If you care to be educated of the MB antiftheft system I can send you some documents about it.

Your module could be shot and have shorted or something went inside.

there is a test program for the antitheft that only requires a DVOM. I can send you that as well.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)