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Symptom Chart

WARNING: This page is about a different car, the 2003 Mercury Mountaineer and 2003 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM CHART

Condition Possible Sources Action
The audio unit display is blank - audio unit operates
  • Audio unit.
 REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.
The audio unit/tape player display is blank - the audio unit/tape player operates
  • Audio unit.
 REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.
The cassette player only is inoperative-M100C and DM100
  • Audio unit.
 REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.
During CD mode, the audio unit display shows: NO CD
  • No CD found.
 NO CD is displayed when a CD is not found in a slot.
One or more audio control buttons (such as volume, seek, tune and scan) is not functional in either radio, tape mode or all modes - audio unit display functions correctly
  • Audio unit.
 REMOVE the audio unit and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.
When the headlamp switch is in PARK or ON position, there is no front audio unit backlighting - all other backlighting functions are normal
  • Circuitry.
  • Audio unit.
 REFER to INFROMATION, GAUGES AND WARNING DEVICES .
The audio unit is inoperative/does not operate correctly
  • Central junction box (CJB) fuse:
    • 3 (20A).
    • 28 (5A).
    • 29 (10A).
  • Circuitry.
  • Audio unit.
  • Ignition switch.
 Go To PINPOINT TEST A .
Poor reception
  • Antenna.
  • Antenna connections.
  • Noise suppression equipment.
  • Audio unit.
 Go To PINPOINT TEST B .
Continuous SEEK/SCAN in AM/FM
  • Antenna.
  • Antenna connections.
  • Noise suppression equipment.
  • Audio unit.
 Go To PINPOINT TEST B .
No sound from one or more of the speakers - not all speakers
  • Speaker(s).
  • Circuitry.
  • Audio unit.
 Go To PINPOINT TEST C .
No sound from all speakers
  • Audio unit.
 Go To PINPOINT TEST D .
Poor quality/distorted sound from one or more speakers (not all speakers)
  • Speaker(s).
  • Circuitry.
  • Audio unit.
 Go To PINPOINT TEST C .
Poor quality/distorted sound from all speakers
  • Audio unit.
 		 Go To PINPOINT TEST D .
The subwoofer is inoperative
  • Central Junction Box (CJB) fuse 3 (20A)
  • Circuitry.
  • Subwoofer.
  • Subwoofer amplifier.
  • Audio unit.
 Go To PINPOINT TEST E .
Loud popping sound from speaker(s)
  • Circuitry.
  • Subwoofer amplifier.
  • Audio unit.
 Go To PINPOINT TEST F .
The auxiliary audio control is inoperative - steering wheel audio control switch(es)
  • Circuitry.
  • Steering wheel control switch(es).
  • Steering wheel control switch harness.
  • Powertrain control module (PCM).
  • Audio unit.
 Go To PINPOINT TEST G .
The audio unit does not operate correctly - speed sensitive volume (SSV)
  • Circuitry.
  • Audio unit.
 Go To PINPOINT TEST H .
The video system is inoperative
  • Central junction box (CJB) fuse 3 (20A)
  • Circuitry
  • Digital versatile disc (DVD) unit
 Go To PINPOINT TEST I .
The video system does not operate correctly-no sound from one or more speakers, not all speakers
  • Central junction box (CJB) fuse 3 (20A)
  • Circuitry
  • Digital versatile disc (DVD) unit
  • Audio unit
 Go To PINPOINT TEST J .
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