2003 FORD MUSTANG Workshop Manual

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Page 3409 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is voltage indicated? H5 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
u

Page 3410 of 4378

FORD MUSTANG 2003 Workshop Manual subwoofer amplifier C4109b pin 2, circuit 694 (BK/LG), harness side
and ground; and between the subwoofer amplifier C4109b pin 3,
circuit 694 (BK/LG), harness side and ground.
�z Are the resistance

subwoofer amplifier C4109b pin 2, circuit 694 (BK/LG), harness side
and ground; and between the subwoofer amplifier C4109b pin 3,
circuit 694 (BK/LG), harness side and ground.
z Are the resistances less than 5 ohms? No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation.
H8 CHECK THE SUBWOOFER ENABLE CIRCUIT FOR POWER
z
Key in OFF position.
z Disconnect: Subwoofer Amplifier C4109b.
z Key in ON position.
z With the audio unit turned on, measure the voltage between the
subwoofer amplifier C4109b pin 2, circuit 173 (DG/VT), harness side
and ground.
z Is voltage indicated? Yes
GO to
H9 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation. H9 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
H10 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal
operation. H10 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 affected amplifier harness pins 1 and
2, circuit 828 (VT/LB) (left amplifiers) and ground, and between pins
4 and 5, circuit 829 (WH/VT) (right amplifiers) and ground. Yes
GO to
H11 .
No
REPAIR the circuit
(s) in question.
TEST the system
for normal Klj . 20 ba
242003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Page 3411 of 4378

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 amplif

Page 3412 of 4378

FORD MUSTANG 2003 Workshop Manual �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

Page 3413 of 4378

FORD MUSTANG 2003 Workshop Manual 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

Page 3414 of 4378

FORD MUSTANG 2003 Workshop Manual 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 fr

Page 3415 of 4378

FORD MUSTANG 2003 Workshop Manual 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

Page 3416 of 4378

FORD MUSTANG 2003 Workshop Manual 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 s

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