Pontiac Fiero 1988 Service Manual page 1159

(Continued from previous page)
E: SUBWOOFER AMPLIFIER TEST
(TABLE 3)
Measure: VOLTAGE
At: SUBWOOFER AMPLIFIER CONNECTOR
(Connected)
Conditions:
• Ignition
Switch:
RUN
• Radio: ON
Measure
Between
Correct
Voltage
For Diagnosis
6 (WHT) &
Ground
Approx. 8
volts
Seel
• Performance sound control at minimum
9 (YEL) &
Ground
3.5 to 4.5 volts See 2
© Performance sound control at maximum
9 (YEL) &
Ground
Approx. 8
volts
See 2
• If all voltages are correct, go to Test G:
Subwoofer Speaker Test.
1. Check WHT (302) wire for a short to
ground, if OK replace Subwoofer Ampli-
fier Assembly.
2. Go to Test F: Performance Sound Control
Test.
F: PERFORMANCE SOUND CONTROL
TEST
Measure: VOLTAGE
At: DOME LIGHTS MODULE CONNECTOR
(Connected)
Conditions:
• Ignition Switch: RUN
° Radio; ON
Measure
Between
Correct
Voltage
For Diagnosis
B (WHT/BLK)
& Ground
Approximately
8 volts
Seel
• Performance sound control at minimum
A (YEL) &
Ground
3.5 to 4.5 volts See 2
• Performance sound control at maximum
A (YEL) &
Ground
Approximately
8 volts
See 2
° If all voltages are correct, check/repair
YEL (303) wire (see schematic).
1. Check/repair WHT/BLK or WHT (302)
wire (see schematic).
2. Check/repair YEL (303) wire for a short to
ground. If OK, replace Performance
Sound Control.
G: SUBWOOFER SPEAKER TEST
(TABLE 1)
Connect:
ANALOG
OHR ,
At: SUSPECT SUBWOOFER SPEAKER(S)
(Disconnected)
Conditions:
• Speaker Wires: DISCONNECTED
• Ohmmeter set on RX1
scale
Action Correct Result For Diagnosis
Connect
Ohmmeter
across
Subwoofer
Speaker
Terminals
Speaker
"pops"
Seel
© If result is correct, go to Table 2.
1. Replace Subwoofer Speaker.
01
0
1
3
m
30
O