Pontiac Fiero 1988 Service Manual page 1044

REAR DEFOGGER: C49
TROUBLESHOOTING HINTS
• Try the following checks before doing the
System Check.
1. Check the GAGES Fuse by leaving the key
in the ignition, opening the driver's door,
and observing that the key warning chime
sounds.
2. Check the PWR ACC Circuit Breaker by
operating the Power Door Locks (if
equipped).
3. Check grounds G303 and G203 to make sure
they are clean and tight.
4. If the symptom only involves the time that
the Rear Defogger operates, replace the
Defogger Timer-Relay.
5. If the problem is panel illumination, see Inte-
rior Lights Dimming, Section 8A-117.
• Go to System Check for a guide to normal
operation.
© Go to System Diagnosis for diagnostic tests.
S Y S T E M CHECK
• Use the System Check Table as a guide to
normal operation. Refer to the diagnosis
given if other results occur.
• Tests follow in System Diagnosis.
COMPONENT LOCATION
Page-Figure
Defogger Timer Relay On brake pedal support 201- 6-E
Fuse Block Behind LH side of I/P 201- 6-D
C200 (16 cavities) LH shroud ahead of center access hole 201- 6-D
C302 (1 cavity) Near LH side of rear window 201-13-B
G203 On RH steering column support 201- 6-F
G303 On RH "B" pillar
S Y S T E M CHECK TABLE
ACTION
NORMAL RESULT
FOR DIAGNOSIS
OF OTHER RESULTS
1. Turn the Ignition Switch to
RUN, and depress the
Defogger Control Switch
The switch button returns to
the rest position, and the ON
Indicator in the center of the
Defogger Control lights
The Defogger grid removes fog
from the rear window
The ON Indicator and the Rear
Defogger turn off after approxi-
mately 10 minutes
Do Test A
Do Test B
Do Test C
Replace the Defogger Timer-
Relay
2. Depress the Defogger Con-
trol Switch again
The ON Indicator and the Rear
Defogger turn on, and after
approximately 5 minutes, they
turn off
Replace the Defogger Timer-
Relay
3. Depress the Defogger Con-
trol Switch, and immedi-
ately press the Defogger
Control Switch again
The ON Indicator and the Rear
Defogger turn on, and then
turn off
Do Test A
• 1 all results are normal, the system is OK.
(Continued on next page)