2003 FORD MUSTANG pinpoint

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.
z Is the audio unit display illuminated? Yes
GO to
A2 .
No
GO to A4 .
A2 CHECK FOR SOUND COMING FROM THE SPEAKERS
z
Verify that sound is coming from all the speakers.
z Is there sound coming from all the speakers? Yes
GO to
A3 .
No
GO to Pinpoint Test C .
A3 CHECK THE AUDIO UNIT CONTROLS AND FEATURES
z
Refer to the owner literature for audio system controls.
z Verify that the controls and features operate correctly.
z Do the controls and features operate correctly? Yes
System operation is
normal at this time.
No
REMOVE the audio
unit and SEND it to
an authorized Ford
audio system facility.
TEST the system for
normal operation.
A4 CHECK VOLTAGE AT THE AUDIO UNIT
z
Key in OFF position.
z Disconnect: Audio Unit C290b.
z Key in ON position.
z Measure the voltage between the audio unit C290b pin 10, circuit
1002 (BK/PK), harness side and ground, and between the audio
unit C290b pin 9, circuit 828 (VT/LB), harness side and ground.
z Are the voltages greater than 10 volts? Yes
GO to
A5 .
No
REPAIR the circuit
(s) in question. TEST
the system for
normal operation. A5 CHECK THE GROUND CIRCUITS TO THE AUDIO UNIT
z
Key in OFF position.
z Measure the resistance between the audio unit C290b pin 2, circuit
1205 (BK), harness side and ground; and between the audio unit
C290b pin 11, circuit 694 (BK/LG), harness side and ground; and
between the audio unit C290b pin 16, circuit 694 (BK/LG), harness
side and ground Yes
REMOVE the audio
unit and SEND it to
an authorized Ford
audio system repair
facility. TEST the Klj . 4 ba
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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 Result / Action to Take
B1 CHECK ANTENNA CABLE
CONNECTIONS z
Key in OFF position.
z Check the antenna connections
including the extension cable.
z Check to make sure the antenna is
securely mounted to the vehicle body
at ground points.
z Are the connections clean, secure,
and in metal- to-metal contact? Yes
GO to
B2 .
No
CLEAN and SECURE the antenna connections
as necessary. TEST the system for normal
operation. B2 CHECK SUPPRESSION
EQUIPMENT/MOUNTING AND
CONNECTING CIRCUITS z
Check all necessary suppression
equipment and the radio frequency
interference suppression bond. Refer
to Section 415 - 01 .
z Check the radio receiver hood bonding
strap and the body- to-chassis straps
for integrity, cleanliness, and metal- to-
metal contact.
z NOTE: The capacitor mounting points
are used to complete the electrical
circuit and must be mounted securely
to clean surfaces.
z Check the mounting and connecting
circuits of the radio ignition interference
capacitor for integrity, cleanliness, and
metal- to-metal contact.
z Are the connections clean, secure,
and in metal- to-metal contact? Yes
GO to
B3 .
No
CLEAN, SECURE, or INSTALL new suppression
equipment as necessary. TEST the system for
normal operation. B3 CHECK RADIO IGNITION
INTERFERENCE CAPACITOR z
Check the operation of the radio
ignition interference capacitor by
substituting it with a known good
component.
z Key in START position.
z Turn the audio unit on and check the
radio reception. Yes
INSTALL a new radio ignition interference
capacitor. TEST the system for normal operation.
No
GO to
B4 . Klj . 5 ba
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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,
PROVIDE a permanent ground where
necessary. TEST the system for normal
operation.
Test Step Result / Action to Take
C1 CHECK OPERATION OF THE
SEEK/SCAN FUNCTIONS z
Key in ON position.
z Operate the SEEK/SCAN functions
with the audio unit in both AM and FM
tuner modes.
z Do the SEEK/SCAN functions
search continuously? Yes
GO to
C2 .
No
The system is OK. C2 CHECK ANTENNA FOR DAMAGE
z
Key in OFF position.
z Disconnect: Antenna Lead Terminal.
z Measure the resistance between the
antenna cable lead terminal and the
end of the antenna grid wire.
z Is the resistance less than 8 ohms? Yes
GO to
C3 .
No
REPAIR the antenna. REFER to Section 415 - 02
C3 SUBSTITUTE ANTENNA EXTENSION
CABLE z
Substitute a known good antenna
cable between the audio unit and the
antenna.
z Key in START position.
z Check the operation of the audio unit.
z Is the noise eliminated? Yes
INSTALL a new antenna extension cable. REFER
to
Section 415 - 02 . TEST the system for normal
operation.
No
REINSTALL the original cable. REMOVE the
audio unit and SEND it to an authorized Ford
audio system repair facility. TEST the system for
normal operation. Test Step Result / Action to
Take D1 CHECK FOR SOUND
z
Key in ON position.
z Turn on the audio unit.
z Are all speakers without sound? Yes
GO to
Pinpoint Test E .
No
For convertible,
GO to D2 .
For coupe, GO to
D4 . Klj . 7 ba
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PINPOINT TEST E: NO SOUND FROM ALL OF THE SPEAKERS z
Disconnect: Respective Amplifier to Subwoofer Speaker Connector.
z Measure the resistance between the affected subwoofer speaker and
its respective amplifiers, and between the affected subwoofer
speaker and ground as follows:
z Is the resistance less than 5 ohms between the amplifier and
subwoofer speaker and greater that 10,000 ohms between the
subwoofer speaker harness and ground? Speaker Circuits—
Right Side Affected Subwoofer
Speaker Pin Respective Amplifier
Pin Circuit
1 4 176
(PK/LG) 3 3 179
(OR/RD) 2 4 189
(TN/LB) 4 3 187
(DB/OR)
Speaker Circuits— Left Side Affected Subwoofer
Speaker Pin Respective Amplifier
Pin Circuit
1 4 176
(PK/LG) 3 3 179
(OR/RD) 2 4 189
(TN/LB) 4 3 187
(DB/OR) INSTALL a new
subwoofer
amplifier.
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation.
Test Step Result / Action to Take
E1 CHECK FOR AUDIO UNIT
OPERATION z
Key in ON position.
z Turn the audio unit on.
z Does the audio unit
display illuminate? Yes
GO to
E2 .
No
GO to Pinpoint Test A .
E2 CHECK THE SPEAKER
OPERATION z
Check the operation of all
speakers.
z Are all speakers
inoperative? Yes
REMOVE the audio unit and SEND it to an authorized Ford
audio system repair facility. TEST the system for normal
operation. Klj . 12 ba
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PINPOINT TEST F: POOR QUALITY SOUND FROM ONE OR MORE
SPEAKERS (NOT ALL SPEAKERS) No
GO to
Pinpoint Test D .
Test Step Result / Action to
Take F1 CHECK SOUND QUALITY
z
Key in ON position.
z Turn on the audio unit.
z Carry out the speaker walk- around test by pressing preset buttons 3
and 6 simultaneously.
z Do all speakers have poor sound quality? Yes
REMOVE the
audio unit and
SEND it to an
authorized Ford
audio system
repair facility.
TEST the system
for normal
operation.
No
For convertible,
GO to
F2 .
For coupe, GO to
F4 .
For Mach 1000
subwoofer
speakers,GO to
F6 .
F2 CHECK CIRCUITS BETWEEN 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 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 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
F3 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation. Klj . 13 ba
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PINPOINT TEST G: POOR QUALITY SOUND FROM ALL SPEAKERS
PINPOINT TEST H: THE SUBWOOFER IS INOPERATIVE z
Turn on the audio unit.
z Is the sound quality OK? system for normal
operation.
No
GO to
F7 .
F11 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 sound quality OK? 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
for normal
operation.
Test Step Result / Action to Take
G1 CHECK POOR SOUND QUALITY IN
ALL SPEAKERS z
Key in ON position.
z Turn on the audio unit.
z Carry out the speaker walk- around test
by pressing preset buttons 3 and 6
simultaneously.
z Is there poor quality or distortion in
all speakers? 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
Pinpoint Test F .
Test Step Result / Action to
Take H1 CHECK THE SUBWOOFER OPERATION
z
Key in ON position.
z Turn on the audio unit and listen for correct subwoofer operation.
z Are all subwoofers inoperative? Yes
GO to
H16 .
No
For convertible,
GO to H2 .
For coupe, GO to
H6 . Klj . 17 ba
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PINPOINT TEST I: LOUD POPPING WHEN CYCLING THE IGNITION
SWITCH—
CONVERTIBLE z
Is the resistance less than 5 ohms between the amplifier and
subwoofer speaker and greater that 10,000 ohms between the
subwoofer speaker harness and ground? 4 3 187
(DB/OR)
Speaker Circuits— Left Side Affected Subwoofer
Speaker Pin Respective Amplifier
Pin Circuit
1 4 176
(PK/LG) 3 3 179
(OR/RD) 2 4 189
(TN/LB) 4 3 187
(DB/OR) H16 CHECK THE AUDIO UNIT
z
Substitute a known good audio unit.
z Verify the operation of the audio unit.
z Does the audio unit operate correctly? 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
for normal
operation.
Test Step Result / Action to Take
I1 CHECK SUBWOOFERS FOR LOUD
POPS z
Key in ON position.
z Listen to see whether the loud pops
are from the LH or RH subwoofer
amplifiers for the convertible.
z Are the pops from both subwoofer Yes
REMOVE the audio unit and SEND it to an
authorized Ford audio system repair facility.
TEST the system for normal operation. Klj . 23 ba
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DIAGNOSIS AND TESTING
Headlamps
Refer to Wiring Diagrams Cell
85 , Headlamps for schematic and connector information.
Inspection and Verification 1. Verify the customer concern by operating the headlamps.
2. Visually inspect for the following obvious signs of mechanical and electrical damage.
3. If the concern is not visually evident, determine the symptom and proceed to Symptom Chart.
Symptom Chart SECTION 417-
01: Exterior Lighting 2003 Mustang Workshop Manual Special Tool(s)
73III Automotive Meter or
equivalent
105-
R0057
Visual Inspection Chart Mechanical Electrical
z
Damaged headlamp switch (11654)
z Damaged multifunction switch (13K359) z
Battery junction box (BJB) fuse 2 (30A)
z Central junction box (CJB) fuse(s):
„38 (20A)
„ 4 (7.5A) (RH)
„ 10 (7.5A) (LH)
z Damaged wiring harness
z Loose or corroded connections
z Headlamp bulb
Symptom Chart Condition
Possible Sources Action
z Both
headlamps are
inoperative z
Battery junction
box (BJB) fuse 2
(30A).
z Headlamp
switch.
z Circuitry.
z Multifunction
switch. z
Go To Pinpoint Test A .
z The low beams
are inoperative z
Circuitry.
z Multifunction
switch. z
Go To Pinpoint Test B . Klj . 1 ba
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