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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 415 (Instrument Cluster System And Panel Illumination) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Test A: 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 Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The instrument panel dimmer switch is an input to the instrument cluster through circuit 1011 (TN/OG). The instrument panel dimmer switch is grounded through circuit 570 (BK/WH). The instrument cluster monitors the medium-speed controller area network (MS CAN) bus on circuits 1848 (PK/OG) and 1847 (WH/OG) for a headlamps ON message. The headlamps ON message is generated by the smart junction box (SJB). When the instrument cluster detects a headlamps ON message, it sends a variable voltage to the module-controlled illumination sources through circuit 19 (LB/RD). The module-controlled and non-dimmable illumination sources are grounded through circuits 57 (BK) and 570 (BK/WH).

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