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Which waiting period applies after isolating a vehicle for airbag work?

  • A.No waiting period, since the airbag system is de-energised immediately when the battery is disconnected
  • B.One hour in every case
  • C.The time taken for the warning lamp to extinguish, which indicates that the system has discharged completely
  • D.A specified time for the reserve capacitor to discharge

Answer: D

A reserve capacitor can fire an airbag for a minute or more after isolation, so the manufacturer's waiting time is observed. The lamp is not powered once isolated, which makes the last option impossible in practice. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape. The shared behaviour explains why these belong together and the differences explain why both exist.

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