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There is a bulletin released from Mercedes on the start error message with the Drive authorization module failing needing replaced.This is bulletin T-B-80.57/32 as shown below.
Date: February 7, 2005
Order No.: T-B-80.57/32
Model Year 2000 to 2005
Engine Will Not Start and Fault Message "Start Error" Appears in Instrument Cluster
If you receive customer reports in the above model vehicles of the engine not starting and the message "Start Error" appearing in the instrument cluster, the drive authorization module may need to be replaced.
The drive authorization module (FBM) listed in the Parts Information section below now contains modified software to correct this condition.
This occurs when circuit 15 is truncated after the engine control unit sends a drive authorization system inquiry to the drive authorization module. If circuit 15 is switched off during this inquiry or is interrupted before the drive authorization module can respond, the same variable code is again used for the next circuit 15 cycle, as the drive authorization module has saved the previous inquiry. This results in the engine not starting for this key cycle.
To resolve, remove the old FBM control unit as per WIS instruction AR54.21-P-1300GH and replace FBM control unit with part number listed in the parts information section below.
Step 6 of AR54.21-P-1300GH checks whether the vehicle can be started with all keys. Ensure that all keys are available prior to beginning this procedure.
This module is located under the dash on the drivers side inserted into another control unit.Usually it can be seen once the new one is obtained, after removing the paneling above the brake and gas pedal to be removed and replaced.
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