Here is the latest: Found that the ASR/ESP charge pump was seized. Took it apart and got it working on the bench. It appears it is NOT getting 12 v from the controller. I am only getting about 1 v from controller to pump. My question is, when you first turn the key on, should the controller supply 12 v to the pump or under what conditions should the controller be providing power to the charge pump. Before I condemn the controller, can someone help me out with this question? Thx

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Mercedes Fleet:
2004 CL600 Designo Espresso SPORT
2004 S600 Designo Espresso SPORT/Lorinser Pkg.
1999 S320
1988 300TE
1972 280SEL 4.5
Diesel Fleet:
2014 GL350 Blutec
1987 300SDL Blk/Blk 4 place seating #18 head
1987 300SDL Smk Slv/Burgangy #17 head
1986 300SDL Blk Pearl/Palomino #14 head w/ 280K
1984 Lincoln Mark VII Fact BMW Turbo Diesel