2003 FORD MUSTANG Workshop Manual

transmission fluid drain bolt wheel bolt torque automatic transmission fluid oil level service indicator

Page 3393 of 4378

FORD MUSTANG 2003 Workshop Manual Pinpoint Tests speakers
�zSubwoofer
amplifier.
�z Circuitry. E .
�z Poor quality sound from one or
more speakers (not all
speakers) �z
Speaker(s).
�z Circuitry.
�z Audio unit.
�z Subwoofe

Pinpoint Tests speakers
zSubwoofer
amplifier.
z Circuitry. E .
z Poor quality sound from one or
more speakers (not all
speakers) z
Speaker(s).
z Circuitry.
z Audio unit.
z Subwoofer
amplifier. z
Go To Pinpoint Test F .
z Poor quality sound from all
speakers z
Audio unit.
z Speaker(s).
z Circuitry. z
Go To Pinpoint Test G .
z The subwoofer is inoperative zSubwoofer.
z Subwoofer
amplifier.
z Circuitry. z
Go To Pinpoint Test H .
z Loud popping when cycling the
ignition switch z
Audio unit.
z Circuitry. z
Go To Pinpoint Test I .
z One or more audio control
buttons (such as volume, seek,
tune and scan) are not
functional in either radio, tape,
or CD mode or all modes z
Audio unit. zREMOVE the audio
unit and SEND it to
an authorized Ford
audio system repair
facility. TEST the
system for normal
operation.
z When the headlamp switch is in
park or headlamp position and
the ignition switch is in the RUN
or ACC position, the audio unit
back lighting is inoperative — all
other I/P lighting functions are
normal z
Circuitry.
z Audio unit. z
REFER to Section 413 - 00 .
z The audio unit has two items
that can be dimmed— the audio
unit display and the control
buttons; one dims and the other
does not z
Audio unit. zREMOVE the audio
unit and SEND it to
an authorized Ford
audio system repair
facility. TEST the
system for normal
operation.
z Irregular operation of display
and indicator LEDs z
Audio unit. zREMOVE the audio
unit and SEND it to
an authorized Ford
audio system repair
facility. TEST the
system for normal
operation.
z Response time between
pressing any of the audio
control buttons and system
response is more than two
seconds z
Audio unit. zREMOVE the audio
unit and SEND it to
an authorized Ford
audio system repair
facility. TEST the
system for normal
operation. Klj . 3 ba
242003 Mustang Workshop Manual
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Page 3394 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST A: THE AUDIO UNIT IS INOPERATIVE/DOES NOT
OPERATE CORRECTLY
Test Step Result / Action to
Take A1 CHECK OPERATION OF THE AUDIO UNIT
�z
Key in ON position.
�z Turn on the audio unit

Page 3395 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST B: POOR RECEPTION �z
Are the resistances less than 5 ohms? system for normal
operation.
No
REPAIR the circuit
(s) in question. TEST
the system for
normal operation.
Test Step Re

Page 3396 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is the noise eliminated? B4 CHECK GENERATOR
�z
Key in OFF position.
�z Check the generator by disconnecting
the wiring from the voltage regulator.
�z Key in START position.
�z Turn on the aud

z
Is the noise eliminated? B4 CHECK GENERATOR
z
Key in OFF position.
z Check the generator by disconnecting
the wiring from the voltage regulator.
z Key in START position.
z Turn on the audio unit and check the
radio reception.
z Is the noise eliminated? Yes
INSTALL a new generator. REFER to
Section 414 - 02 . TEST the system for normal operation.
No
GO to B5 .
B5 CHECK IGNITION CIRCUITS
z
Key in OFF position.
z Check the ignition circuits for correct
routing, grounding, and integrity of
connections.
z Are the ignition components OK? Yes
GO to
B6 .
No
REPAIR the ignition system as necessary. TEST
the system for normal operation. B6 SUBSTITUTE ANTENNA
z
Substitute a known good antenna.
Ground the antenna base to an
unpainted metal surface on the vehicle.
z Key in START position.
z Verify the operation of the audio unit.
z Is the noise eliminated? Yes
INSTALL a new antenna. TEST the system for
normal operation.
No
GO to
B7 .
B7 SUBSTITUTE ANTENNA CABLE
z
Key in OFF position.
z Substitute a known good antenna
cable.
z Key in START position.
z Verify the operation of the audio unit.
z Is the noise eliminated? Yes
INSTALL a new antenna cable. TEST the system
for normal operation.
No
GO to
B8 .
B8 SUBSTITUTE AUDIO UNIT
z
Key in OFF position.
z Substitute a known good audio unit.
z Key in START position.
z Verify the operation of the audio unit.
z Is the noise eliminated? 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 .
B9 SUBSTITUTE SUBWOOFER
AMPLIFIER z
Key in OFF position.
z Substitute a known good subwoofer
amplifier.
z Key in START position.
z Verify the operation of the audio unit.
z Is the noise eliminated? 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 .
B10 REPOSITION COMPONENTS
z
Key in OFF position.
z 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.
z Key in START position.
z Verify the operation of the audio unit. 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 Klj . 6 ba
242003 Mustang Workshop Manual
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Page 3397 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST C: CONTINUOUS SEEK/SCAN IN AM/FM
PINPOINT TEST D: NO SOUND FROM ONE OR MORE OF THE
SPEAKERS —
NOT ALL SPEAKERS �z
Is the noise eliminated? jumper cable. When noise is eliminated,
P

Page 3398 of 4378

FORD MUSTANG 2003 Workshop Manual For Mach 1000
subwoofer
speakers,GO to
D8
.
D2 CHECK CIRCUITS BETWEEN THE AFFECTED SPEAKER(S) AND
SUBWOOFER AMPLIFIERS �z
Disconnect: Subwoofer Amplifier C4108a.
�z Disconnect: Subwoofer Ampli

For Mach 1000
subwoofer
speakers,GO to
D8
.
D2 CHECK CIRCUITS BETWEEN THE AFFECTED SPEAKER(S) AND
SUBWOOFER AMPLIFIERS z
Disconnect: Subwoofer Amplifier C4108a.
z Disconnect: Subwoofer Amplifier C4109b.
z Disconnect: Affected Speaker(s).
z Measure the resistance between the subwoofer amplifier and the
affected speaker(s) and between the subwoofer amplifier and ground
as follows:
z 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? Speaker Circuits Affected Speaker Pin Subwoofer Amplifier Pin Circuit
RF 1 (convertible only) LH 7 822 (BK/LG)
RF 2 (convertible only) LH 8 287 (BK/WH)
LF 1 (convertible only) LH 7 822 (BK/LG)
LF 2 (convertible only) LH 8 287 (BK/WH)
RR 1 RH 7 822 (BK/LG)
RR 2 RH 8 287 (BK/WH)
LR 1 RH 7 822 (BK/LG)
LR 2 RH 8 287 (BK/WH) Yes
GO to
D3 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation. D3 CHECK CIRCUITS BETWEEN THE AUDIO UNIT AND THE
SUBWOOFER AMPLIFIERS z
Disconnect: Audio Unit C290b.
z Disconnect: Subwoofer Amplifier C4108a.
z Disconnect: Subwoofer Amplifier C4109b.
z Measure the resistance between the subwoofer amplifier and the
audio unit C290b and between the subwoofer amplifier and ground
as follows:
z 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? Speaker Circuits Audio Unit C290b Pin Subwoofer Amplifier Pin Circuit
2 LH 5 167 (BN/OG)
6 RH 5 169 (LG/BK)
1 LH 6 168 (RD/BK)
5 RH 6 172 (LB/RD) Yes
GO to
D6 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation. D4 CHECK CIRCUITS BETWEEN THE AFFECTED SPEAKER(S) AND
SUBWOOFER AMPLIFIER z
Disconnect: Subwoofer Amplifier C4109b.
z Disconnect: Affected Speaker(s).
z Measure the resistance between the subwoofer amplifier and the Yes
GO to
D5 . Klj . 8 ba
242003 Mustang Workshop Manual
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Page 3399 of 4378

FORD MUSTANG 2003 Workshop Manual affected speaker(s) and between the subwoofer amplifier and ground
as follows:
�z Are the resistances less than 5 ohms between the subwoofer
amplifier and affected speaker(s) and greater than 10,00

affected speaker(s) and between the subwoofer amplifier and ground
as follows:
z Are the resistances less than 5 ohms between the subwoofer
amplifier and affected speaker(s) and greater than 10,000 ohms
between the subwoofer amplifier and ground? Speaker Circuits Affected Speaker Pin Subwoofer Amplifier Pin Circuit
RR 1 7 822 (BK/LG)
RR 2 8 287 (BK/WH)
LR 1 7 822 (BK/LG)
LR 2 8 287 (BK/WH) No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation.
D5 CHECK CIRCUITS BETWEEN THE AUDIO UNIT AND THE
SUBWOOFER AMPLIFIER z
Disconnect: Audio Unit C290b.
z Disconnect: Subwoofer Amplifier C4109b.
z 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.
z 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? Yes
GO to
D6 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation. D6 CHECK SPEAKER(S)
z
Key in OFF position.
z Substitute the affected speaker with a known good component.
z Key in ON position.
z Turn on the audio unit.
z Is the affected speaker(s) operational? Yes
INSTALL a new
speaker. TEST the
system for normal
operation.
No
GO to
D7 .
D7 CHECK THE AUDIO UNIT
z
Key in OFF position.
z Substitute the affected audio unit with a known good component.
z Key in ON position.
z Turn on the audio unit.
z Is the affected speaker(s) operational? Yes
SEND the audio
unit to an
authorized Ford
audio system
repair facility.
TEST the system
for normal
operation.
No
REMOVE the
subwoofer
amplifier and
SEND it to an
authorized Ford
audio system
repair facility.
TEST the system Klj . 9 ba
242003 Mustang Workshop Manual
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Page 3400 of 4378

FORD MUSTANG 2003 Workshop Manual for normal
operation.
D8 CHECK FOR POWER TO THE AFFECTED SUBWOOFER
AMPLIFIER �z
Key in OFF position.
�z Disconnect: Mach 1000 Affected Subwoofer Amplifier.
�z Measure the voltage between affecte

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