HUD dim at night

Errowen · 03-29-2018, 07:03 PM

On my 640i GC, head up display is perfectly visible during the day (intensity set on midpoint) but extremely dim at night (even with intensity fully turned up). Once the numbers change colour for night mode, the orange and white parts are practically invisible against a grey road surface. (No such issue in my 535i which also has HUD.)

Anyone else experienced this?

Any cure?

elvisisdog · 03-30-2018, 09:12 AM

Have you got the internal cabin lights turned right down? I'm sure the HUD trains to the brightness of the internal lights. Try the little dial next to your head light switch.

babaikram · 03-30-2018, 11:32 AM

You can also adjust the brightness of the HUD on idrive

Errowen · 03-30-2018, 02:11 PM

Quote:

Originally Posted by elvisisdog

Have you got the internal cabin lights turned right down? I'm sure the HUD trains to the brightness of the internal lights. Try the little dial next to your head light switch.

Thanks - will try.

6coupe · 04-01-2018, 05:25 PM

As mentioned, the HUD brightness is controlled via iDrive. I find it best to have it just bright enough not to see the 'box' around it, so just the numbers are clear in the dark. You'll notice the HUD will brighten automatically in strong sunlight too.

murph914 · 04-11-2018, 02:55 PM

did you get anywhere with this?

Bored of Audi · 04-12-2018, 04:49 AM

its should also dim and brighten dependant on what is on front.

when sat in traffic with break llights on in front then the HUD brightens up when on the open road it dims but it still visable.

I wonder if it has dimmed to much and no longer responding to whats in front.

murph914 · 04-12-2018, 08:44 AM

Quote:

Originally Posted by Bored of Audi

its should also dim and brighten dependant on what is on front.

when sat in traffic with break llights on in front then the HUD brightens up when on the open road it dims but it still visable.

I wonder if it has dimmed to much and no longer responding to whats in front.

I was wondering if the light sensor was covered by something. But I am not even sure where the sensor is. Such an odd problem to have makes me curious what's going on.

upstate650 · 04-12-2018, 09:06 AM

Quote:

Originally Posted by murph914

I was wondering if the light sensor was covered by something. But I am not even sure where the sensor is. Such an odd problem to have makes me curious what's going on.

In pre-connected drive vehicles, it was on the back of the rear view mirror. It may be part of the connected drive contraption at the center/top of the windshield now.

Errowen · 04-13-2018, 06:21 PM

I think the original issue was frost-whitened road surfaces at night, which can be highly reflective of the headlights and were drowning out the HUD. Now that roads are darker, the contrast level is OK.

03-29-2018, 07:03 PM	#1
Errowen Private 16 Rep 97 Posts Drives: 2016 640i xDr GC MSport Join Date: Oct 2012 Location: Cobourg, Ontario Canada iTrader: (0) Garage List 2012 BMW 135i MSport [0.00] 2016 BMW 640i Gran ... [0.00] 2011 BMW 535i XDriv ... [0.00]	HUD dim at night On my 640i GC, head up display is perfectly visible during the day (intensity set on midpoint) but extremely dim at night (even with intensity fully turned up). Once the numbers change colour for night mode, the orange and white parts are practically invisible against a grey road surface. (No such issue in my 535i which also has HUD.) Anyone else experienced this? Any cure?
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03-30-2018, 09:12 AM	#2
elvisisdog Second Lieutenant 34 Rep 209 Posts Drives: F06 MSport 2013/09 Join Date: Jan 2017 Location: UK iTrader: (0)	Have you got the internal cabin lights turned right down? I'm sure the HUD trains to the brightness of the internal lights. Try the little dial next to your head light switch.
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03-30-2018, 11:32 AM	#3
babaikram M6GCComp, Porsche Cayman S PDK, Peug 208 GT1 BPS 512 Rep 1,280 Posts Drives: . Join Date: May 2015 Location: England iTrader: (0)	You can also adjust the brightness of the HUD on idrive
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04-01-2018, 05:25 PM	#5
6coupe Private First Class 29 Rep 133 Posts Drives: M6 GC Join Date: May 2016 Location: UK iTrader: (0)	As mentioned, the HUD brightness is controlled via iDrive. I find it best to have it just bright enough not to see the 'box' around it, so just the numbers are clear in the dark. You'll notice the HUD will brighten automatically in strong sunlight too.
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04-11-2018, 02:55 PM	#6
murph914 Second Lieutenant 66 Rep 282 Posts Drives: 2014 650i Convertible Join Date: May 2007 Location: Massachusetts iTrader: (0)	did you get anywhere with this?
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04-12-2018, 04:49 AM	#7
Bored of Audi Lieutenant 74 Rep 433 Posts Drives: X3 40D Msport+ in Blue Join Date: Feb 2013 Location: United Kingdom iTrader: (0)	its should also dim and brighten dependant on what is on front. when sat in traffic with break llights on in front then the HUD brightens up when on the open road it dims but it still visable. I wonder if it has dimmed to much and no longer responding to whats in front. __________________ David - Bored with Audi MY2019 X3 40D M-sport with all the toys. Also a Mini CS for the wife and me to play in at the weekends
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04-13-2018, 06:21 PM	#10
Errowen Private 16 Rep 97 Posts Drives: 2016 640i xDr GC MSport Join Date: Oct 2012 Location: Cobourg, Ontario Canada iTrader: (0) Garage List 2012 BMW 135i MSport [0.00] 2016 BMW 640i Gran ... [0.00] 2011 BMW 535i XDriv ... [0.00]	I think the original issue was frost-whitened road surfaces at night, which can be highly reflective of the headlights and were drowning out the HUD. Now that roads are darker, the contrast level is OK.
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