To answer question 1.
Normally bulb self check systems work by sending a pulse of electrical current through the bulb circuit and measuring what happens. If no electrical current comes back through the circuit then the system assumes the bulb has failed.
Very unusual for both headlight bulbs to blow at the same time. Happened to me once with a Peugeot 305 when the voltage regulator failed. The resulting voltage spikes saw off the headlight bulbs very quickly.
Edit:Zero beat me by 60 seconds.
Last edited by: Bagpuss on Wed 20 Oct 10 at 22:12
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