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Turns out it's a solar sensor specifically for the A/C system, though I still don't know exactly how it influences the A/C functions.

I'm trying to find out what the "sensor" to the right of the front window defrost vent in my '90 LS400 is for. The car doesn't appear to have an auto headlight setting which is what some folks have said the sensor is for.

Just got the foam surround on the subwoofer in my '90 LS400 replaced by SimplySpeakers.com for $40 and it sounds great. Granted, it's not cranking out the bass a high powere subwoofer would, but the stock Pioneer system sounds pretty good with the woofer repaired.

Check out http://www.practicalmachinist.com. Large forum with an active membership.