Pontiac Fiero 1988 Service Manual page 1157

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[Electronically
Tuned Radio (ETR)]
No sound or
distorted sound
comes from speaker
D: Speaker Test
(Delco B o s e ® Music
System) No sound or
distorted sound
comes from the
Subwoofer Speaker
E: Subwoofer
Amplifier Test
Excessive noise
comes from all
speakers
H Noise Diagnosis
Test
A: RADIO POWER INPUT TEST
{TABLE 1)
Measure: VOLTAGE
At: RADIO CONNECTOR (Disconnected)
Condition:
® ignition Switch: RUN
Measure
Between
Correct
Voltage
For Diagnosis
F (YEL) &
Ground
Battery Seel
F (YEL) & G
(BLK)
Battery See
2
• If voltages are correct, go to Table 2.
1. Check YEL (43) wire for an open (see sche-
matic).
2. Check BLK (150) wire for an open to
ground (see schematic).
A: RADIO POWER IISirUT TEST
(TABLE 2)
C: DISPLAY DIMMING TEST
Measure: VOLTAGE
At: RADIO CONNECTOR C208
(Disconnected)
Measure
Between
Correct
Voltage
For Diagnosis
A (ORN) &
Ground
Battery Seel
© If voltage is correct, remove Radio for
service.
1. Check ORN (40) wire for an open (see sche-
matic).
B: PANEL LIGHT TEST
Measure: VOLTAGE
At: RADIO CONNECTOR (Disconnected)
Conditions:
• Light Switch: PARK
• Dimming Switch: BRIGHT
Measure
Between
Correct
Voltage
For Diagnosis
M (GRY) &
Ground
Battery Seel
® If voltage is correct, remove Radio for
service.
1. Check GRY (8) wire for an open (see sche-
matic).
Measure: VOLTAGE
At: RADIO CONNECTOR C208
(Disconnected)
Condition:
• Light Switch:
HEAD or PARK
Measure
Between
B (BRN) &
Ground
Correct
Voltage
Battery
For Diagnosis
Seel
° If voltage is correct, remove Radio for
service.
1. Check BRN (9) wire for an open (see sche-
matic).
D: SPEAKER TEST (TABLE 1)
Connect: ANALOG OHMMETER
At: SUSPECT SPEAKER
Conditions:
• Ohmmeter set on RX1 scale
• Speaker Wires: DISCONNECTED
Action
Correct Result For Diagnosis
Connect
ohmmeter
across speaker
terminals
Speaker
pops
Seel
• If the result is correct, go to Table 2.
1. Replace the problem speaker with a new
one.