SL/R230: 2003 SL500 online manual from Mercedes
#1
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2000 W210 E55->2003 R230 SL500->2004 W211 E55->2007 997TT+2007 E63->2010 GLK350->2012 E550 4matic
#3
Get your hands on a Star Diagnosis computer and connect to the RVC controller. Check for fault codes. If there are codes, then let the software guide you through steps to troubleshoot; if no codes, then go into the actual values menu and evaluate for yourself the status of the inputs to the controller.