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Which module commonly acts as the network master for sleep and wake?

  • A.The body controller, which monitors the doors, the key and the switches and therefore decides when the network sleeps
  • B.The body control module
  • C.The engine control unit, which is the most powerful module and therefore manages the state of the whole network
  • D.The instrument cluster

Answer: B

The body controller sees the door switches, the key and the locking and is best placed to decide. The last option explains exactly why, which makes it a correct and more instructive version of the same answer. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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