On my 2001 E55 the ABS, BAS and ESP lights all came on when I started the car and it says "Visit Workshop". The ABS pump was running constantly and continued to run after turning the car off. We had to unhook the connection to the solenoid pack that connects to the ABS pump to stop the unit from running.

Based on a few posts here and a Google search it appears that this is a somewhat common problem on the M Class. For the M Class the fix in some cases was to replace the ABS pump relay (K25). Another cause on the M Class based on modulemaster.com is a bad solenoid pack attached to the ABS unit. My E55 has a similar solenoid pack but does it have an ABS pump relay somewhere? If so, does anyone know where that is located or if you have solved a similar problem on a 210 series, how?