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Home >> Ford >> 2009 >> Fusion S, Automatic >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Cluster Illumination & Instrument Panel Illumination >> Diagnostic Tests >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test A: The Control Illumination Is Inoperative - All Hardwired Dimmable Illumination >> Normal Operation

Normal Operation

When the parking lamps or the headlamps are on, the smart junction box (SJB) sends a reference voltage signal to the instrument panel dimmer switch on circuit VLN18 (BU/WH), which is grounded by the SJB through circuit CLN27 (WH/BN). The SJB uses the reference voltage to determine the intensity of the back lighting desired by the operator. The SJB sends a pulse-width modulated (PWM) voltage to the dimmable illumination sources on circuit VLN04 (VT/GY) based on the input received from the instrument panel dimmer switch.

This pinpoint test is intended to diagnose the following:

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