C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Light sensor

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Old Jun 4, 2021 | 09:00 AM
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Beater12's Avatar
Beater12
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From: Ontario, Canada
Default Light sensor

I am in Canada so have a light sensor on my 90 that opens and turns on the headlights if it is dim outside. It also does it when you pull in the garage, go under shaded trees or it is overcast PITA. I was told how to override it by putting a fuse in in place of the sensor. The sensor, so I'm told is in front of the driver on the dash top. Problem is if this is the sensor it should be very easy to test by blocking the light. When I put my finger over it I would expect the headlights to come on but they don't. Is there something I'm missing or am I blocking the wrong sensor?
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Old Jun 4, 2021 | 09:25 AM
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Nomake Wan's Avatar
Nomake Wan
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From: Orange, CA
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Originally Posted by Beater12
I am in Canada so have a light sensor on my 90 that opens and turns on the headlights if it is dim outside. It also does it when you pull in the garage, go under shaded trees or it is overcast PITA. I was told how to override it by putting a fuse in in place of the sensor. The sensor, so I'm told is in front of the driver on the dash top. Problem is if this is the sensor it should be very easy to test by blocking the light. When I put my finger over it I would expect the headlights to come on but they don't. Is there something I'm missing or am I blocking the wrong sensor?
I don't think you're blocking the wrong sensor--it's the one on top of the instrument panel directly ahead of the driver. What I'm guessing is actually happening is that your finger isn't enough to actually block all light input from reaching the sensor. Try blocking it with something that completely encloses the sensor, like electrical tape.

EDIT: Also note that the DRL system is defeated if the parking brake is on. So if you were trying to trigger it while parked with the parking brake on, it wouldn't work.

Last edited by Nomake Wan; Jun 4, 2021 at 09:49 AM.
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