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Which precaution applies when measuring parasitic drain?

  • A.Switch on the ignition
  • B.Open the driver's door, which wakes the modules and therefore allows the whole of the drain to be measured at once
  • C.Allow all modules to enter sleep mode before reading
  • D.Read immediately after connecting the meter, which gives the true drain before the modules can be disturbed

Answer: C

Modules stay awake for many minutes after the doors are closed, so an immediate reading is misleadingly high. Waking them deliberately is exactly the wrong approach. Patience is the main requirement of the test. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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