Pontiac Fiero 1988 Service Manual page 1160

RADIO fTZir
G: SUBWOOFER SPEAKER TEST
(TABLE 2)
Measure: AC VOLTAGE
At: SUBWOOFER
AMPLIFIER
CONNECTOR
(Connected)
Conditions:
• Speaker Wires: RECONNECTED
• Ignition Switch: RUN
• Radio: ON (High Volume)
• Performance sound control at
Maximum
Measure Correct
For Diagnosis
Between Voltage
For Diagnosis
15 (LT BLU/ Varying
BLK) & 12 around 1 volt Seel
(DK BLU/ AC
WHT)
• If the voltage is correct, check/repair wires
between the Subwoofer Amplifier and the
Subwoofer Speaker.
1. Remove Subwoofer Amplifier for service.
H: NOISE DIAGNOSIS TEST
Unplug Antenna at the back of the Radio.
• If noise disappears, it was being picked up
by the Antenna. Consult the Delco Sound
Service Guide for Antenna noise diagnosis.
• If noise persists, it is coming in from the
Radio wiring. Refer to the following chart for
a possible cause and corrective action.