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S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

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Old Apr 24, 2017 | 12:48 PM
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Hi Guys
I just noticed when car is powered off the clock stops and as soon as power is on the clock syncs to the correct time, is this normal.
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Old Apr 24, 2017 | 09:43 PM
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That is the sign of a dying consumer/accessory battery in your trunk.
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Old Apr 25, 2017 | 01:21 PM
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Thanks for the info Dave, as the battery weakens more what other issues will I notice.
Last edited by 604benz; Apr 25, 2017 at 02:28 PM.
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Old Apr 25, 2017 | 03:53 PM
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actually i have seen this symptom just go away on its own.

it is usually the battery, but it might happen "just because".

as your battery weakens you will notice that that your abs/stability control systems become wonky and start throwing inop errors. same goes for keyless go and radio/nav head unit.

on a german car you really really want to keep the batteries in excellent shape. trust me.
Last edited by alx; Apr 25, 2017 at 03:56 PM.
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hi Johnm56

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