![]() There is often one on either side of the dash to accommodate differences in sunlight exposure. Sunload sensors are usually located at the top of the dash and are often mounted on a removable plate, speaker grill, or defroster vent. Sunload sensors monitor the intensity of sunlight and adjust the HVAC control to improve the comfort level of the driver and passengers on sunny days. At least that was an easy fix.Sunlight entering a vehicle can account for up to 60% of the interior heat load that the system must overcome. I've clipped it back in and 'headlamps suggested' only came up when I drove back into the (dark) garage. ![]() When I shone the LED work light at it, the voltage changed immediately. Searching that number, I found this on eBay:ĭoes that seem like the right part and a good price? It looks like the correct part to me.īTW, my dash display for some time has been coming up with 'Headlamps suggested', and sure enough the headlamp auto control sensor had fallen out of its retainer and was sitting under the dash. On one of them it was showing as interchangable with AC Delco p/n 15-71893. The sun load sensor is GM p/n 16146093, but is showing as NLA on all the parts sites that I visited. I do want to avoid replacing them if they are okay, but if the voltage doesn't change according to light conditions, they must be faulty, right? I should add, there are no codes present and never been while I've had the car for these sensors. I can only assume that the solar sensors are faulty, because their voltages do not change with a change in light conditions. When I unplugged them, I checked resistance at both sensors – both were showing almost identical figures, about 3.4 Ohms (I think, because I am not the world's best electrical diagnostician when the multimeter was set at '20' Ohms, this reading was the result). When I unplugged one of the sensors, the Tech 2 showed that sensor's voltage at 5.00v. ![]() ![]() I did wait perhaps 30-40 seconds when going from dark to light to see if the sensors were slow to respond, but even then there was no change. The voltages do not change at the sensors, according to the Tech 2, with changes in light as described above. In my driveway in daylight, I tried firstly covering the sensors with a black cloth and then removing it, and shining a bright LED work light directly at the sensors (one at a time). I have a Tech 2 scanner and it shows a voltage of about 4.6v for both solar sensors.įrom what I understand, the solar sensor voltage should change according to light conditions. In chasing down a problem I have with a passenger side air door, (see this thread here I have discovered that the solar sensors might be faulty. I'm wondering if you guys know much about the solar sensors (or sun load sensors, ALLDATAdiy uses both terms to describe these). ![]()
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