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Corvette
C7 Forum
Getting manual control of headlights
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<blockquote data-quote="Afterimage" data-source="post: 262960" data-attributes="member: 7676"><p>Got the items I needed earlier today and I got the sensor to work in the house mocked up on the breadboard with a little light that will come on when no light is shining on it and off when I held a flashlight to the diode. Now in the house and this mock up on the board the voltages are going to be "slightly" different than when it's powered up in the car but it gives me a close enough scenario where I'm able to test it.</p><p></p><p>According to the SM, the sensor gets a reference voltage from the BCM (5V) and through the photo diode depending on lighting conditions it will send a voltage of anywhere from 0.4V to 5V to the HVAC module where it goes to a ground after the module. In the house (with the light on) I'm getting an output voltage of about 2.1-2.2V and with the flashlight shining on the diode it drops down to 1.7-1.9V which is enough to turn the light off.</p><p></p><p>Light from a flashlight (what I'm using in the house) is different than actual sunlight so I expect the voltages to be different, and I'm sure there's probably a circuit of some kind in the BCM where there could be a built in delay before it will command the lights to be on or off based on light input. As of right now the lower the output voltage # below 2V the light will stay off, above 2V it will come on so the 2V cutoff seems to be where it dictates whether the lights will be on or off. To keep the lights off permanently an output voltage of around 1V should do the trick.</p><p></p><p>I'll upload a video sometime tomorrow of my mad experiment so you can see what the deal is with trying to gain manual control of these stupid auto hdlts.</p></blockquote><p></p>
[QUOTE="Afterimage, post: 262960, member: 7676"] Got the items I needed earlier today and I got the sensor to work in the house mocked up on the breadboard with a little light that will come on when no light is shining on it and off when I held a flashlight to the diode. Now in the house and this mock up on the board the voltages are going to be "slightly" different than when it's powered up in the car but it gives me a close enough scenario where I'm able to test it. According to the SM, the sensor gets a reference voltage from the BCM (5V) and through the photo diode depending on lighting conditions it will send a voltage of anywhere from 0.4V to 5V to the HVAC module where it goes to a ground after the module. In the house (with the light on) I'm getting an output voltage of about 2.1-2.2V and with the flashlight shining on the diode it drops down to 1.7-1.9V which is enough to turn the light off. Light from a flashlight (what I'm using in the house) is different than actual sunlight so I expect the voltages to be different, and I'm sure there's probably a circuit of some kind in the BCM where there could be a built in delay before it will command the lights to be on or off based on light input. As of right now the lower the output voltage # below 2V the light will stay off, above 2V it will come on so the 2V cutoff seems to be where it dictates whether the lights will be on or off. To keep the lights off permanently an output voltage of around 1V should do the trick. I'll upload a video sometime tomorrow of my mad experiment so you can see what the deal is with trying to gain manual control of these stupid auto hdlts. [/QUOTE]
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Corvette
C7 Forum
Getting manual control of headlights
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