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Auxiliary Heating

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Old Mar 29, 2025 | 08:18 PM
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From: Alien Town Roswell NM
2014 S550
Auxiliary Heating

Took a 200 mile road trip today and on the way home, I noticed that when I changed the temperature that the settings weren't showing up on the bottom of the screen like they always have.

Selecting Menu for climate control showed one option - Auxiliary Heating. The AC still worked fine but I couldn't see any of the settings.

I took a few photos of the display and am curious if anyone else knows what this setting is and how do you enable/disable it. It shows 3 levels and when I select one of them, the clock/timer appears...



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Old Mar 29, 2025 | 08:35 PM
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Originally Posted by James S
Took a 200 mile road trip today and on the way home, I noticed that when I changed the temperature that the settings weren't showing up on the bottom of the screen like they always have.

Selecting Menu for climate control showed one option - Auxiliary Heating. The AC still worked fine but I couldn't see any of the settings.

I took a few photos of the display and am curious if anyone else knows what this setting is and how do you enable/disable it. It shows 3 levels and when I select one of them, the clock/timer appears...
https://cimg5.ibsrv.net/gimg/www.mbw...7bf328203b.jpg
https://cimg2.ibsrv.net/gimg/www.mbw...9bb0de2577.jpg
https://cimg1.ibsrv.net/gimg/www.mbw...bd5b7c7c9f.jpg
Hopefully this helps: http://mbworld.org/forums/e-class-w2...questions.html
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Old Mar 29, 2025 | 08:40 PM
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Just realized the link I provided is from an E-Class, hopefully still helps.
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Old Mar 29, 2025 | 08:41 PM
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From: Alien Town Roswell NM
2014 S550
Appreciate the quick response but mine is a US spec car without an additional fueled heater which sounds like something a Euro spec may have.
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Old Mar 29, 2025 | 09:07 PM
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Originally Posted by James S
Appreciate the quick response but mine is a US spec car without an additional fueled heater which sounds like something a Euro spec may have.
I see, sorry that I wasn't able to help. This is a tricky one and I guess a rather rare option on US cars. Need actual owners to chime in.
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Old Mar 29, 2025 | 09:18 PM
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From: Alien Town Roswell NM
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Much appreciated.

I believe it is some kind of glitch as I've owned the car for a year now and have never seen that. After getting back home, I can't get it to appear again and the temperature controls now show up like they're supposed to.

I may replace or at least order a new auxiliary battery as I've heard that they can cause things to start acting up. Haven't heard of one making options appear that aren't installed on the car but I do live in the land of aliens so I reckon anything can happen. 😀

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Old Mar 29, 2025 | 09:44 PM
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Originally Posted by James S
Much appreciated.

I believe it is some kind of glitch as I've owned the car for a year now and have never seen that. After getting back home, I can't get it to appear again and the temperature controls now show up like they're supposed to.

I may replace or at least order a new auxiliary battery as I've heard that they can cause things to start acting up. Haven't heard of one making options appear that aren't installed on the car but I do live in the land of aliens so I reckon anything can happen. 😀
You're most welcome : )

I see, hopefully it stays fixed now.
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Old Mar 30, 2025 | 09:33 PM
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You likely had a temporary communication error from the HVAC unit. Monitor and if recurring inspect wiring.
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Old Mar 30, 2025 | 09:35 PM
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From: Alien Town Roswell NM
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Thanks and will do!
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Old Mar 30, 2025 | 11:45 PM
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Originally Posted by VII
You likely had a temporary communication error from the HVAC unit. Monitor and if recurring inspect wiring.
That got me curious, were there any codes in the computer stored?
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Old Mar 30, 2025 | 11:47 PM
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From: Alien Town Roswell NM
2014 S550
I'll check tomorrow to see if any codes were stored.
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Old Mar 30, 2025 | 11:57 PM
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Originally Posted by James S
I'll check tomorrow to see if any codes were stored.
Sounds good, hope everything checks out. Might need a scanner that can read mb specific codes. Very generic ones might not read everything. Do you have XENTRY?
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Old Mar 31, 2025 | 12:09 AM
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From: Alien Town Roswell NM
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I've got a ThinkDiag 2 I believe.
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Old Mar 31, 2025 | 08:43 AM
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Originally Posted by James S
I've got a ThinkDiag 2 I believe.
I see, that should pick things up.
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