Question about the Headlights
- Thread starter callmebob
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sanman28
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I got a 378 sensor off eBay. Just put it on and so far it functions correctly. Was advertised as new but open box or old stock.
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nick14226
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Always a chance something else is going on, but yeah, I think the older s/n’s are closer to starting with 15____
What was your serial number? Bought one “new” on eBay that also appears to be open box. S/N 1461105118.
Update - it worked! The DRL are probably 3x brighter than the parking lights. I didn’t fully remove the panel, just the front few clips. Slid my hand under and was able to pop one side of the sensor then removed from above.
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sanman28
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Rock n roll
vwfast
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Wondering if the stock might be replenishing? I ordered one through my local dealer a couple of weeks ago, when they said they were backordered nationally with no ETA, and they just called to say they got it in.
johnnyjr79
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I too received the call from the dealer stating they had a new sensor in for my Tahoe. I’m literally at the dealer right now and the replacement sensor also has the same problem and did not correct the issue.
vwfast
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Crap! I was afraid of that. I'm scheduled to get mine replaced on Monday. -sigh
Update: Ordered another off eBay and the serial # started much lower (130 or something). It has been installed, and DRL and headlights now work properly. RA wouldn’t accept my return. I invested a total of about $30 between eBay and RA. Worth it to have the problem corrected.
I have a 2022 Denali XL. Ordered and purchased new in May. I have the headlamp issue as well. Took it to the dealership, they diagnosis the issue. Ordered a new sensor. 4 weeks later sensor in and they installed. Still having the same issue. Advisor and tech are reaching out to GM for help.
I am trying to do the tape mod. Can’t get the placement right. If you have done the tape mod, can you please send a photo of where your tape is placed on the sensor? Thanks for the help! Crazy issue on a $80k car.
I am trying to do the tape mod. Can’t get the placement right. If you have done the tape mod, can you please send a photo of where your tape is placed on the sensor? Thanks for the help! Crazy issue on a $80k car.
Check my previous post. Probably on previous page. Tape mod is probably 80-85% efficient.
Update here. I just spoke to the dealership. They called me to follow up. Technician emailed GM directly. GM came back and said that it’s not a sensor part issue, it’s a software issue and GM is working on a update to the system that will take place reprogramming the sensor. GM is aware of numerous cases. They will advise once an update is available.
Follow up to the tape. I put the tape on the back half of the sensor all the way across it, works fine.
Follow up to the tape. I put the tape on the back half of the sensor all the way across it, works fine.
WalleyeMikeIII
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Well, my GUESS is that GM had to source a second sensor part number, which has slightly different output than the original, and they didn't catch it.
One solution is swapping the sensor so it works with the non-updated software.
The other is fix the software to accept the new sensor.
GM figures the former is more costly than the latter.
This, of course, is all conjecture by me, but many have reported that replacing the sensor fixes the issue...
Make sure your auto wipers are not on which will cause the headlights to come on.
Please see page 144
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Lights On with Wipers
If the windshield wipers are activated in daylight with the engine on, and the exterior lamp control is in AUTO, the headlamps, parking lamps, and other exterior lamps come on.
When the wipers are not operating, these lamps turn off. Move the exterior lamp control to O or ; to disable this feature.
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WalleyeMikeIII
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Wipers in AUTO will not make the headlights come on, the wipers actually need to activate (ie it has to be raining, and more than a mist) for the headlights to come on.
*insert multiple face palm emojis *
nick14226
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Glad I held onto my original sensor, after the software update my new-old one may not work anymore and I’ll have to switch back
Buffalown
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I am having this same issue. I went into the dealer for the first oil change and asked them to check it out. I even told them about various other people having the same problem on this forum. They ran all the tests on the sensor and everything came back ok or so they say. I had the service advisor come out to the vehicle to show him that it is definitely not working correctly and he insisted that when the daytime running lights are activated the headlights should also be on which makes absolutely no sense to me. He covered up the sensor and the headlights stay on, daytime running lights go off. Uncover the sensor in full sun the headlights stay on along with daytime running lights. They won't do anything about it because as they say that's how its supposed to work and the sensor isn't throwing any errors.
Same boat as the rest of you in 22 Yukon AT4 got last week. Dealership claims it's normal and won't replace the sensor since they don't use their brains and instead follow what a computer tells them. Meanwhile a Sierra's drive out the service center with it's DRLs working normal. Very irritating. Doing the tape job and will try a different dealership next week.
