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 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 illumination sources are grounded through circuit 57 (BK).