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Which network fault presents as a vehicle that will not unlock or start?

  • A.No such fault
  • B.A bus failure preventing the body controller from communicating with the immobiliser and the engine control unit
  • C.A total loss of communication on the body network
  • D.A single module fault, which would affect only the function that module provides and not the whole vehicle

Answer: C

The unlocking and starting sequence depends on several modules agreeing over the network. The last option describes exactly that dependency, which makes it a correct and more specific version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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