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Which reason forbids testing an airbag circuit with a multimeter?

  • A.The meter would be damaged, which is why only approved diagnostic equipment may be used upon such a circuit
  • B.No reason
  • C.An ordinary instrument may pass sufficient current through the bridge wire to ignite the charge and deploy the bag
  • D.The meter's test current can fire the initiator

Answer: D

A few milliamps through the bridge wire is enough to fire it. The last option explains exactly that mechanism, which makes it a correct and more instructive version. Only approved equipment is used. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The shared behaviour explains why these belong together and the differences explain why both exist. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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