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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 E: All Control Illumination Sources Do Not Dim >> 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.

For hardwired dimmable illumination sources, the SJB sends a pulse-width modulated (PWM) voltage on circuit VLN04 (VT/GY) and CLN04 (BU/BN) (Fusion, Milan only) based on the input received from the instrument panel dimmer switch.

For network controlled illumination sources, the SJB sends a message via the medium speed controller area network (MS-CAN). If the module receiving the back lighting message either does not receive the message or receives invalid data for greater than 5 seconds, the module defaults to full nighttime intensity. Full nighttime intensity is equivalent to the illumination level when the parking lamps are on, and the instrument panel dimmer switch is in the highest setting.

This pinpoint test is intended to diagnose the following:

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