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Hello everybody.
I'm having an issue with my mercs instrument cluster clock. Every time after ~3-8hrs the ignition/car is turned off, the time and date on the instrument cluster keeps resetting and I can't find the solution for this issue. All the fuses are good, the battery is new, no errors/faults on the instrument cluster's display and every function on the cluster works well, except the clock and date keeps resetting each time, except if I turn on the ignition/car after ~2-3hrs. Has anyone had a similar experience with this problem and found a solution?
The car is 2007 w204, with the 4 button steering wheel, audio20 with this kind of instrument cluster shown in the picture:
Radio stations are kept, also the color scheme (day/night set manual) in center display are kept, so does language and heat settings.
Mileage (total), 0- 1000 and mpg also are kept. The only setting keeps resetting is clock and date. The date rolls back to year 2000 and the time goes to 00:00.
Every other functions/extras of the car work :/
You have audio 20 so I assume that you set the clock from the menu. Does your car have the Time Sync setting in the clock menu? If it is turned on, but there is no nearby station broadcasting a time signal, it may be resetting to the default time/date. The older ones had an internal battery or capacitor to hold enough charge to run the clock with the engine off, but I’m not sure how W204 handles that.
Clock can be set only on Instrument cluster. There's no such option in center console :/
Also, I removed the instrument cluster and gave to an electric. He checked it and everything seems fine, no visible issues were seen there. Also, checked the instrument cluster plug and voltage on pins, no issues there either, nothing unusual, but still the time keeps resetting after few hours. I keep wondering what is causing the clock to reset? The time is reset even when the car is just unlocked, without turning on the ignition.
One more thing I noticed is that while the instrument cluster was removed, the time on the audio20 screen (in the left top corner) also was gone but went back once the instrument cluster was put back.
Last edited by archibaldos; May 3, 2025 at 03:00 AM.
Clock can be set only on Instrument cluster. There's no such option in center console :/
Also, I removed the instrument cluster and gave to an electric. He checked it and everything seems fine, no visible issues were seen there. Also, checked the instrument cluster plug and voltage on pins, no issues there either, nothing unusual, but still the time keeps resetting after few hours. I keep wondering what is causing the clock to reset? The time is reset even when the car is just unlocked, without turning on the ignition.
One more thing I noticed is that while the instrument cluster was removed, the time on the audio20 screen (in the left top corner) also was gone but went back once the instrument cluster was put back.
In that case, your instrument cluster must work similar to the W203/W211. Try also posting in the W203 forum to see if there is a helpful reply. The W211 had an auxiliary battery, which you do not. It has been over 10 years since I have had either and no longer have any service info for them.
I also went to an indie workshop to do some diagnostics. Im not sure what kind of software was used but except errors about some interior bulbs everything else was fine
So I decided to try to install another instrument cluster from another car. Well, the clock and date still keeps reseting... :/
I don't have any other ideas left whats the problem :/
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