[Tom Manning]

After disconnecting the battery, you have to reset the windows. Hold both switches up for a few seconds until all four windows close fully.

It sounds like the rear battery is on the way out. Very strange things happen when the battery on the 230 goes palliative. Charge it up fully or replace it with the correct AGM type and see what happens. It sounds like the roof is functioning normally though.

 

[Tom Manning]

As mentioned, after disconnecting the battery, you have to reset the windows. Hold both switches up for a few seconds until all four windows close fully and see if the issue persists.

If the battery was new then it should charge up OK by just driving it, or charging it with an external charger. If it flattened in a few weeks then you might have excessive quiescent draw, which will need to be measured with a DC milliamp meter. See how you go first though with the roof issue.

If you use the car regularly then it should hold charge OK but most of us find we get the 'consumers offline' message after a couple of weeks sitting idle, without an external charger attached.

 

[Tom Manning]

Check the fluid level in the reservoir for the roof pump in the boot. There are arrows on the plastic tank. You might have a leak from one or more of the cylinders.