pinpoint 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,
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
242003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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
242003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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
242003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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
242003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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
242003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Pinpoint Tests
PINPOINT TEST A: BOTH HEADLAMPS ARE INOPERATIVE z
The high beams
are inoperative z
Central junction
box (CJB) fuse
38 (20A).
z Circuitry.
z Multifunction
switch. z
Go To Pinpoint Test C .
z One low beam
headlamp is
inoperative z
Central junction
box (CJB) fuse
(s):
„10 (7.5A)
(LH).
„ 4 (7.5A)
(RH).
z Headlamp bulb.
z Circuitry. z
Go To Pinpoint Test D .
z One high beam
headlamp is
inoperative z
Headlamp bulb.
z Circuitry. z
Go To Pinpoint Test E .
z The headlamps
are on
continuously z
Headlamp
switch.
z Circuitry.
z Multifunction
switch. z
Go To Pinpoint Test F .
z The flash- to-
pass feature is
inoperative z
Circuitry.
z Multifunction
switch. z
CHECK Circuit 196 (DB/OG) for
an open. REPAIR if necessary. IF
OK, INSTALL a new multifunction
switch; REFER to Section 211 -
05 . TEST the system for normal
operation. Test Step Result / Action to Take
A1 CHECK THE VOLTAGE TO THE HEADLAMP SWITCH
z
Disconnect: Headlamp Switch C205.
z Measure the voltage between headlamp switch C205 Pin
B1, Circuit 196 (DB/OG), harness side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
A2 .
No
REPAIR the circuit. TEST
the system for normal
operation. A2 CHECK CIRCUIT 15 (RD/YE) FOR OPEN
z
Disconnect: Multifunction Switch C202a. Yes Klj . 2 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST B: THE LOW BEAMS ARE INOPERATIVE z
Measure the resistance between headlamp switch C205 Pin
H, Circuit 15 (RD/YE), harness side and multifunction switch
C202a Pin 15, Circuit 15 (RD/YE), harness side.
z Is the resistance less than 5 ohms? RECONNECT headlamp
switch C205. GO to
A3 .
No
REPAIR the circuit. TEST
the system for normal
operation. A3 CHECK THE VOLTAGE TO THE MULTIFUNCTION SWITCH
z
Place the headlamp switch in the ON position.
z Measure the voltage between multifunction switch C202a
Pin 15, Circuit 15 (RD/YE), harness side and ground.
z Is the voltage greater than 10 volts? Yes
INSTALL a new
multifunction switch;
REFER to
Section 211 - 05 .
TEST the system for
normal operation.
No
INSTALL a new headlamp
switch; REFER to Lamp Switch — Headlamp in this
section. TEST the system
for normal operation. Test Step Result / Action to Take
B1 CHECK THE VOLTAGE TO CJB FUSE 4 (7.5A) AND CJB
FUSE 10 (7.5A) z
Key in OFF position.
z Place the multifunction switch in the low beam position.
z Remove Fuse 4 (7.5A) and Fuse 10 (7.5A) from the CJB.
z Place the headlamp switch in the ON position.
z Measure the voltage between the following CJB fuse
terminals and ground:
„Fuse 4 connector.
„ Fuse 10 connector. Yes
Go To Pinpoint Test D
.
No
GO to B2 . Klj . 3 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST C: THE HIGH BEAMS ARE INOPERATIVE z
Are the voltages greater than 10 volts? B2 CHECK CIRCUIT 13 (RD/BK) FOR OPEN
z
Disconnect: Multifunction Switch C202a.
z Measure the resistance between multifunction switch C202a
Pin 13, Circuit 13 (RD/BK), harness side and CJB Fuse 4
and Fuse 10.
z Are the resistances less than 5 ohms? Yes
INSTALL a new
multifunction switch;
REFER to
Section 211 - 05 .
TEST the system for normal
operation.
No
REPAIR the circuit. TEST
the system for normal
operation. Test Step Result / Action to Take
C1 CHECK THE CIRCUIT 12 (LG/BK)
z
Disconnect: LH Headlamp C1021.
z Measure the resistance between LH headlamp C1021 Pin
2, Circuit 12 (LG/BK), harness side and CJB Fuse 38 (20A).
z Is the resistance less than 5 ohms? Yes
RECONNECT the LH
headlamp (13008). GO to
C2
.
No
REPAIR the circuit. TEST
the system for normal
operation. C2 CHECK THE VOLTAGE TO CJB FUSE 38 (20A)
z
Place the headlamp switch in the ON position.
z Place the multifunction switch in the high beam position.
z Measure the voltage between CJB Fuse 38 (20A) and
ground. Yes
Go To Pinpoint Test E
.
No Klj . 4 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST D: ONE LOW BEAM HEADLAMP IS INOPERATIVE z
Is the voltage greater than 10 volts? GO to
C3 .
C3 CHECK CIRCUIT 632 (GY/OG) FOR OPEN
z
Disconnect: Multifunction Switch C202a.
z Measure the resistance between the CJB Fuse 38 (20A),
and multifunction switch C202a Pin 12, Circuit 632
(GY/OG), harness side.
z Is the resistance less than 5 ohms? Yes
INSTALL a new
multifunction switch; REFER
to
Section 211 - 05 . TEST
the system for normal
operation.
No
REPAIR the circuit. TEST
the system for normal
operation. Test Step Result / Action to Take
D1 CHECK THE VOLTAGE TO THE INOPERATIVE HEADLAMP
BULB z
Disconnect: Inoperative Headlamp.
z Place the headlamp switch in the ON position.
z Place the multifunction switch in the low beam position.
z Measure the voltage between RH headlamp C1041 Pin 3,
Circuit 1056 (DB/LG), or LH headlamp C1021 Pin 3, Circuit
1055 (WH/LG), harness side and ground.
z Is the voltage greater than 10 volts? Yes
INSTALL a new
headlamp bulb; REFER
to
Bulb — Headlamp in
this section. TEST the
system for normal
operation.
No
REPAIR the circuit. TEST
the system for normal
operation. Klj . 5 ba
82003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...