PONTIAC FIERO 1988 Service Repair Manual

> HEADLIGHTS WITH LAMP MONITOR :
I
DONOTMEASURE
FROM FOG LIGHT
RELAY PAGE
103-4
DISTRIBUTION
-- - a 6104 - -

HEADLIGHTS WITH LAMP MONITOR
TROUBLESHOOTING HINTS
r Try the following checks before doing the
System Diagnosis.
1. If the Headlight on one side is dimly lit, check
the ground on that side.
2. If the Hi Beam Indicator does not light, but
the High Beams operate, check the LT GRN
(11) wire for an open (see schematic).
3. If one Headlight doesn't work, check the con-
nections, the Headlight, and the wires to the
Headlight.
4. If the Headlights do not turn off, replace the
Light Switch.
Go to the System Diagnosis for diagnostic
tests.
SYSTEM DIAGNOSIS
0 Do the Tests listed for your Symptom in the
Symptom Table below.
@ Tests follow the Symptom Table.
SYMPTOM TABLE
I SYMPTOM I FOR DIAGNOSIS I
All Headlights
inoperative or
intermittent Do
Test A
Beam Indicator are
(Continued in next column)
COMPONENT LOCATION Page-Figure
Headlight Dimmer Switch.
........ Behind IIP, on LH upper side of steering column. 201-
9-A
Lights Monitoring Module.
........ Behind IIP, at base of steering column
.. el00 (42 cavities) ................ LH front of dash, left of brake master cylinder
201- 0-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
.... S107. .......................... Front lights harness, behind LH headlights.
201-16-A
.... S110. .......................... Front lights harness, behind RH headlights
201-16-A
S151. .......................... Front lights harness, lower LH side of engine
compartment
............................ 201-16-A
........ S205. .......................... IIP harness, behind instrument cluster. 201-10-A
............ S230. .......................... IIP harness, behind LH side of IIP 201-10-A
............... S231. .......................... IIP harness, above Fuse Block. 201-10-A
(Continued from previous column)
A Headlight is out,
but no warning
message is displayed
on the Instrument
Panel
A: LIGHT SWITCH TEST (TABLE 1)
At: LIGHT SWITCH CONNECTOR
(Connected)
Condition: Light Switch: HEAD
Refer to Driver
Information Center
(DIC), page 86-0
A Headlight out
warning message is
displayed but all
Headlights are
functioning properly For Diagnosis
Connect
Correct Result Of Incorrect
1 Between 1 1 Results 1
Refer to Driver
Information Center
(DIG), page 86-0
I Ground (RED) I Te;ik,",mp I see 1 I
If both results are correct, go to Test B.
1. Check Fusible Link A and RED (2) wire for
an open.
D (YEL) &
Ground Test Lamp
lights Go to able

HEADLIGHTS WITH LAMP MONITOR
A: LIGHT SWITCH TEST (TABLE 2) (Continued from previous column)
With the Headlight D er
Switch in HI,
Connect: FUSED JUMPER
At: LIGHT
SWITCH CONNECTOR
(Disconnected)
Conditions:
@ Put a 15 amp fuse in the fused jumper
@ Dimmer Switch: LO
( C (RED) & D ( Headlights 1 See (YEL) light I
Jumper
Betvveen
I Put Dimmer Switch in HI I
Correct Result
I 0 If results are correct, replace Light Switch. I
For Diagnosis
Of incorrect
Results
C (RED) & D
(YEL)
1. Check for short to ground in wiring to
I Headlights.
B: DIMMER SWITCH TEST
High Beams
light
Connect: TEST LAMP
At: HEADLIGHT DIMMER SWITCH
COIUNEC-
TOR (Connected)
Conditions: Light Switch: HEAD
@ Dirnmer Switch: LO
See 1
(Continued in next column)
For Diagnosis
Correct
~esu~t Of incorred
1 1 1 Resd% 1
C(YEL)& TestLamp
Ground lights See 1
Ground I
Put
Dimmer Switch in HI
B (LT GRN)
& Test Lamp
lights See 2 Ground
If all results are correct, check wiring to
lights for an open.
1. Check YEL (10) wire for an open.
2. Replace Headlight Dimmer Switch.
CIRCUIT OPERATION
Voltage is applied to the Light Switch
through the Headlights Circuit Breaker. When
the switch is closed in HEAD, voltage is
applied through the YEL wire to the Headlight
Dimmer Switch. With the
D
LO, voltage is applied through the TAN and
BLK matched resistance wires to the Lights
Monitoring Module and to the LH and RH Low
Beam Headlights. The Lo Beam Headlights
turn on.
If either of the Lo Beam Headlights is burned
out, the Lo Beam Comparator detects the open
low beam filament, and the Driver Information
Center (DIC) displays the fault. voltage
is applied through the
LT GRN wire
and the matched resistance wires to the Lights
Monitoring Module and to the LH and
RH Hi
Beam Headlights. The Hi Beam Headlights
turn on. Voltage is also applied through the LT
GRN wire to the Hi Beam
In&cator. The In&-
cator lights whenever voltage is applied to the
high beams.
If either of the Hi Beam Headlights
is burned
out, the Hi Beam Comparator detects the open
high beam filament and the Driver Information
Center (DIC) displays the fault.

HEADLIGHTS WITH LAMP MONITOR: FOGLIGHTS

-. 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