Pontiac Fiero 1988 Service Manual page 1158

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m
30
O
D: SPEAKER TEST (TABLE 2)
Measure:
AC VOLTAGE
At: RADIO OUTPUT FOR SUSPECT SPEAKER
Conditions:
• Ignition Switch: R U N
• Radio: ON (High Volume)
Action
Correct
Voltage
For Diagnosis
Connect
voltmeter
across
outputs for
suspect
Speaker with
Radio tuned
to a strong
signal
Varying
around 1 volt
AC
Seel
• If voltage is correct, repair wires between
Radio and suspect Speaker.
1. Remove Radio for service.
E: SUBWOOFER AMPLIFIER TEST
(TABLE 1)
Measure: VOLTAGE
At: SUBWOOFER AMPLIFIER CONNECTOR
(Connected)
Conditions:
• Ignition Switch: RUN
• Radio: ON
Measure
Between
Correct
Voltage
For Diagnosis
3 (PNK) &
Ground
Battery
See 1
13 (PNK) &
Ground
Battery
Seel
13 (PNK) & 14
(BLK)
Battery
See 2
o If voltages are correct, go to Table 2.
1. Check/repair PNK (143) wires (see sche-
matic). If PNK (143) wires are good remove
Radio for service.
2. Check/repair BLK (150) wire (see sche-
matic).
E: SUBWOOFER AMPLIFIER TEST
(TABLE 2)
Measure: AC VOLTAGE
At: SUBWOOFER AMPLIFIER CONNECTOR
(Connected)
Conditions:
• Ignition Switch: RUN
• Radio: ON (High Volume)
Measure
Between
Correct
Voltage
For Diagnosis
7 (DK BLU) &
8 (LT BLU)
Varying
Around 1 Volt
AC
See 1
10 (BRN) & 11
(YEL/BLK)
Varying
Around 1 Volt
AC
See 1
1 (LT GRN) &
2 (DK GRN)
Varying
Around 1 Volt
AC
See 1
4 (TAN) & 5
(GRY/BLK)
Varying
Around 1 Volt
AC
See 1
• If voltages are correct, go to Table 3.
1. Check/repair wires between connector
C247 and Subwoofer Amplifier.
(Continued on next page)

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