Most likely the button for this adjustment is bad. Applying a bit more pressure might solve the problem. It's can also be confirmed by checking the actual values of the driver's door control unit with diagnostic computer. Also there is a separate seat adjustment control unit which can guide to the solution.
If the whole temperature and time displays are dark, the cause might lie in the burnt out illumination light bulbs of the instrument cluster, they can be replaced. But if some lcd lines are missing, the only cure is to replace the cluster. Unfortunately this is quite typical on MB clusters.
1st time using this. This response is of no benefit. I already no this much.
Without further checks with diagnstic computer i can only speculate what can be wrong with the seat because there are two control units, hall sensors and electric motor involved.
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