Ford 2003 Mustang Workshop Manual page 3404

ohms between the subwoofer amplifier and ground?
F3 CHECK CIRCUITS BETWEEN THE AUDIO UNIT AND THE
SUBWOOFER AMPLIFIERS
Disconnect: Audio Unit C290b.
Disconnect: Subwoofer Amplifier C4108b.
Disconnect: Subwoofer Amplifier C4109b.
Measure the resistance between subwoofer amplifier and audio unit
C290a and between subwoofer amplifier and ground as follows:
Speaker Circuits
Audio Unit C290a 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?
F4 CHECK CIRCUITS BETWEEN AFFECTED SPEAKER(S) AND
SUBWOOFER AMPLIFIER
Disconnect: Subwoofer Amplifier C4109b.
Disconnect: Affected Speaker(s).
Measure the resistance between subwoofer amplifier and the
affected speaker(s) and between subwoofer amplifier and ground as
follows:
Speaker Circuits
Affected Speaker Pin Subwoofer Amplifier Pin
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?
F5 CHECK CIRCUITS BETWEEN THE AUDIO UNIT AND THE
SUBWOOFER AMPLIFIER
Disconnect: Audio Unit C290b.
Disconnect: Subwoofer Amplifier C4109b.
Measure the resistance between the subwoofer amplifier C4109b pin
5, circuit 169 (LG/BK), harness side and the audio unit C290a pin 6,
circuit 169 (LG/BK), harness side and between the subwoofer
amplifier C4109b pin 5, circuit 169 (LG/BK), harness side and
ground; and between the subwoofer amplifier C4109b pin 6, circuit
172 (LB/RD), harness side and the audio unit C290a pin 5, circuit
172 (LB/RD), harness side and between the subwoofer amplifier
C4109b pin 6, circuit 172 (LB/RD), harness side and ground.
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?
F6 CHECK FOR AN AUDIO SIGNAL TO THE SUBWOOFER
Circuit
LH 5 167 (BN/OG)
RH 5 169 (LG/BK)
LH 6 168 (RD/BK)
RH 6 172 (LB/RD)
Circuit
7 822 (BK/LG)
8 287 (BK/WH)
7 822 (BK/LG)
8 287 (BK/WH)
Yes
GO to F6 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation.
Yes
GO to F5 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation.
Yes
GO to F10 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation.