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Discussion Starter · #1 ·
Hi... This issue is occurring on a 2012 UK Ampera but hopefully someone here has seen it or knows about it.

From time to time, on touching a touchscreen button (apparently along the bottom of the screen, eg driving tips, radio favourites), the Time/Date setting screen (in Time Set mode) is displayed. Thereafter, touching the screen produces a click but no on-screen buttons are functional and the screen cannot be changed by touching the screen.

Pressing a button on the center console dismisses the Time Set display and displays the correct screen, but touching the screen thereafter again causes the inoperative Time Set display to be shown. In this condition, while functions can be accessed and displayed via the console buttons, no functions that rely on touching the screen can be used (eg Energy Efficiency, charge setting screen).

The problem appears remedied by power-cycling the vehicle. The problem generally shows itself after driving for some time, but I have seen it come up after the vehicle has been powered for under 5 minutes.

As power-cycling the vehicle rectifies the issue albeit temporarily, I am assuming that an actual touchscreen hardware sensing grid failure is unlikely, but I can imagine for example that there might be bad controller RAM or similar.

Has anyone experienced this and/or know a remedy? If it was to happen once in a blue moon I wouldn't worry; however I have had this three times in the past 2-3 weeks and would like to address it while the vehicle is under warranty, or at least discover if it's a known issue.

Any observations gratefully received.

--R
 

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Discussion Starter · #4 ·
Thanks for the comments... today it showed a different symptom: on the Climate screen, all the functions appeared to work normally but the only part of the display that updated was the Climate % icon bottom left: all the other values remained the same even though they were not correct.

I am skeptical of the (previously noted) fault being a physical touchscreen failure, as in the fault condition you can touch the screen anywhere when the rogue Time Setting display is showing and you get a click - ie it has registered a touch - but nothing happens; and if there was a physical touchscreen grid failure you would not expect power cycling to fix it.

Not sure what type of touchscreen this unit has but it's easy to identify as you say.

The idea of the 12v battery being the issue is interesting. Obviously I can measure its voltage and investigate further. My money is currently on an aspect of the touchscreen device controller, perhaps bad RAM or logic, but the 12v battery is easy enough to check.

Thanks for the helpful comments, guys.
 
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