1988 PONTIAC FIERO radio

TROUBLESHOOTING HINTS
Try the following checks before doing the Sys-
tem Check
.
1 . Check RADIO Fuse .
2 . Check CTSU Fuse or check ARC RADIO
Fuse (if equipped with Remote Control
Head)
.
3 . Check ground 6200 by operating the Cigar
Lighter
.
4 . Check that the Antenna connector and coax-
ial cable are properly connected
.
5 . Adjusting the Radio controls will change the
operation of the sound system
. Consult the
Delco Sound Service Guide for information
regarding the operating of these controls
.
6 . Before troubleshooting a suspect Speaker,
cheek
all connections to that Speaker .
7 . For proper noise diagnosis. take the car out-
side where
signals are strong . Close the
hood. and keep away from metal buildings or
sources of radio interference
.
8 . Ignition noise on FM may indicate a defec-
tive Ignition System
.
9 . Coasted screws or bolts can cause a poor
ground condition
. Scrape ground screw
clean of any paint or varnish
.
Go to System Check for a guide to normal
operation
.
r Go to System Diagnosis for diagnostic tests .
SYSTEM CHECK
* Use the System Check Table as a guide to
normal operation
.
Refer to the diagnosis given if other results
occur
.
COMPONENT LOCATION 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
.......... Subwoofer Amplifier Assembly ..... Behind IIP. to right of center air vent
201-13-B
. C210 (11 cavities) ................ Behind IIP. on RH lower side of steering column 201- 9-A
C211(2 cavities) ................. Behind center of IIP
........................ C212 (12 cavities) ................ Behind center of IIP 201-13-B
C217 ........................... Behind center of IIP
........................ C218 ........................... Behind center of IIP 201-12-A
C219 (6 cavities)
................. Behind RH side of IIP. near Subwoofer Amplifier 201-13-B
............ 6200 .......................... Behind IIP. left of steering column 201-10-A
......... $203 ........................... IIP harness. behind instrument cluster 201-10-A
......... $205 ........................... IIP harness. behind instrument cluster 201-10-A
................ $207 ........................... I/P harness. at head of console 201-10-A
......... S225 ........................... IIP harness. behind instrument cluster 201-10-A
............ $239 ........................... Radio harness. behind center of IIP 201-13-B
............ S250 ........................... Radio harness. behind center of I/P 201-12-A
............ $251 ........................... Radio harness. behind center of IIP 201-12-A
............ S252 ........................... Radio harness. behind center of IIP 201-12-A
............ S253 ........................... Radio harness. behind center of l[/P 201-12-8
............ $254 ........................... Radio harness. behind center of IIP 201-12-A
............ S255 ........................... Radio harness. behind center of I/P 201-12-A
............ ,9256 ........................... Radio harness. behind center of IIP 201-12-A
............ S257 ........................... Radio harness. behind center of IIP 201-12-A
............ S258 ........................... Radio harness. behind center of IIP 201-12-A
$260 ........................... IIP harness. at head of console ................ 201-10-A
................ S274 ........................... IIP harness. at head of console 201-12-C
$315 ........................... Speaker harness. behind RH side of rear seat .... 201- 9-B
.... $346 ........................... Speaker harness. behind RH side of rear seat 201- 9-B
Tests follow in System Diagnosis .

RADIO
SYSTEM CHECK TABLE
ACTION NORMAL RESULT FOR DlAGNOSlS OF OTHER RESULTS
Turn Ignition Switch to RUN or ACCU Time display appears Do
Test L, or if equipped with Remote Control do
Test A
Turn Radio on and tune
in a local station Power Antenna extends See
Power Antenna (Section 8A-151)
Center Balance and Fade Controls Program
is heard from all speakers without noise If
no sound comes from any Speaker, do Test G
or engine whine
If one or more Speakers do not operate, do Test D
on suspect
Speaker(s)
If excesssive noise is present, do Test H
Turn on Headlights or Park Lights and set
Radio digital display dims Do
test
N, or if equipped with Remote Control
Instrument Panel Lights to maximum
bright- Radio Panel Lamp khts Head, do test B
Lamps light (if equipped) Head,
do Test C
If all results are normal, the system is OK.

SYSTEM DIAGNOSIS
Do the tests below when directed by the Sys-
tem Check.
A: RADIO POWER INPUT TEST FOR
REMOTE CONTROL HEAD (TABLE
1 )
Measure: VOLTAGE
At: RADIO RECEIVER CONNECTOR
C1
(Disconnected)
Measure
Between
1 ~~~~~~ I For Diagnosis I
10 (ORNI
BLK) &
Ground
(Without
Subwoofer Battery I See 1 Amplifier)
Ground (With
Subwoofer Amplifier)
If the voltage is correct, go to Table
2.
1. Check ORNIBLK (340) or ORN 1340)wire
for an open.
A: RADlO POWER INPUT TEST FOR
REMOTE CONTROL HEAD (TABLE
2)
At: RADlO RECEIVER CONNECTORS 61 i%
C3 (Disconnected)
(Continued in next column) Continued from previous
column)
C119 (YEL) &
C311 (BLKILT Battery See 2
BLU)
ell9 (YEL) &
Cl/5 (BLKILT
BLU)
(Without
Subwoofer Amplifier) Battery See
2
el19 (YEL) &
C115 (BLK)
(With
Subwoofer Amplifier)
If all voltages are correct, send Radio to
an authorized
AC-Delco repair station.
1. Check YEL (43) wire.
2. Check BLKILT BLU (151) or BLK (150)
wire for
an open to ground (see sche-
matic).
B: DISPLAY DIMMING TEST FOR
REMOTE CONTROL HEAD
At: RADIO RECElVER CONNECTOR C1
(Disconnected)
C: PANEL LAMPS TEST FOR REMOTE
CONTROL HEAD
(Disconnected)
D: SPEAKER TEST
1. Disconnect suspect speaker connector and
connect
a known good 1.5 volt battery
across speaker t
Caution: Do not leave 1.5 volt battery con-
nected for more than one second. Pro-
longed connection could damage
speaker.
If speaker pops, go to Speaker Test Table.
If speaker does not pop, replace defective
speaker.

D: SPEAKER TEST (Continued from previous column)
At: RADIO OUTPUT FOR SUSPECT SPEAKER
Ignition Switch: RUN
o an authorized AC-Delco
E: REMOTE CONTROL SYSTEM TEST
(TABLE
1)
Measure: VOLTAGE
At: CONNECTOR C210 (Connected)
Conditions: Ignition Switch: RUN
. Headlights: ON
I r Instrument Panel at maximum I brightness
I Measure I I For Diagnosis ( Between
I & I Battery I See 1 1 Ground I I I I
(Continued in next column)
D (YEL) & B
(BLKILT Battery See 2
BLU)
(GRY) & Battery
Ground See 3
If all voltages correct, go to Table
2.
1. Check YEL (43) wire.
2. Check BLKILT BLU (151) wire for an
open to ground (see schematic).
3. Check GRY
(8) wire.
E: REMOTE CONTROL SYSTEM TEST
(TABLE 2)
At: CONNECTOR 6210 (Connected)
Condition:
Measure
Between
I tz I For Diagnosis
1 I - I
A (ORN) & Between 4.5
Ground and 5.5 volts See 1
Press
the Preset, Mute, and RCL buttons
on the Remote Control
Head simul-
taneously
r Turn the steering wheel slowly while mea-
Between 2.0
at
all positions
If
all voltages are correct, check ORN
(917) wire to the Radio. Send Radio to an
authorized AC-Delco repair station if wir-
ing and connections are OK. Refer to Sec-
tion
9A for removal and replacement
~rocedures. ---- - -
(Continued in next column) (Continued from
previous
column)
Refer to Section 3B5 for replacement pro-
cedures.
2. DoTest F.
F: OPTlCAL SLlPRlNG TEST (TABLE 1 )
e Remove the Remote Control Head. Refer to
Section 3B5 for removal procedures.
r Install tool 5-353630 between the Control
Head and connector
C1 (see section 3B5).
Make the following measurements.
At: TOOL 5-35630 (Connected)
Engine running
0 Light Switch: MEAD or PARK
0 lnstrument Panel Lights at maximum
@ If all voltages are correct, go to Table 2.
(Continued on next page)

RADIO
(Continued from previous page)
1. Remove the Cancel Cam. Inspect the Slip
Rings on the Cancel Cam and the spring
loaded contacts on the Turn Signal
Switch. Replace as necessary. Incorrect
or missinglubricant on the Cam can cause
premature failure. Take care to keep lubri-
cant or any foreign material away from
the
LED'S and receptors as it will hinder
or prevent proper operation. The correct
lubricant is part no.
26002312.
F: OPTICAL SLlPRlNG TEST (TABLE 2)
Measure: VOLTAGE
At: TOOL J-35630 (Connected)
Conditions:
@ Engine running
0 Press the Preset, Mute and RCL buttons
or the Seek, Scan, and
AMIFM buttons
on the Remote Control Head
sirnultaneoulsy
0 Turn the steering wheel slowly while
measuring
Measure
Correct I For Diagnosis I
I I Between 3.0 1 I Terminal C & and 4.5 volts
1 Ground 1 at all wheel
I 1 positions I I
I . If the voltage is correct, go to Table 3. (
1. Replace the Remote Control Head. Refer
to Section
3B5 for replacement pro-
cedures.
F: OPTICAL SLlPRllUG TEST (TABLE 3) H: NOlSE DIAGNOSIS
Remove the Cancel Cam. Refer to Section Unplug
the Antenna at the back of the Radio.
3B5 for removal procedures.
If noise disappears, it was being picked up
0 Make the following measurements.
by the Antenna. Consult the Delco Sound
Service Guide for Antenna noise diagnosis.
If the noise persists, it is coming in the Radio
wiring. Refer to the following chart for a
possible cause and corrective action.
At: CONNECTOR 6210 (Connected)
@ Ignition Switch: RUN
Shield the Turn Signal Switch Light
Receptors from outside light with a dark
1. Replace the Turn Signal Switch. Refer to
6: ANTENNA TEST
Check connectors Radio and Antenna ends of
Antenna Coaxial Cable. Connect a known good
test Antenna to the Radio. The test Antenna
must be designed for use
with ARC Radios, as
ARC Radios use a different size Antenna con-
nector than conventional Radios.
@ If Radio plays, replace the Antenna.
If Radio still does not operate, send Radio to
an authorized AC-Delco repair station.
Refer to section 9A for removal and replace-
ment procedures.

NOlSE DlAGNOSlS TEST
SYMPTOM I POSSIBLE CAUSE - - - - - - - - - - - -
Harsh popping noise that changes with engine Ignition
noise
rPm-
Nigh whine (like a siren) that changes with engine Generator
noise
rpm.
REPAIR ACTION
Perform the steps found on the following page
under Ignition Noise.
Add filter package 1224205 to power
and/or
memory lead to the Radio see Fig. 2 on the follow-
ing page.
By-pass the generator output with 250
MFD
1OOv capacitor. See Fig. 3.
Install a braided ground strap on the Radio. See
Fig.
1 on the following page.
I Run a direct wire from battery (+) to generator. I
Exchange the defective Radio with a good Radio.
If noise disappears, send the defective Radio for
repair.
Replace generator.
Noise occurs only when
an accessory is on. Condition in that accessory Install
filter package 1224205 in the power lead(s)
to that accessory. See Fig. 2 on the following
page-
Install a .5MFD by-pass capacitor at the power
lead to that accessory.
(Continued on next page)

RADIO I
(Continued from previous page) from back of Radio
If noise persists with replacement antenna, the
problem must be repaired at the source of noise
(generator, ignition system, accessory, etc.). See
Delco Manual for noise "Sniffing" procedures.
Ignition Noise
Trv the following. fixes in the piven order: 8. Install a braided ground strap on the hood. Replace
defective antenna with a good antenna.
If noise disappears repair or replace the defective
antenna. Check antenna ground, Coaxial Cable
Braid, and ground at connectors.
unplugged
- -
1. Check
for loose or defective spark plug wire.
2. Check for defective spark plug.
3. Move all wiring away from Ignition System
and spark plug wires. Antenna
noise
4. Reroute spark plug wires laying against
anything that could possibly transmit noise
to the Radio (car
g or sensor leads that
travel into the passenger compartment).
5. Inspect Ignition system for the following
and replace if necessary:
r Distributor cap carbon ball eroded away,
cracked or loose cap.
A rotor with burned black spot on wiper or
pits in wiper surface.
r A defective coil.
r An oily film on some of the lead terminals or
inside the cap.
Defective
WE1 module; can cause ignition
noise on
FM only.
6. Replace distributor cap and rotor.
9. Check Heater Core ground; clean or install a
braided ground strap if necessary.
10. Check air conditioner accumulator ground;
clean or install a braided ground strap if
necessarv.
TO STEERING
BRAIDED
GROUN GO LUMN
Figure 1 - Gut the BLACK (ground) wire from
the black plug
at the back of the Radio and run
7. Check the ground from engine to firewall, a braided ground strap from the ease of the
install a braided ground strap if necessary. Radio to good, unpainted body ground.
(TRY GROUNDED AND UNGROUNDED)
POWER LlNE TO RADIO
(IGNITION OR MEMORY)
Figure 2 - install a 1224205 filter package.

Figure 3. Install a 250 MFD, 100V capacitor on
the alternator output lead to ground.
I: SUBWOOFER AMPLIFIER TEST
(TABLE 19
2. Checklrepair BLK (150) wire for an open.
3. Checklrepair WRT (944) wire for an open.
If OK, go to Test J Subwoofer Switch
Test.
I: SUBWOOFER AMPLlFlER TEST
(TABLE
2)
Measure: VOLTAGE
At:
SUBWOOFER AMPLIFIER CONNECTOR
(Connected)
Conditions: Ignition
Svvitch: RUN
. Radio: ON
@ Subwoofer Switch: ON
Measure Correct
I Vdtaae I For Diagnosis
Between
Approx-
Grbund
Ground I See2 I -- -
Gain Switch at Mid Scale
0 Gain Switch at Maximum I Approx- (PPL' ' imately 8
Ground
volts
0 If all voltages are correct, go to Test K
Subwoofer Speaker Test.
1. Replace Subwoofer hplifier Assembly.
2. ChecMrepair PPL (1001) wire for an open.
If OK, go to Test
J: Subwoofer Switch
Test.