NigelCL
Member
Also sorry, when you say everything needs to be reset, is that something I can do with a simple code reader? Or is a trip to the Mercedes specialist required?The rear battery powers everything (other than starting) in the CL if the battery gets low, almost everything becomes glitchy and stops working, and all sorts of electrical warnings are displayed, and fault codes saved.
It's not easy to get at the rear battery, I remove mine to charge it and swap another in temporary, Make sure the battery is fully charged and holding, everything will start working correctly, but you will still have problems with windows, warning lights etc until everything is reset.