Ford 2003 Mustang Workshop Manual page 3398

D2 CHECK CIRCUITS BETWEEN THE AFFECTED SPEAKER(S) AND
SUBWOOFER AMPLIFIERS
Disconnect: Subwoofer Amplifier C4108a.
Disconnect: Subwoofer Amplifier C4109b.
Disconnect: Affected Speaker(s).
Measure the resistance between the subwoofer amplifier and the
affected speaker(s) and between the subwoofer amplifier and ground
as follows:
Speaker Circuits
Affected Speaker Pin Subwoofer Amplifier Pin
RF 1 (convertible only)
RF 2 (convertible only)
LF 1 (convertible only)
LF 2 (convertible only)
RR 1
RR 2
LR 1
LR 2
Are the resistances less than 5 ohms between the subwoofer
amplifier and the affected speaker(s) and greater than 10,000
ohms between the subwoofer amplifier and ground?
D3 CHECK CIRCUITS BETWEEN THE AUDIO UNIT AND THE
SUBWOOFER AMPLIFIERS
Disconnect: Audio Unit C290b.
Disconnect: Subwoofer Amplifier C4108a.
Disconnect: Subwoofer Amplifier C4109b.
Measure the resistance between the subwoofer amplifier and the
audio unit C290b and between the subwoofer amplifier and ground
as follows:
Speaker Circuits
Audio Unit C290b Pin Subwoofer Amplifier Pin
2
6
1
5
Are the resistances less than 5 ohms between the subwoofer
amplifier and the audio unit and greater than 10,000 ohms
between the subwoofer amplifier and ground?
D4 CHECK CIRCUITS BETWEEN THE AFFECTED SPEAKER(S) AND
SUBWOOFER AMPLIFIER
Disconnect: Subwoofer Amplifier C4109b.
Disconnect: Affected Speaker(s).
Measure the resistance between the subwoofer amplifier and the
Circuit
LH 7 822 (BK/LG)
LH 8 287 (BK/WH)
LH 7 822 (BK/LG)
LH 8 287 (BK/WH)
RH 7 822 (BK/LG)
RH 8 287 (BK/WH)
RH 7 822 (BK/LG)
RH 8 287 (BK/WH)
Circuit
LH 5 167 (BN/OG)
RH 5 169 (LG/BK)
LH 6 168 (RD/BK)
RH 6 172 (LB/RD)
For Mach 1000
subwoofer
speakers,GO to
D8 .
Yes
GO to D3 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation.
Yes
GO to D6 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation.
Yes
GO to D5 .