Heads Up Display Inoperative
Thread Starter
Banned
Joined: Jun 2019
Posts: 354
Likes: 122
2020 GLE 350
Heads Up Display Inoperative
Got this notification this morning. Restarting vehicle was no help. Search of forum was no help. Any suggestion before I contact the dealer? (I prefer not to do that until this virus stuff is over!)
Super Member
Joined: Jan 2020
Posts: 791
Likes: 412
From: Fredericksburg, VA
2020 Mercedes GLE350 4Matic; 2023 Tesla Model Y
Thread Starter
Banned
Joined: Jun 2019
Posts: 354
Likes: 122
2020 GLE 350
Super Member
Joined: Jan 2020
Posts: 791
Likes: 412
From: Fredericksburg, VA
2020 Mercedes GLE350 4Matic; 2023 Tesla Model Y
That happened to me when I first got the car, I was messing around with the display buttons on the steering wheel and managed to inadvertently turn the HUD off. So I asked Mercedes to "Turn on the Heads Up Display" and she did. You can also ask her to turn it off.
Super Member
Joined: Jan 2020
Posts: 791
Likes: 412
From: Fredericksburg, VA
2020 Mercedes GLE350 4Matic; 2023 Tesla Model Y
I had something similar happen with the DISTRONIC cruise control on two occasions. When I went to turn the system on, I received a "Driver Assist Inoperative" message on the driver's MBUX screen. I turned off the vehicle and restarted, and the DISTRONIC started working. Took it into the dealer thinking it was S/W related, but they checked for codes. The service tech found codes UO429EA, U110EFB, and U110EFD. The Dealer ended up replacing my Steering Wheel Electronics Module and the Steering Wheel Button, and the problem has not has not reoccurred.
Something similar may be going on with the HUD.
Senior Member
Joined: Jul 2018
Posts: 468
Likes: 91
From: Port St. Lucie, Fl
2026 GLE 450 (Black on Brown Saddle)
I had the same issue of the HUD not working on our 2019 CLS 450. I came home and started the car again, and the system worked. No issues since. The dealer told me that due to the complexity of these electronic systems, non-recurring glitches will happen on and off. 
