PONTIAC FIERO 1988 Service Repair Manual

AIR CONDITIONING: AIR DELIVERY
(Continued from previous page)
Temperature Valve
The Temperature Valve is positioned by the
A/C Temperature Valve Motor which is con-
trolled by the Temperature Selector. When the
Temperature Selector is moved to the COLD
position, battery voltage is applied to the Con-
trol Input of the
AIC Temperature Valve Motor
on the YEL
(996) wire. The circuits in the Ale
Temperature Valve Motor cause the motor to
move the Temperature Valve to the COLD posi-
tion which blocks all air from passing through
the Heater Core.
As the Temperature Selector is moved from
the COLD to ROT position, the voltage at the
control input of the
AIC Temperature Valve
Motor drops to about
0.3 volts at the HOT
position. The changing voltage level causes the
motor to move the valve to the position corre-
sponding to the setting of the Temperature
Selector.
Outside Air Valve
The Outside Air Valve determines whether
air will be drawn from the outside air inlet or
from inside the car. The valve is in position
B
(see schematic) in all modes except MAX, per-
mitting outside air to enter. In the MAX Mode,
the Outside Air Solenoid is energized applying
vacuum to the Outside Air Vacuum Actuator
which moves the valve to position A. Air from
inside the car is then recirculated to get max-
imum cooling from the
air conditioning system.
Heater Water Bypass Valve
In all operating modes except MAX, engine
coolant circulates through the heater core to
heat the
air from the Blower. When the MAX
Mode is selected, the
Neater Water Bypass
valve is operated by the Outside Air Vacuum
Actuator.
HeatIDefrost Valve
With the system OFF, or with the BI-LEVEL
or HEATER Modes selected, vacuum is
applied to the
AIC Defrost Vacuum Actuator.
The bellows contract and the
HeatIDefrost
Valve moves to B position. Most of the air flows
out of the
Footwell Air Outlets. In all other
Modes no vacuum is applied to the Vacuum
Actuator and the
HeatIDefrost Valve remains
in position A forcing most of the air out of the
Windshield Air Outlets.
Upper and Lower Mode Valves
The two Mode Valves determine the amount
of
air flow to the Instrument Panel Air Outlets.
When the Mode selected is MAX, NORMAL or
VENT, vacuum is applied to both the Upper
and Lower Mode Vacuum Actuators. Both
valves then move to position
B and all air flows
out the Instrument Panel Air Outlets. In the
BI-LEVEL mode,
vacuumis applied only to the
Lower Mode Vacuum Actuator which moves the
Lower Mode Valve to position
B. The Upper
Mode Valve moves to position
A. In these posi-
tions some air flows out of the Instrument
Panel Air Outlets and the rest flows out the
Footwell Air Outlet. In HEATER, DEF and
OFF no vacuum is applied to either Vacuum
Actuator and both valves move to position A.
AU. air then flows to either the Footwell Air
Outlets or the Windshield Air Outlets depend-
ing on the position of the
NeatIDefrost Valve.

WARNINGS AND ALARMS: CHIME l e

WARNINGS AND ALARMS: CHIMES
TROUBLESHOOTING H lNTS
* Try the following checks before doing the
System Check.
1. Check the STOP HAZ Fuse by observing
the Hazard Lights Operation.
2. Check the GAGES Fuse by observing the
BRAKE Warning Indicator with the Park
Brake applied and the Ignition Switch in
RUN.
3. Check 6200 by operating the Cigar Lighter.
4. If the FASTEN BELT chime reminder and
indicator operate continuously, replace
Audio Alarm Assembly.
5. If the Park Lights are operating normally
and only the Lights-On reminder operates
incorrectly, replace the Audio Alarm Assem-
bly.
Go to System Check for a guide to normal
operation.
Go to System Diagnosis for diagnostic tests.
SYSTEM CHECK
* Use the System Check Table as a guide to
normal operation.
COMPONENT LOCATlON Page-Figure
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
Ignition Key Warning Switch
...... Upper part of steering column
Seatbelt Switch. ................. In driver's seatbelt buckle
C210
(11 cavities) ................ Behind IIP, on RH lower side of steering column. 201-
9-A
6325 (1 cavity) .................. At LH door sill, base of center pillar
6200 .......................... Behind IIP, left of steering column ............ 201-10-A
S204. .......................... IIP harness, behind instrument cluster. ........ 201-10-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
SYSTEM CHECK TABLE
ACTION
Sit in the driver's
seat and close the
driver's door
Turn the Ignition
Switch to RUN
Do not buckle the
seatbelt
NORMAL RESULT
A slow chime alarm
sounds
The FASTEN
BELTS Indicator
lights in the
Instrument Cluster
The chime stops and
the indicator shuts
off after 4 to
8
(Continued from previous column)
buckle
seatbelt
ignition, open the
LH front door
I seconds
(Continued in next column)
(Continued on facing page)

WARNINGS AND ALARMS: CHIMES I
(Continued from facing page) (Continued from previous column) B: KEY IN IGNITION INPUT TEST
e Refer to System Diagnosis when a result is
not normal.
SYSTEM DIAGNOSIS
Do the tests listed lor your symptom in the
Symptom Table below.
e Tests follow the Symptom Table.
SYMPTOM TABLE
SYMPTOM DO TEST I
1 None of the Alarms 1 A: Audio Alarm I
(Continued in next column)
A: AUDIO ALARM ASSEMBLY TEST
At: CONVENIENCE CENTER
e Audio Alarm Module Removed
The FASTEN BELTS
chime reminder oper-
ates when the
Seatbelt
is buckled
The FASTEN BELTS
Indicator does not op-
erate, but the
FAS-
TEN BELTS chime
operates
The FASTEN BELTS
Indicator is always on,
but chime operates
properly
Only the Lights-On
Reminder does not
operate
Connect Correct
Between
I Result Diasnosis
C: Fasten Belts
Input Test
D: FASTEN
BELTS Indicator
Test
D: FASTEN
BELTS Indicator
Test
E: Lights-On In-
put Test
If all results are correct and all the
chime functions were not working, re-
place the Audio Alarm Assembly.
1. Check the ORN (140) wire.
2. Check the BLK/WHT (150) wire for an
oDen to ground.
At: CONVENIENCE CENTER
LT GRN (80) and TAN (159) wires for an
open (see schematic).
2. Check Ignition Key Warning Switch and
LT GRN (80) wire for a short to ground
(see schematic).

WARNINGS AND ALARMS: CHIMES
6: FASTEN BELTS INPUT TEST
At: CONVENIENCE CENTER
Ignition Switch: RUN
If the above results are correct, replace
the Audio Alarm Assembly.
Buckle
LH Front
Seatbelt
1. Check PNKIBLK (39) wire for an open.
2. Check the Seatbelt Switch, and BLK (238)
wire for an open (see schematic).
3. Check BLK (238) wire for a short to
ground. If wire is OK, replace the
Seat-
4: FASTEN BELTS INDICATOR TEST
See E (PNKIBLK)
& H (BLK)
Connect: FUSED JUMPER
At: CONVENIENCE CENTER
Condition:
a Audio Alarm Assembly Removed
Connect Correct For
Between Result Diagnosis
Test Lamp
off If
the indicator response was correct, re-
place the Audio Alarm Module.
1. Checklrepair the bulb, the YEL (237)
wire, the BLK (150) wires, and the In-
strument Cluster printed circuit for
opens.
2. Check the Instrument Cluster Printed
Circuit for
a short to Battery.
E: LIGHTS-ON INPUT TEST
At: CONVENIENCE CENTER
0 Audio Alarm Module Removed

WARNINGS AND ALARMS: CHIMES
GlRGUlT OPERATION
The Warnings and Alarms System sounds a
chime to bring attention to one or more of
several conditions. These conditions are:
1) the
lights are on and the Ignition Switch is not in
RUN, BULB TEST, or START;
2) the Igni-
tion key is in the Ignition Switch when the
driver's door is open; and
3) the seatbelt is un-
buckled when the Ignition Switch is in RUN,
BULB TEST, or START.
Voltage is applied at all times through the
STOP
HAZ Fuse to terminal B, to power the
solid state Audio Alarm Assembly.
IGNITION KEY VVARNING
Voltage is applied to the Audio Alarm As-
sembly by the STOP HAZ Fuse. Whenever the
key is in the Ignition Switch and the Ignition
Switch is in LOCK, OFF, or ACCY with the
driver's door open, terminal C of the module is
grounded. This sounds the alarm.
LIGHTS-ON WARNING
When the Light Switch is in HEAD or
PARK, voltage
is applied to the Audio Alarm
Assembly. When the Ignition Switch
is in
RUN, BULB TEST, or START, voltage is
applied through the Gages Fuse to the module.
These two voltages are sensed and the alarm is
not sounded.
When the Ignition Switch is not in RUN,
BULB TEST, or START, the Gages Fuse loses
voltage. The Audio Alarm Assembly senses the
change. If voltage is still available from the
Light Switch, the Lights-On Warning alarm
will sound. The alarm can be turned off by
turning the Light Switch to the OFF setting.
The module no longer senses voltage from the
Light Switch, so the alarm does not sound.
SEATBELT WARNING
With the Ignition Switch in RUN, BULB
TEST, or START, voltage is applied through
the Gages Fuse to the Audio Alarm Assembly.
With the driver's
seatbelt unbuckled, terminal
H of the module is grounded through the Seat-
belt Switch. The FASTEN BELTS Indicator
always goes on for about
5 seconds when the
Ignition Switch is set to RUN, BULB TEST,
or START. The Fasten Belts Chime, however,
only sounds if the
seatbelt is unbuckled and
the Ignition Switch
is in RUN, BULB TEST
or START

a INSTRUMENT PANEL: GAGES CLUSTER
INDICATORS
SEE GROUND DISTRIBUTION

-0 INSTRUMENT PANEL: GAGES CLUSTER
INDICATORS, ILLUMINATION
INTERIOR LIGHTS DIMMING
(V8 VIN F) MULTI-PORT
FUEL INJECTION (V6 VIN S) THROTTLE BODY
INJECTION (V8 VIN E)
- -
CIRCUIT