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Why would the headlights on a 2006 Saab 9-3 come on by themselves while the car is off and parked?

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Possibly a problem with the computer that controls them (which might be the BCM - Body Control Module, or might be a separate dedicated module).

A friend of mine had the same problem with a 2001 BMW, and water had got into said module through a perished seal and shorted a number of connections within it, causing the lights to go on and off at seemingly random times...

  • Moisture ingress could definitely be contributing to this problem. – Steve Matthews Aug 28 '15 at 11:59

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