the TurnIHaz-
ard Switch. With the switch in TURN LEFT, volt-
age is applied to the
LH Turn Lights and Turn
Indicator. The current through the bulbs heats
the Turn Flasher. It opens and closes to flash the
left turn lights.
Connect
Between
H (LT BLU) &
Ground
J (DK BLU) &
Ground
Stop Lights
Voltage is applied directly from the Brake
Switch to the High Level Stop Light when the
Brake pedal is depressed.
The lower Stop Lights receive voltage
through the WHT wire that feeds the
Turn1
Hazard Switch. With the switches in the posi-
tions shown in the schematic, the WNT wire is
connected through the
Turn Switch and the
YEL and
DK GRN wires to the Stop Lights.
They come on when the Brake Switch is closed.
r If both results are correct, check the YEL
(18) or DK GRN (19) wire for an open.
1. Replace the Turn-Hazard Switch.
Correct
Result
Test Lamp lights
Test Lamp
lights
Front Marker Lights
The Front Marker Lights can be lit by either
the Park Lights or the Turn Lights. Neither of the
two wires to each of the marker bulbs is a ground
wire.
For Diagnosis
of Incorrect
Results
See 1
See 1
If both results are correct,check the LT BLU
(14) or DK BLU (15) wire for an open (see
schematic).
1. Replace the Turn-Hazard Switch.
Correct
Result
Test Lamp lights
Test
Lamp
lights
With the Park Lights on, battery voltage is
supplied through the BRN wires to both
Marker Lights. The path to the ground for the
marker bulbs is through the Turn Lights. The
small Marker Light bulbs light up, but not the
larger turn bulbs.
When the Turn Lights are on, but not the
Park Lights, battery voltage is applied through
the BLU wires to the Marker Lights. They glow
since they are grounded through the entire Park
Light system. As before, the small marker
bulbs light up, but not all the parking bulbs.
For Diagnosis
of Incorrect
Results
See 1
See 1
The right turn lights operate in a similar way
when the turn light switches are closed to the
right.
(Continued on next page)

EXTERIOR LIGHTS WITH LAMP MONITOR
(Continued from previous page)
If both the Park Lights and a set of Turn Lights
are on at the same time, the marker bulb for that
side will not light up. With battery voltage on
both sides of a bulb, it will not glow. When the
Turn Lights flash off, however, the marker bulb
on that side will come on since it is now grounded
through the Turn Lights. This circuit makes the
turn and marker bulbs flash out of step with each
other when the Park Lights are on.
Park, Tail, Marker, and License Lights
Voltage is applied at all times through the
Tail Fuse to the Light Switch. When the switch
is closed, voltage is applied to the Exterior
Lights.
All the Front Park and Marker Lights,
Rear Marker Lights,
Tail Lights, and License
Lights light.
If one of the Front Park Lights is burned out,
the Park Light Comparator detects the open park
light filament, and the Driver Information Cen-
ter
(DIC) displays the fault. Similarly, if one of the
Tail Lights is burned out, the Tail Lights Com-
parator detects the open filament, and the Driver
Information Center (DIC) displays the fault.
If a Tail Light is burned out on both sides of the
vehicle for the same comparator in the Lights
Monitoring Module, the module will not detect
the malfunction. The Driver Information Center
will not display the fault. The module will react
the same if both Front Park Lights are burned
out.

BACK UP LIGHTS 1:
WITH DIGITAL CLUSTER I .a
.l LT GRN I I .8 LT GRN AUTOMATIC
"i
DAY-NIGHT 24 MIRROR
.8 BLK 1150
1 3BLK GROUND
DISTRIBUTION

a BACK UP LIGHTS
WITHOUT DIGITAL CLUSTER
.I LT GRN 124 .8 LT GRN AUTOMATIC 0AY.NIGHT 24 MIRROR
1 .8 LT GRN
RH
- BACK-UP -
.8 BLK
S308
.8 BLK 1150
I 3 BLK GROUNO
DISTRIBUTION

BACK UP LIGHTS
TROlJBLESHQOTlNG HINTS COMPONENT LOCATION Page-Figure
Try the following checks before doing the Back Up Switch ................. On LN side of transmission. ................. 201- 8-F
System Check. Fuse Block. ..................... Behind LH side of IIP, below light switch. ...... 201-10-A
............. ............ 1. Check the TURN BIU Fuse by operating the Gear
Selector Switch In
console, at base of gear selector
201-11-E
.................... Flasher. Flasher Behind IIP, to right of steering column. ........ 201- 9-A
2. If only one Back Up Light does not operate,
check bulb, socket,
and related
3. If the Back Up Lights go on or off in the
mong gear, adjust the Gear Selector (Auto-
matic) or Back Up (Manual) Switch.
el00 (42 cavities) ................ LR front of dash, left of brake master cylinder ..
C208 (8 cavities) ................. Behind LH side of rear seat. .................
6303 .......................... Center of end panel. ........................
S229. .......................... IIP harness, behind LH side of IIP ............
S302. .......................... Rear lights harness, LH side of end panel. ......
S308. .......................... Rear lights harness, behind LH rear lights. ..... - - Go to System Check for a guide to normal S3 11. .......................... Rear lights harness, left of RN back up lights
201-17-A ...
operation.
Go to System Diagnosis for diagnostic tests.
SYSTEM DlAGRlOSlS A: BACK UP LlGHTS DO NOT OPERATE
SYSTEM CHECK
Diagnostic steps for the symptoms listed in
Use the System Check Table as a guide to
the following table are listed
aMer the table. WlTCH (Automatic) or
normal operation. BACK
UP SWITCH
(Manual)
Refer to System Diagnosis for
a list of symp-
toms and diagnostic steps.
SYSTEM CHECK TABLE
the Ignition
Switch to RUN, and
move the Gear Shift
to
any gear except
REVERSE
Move the Gear Shift Back Up Lights come
to REVERSE 1 on - -
Move the Gear Shift Back
Up Lights go off
to any gear except
REVERSE
Refer to System Diagnosis when a result is
SYMPTOM TABLE
A: Back Up Lights do not operate
B: Back Up Lights light in PARK or NEU-
TRAL
(Continued on facing page)
not normal. Between
I Voltage I Diagnosis
I DKBLU& I Battery I See l I Ground

BACK UP LIGHTS
1. Check DK BLU (75) wire and the TURN
B: BACK UP LlGHTS LIGHT IN PARK OR
NEUTRAL
Remove the connector from the Gear Selec-
tor Switch (Automatic) or Back Up Switch
(Manual).
If the Back Up Lights go out, adjustlreplace
the Gear Selector Switch or Back Up Switch
as necessary.
If the Back Up Lights do not go out, check
LT GRN
(24) wires and sockets for a short to
battery voltage.
CIRCUIT OPERATION
With the Ignition Switch in RUN, BULB
TEST or START, voltage is applied through
the TURN
BIU Fuse to the Gear Selector
Switch (with Automatic Transmission), or to
the Back Up Switch (with Manual Transmis-
sion). Whenever the gear selector lever is
s&&ed to REVERSE, the Gear Selector Switch
or the Back Up Switch closes, and voltage is
applied to the Back Up Lights.

-. INTERIOR LIGHTS: DOME/READING/COURTESY/GLOVE BOX AND CIGAR LlGHTER 00 b
I ..a
.8 ORN
- - -

INTERIOR LIGHTS: CARGO COMPARTMENT LIGHT
COMPARTMENT
.8 WHT 156