1988 PONTIAC FIERO Service Repair Manual

-. HEADLIGHTS WITH LAMP MONITOR: FOGLIGHTS
HEADLIGHT
DlSTRlBTUlON

HEADLIGHTS WlTH LAMP MONITOR: FOG LIGHTS
TROUBLESHOOTING MINTS
0 Try the following checks before doing the
System Diagnosis.
1. Check that the Headlights and Park Lights
work properly before troubleshooting the Fog
Lights.
2. If one Fog Light doesn't work, check the Fog
Light, connections, and wires to the Fog
Light.
3. If the Fog Light Switch is not illu
when the Park Lights are on, check the
GRU
(8) wire.
4.
If the FOG LIGHTS ON Light and the
Panel Light do not operate, check the BLK
(150) wire for an open.
Go to System Diagnosis for diagnostic tests.
SYSTEM DIAGNOSIS
Do the test below if the Fog Lights do not
operate.
FOG LIGHTS DO NClT OPEWTE
Measure: VOLTAGE
At: FOG
LIGHT RELAY CONNECTOR
(Disconnected)
Conditions:
r Light Switch: PARK
Fog Light Switch:
ON
Measure Correct
For Diagnosis
Belvveen
COMPONENT LOCATION Page-Figure
................. Fog Light Relay LH front
of engine compartment, on fender. .... 201-16-A
..................... Fuse Block. Behind
LH side of IIP, below light switch. ...... 201-10-A
Fusible Link A (VIN
E) ........... Lower RN side of engine, at Starter Solenoid. ... 201- 2-A
Fusible Link A (VIN F) (VIN 8)
..... Lower RH side of engine, at Starter Solenoid. ... 201- 6-B
Fusible Link A (VIN S). ........... Lower RH side of engine, at Starter Solenoid. ... 201- 1-A
.................. Fusible Link D Front lights harness, near LH side of dash. ..... 201-16-A
.................. Fusible Link E. Front lights harness, near LH side of dash. ..... 201-16-A
.................. Fusible Link G Front
lights harness, near LK side of dash. ..... 201-16-A
................. Remote Dimmer RH side of steering column, on IIP retainer ..... 201-10-A
................ el00 (42 cavities) LH front
of dash, left of brake master cylinder .. 201- 0-A
.................. 6103 (1 cavity). In
front lights harness, LH rear corner of engine
.......................... compartment.. 201-15-C
................. 6213 (3 cavities) Behind LH side
of IIP, near light switch. ....... 201-10-C
6103 (Except VIN E) ............. On radiator support, behind LK headlights. .... 201-16-A
.......................... 6104 On radiator support, behind RH headlights. .... 201-16-A
.......................... ............ 6200 Behind IIP, left of steering column 201-10-A
.......................... S105. Front lights harness, behind LH headlights. .... 201-16-A
.......................... S107. Front lights harness, behind LH headlights. .... 201-16-A
.......................... S110. Front lights harness, behind RH headlights .... 201-16-A
S165. .......................... Forward lights harness, LH front comer of
...................... engine compartment 201-15-B
.......................... S204. I/P harness, behind instrument cluster. ........ 201-10-A
.......................... S225. I/P harness, behind instrument cluster. ........ 201-10-A
.......................... ............... S236. IIP harness, below light switch 201-10-A
(BRNIWNT)
& Ground
(FOG LIGHTS DO
NOT OPERATE continued
on next page)
Battery
See
1

HEADLIGHTS WITH LAMP MONITOR: FOG LIGHTS
I7
(FOG LIGHTS DO NOT OPERATE continued
When the Fog Light Relay is energized, volt-
from previous page)
age is also applied to the FOG LIGHTS ON
Light in the Fog Light Switch. The FOG
LIGHTS ON Light is ated.
If the Park Lights are on, voltage is applied to
the Panel Light in the Fog Light Switch. The
light turns on.
CIRCUIT OPEWTIOIU
The Fog Lights are controlled by the Light
Switch. They can be turned on with the Park or
Headlights on. With the Hi Beams on, the Fog
Lights go out.
The Fog Light Relay controls battery voltage
'to the Fog Lights. The Fog Light Switch applies
voltage to the relay coil. The relay coil is
grounded through the Hi Beam filaments. When
the Hi Beams come on, battery voltage is at both
sides of the relay coil. The relay and the Fog
Lights turn off.
A
(BRNJWHT)
& C (DK
GRNIWHT)
D
(REDIWHT)
& Ground
D
(REDIWHT)
& B (PPL)
If all voltages are correct, replace the Fog
Light Relay.
1. Check the Fog Light Switch and BRN (9)
and
BRNIWHT (909) wire for an open (see
schematic).
2. Check DK GRNIWNT (711) wire for an
open.
3. Check Fusible Link G and REDJWHT (2)
wire for an open.
4. Check PPL (34) wire for an open.
Battery
Battery
Battery See
2
See 3
See 4

EXTERIOR LIGHTS: TURNIHAZARDIFRONT PARKIFRONT MARKERISTOPIHIGH LEVEL STOP LIGHT

EXTERIOR LIGHTS: TURN/HAZARD/STOP
TRANS AM
FROM C210, PIN M PAGE 110-0 FROM
C210, PIN N
PAGE 110-0

EXTERIOR LIGHTS: TURNIHAZARDISTOP I
FROM C210, PIN M
PAGE 110-0 FROM BRAKE SWITCH PAGE 110-0 FROM C210, PIN N PAGE 110-0

EXTERIOR LIGHTS: TAILIREAR MARKERILICENSE
TRANS AM