The core function of the body control module (BCM) is to monitor inputs such as the state of the high-beam switch and enable or disable power to the corresponding loads such as the high-beam lamp. The BCM also includes circuits that monitor different functions for faults. When a fault is detected, the driver could be notified, in some cases additional circuits in the BCM drive the load to the default state determined by the limp home requirements.
The three application briefs referenced in this article discuss optimal circuits to monitor inputs in 24-V systems, to drive inductive circuits such as relays and to detect open lamp load condition and to transition the BCM operation to limp home mode.
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