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Home >> Ford >> 2005 >> Mustang Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster And Panel Illumination >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Test A: The Control Illumination is Inoperative >> Normal Operation

Normal Operation

When the headlamp switch is placed in the PARK or headlamp ON position, the smart junction box (SJB) supplies either a pulse width modulated (PWM) signal or 12 volts to the various backlighting sources in the instrument panel, doors and console.

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