Ford Mustang (1999-2004) Service Manual: Inspection and Verification

NOTE: A new instrument cluster must be reconfigured.

NOTE: The instrument panel dimmer switch is a part of the headlamp switch.

1. Verify the customer concern.

2. Visually inspect for obvious signs of electrical damage.

Visual Inspection Chart

Electrical

  • Central junction box (CJB) fuses:

  • 5 (15A)

  • 21 (5A)

  • 34 (20A)

  • 37 (5A)

  • 32 (15A)

  • 27 (20A)

  • Circuitry

  • Damaged switch

3. If the fault is not visually evident, determine the symptom and proceed to the Symptom Chart.

Symptom Chart

Condition Possible Sources Action
  • The control illumination is inoperative
  • Central junction box (CJB) fuse 37 (5A).
  • Circuitry.
  • Headlamp switch.
  • Go To Pinpoint Test A .
  • The instrument cluster illumination is inoperative
  • Circuitry.
  • Instrument cluster.
  • Bulb(s).
  • Go To Pinpoint Test B .
  • The climate control illumination is inoperative
  • Circuitry.
  • Bulb(s).
  • Go To Pinpoint Test C .
  • The audio system illumination is inoperative
  • Circuitry.
  • Audio unit.
  • Go To Pinpoint Test D .
  • A single illumination source is inoperative
  • Circuitry.
  • Switch.
  • Go To Pinpoint Test E .
    Instrument Cluster and Panel Illumination (Diagnosis and Testing)
    Refer to Wiring Diagrams Cell 71 , Instrument Illumination for schematic and connector information. Special Tool(s) 73III Automotive Meter 105-R0057 or equivalent ...

    Pinpoint Tests
    PINPOINT TEST A: THE CONTROL ILLUMINATION IS INOPERATIVE Test Step Result / Action to Take A1 CHECK PARKING LAMPS YesPlace the headlamp switch in the OFF position. GO to A2 . No ...

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    Component Tests
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