Normal Operation

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).