Instrument panel lights are off, and the car will not start?

2007 AUDI Q7
170,000 MILES • 4.2L • V8 • 4WD • AUTOMATIC
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MOHAMAD12764
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Firstly, I turned the key to the first click but in the second click the car made a voice for 2 seconds, but the engine won't work.
i checked the battery it was too low then i tried again but the same thing
happened.
When I tried for the third time i turned the key to the first click but no lights in
the dashboard turned on
then when I checked the battery again its level was 0.
I charged the car battery using a cable and it charged but still, the same
problem when I turn the key on the first click no light in the dashboard on all
the lights off and I can't open the windows, but the radio is on and i can open
the window using the key and I can control the car's main screen but the
screen on the Instrument panel is off.
Jun 13, 2024 at 3:38 PM
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JACOBANDNICKOLAS
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Hi,

I was always taught to start at the power source when there was an electrical issue. So, here is what I suggest to start: Remove the battery, fully charge it, and then take it to a parts store and have them load test it to make sure we don't have a bad cell inside the battery.

If you want, here is a load test you can try at home before taking it. This doesn't require any tools to perform.

https://www.2carpros.com/articles/car-battery-load-test

If you have already done this, let me know. Also, what did you mean by you heard a voice when trying to start it? Are you referring to the starter motor or something inside from the radio?

Let me know.

Joe
Jun 13, 2024 at 8:45 PM
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MOHAMAD12764
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thank you for your advice , I will try that and the sound it is like every day when you turn on the engine but here it won't turn on.
Jun 14, 2024 at 2:28 AM
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MOHAMAD12764
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but if the problem is in the battery why I can open the windows by the key, but I can't open it with the button in the car and why the screen for the radio is turned on and I can check the battery level by it but no lights in the dashboard.
Jun 14, 2024 at 2:36 AM
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STRAILER
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The battery sounds bad to me, how many years old is it? How did it do on the load test guide?
Jun 14, 2024 at 6:43 PM
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MOHAMAD12764
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i don't know but it's too old and very weak.
Jun 15, 2024 at 6:49 AM
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STRAILER
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Let us know after you install a new battery, this guide can help:

https://www.2carpros.com/articles/how-to-replace-a-car-battery

Please go over this guide and get back to us.

Jun 15, 2024 at 10:56 AM