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S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

bad ISM or EIS

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Old 06-24-2024, 12:19 PM
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1994 S320 / 1984 300sd
bad ISM or EIS
Have been battling starting issue for awhile , if car is left unlocked - no issue , locking the car will cause the non starting issue - clock stopped at the time when possible faulty module shuts off , would not crank , no car milage displayed , solution is to disconnect the battery for 10 seconds .
Below are the fault codes from EIS and ISM modules.

Has anyone encountered similar problem?










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Old 06-24-2024, 02:11 PM
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S500
how about clear all faults.... get fault, check error, disconnect battery see which fault is no longer active
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