Automatic Highbeam / LDW Issues Only at Night

[crspangenberg]

Hello wonderful forum folks.

 

I have a 2022 GMC Sierra 2500 HD AT4 with 38,000 Miles (just outside of bumper to bumper). Dumb me, I have had this issue for awhile and haven't brough the truck in, so now it's on me to correct.

 

I brought the truck in yesterday and explained the situation. When I first start up the truck, the Green Automatic High Beam rediness light on the dash turns on, and for the first mile or so of my drive if the conditions call for it, the auto highbeams will function normally. After this mile or, usually less then 5 minutes of driving, regardless of road conditions, that green light will go out, along with the lane departure warning readiness light, and will not come back on.

 

If I push the button at the end of stalk to active the auto highbeams, it does nothing. If I push the LDW button on the center stack, I get the message that "Lane Departure Warning is Unavailable".

 

This problem will continue for the duration of the drive, regardless of if the road marking are freshly painted with new reflectors or old. 

The odd thing is during the day, and even during the rain when I can't see the road markings, lane departure will never fail.

 

As a proof of issue, last night I recorded the dash and road conditions, until everything failed, and then I restarted the truck and drove the same roads and they worked fine, for the same period of time, and then died out again.

 

Has anyone else expireinced this issue? Is there a GM Tech, that could send me the programming / calibration instructions for Auto High Beam / LDW? Wondering if this is something I can fix on my own.

 

Youtube 1: 2:29 Where System Fails.

 

Youtube 2: 2:46 in and the system fails again.

 

[Crazy Canuck]

Both of those systems utilize the camera in the windshield i believe.  Are you fogging up?  Anything else in the way?

[crspangenberg]

Thank you for your reply. No fogging up, nothing obstructing the camera's view. The dealership ended up replacing the camera yesterday and within 10 minutes of driving, the system ended up doing the same thing. 

 

However the dealership could not replicate the issue.

[crspangenberg]

So I believe I have solved this issue.

 

It turns out that my dash cam was causing this, I had unplugged my dashcam before, but never disconnected the fuse taps from the source.

 

For reference I used the following fuses in the passenger side fuse box:

F58 - 15A - Info2 - Constant

F20 - 15A - Cool Seat - Switched

 

After digging through the wiring Diagrams and All-Data, Info 2 is related to A11 Radio Module. For whatever reason the A11 Radio Module communicates with the Front View Camera / Lane Departure system but indirectly based on the communications wiring diagram.

 

Disconnecting the dash cam caused the camera and lane departure to function as designed.

 

I now have the dash cam connected to F5 and F43 and I have not experience the same issues. Not sure if this was fluke, but boy I can't imagine why this would have caused any issues, other then potentially bringing the system voltage below a specified threshold.

 

[crspangenberg]

Update - Issue still exists. I have given up.

[ShotgunZ71]

My 2001 High Country did the same thing. Sometimes they'd work, sometimes they wouldn't. Pretty sure it was a camera issue. Don't have the truck anymore to try different remedies.