If you are getting a straight 1100/1500, then you have probably lost power to the ICU. Power comes from the OVP relay, which is a red "ice cube," then via a silver "ice cube" that feeds both the ICU and the lambda unit. A quick test is to see if you have 12V between Pins 2 and 4 of the ICU's socket. If not, work your way back to the OVP.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe