FORD MUSTANG 2003 Workshop Manual

z
Is the voltage greater than 10 volts? operation.
H11 CHECK FOR GROUND TO THE SUBWOOFER AMPLIFIER
HARNESS z
NOTE: Ground circuit 694 is located in the same cavity in all four
subwoofer amplifiers.
z Measure the resistance between subwoofer amplifier pins 2, circuit
694 (BK/LG) and ground.
z Is the resistance less than 5 ohms? Yes
GO to
H12 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation. H12 CHECK FOR AN AUDIO SIGNAL TO THE AFFECTED
SUBWOOFER AMPLIFIER z
Key in ON position.
z NOTE: Audio signal circuits 169 and 172 are located in the same
cavity on all four subwoofers.
z Turn on the audio unit and check for a fluctuating AC voltage
between affected subwoofer amplifier pin 8, circuit 172 (LB/RD) and
pin 7, circuit 169 (LG/BK).
z Does the voltage vary as the volume is adjusted? Yes
GO to
H14 .
No
GO to H13 .
H13 CHECK AUDIO SIGNAL CIRCUITS AT THE AFFECTED
SUBWOOFER AMPLIFIER FOR OPEN AND SHORT TO GROUND z
Key in OFF position.
z Disconnect: Audio Unit C290a.
z Measure the resistance between the affected subwoofer amplifier
and the audio unit C290a, and between the affected subwoofer
amplifier and ground as follows: Yes
SEND the audio
unit to an
authorized Ford
audio system Klj . 21 ba
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z
Is the resistance less than 5 ohms between the audio unit and
subwoofer amplifier harness and greater that 10,000 ohms
between the subwoofer amplifier harness and ground? Speaker Circuits Audio Unit C290a
Pin Subwoofer Amplifier Harness
Pin Circuit
2 8 172
(LB/RD) 8 7 169
(LG/BK) repair facility.
TEST the system
for normal
operation.
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation.
H14 CHECK FOR AN AUDIO SIGNAL AT THE AFFECTED
SUBWOOFER z
Key in OFF position.
z Connect: Affected Subwoofer Amplifier.
z Disconnect: Affected Subwoofer Speaker.
z Key in ON position.
z Turn on the audio unit and check for a fluctuating AC voltage
between affected subwoofer as follows: For right subwoofer pin 4,
circuit 187 (DB/OG) and pin 2, circuit 189 (LG/BK) harness side; and
between pin 3, circuit 179 (OR/RD) and pin 1, circuit 176 (PK/LG)
harness side. For left subwoofer pin 1, circuit 187 (DB/OR) and pin 3,
circuit 189 (LG/BK) harness side; and between pin 2, circuit 179
(OR/RD) and pin 4, circuit 176 (PK/LG) harness side.
z Does the voltage vary as the volume is adjusted? Yes
INSTALL a new
subwoofer
speaker.
No
GO to
H15 .
H15 CHECK FOR AN OPEN AND SHORT TO GROUND BETWEEN THE
AFFECTED SUBWOOFER AND ITS RESPECTIVE AMPLIFIERS z
Key in OFF position.
z Disconnect: Affected Subwoofer.
z Disconnect: Respective Amplifier.
z Measure the resistance between the affected subwoofer speaker and
its respective amplifiers, and between the affected subwoofer
speaker and ground as follows:
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) Yes
INSTALL a new
subwoofer
amplifier.
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation. Klj . 22 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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amplifiers for the convertible? No
If the loud pops are from the convertible LH
subwoofer amplifier only, REPAIR circuit 173
(DG/VT). TEST the system for normal operation.
If the loud pops are from the convertible RH
subwoofer amplifier only, REPAIR circuit 174
(GY/BK). TEST the system for normal operation. Klj . 24 ba
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SPECIFICATIONS
SECTION 415-
01: Audio Unit 2003 Mustang Workshop Manual Torque Specifications
Description Nm lb-
ft lb-
in Battery ground cable bolt 10 — 89
Amplifier bracket to body nut 25 18 — Klj . 1 ba
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DESCRIPTION AND OPERATION
Audio System
The Mustang is available with the following audio systems:
zM100 CD AM/FM
z CDX6- AM/FM with six CD in- dash
z MP3 single CD AM/FM (optional)
The M100 system is equipped with four premium speakers. The CDX6 six disc changer audio unit
comes with the Mach 460 or Mach 1000 systems and speed- sensitive volume control. The Mach 460
system consists of eight speakers and two subwoofer amplifiers. The Mach 1000 option adds two
additional subwoofers and four additional amplifiers located in the luggage compartment.
Refer to the owner literature for complete audio system operating controls and functions. SECTION 415-
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DIAGNOSIS AND TESTING
Audio System
Refer to
Section 415 - 00 .
SECTION 415-
01: Audio Unit 2003 Mustang Workshop Manual Klj . 1 ba
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REMOVAL AND INSTALLATION
Audio Unit
Removal and Installation
1. Remove the instrument panel center finish panel. For additional information, refer to Section 501 - 12 .
2. Remove the audio unit. 1. Remove the screws.
2. Disconnect electrical connectors.
3. Disconnect antenna cable.
3. To install, reverse the removal procedure.
SECTION 415-
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REMOVAL AND INSTALLATION
Subwoofer Amplifier —
Convertible
Removal and Installation 1. NOTE: The convertible top needs to be in the up position to remove the subwoofer amplifiers.
From inside the luggage compartment, remove the forward panel. 1. Remove the pin- type retainers.
2. Remove the forward panel.
2. NOTE: LH and RH subwoofer amplifiers are similar.
Remove the subwoofer amplifiers. 1. Disconnect the electrical connectors.
2. Remove the nuts.
3. Remove the subwoofer amplifiers.
3. To install, reverse the removal procedure.
SECTION 415-
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Klj . 2 ba
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