Normal Operation

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

Under normal operation the instrument cluster communicates interactively with other electronic modules using the CAN circuits and the UART-based protocol (UBP) communication network. CAN communication is accomplished through the use of an unshielded, twisted pair cable data bus line, circuits 3125 (TN/YE) and 3126 (TN/YE). UBP communication is accomplished through a single data bus line, circuit 693 (OG). For additional information about the communications network, refer to MODULE COMMUNICATIONS NETWORK . With the key in the START/RUN position, the instrument cluster receives power from the CJB fuse 21 (5A), circuit 489 (PK/BK). When in the RUN/ACC position, power is received from the CJB fuse 15 (5A), circuit 295 (LB/PK). With the ignition in the OFF position, the instrument cluster receives its keep-alive power from the battery junction box (BJB) fuse 49 (15A), circuit 3049 (BK/LG). The instrument cluster grounding is accomplished through circuit 1203 (BK/LB) and the bulb grounding is accomplished through circuit 1205 (BK).