Hi, Recently purchasing a CLS 55 with a few niggly issues I have set about trying to fix them. a, Passenger side Dynamic seat not working. The light flickers in switch but won,t stay on, (light in switch has stayed on occasionally and initially diagnosed as dodgy switch or connection to it), so took the switch apart cleaned it, still no joy, swapped it with the driver's seat switch still not working and the passenger seat switch works ok in the driver's seat. Looking in the handbook it turns out you can switch the function on/off for each seat in the "settings" menu in the cluster, but this function doesn't seem to be in my cluster. b, Telephone steering wheel buttons not working with phone. Car came with the connector/cradle in the arm rest, so should already be activated in STAR. I bought a Viseoo MB-4, and none of the phone functions appear in the cluster, and as I said steering wheel buttons work though the pick up phone/put down phone button state function not available in the cluster when the button is pressed. c, Speed limit function in cluster not working. My understanding of this function from reading the handbook and from my previous AMG is that when activated and a limit speed selected it should illuminate the appropriate section on the outside of the speedo dial to indicate the selected limit speed, and it come up in the cluster as well. The limiter does actually work when tested just no indication of it in the cluster. d, Dynamic Headlight Curve light thingy (not sure exactly what its called) Is this able to be switched on/off? In the cluster? as I cannot get it working The cluster other than the above problems appears to be operating correctly in every other way. With all these issues it appears to me I seem to have a faulty cluster, or for some reason the cluster has lost some of its coding/programming. I have it booked in with PCS for a few little jobs later this week so will get it plugged into STAR to further investigate this issue. But in the mean time I thought about giving the car therefore the cluster a hard reset (reboot), but unsure of the exact procedure. I was going to disconnect both batteries, possibly even pull the fuse for the cluster, but unsure what to exactly do as in which battery do you disconnect/reconnect first etc. how long to leave it disconnected etc, if anyone can help, ideas as to what the problem could be it would be very much appreciated.