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Check your production date. On all 1997 MBs the authorization system is DAS X, an unauthorized start an a DAS X 210 will give you no fuel injection, but it will CRANK (on a 202 there is no crank, but you have a 210). This started 6/96 production, I assume since yours is a 1997 that the prod date should be after 6/96, but double-check.
I was asking if you were getting messages in the odometer area.
On this car, actually you get unauthorized signals via the red and green LEDs in the rear view mirror. I am not sure what the sequence would be, but should spell it out in the owners manual, or maybe someone else will chime in. But probably both will blink at the same time(this is my best guess) or might alternately blink red and green.
DAS X has a seperate module, once it is satisfied the key is correct it authorizes the ECM to start. So possible it is the DAS module but I wouldn't go replacing things without knowing diagnosing things, that's just stupid.
PS DAS X is an oddball one-year only DAS
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