PONTIAC FIERO 1988 Service Repair Manual

EXTERIOR LIGHTS WITH LAMP MONITOR: TAlLIREAR MARKERILICENSE
TO C208, PIN D PAGE 111-3
a -:HE0 RESISTANCES $
TO C205. PIN C
PAGE 111-3 TO 6205. PIN A
PAGE 111-3

1, EXTERIOR LIGHTS WITH LAMP MONITOR: TAILIREAR MARKERILICENSE
GROUND DISTRIBUTION

EXTERIOR LIGHTS WITH LAMP MONITOR I:
TROUBLESHOOTING HINTS
r Try the follovving checks before doing the
Systern Diagnosis .
1 . If neither the Turn Lights nor the Back Up
Lights work. check the TURN
BIU Fuse .
2 . If neither the Stop Lights nor the Hazard
Lights work. check the STOP-HAZ Fuse
.
3 . If only one light does not operate. check bulb.
socket. and related wiring (see schematic)
.
4 . If one of the Turn Indicators goes on when the
Park Lights are turned on. check the Front
Turn Light on that side
.
5 . For any of the following symptoms. replace the
Turn-Hazard Switch:
Some Turn Lights work and all Hazard
Lights work
.
@ Some Hazard Lights work and all Turn
Lights work
.
Hazard Lights do not turn off .
6 . If the Turn Lights stay on (do not flash) in both
TURN LEFT and TURN RIGHT. replace the
Turn Flasher
.
7 . If the Hazard Lights stay on (do not flash) in
HAZARD. but the Stop Lights go off normally.
replace the Hazard Flasher
.
8 . If no Park. Tail. or License Lights work.
check the Light Switch. and the
ORNIBLK
(240) and BRN (9) wires for an open (see
schematic)
.
COMPONENT LOCATION Page-Figure
..... Brake Switch .................... Above brake pedal. on brake pedal support 201- 9-A
......... Convenience
Center .............. Behind IIP. to right of steering column 201-10-A
....... Fuse
Block ...................... Behind LH side of IIP. below light switch 201-10-A
Lights Monitoring Module
......... Behind IIP. at base of steering column
......... Turn Flasher .................... Behind IIP. to right of steering column 201-
9-A
TurnIHazard Switch .............. Top of steering column
.. ClOO (42 cavities) ................ LW front of dash. left of brake master cylinder 201- 0-A
................. C105 (2 cavities) Behind
LH side of IIP. near fuse block
.................. 6205 (3 cavities) ................. Behind LH side of rear seat 201-17-6
.................. ................. C208 (8 cavities) Behind LR side of rear seat 201-17-C
. C210 (11 cavities) ................ Behind IIP. on RH lower side of steering column 201-
9-A
.................... C312 (2 cavities) ................. Behind rear license plate 201-17-A
..... ............. 6103
(Except VIN E) On
radiator support. behind LH headlights 201-16-A
..... .......................... 6104 On
radiator support. behind RH headlights 201-16-A
............ .......................... 6200 Behind IIP. left of steering column 201-10-A
......................... .......................... 6303 Center of end panel 201-17-B
..... ........................... S105 Front lights harness. behind LH headlights 201-16-A
S106
........................... Front lights harness. LH front corner of engine
............................ compartment 201-15-B
..... ........................... S107 Front lights harness. behind LH headlights 201-16-A
..... S109 ........................... Front lights harness. left of RH headlights 201-16-A
.... S110 ........................... Front lights
harness. behind RH headlights 201-16-A
......... S205 ........................... IIP harness. behind
instrument cluster 201-10-A
......... S225 ........................... I/P harness. behind instrument cluster 201-10-A
......... S227 ........................... IIP harness. behind instrument cluster 201-10-A
....... S302 ........................... Rear lights harness. LH side of end panel 201-17-B
S307
........................... Rear lights harness. LH rear corner of cargo
............................ compartment 201-17-B
...... S308 ........................... Rear lights harness. behind LH rear lights 201-17-A
S311
........................... Rear lights harness. left of RW back up lights ... 201-17-A

EXTERIOR LIGHTS WITH LAMP MONITOR 1 g
(Continued from previous page)
9. If the Stop Lights stay on without the brake
pedal pressed,
adjustlreplace the Brake
Switch.
10. If the Park Lights do not
turn off, replace
the Light Switch.
11.
If only the High Level Stop Light does not
work, check the Brake Switch,
High Level
Stop Eight, the LT
BEUIBLK and YEL
(820) wires, and the BLK (150) wires for an
open.
12. If a
Turn Indicator lights steadily (does not
flash) when the Turn
Signal is on, check the
Turn Lights on that side.
Go to System Diagnosis for diagnostic tests.
SYSTEM DIAGNOSIS
@ Diagnostic steps for the symptoms listed in
the following table are listed after the table.
SYMPTOM TABLE
k The Turn Lights do not work, but the
Hazard Lights work
B: The Hazard Lights do not work, but the
Stop Lights and
Turn Lights work
@: The Stop Lights do not work, but the Turn
Signals work
Lights on one or both sides
do not work
E: The Front Turn Light and Wn Indicator
on one or both sides do not light
A: THE TURN LIGHTS DO NOT MRK,
BUT THE HAZARD LIGHTS WORK
Connect: TEST UMP
At: CONNECTOR 6218 (Connected)
Condition:
@ lanition Switch: RUM 1
Correct For Diagnosis
Connect
Result of Incorrect Setween Results
L (PPL) & Test Lamp
See 1 Ground lights
Jf *.he test lamp lights, replace the Turn-
Hazard Switch.
1. Check the Turn Flasher, BIU Fuse,
and the DK
BLU (75) and PPL (16) wires
for
an open (see schematic).
B: THE HAZARD LIGHTS DO NOT WORK,
BUT THE STOP LIGHTS AND BURN
LIGHTS WORK (TABLE 1)
At: CONVENIENCE CENTER (Disconnected)
Conditions:
e Hazard Flasher: REMOVED
* Hazard Switch: HAZARD
Jumper Correct For Diagnosis
Result of
Incorrect
Betvveen Results
B (BRN) & A All
the Turn
I (ORN) I Lights light I See 1 I
If the result is correct, replace the Hazard
Flasher.
1. Go to Table 2.
B: THE HAZARD LIGHTS DO NOT WORK,
BUT THE STOP LIGHTS AND TURN
LlGMTS WORK (TABLE 2)
Connect: TEST WMP
At: CONNECTOR 6210 (Connected1
For Diagnosis
Connect
of incorrect 1 Bemeen I Resun 1
K (BRN) & Test Lamp
Ground lights
If the result is correct, replace the Turn-
Hazard Switch. 1
1. Check the ORN (140) and BRN (27) wires
for an open (see schematic).
C: THE STOP LIGHTS DO NOT WORK
BUT THE TURN SIGNALS WQR:'" -. .-
Connect: TEST EAMP
At: CONNECTOR C208 (Connected1
Condition:
r Brake Pedal: DEPRESSED
Connect Correct
For Diagnosis
Result of
Incorrect
Between Results
B (LT BLU) & Test Lamp
lights See 1 Ground
If the test lamp lights, with Trans Am,
check
WHT (17) wire for an open, then re-
place
TurnJHazard Switch if WHT wire is
good. With Firebird, check
LT BLU (20)
wire for an open (See schematic).
1.
ChecWadjust the Brake Switch, and check
the
WWT (17) and ORN (140) wires for an
open (see schematic).
(Continued on facing page)

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.