Ford 2003 Mustang Workshop Manual page 3396

Is the noise eliminated?
B4 CHECK GENERATOR
Key in OFF position.
Check the generator by disconnecting
the wiring from the voltage regulator.
Key in START position.
Turn on the audio unit and check the
radio reception.
Is the noise eliminated?
B5 CHECK IGNITION CIRCUITS
Key in OFF position.
Check the ignition circuits for correct
routing, grounding, and integrity of
connections.
Are the ignition components OK?
B6 SUBSTITUTE ANTENNA
Substitute a known good antenna.
Ground the antenna base to an
unpainted metal surface on the vehicle.
Key in START position.
Verify the operation of the audio unit.
Is the noise eliminated?
B7 SUBSTITUTE ANTENNA CABLE
Key in OFF position.
Substitute a known good antenna
cable.
Key in START position.
Verify the operation of the audio unit.
Is the noise eliminated?
B8 SUBSTITUTE AUDIO UNIT
Key in OFF position.
Substitute a known good audio unit.
Key in START position.
Verify the operation of the audio unit.
Is the noise eliminated?
B9 SUBSTITUTE SUBWOOFER
AMPLIFIER
Key in OFF position.
Substitute a known good subwoofer
amplifier.
Key in START position.
Verify the operation of the audio unit.
Is the noise eliminated?
B10 REPOSITION COMPONENTS
Key in OFF position.
Determine if the noise can be
eliminated by repositioning the antenna
cable, speaker circuits, or audio unit
power feed circuits away from other
circuits or brackets.
Key in START position.
Verify the operation of the audio unit.
Yes
INSTALL a new generator. REFER to
414-02 . TEST the system for normal operation.
No
GO to B5 .
Yes
GO to B6 .
No
REPAIR the ignition system as necessary. TEST
the system for normal operation.
Yes
INSTALL a new antenna. TEST the system for
normal operation.
No
GO to B7 .
Yes
INSTALL a new antenna cable. TEST the system
for normal operation.
No
GO to B8 .
Yes
REMOVE the audio unit and SEND it to an
authorized Ford audio system repair facility.
TEST the system for normal operation.
No
GO to B9 .
Yes
REMOVE the subwoofer amplifier and SEND it to
an authorized Ford audio system repair facility.
TEST the system for normal operation.
No
GO to B10 .
Yes
Permanently REPOSITION the components as
needed. TEST the system for normal operation.
No
GROUND various parts (for example, engine,
fenders, quarter panels, stone deflectors, body
sheet metal) of the vehicle to the frame using a
Section