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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 578 (Instrument Cluster And Panel Illumination) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test D: One Or More Module-Controlled Illumination Source(s) Is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

The smart junction box (SJB) sends a pulse-width modulated (PWM) voltage to the dimmable components, based on input received from the instrument panel dimmer switch, through circuit 1417 (LG/RD) and 1418 (LB/WH). Ground for the illumination source is supplied through circuit 1205 (BK).

The SJB sets diagnostic trouble code (DTC) B2026 if circuit 1418 (LB/WH) is short to ground. The SJB sets DTC B2027 if circuit 1417 (LG/RD) is short to ground.

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