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act as the "brains" of the body electronics. If a headlight fails, it is rarely a simple blown fuse; the diagram often reveals a complex logic path where the BHM monitors current draw and shuts down a circuit if it detects a short. Without a visual map of these modules, pinpointing a failure point becomes an exercise in frustration. Grounding and Signal Integrity

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Look for notations like C104 , C211 , or X300 . These refer to specific connector locations. The manual should include a showing where to find these plugs under the dash, hood, or chassis. act as the "brains" of the body electronics