Hood and windows issue.

[Retroste]

Hi, my clk 320 W208 Convertible has an issue I need help for.
The switch for operating the hood is permanently lit and doesn't work. This also effects the windows which will not move up or down.
Disconnecting and reconnecting the battery will correct the issue, but on the next restart the problem will return.

 

[davidsl500]

Are you resetting the windows after you reconnect the battery?

 

[Retroste]

Are you resetting the windows after you reconnect the battery?

Yes, all the way down and hold all the way up and hold? Then everything works fine until the car is left over night, after which the hood switch lights up and the windows and roof become inoperable, until the the battery is disconnected again.

 

[Tony Dyson]

I wonder if your car battery may be losing some charge overnight and things stop working in the morning due to an undervoltage issue?

 

[Retroste]

I don't think so, it's only 18months old. I can leave the car for weeks with out starting and there's always plenty of power to whizz it up.

 

[Tony Dyson]

Well you know what thought did? never make assumptions when it comes to faultfinding, check it once then look for confirmation! My car used to start happily with a resting voltage of 12.2v which dropped right down to 7.6 ish while starting but I changed it prior to the harshest of weather with winter just around the corner, batteries can fail at any time for lot's of different reasons.