Moin moin, I drive a Mercedes SL R230 (BJ 2003) with which I have a problem since last summer. I charge the rear consumer battery (renewed last summer) permanently in winter with a CTEK MXS 5.0. So I got on today after the charger hanged the last 3-4 months on the battery and received the message “electric consumer switched off”. I had this message also last year already several times therefore the car comes now every time it comes into the garage comes to the charger that did not help. I was already in the workshop and had the battery measured through the battery is completely okay. I then found a trick and that is when I turn on the car and see the message I just turn off the ignition then turn on the ignition again and press directly the lever to open the top. The top can then be opened in 90% of cases sometimes it takes 2-3 attempts. If the top is open then I can a so I exclude the battery as a problem source because this also permanently depends on the charger I clamp it off and get the message. I get the message even with connected charger ! The opening of the doors via Keyless-Go works without any problems. So it seems as if the battery has enough voltage and the “car” detects simply too little. Where can the error source lie ? I have read once you can how does it work? I would like to check the voltage because I don’t have a multimeter to hand right now.