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Old 07-12-2003, 01:57 AM   #21
Scooby Newbie
Member#: 36575
Join Date: May 2003
Chapter/Region: E. Canada
Location: Ontario, Canada
'04 STi

Default Auto Off

Originally posted by Ulf Wafflestein
I actually think it has something to do with the HID lights. On my mom's porsche, even when you leave the lights in the on position, they don't remain on when the car is turned off. Doesn't the arc inside the bulb need a lot of energy to spark or light, or whatever the term is for igniting the xenon gas, and then only requires a little bit of energy to stay on?
Even the Canadian cars without HID's shut the headlights off, even though the engineering was probably done for that reason.

The HID bulbs are ~35W (versus ~65W for Halogen) so they do use less energy. I think the HID's use a capacitor charge though to ignite them. Thus, there might be drain on that circuit as well? I don't know.

Acura lets you leave your HID's on for 15 minutes before shutting them off for you.

Oh, and our 1990 and 1994 GM's had auto-lights that not only shut themselves off, but also turned themselves on when it got dark!! A piece of technology that still seems to baffle the Japanese manufacturers....
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